CN100444525C - Digital baseband system and process for compensating for analog radio transmitter impairments - Google Patents
Digital baseband system and process for compensating for analog radio transmitter impairments Download PDFInfo
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- CN100444525C CN100444525C CNB2004800138976A CN200480013897A CN100444525C CN 100444525 C CN100444525 C CN 100444525C CN B2004800138976 A CNB2004800138976 A CN B2004800138976A CN 200480013897 A CN200480013897 A CN 200480013897A CN 100444525 C CN100444525 C CN 100444525C
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Abstract
In order to compensate for performance degradation caused by inferior low-cost analog radio component tolerances of an analog radio, a wireless communication transmitter employs a control process to implement numerous digital signal processing (DSP) techniques to compensate for deficiencies of such analog components so that modern specifications may be relaxed. By monitoring a plurality of parameters associated with the analog radio, such as temperature, bias current or the like, enhanced phase and amplitude compensation, as well as many other radio frequency (RF) parameters may be implemented.
Description
Technical field
The invention relates to the conveyer design of wireless communication system.Particularly, the invention relates to Digital Signal Processing (DSP) technology, use the infringement that the compensating analog radio transmitter is given birth to, such as: logical distortion frequently, carrier leak, amplitude inequality, phase place inequality or like that.
Background technology
For system designer, the transmit communications signals of existing wireless system framework can have quite severe restriction usually.In addition, this class wireless system framework can provide the communication link and the high running cost of low reliability usually, and the conformability of this class wireless system framework and other system component also can present low imperfectly.
In radio frequency (RF) section of the traditional low-cost radio transmitter with simulated assembly, radio frequency (RF) Signal Processing can be accompanied by the distortion of certain degree usually.This class distortion can comprise usually: carrier leak, phase place inequality, amplitude inequality or like that.The expensive assembly that have preferable distorted characteristic, can strengthen signal quality then may be ignored in the design phase, uses the cost that reduces final products.
Because the assembly cost of handling radio frequency (RF) analog signal is far above the assembly that uses Digital Signal Processing (DSP), so digital baseband system (DBB), comprise: the low-cost conveyer that low noise and minimum power require preferably can use Digital Signal Processing (DSP) technology as far as possible.
Summary of the invention
For the usefulness of the bad low-cost artificial antenna composition tolerance of compensating analog wireless transmission reduces, the radio communication conveyer is to utilize various Digital Signal Processing (DSP) technology of a kind of control program with enforcement compensating analog composition deficiency, and then the specification that conforms to current standards.Via temperature, drift current, suchlike supervision, the phase place of reinforcement and amplitude compensation, just can implement together with other various radio frequencies (RF) parameter.
In preferred embodiment, a kind of digital baseband of the present invention (DBB) conveyer or a kind of wireless transmission/reception single (WTRU), it has: an artificial antenna conveyer, one digital pre-distortion compensating module, one digital DC (DC) migration module, the uneven compensating module of one digital amplitude, the uneven compensating module of one digit phase, at least one digital analog converter (DAC), use the interface that forms these digital compensation modules and this artificial antenna conveyer, at least one controller, use with this artificial antenna conveyer and each these digital compensation modules and communicate, wherein, these digital compensation modules are radio frequency (RF) the parameter deficiencies of proofreading and correct this artificial antenna conveyer.
This digital baseband (DBB) conveyer can have more: a modulation demodulator, use producing homophase (I) and quadrature (Q) signal component that inputs to each these digital compensation modules, this digital analog converter (DAC), this artificial antenna conveyer.
This digital baseband (DBB) conveyer can have more: a low pass filter (LPF) is coupled to each this homophase (I) signal component and this quadrature (Q) signal component of this digital pre-distortion compensating module.This low pass filter (LPF) can be a rised cosine (RRC) filter.
This artificial antenna conveyer can have: a power amplifier, a modulator, a power detecting device, a temperature inductor, use the temperature reading, the drift current inductor that monitor this artificial antenna conveyer, use a drift current reading that monitors this artificial antenna conveyer.At least one these digital compensation modules can in response in this drift current inductor or this temperature inductor to activate.
This digital baseband (DBB) conveyer can have more: an internal memory, use storing plural number table look-up (LUT).In response in this temperature reading of this temperature inductor, these table look-up one of (LUT) table look-up is to select to be used for this digital pre-distortion compensating module.
This power amplifier may be inclined to a linear deficiency.This digital pre-distortion compensating module can be in response to the input power position standard of this power amplifier of detecting in this power detecting device, and, this selection the table look-up gain and the phase property of this power amplifier that (LUT) store, and then the phase place and the amplitude of this homophase of distortion (I) signal component and this quadrature (Q) signal component, use making this power amplifier can produce a linear response but not distortion response.
This modulator may be inclined to a carrier leak deficiency.One minimum detecting reading of each these signal inputs can determine.First and second direct current (DC) migration numerical value is can be in response to detecting readings with decision in these minimums.This digital DC (DC) migration module can be in response in these first and second direct current (DC) migration numerical value, and then it is accurate to eliminate the carrier leak of this modulator to adjust direct current (DC) position of these signals inputs.This modulator can have regional oscillator (LO) frequency, uses these minimum detecting readings of decision.
It is on average not enough that this modulator may be inclined to an amplitude.The uneven compensating module of this digital amplitude can be adjusted the power level of one of this homophase (I) signal component and this quadrature (Q) signal component signal component, uses making the power level of this homophase (I) signal component and this quadrature (Q) signal component identical.
This modulator may be inclined to a phase average deficiency.The uneven compensating module of this digit phase is the phase place that can adjust this homophase (I) signal component and this quadrature (Q) signal component, uses making the phase place of this homophase (I) signal component and this quadrature (Q) signal component orthogonal.
In sum, the invention provides a kind of digital baseband conveyer, it comprises: (A) artificial antenna conveyer that comprises temperature inductor; (B) plural digital compensation module; (C) internal memory is used the storage plural number and is tabled look-up; And (D) at least one controller, use with this artificial antenna conveyer and each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, this temperature inductor monitors a temperature reading relevant with this artificial antenna conveyer, and, in response in this temperature reading that this temperature inductor monitored, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, one of decision is relevant with each these signals input, and minimum is detected the power reading, first and second DC-offset compensation numerical value is inserted these minimum detecting power readings by Inner and is determined, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of wireless transmission/receive unit, and it comprises: (A) artificial antenna conveyer that comprises temperature inductor; (B) plural digital compensation module; (C) internal memory is used the storage plural number and is tabled look-up; And (D) at least one controller, use with this artificial antenna conveyer and each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, this temperature inductor monitors a temperature reading relevant with this artificial antenna conveyer, and, in response in this temperature reading that this temperature inductor monitored, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, one of decision is relevant with each these signals input, and minimum is detected the power reading, first and second DC-offset compensation numerical value is inserted these minimum detecting power readings by Inner and is determined, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of integrated circuit, inputs to a signal that comprises the artificial antenna conveyer of temperature inductor in order to processing, and this integrated circuit comprises: (A) plural digital compensation module; (B) internal memory is used the storage plural number and is tabled look-up; And (C) at least one controller, use with each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, and, in response in this temperature reading that this temperature inductor monitored, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this analogue radio transmissions utensil has a modulator of tendency one carrier leak deficiency with the relevant minimum detecting power reading of these signal inputs of decision and each, first and second DC-offset compensation numerical value is inserted these minimum detecting power readings by Inner and is determined, and this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of digital baseband conveyer, and it comprises: (A) artificial antenna conveyer, this artificial antenna conveyer have a modulator of tendency one carrier leak deficiency; (B) a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, wherein, the minimum detecting power reading that these signal inputs of decision and each are relevant, first and second DC-offset compensation numerical value is inserted these minimum detecting power readings by Inner and is determined, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of wireless transmission/receive unit, and it comprises: (A) artificial antenna conveyer, this artificial antenna conveyer have a modulator of tendency one carrier leak deficiency; (B) a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, wherein, the minimum detecting power reading that these signal inputs of decision and each are relevant, first and second DC-offset compensation numerical value is inserted these minimum detecting power readings by Inner and is determined, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
The present invention also provides a kind of integrated circuit, input to the signal of an artificial antenna conveyer in order to processing, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, this integrated circuit comprises: (A) digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, wherein, the minimum detecting power reading that these signal inputs of decision and each are relevant, first and second DC-offset compensation numerical value is inserted these minimum detecting power readings by Inner and is determined, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator; (B) at least one digital analog converter is in order to form the interface of these digital compensation modules and this analogue radio transmissions device.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is a kind of calcspar with conveyer of digital baseband (DBB) compensation processor of the preferred embodiment according to the present invention;
In Fig. 2 presentation graphs 1 digital baseband (DBB) compensation processor, the Organization Chart of each digital compensation module;
The Organization Chart of Fig. 3 presentation graphs 2 digital compensation modules;
The flow chart of the compensation for loss and damage control program of Fig. 4 presentation graphs 1 conveyer;
The Organization Chart of Fig. 5 presentation graphs 2 digital pre-distortion compensating modules;
The Organization Chart of Fig. 6 presentation graphs 2 digital DCs (DC) migration module;
The Organization Chart of the uneven compensating module of Fig. 7 presentation graphs 2 digital amplitudes; And
The Organization Chart of the uneven compensating module of Fig. 8 presentation graphs 2 digit phases.
Embodiment
The invention relates to a kind of digital baseband (DBB) conveyer, it can utilize the wireless composition of low usefulness and the low radio performance of compensating digits base band (DBB), uses the high-effect solution of radio frequency (RF) is diverted in digital baseband (DBB).Therefore, the present invention can promote low cost, low power consumption, low hardware complexity.And via the mutual optimization between radio frequency (RF) and digital baseband (DBB), the compensation of the usefulness of digital baseband (DBB) can also be in being limited by radio frequency (RF) feature of integrating with digital baseband (DBB).
The preferably, this digital baseband (DBB) conveyer is to be integrated in wireless transmission/receive unit (WTRU).In this article, wireless transmission/receive unit (WTRU) is including, but not limited to user's equipment (UE), mobile station, fixing or mobile subscriber unit, beeper, maybe can operate in any other types of devices of wireless environment.In addition, the feature of this digital baseband (DBB) conveyer can also be integrated in integrated circuit (IC), or the feature of this digital baseband (DBB) conveyer can also framework be the circuit with a large amount of interconnection compositions.
In addition, the present invention can also be applicable to and utilize time division duplex (TDD), frequency division duplexing (FDD), code division multiple access (CDMA), code division multiple access 2,000 (CDMA2000), the synchronous code division multiple access of timesharing (TDSCDMA), orthogonal frequency division multitask (OFDM) or suchlike communication system.
Fig. 1 represents the calcspar of a kind of digital baseband (DBB) conveyer 100.This digital baseband (DBB) conveyer 100 has a modulation demodulator 105, it is exported respectively has homophase (I) and quadrature (Q) signal component 110,115 digital signal and with these digital signals, via low pass filter (LPF) 120,125, be sent to digital baseband (DBB) compensation processor 130 and digital analog converter (DAC) circuit 135, use exporting analog signal to artificial antenna conveyer 150.Low pass filter (LPF) 120,125 can be root rised cosine (RRC) filter or other suitable filter.This digital analog converter (DAC) circuit 135 has digital analog converter (DAC) 140,145.
This digital baseband (DBB) conveyer 100 has more a controller 155, and it carries out this digital baseband (DBB) compensation processor 130 and all initiatively control of composition maintenances of this artificial antenna conveyer 150.In addition, this controller 155 is to control (TPC) signal by the through-put power that base station or other entity receive by this modulation demodulator 105 of access, and in view of the above, this controller 150 just can be carried out and calculate or other function.
This artificial antenna conveyer 150 has an antenna 160, a power amplifier 165, a modulator 170, a power detecting device 175, monitors a temperature inductor 180 of artificial antenna conveyer 150 temperature, measures one of artificial antenna conveyer 150 drift currents drift current inductor 185.The composition of artificial antenna conveyer 150 is become to be grouped into by the low cost (" low-quality ") of the specification that conforms to current standards.For instance, because the pre-distortion compensated module of this digital baseband (DBB) compensation processor 130, the specification of this power amplifier 165 does not need very strict.
Please refer to Fig. 2, digital baseband (DBB) compensation processor 130 has at least one module of following modules, uses the usefulness of strengthening this artificial antenna conveyer 150, and it comprises:
(1) the digital pre-distortion compensating module 205;
(2) digital DC (DC) migration module 210;
(3) the uneven compensating module 215 of digital amplitude; And
(4) the uneven compensating module 220 of digit phase.
This digital pre-distortion compensating module 205 can be used for proofreading and correct the transmission amplitude characteristic, such as: amplitude modulation (AM) signal characteristic to amplitude modulation (AM) and amplitude modulation (AM) to phase modulation (PM).In this artificial antenna conveyer 150, the amplitude of power amplifier 165 and phase property be utilize the statistical sampling method or according to power detecting device 175 manufacturer's specifications with the decision.This digital pre-distortion compensating module 205 is in response in the through-put power control (TPC) of received signal input and 105 receptions of modulation demodulator, uses the power of the antenna 160 of this artificial antenna conveyer 150 of prediction.Known gain and phase property based on this power amplifier 165, this digital pre-distortion compensating module 205 is the painstakingly phase place and the amplitude of distortion homophase (I) and quadrature (Q) signal component just, uses making this power amplifier 165 produce linear responses but not the distortion response.This digital pre-distortion compensating module 205 can also be used the counter-rotating that obtains this class A amplifier A feature with reference to tabling look-up (LUT) or like that.Preferred embodiment of the present invention is favourable relatively, because: even using cheaply, this artificial antenna conveyer 150 reaches inferior composition (for instance, hang down the amplifier of power output limit), and radio frequency (RF) parameter and standard (such as: the intermodulation distortion) can also obtain to satisfy.
This digital DC (DC) migration module 210 can be based on first and second direct current (DC) migration numerical value of previous decision (that is: store), and it is accurate to proofread and correct the carrier leak of (that is: constrain) this artificial antenna conveyer 150 to adjust direct current (DC) position of these homophases (I) and quadrature (Q) signal component.Determine these direct currents (DC) migration numerical value, homophase (I) of this digital baseband (DBB) and quadrature (Q) signal component input 110,115 must switch to controller 155 (diverter switch is not shown among the figure) by modulation demodulator 105.This controller 155 can scan these homophases (I) and quadrature (Q) signal component input 110 respectively, 115 direct current (DC) position accurate (for instance: by negative in regular turn to just or by just in regular turn to negative), simultaneously, this power detecting device 175 can determine each first and second minimum to detect reading with regional oscillator (LO) frequency of modulator 170.(for instance, this controller 155 not sweep signal composition input is set at zero, uses that it is closed) then can be temporarily interrupted in the signal component input that does not scan at present.
First and second direct current (DC) migration numerical value (that is: compensating factor K1 and K2) be that first and second minimum detecting reading of interpolation is to obtain.Subsequently, first and second direct current (DC) migration numerical value can store for following reference, by this, the input of these homophases (I) and quadrature (Q) signal component just can be respectively in response in first and second direct current (DC) migration numerical value to adjust.
In another kind of preferred embodiment, this controller 155 can cooperate detecting algorithm and this power detecting device 175 to use.This controller 155 is direct current (DC) the position standards that scan each homophase (I) and the input of quadrature (Q) signal component simultaneously.This detecting algorithm is to utilize coordinate system to use at least one minimum detecting reading of decision, by this, direct current (DC) the position standard of each homophase (I) and the input of quadrature (Q) signal component just can put on X-axis and Y-axis, simultaneously, the detecting reading of these power detecting device 175 inductions can also be applied to the Z axle.
The uneven compensating module 215 of this digital amplitude can be used for average these homophases (I) and quadrature (Q) signal component, uses the modulator 170 that makes this artificial antenna conveyer 150 and can utilize equal-wattage position these homophases of accurate modulation (I) and the input of quadrature (Q) signal component.Suppose that this modulator 170 is cheap and low-quality, then this modulator 170 is to tend on average deficiency of amplitude.For instance, if the input of this homophase (I) signal component is imported little 1.0dB than this quadrature (Q) signal component, then the uneven compensating module 215 of this digital amplitude just can make the power level of this quadrature (Q) signal component input reduce 1.0dB.So, the output of this modulator 170, that is: these homophases (I) and the input of quadrature (Q) signal component just can have same-amplitude.Utilize this controller 155, these homophases (I) and the input of quadrature (Q) signal component just can be distinguished switch.For instance, if this controller 155 cuts out the input of this quadrature (Q) signal component, then only have the input of this homophase (I) signal component to be sent out, and this controller 155 just can determine the power level that the power detecting device 175 of this artificial antenna conveyer 150 reads.Suppose that this power level is desirable target bit standard, then the input of this homophase (I) signal component just can be closed, and the input of this quadrature (Q) signal component can be opened once again.The uneven compensating module 215 of this digital amplitude can be adjusted the power level of this quadrature (Q) signal component input, use the equal-wattage position standard that makes the power detecting device can read these homophases (I) and quadrature (Q) signal component simultaneously to import (that is: desirable target bit standard).
In addition, this modulator 170 also can tend to the phase average deficiency.The uneven compensating module 220 of this digit phase can be used for the phase place of average these homophases (I) and quadrature (Q) signal component.These homophases (I) and the input of quadrature (Q) signal component are to activate simultaneously, and, the power level of these homophases (I) and quadrature (Q) signal component input is to reduce 3dB (that is: cut half, use the target power position standard that the power level that this power detecting device 175 is measured only equals one of these homophases (I) and the input of quadrature (Q) signal component signal component input) respectively.This program is to be used for setting up reference power position standard, uses with the measurement of this power detecting device 175 and compares.Equal the dreamboat power level if reference power position standard and power inductor 175 measure the difference of power level at present, then the input of these homophases (I) and quadrature (Q) signal component is a quadrature, and by this, real number and imaginary signal partly are to have phase quadrature.In response in the power level reading of the power detecting device 175 of artificial antenna conveyer 150, these homophases (I) and the input of quadrature (Q) signal component be expression less than phase quadrature: the readout power position standard of this power detecting device 175 is greater than target power position standard.In addition, the input of these homophases (I) and quadrature (Q) signal component is big is expression in phase quadrature: the readout power position standard of this power detecting device 175 is less than target power position standard.Therefore, the uneven adjusting module 220 of this digit phase is to use and to carry out the phase place adjustment in response to differing that the difference between target power position standard and power detecting device 175 readout power position standards is derived.
The digital adjusting module of this digital baseband (DBB) compensation processor 130 can design according to various frameworks.Yet, it should be noted that low pass filter (LPF) 120,125 must be placed on this digital pre-distortion compensating module 205 fronts.Fig. 3 is in expression digital baseband (DBB) compensation processor 130, the preferable enforcement framework 300 of each module.
Fig. 4 is the steps flow chart of the compensation for loss and damage program 400 of expression a kind of digital baseband (DBB) conveyer 100.In step 405, open the beginning flag and be set at one, use this compensation for loss and damage program 400 of expression and begun.In step 410, select the communication pattern of wanting.Communication pattern can be time division duplex (TDD), frequency division duplexing (FDD) or any other communication pattern, such as: the synchronous code division multiple access of timesharing (TDSCDMA), orthogonal frequency division multitask (OFDM), code division multiple access 2,000 (CDMA2000) or like that.
In step 415,, then activate time division duplex (TDD) pattern if select time division duplex (TDD) pattern.In step 420,, then activate frequency division duplexing (FDD) pattern if select frequency division duplexing (FDD) pattern.In step 425,, then activate other communication pattern if select other communication pattern.In step 430, utilize the offset conditions of drift current inductor 185 these artificial antenna conveyers 150 of supervision, its expression: for instance, the electric current that power amplifier 165 extracts.
In step 435, utilize temperature inductor 180 to monitor the temperature of this artificial antenna conveyer 150 (or selection component).In step 440, read open the beginning flag with determine whether this program has been finished at least one cycle (that is: step 445,450,455).Be set at one open the beginning flag, as described in step 405, be expression: do not finish at least one cycle as yet.If open the beginning flag, in step 440, be set at one, then step 445 can be based on the temperature of temperature inductor 180 supervision and/or the drift current of drift current inductor 185 measurements, table look-up by the plural number of the internal memory 190 of tabling look-up and to select one in (LUT) and table look-up, use the pre-distortion compensated parameter of setting this digital pre-distortion compensating module.
The amplitude of this power amplifier 165 or phase change (such as this power detecting device 175 supervision) or the program person of digital baseband (DBB) conveyer 100 and/or any other parameter that the designer wants to monitor all can utilize, use by selecting one in this (LUT) internal memory 190 of tabling look-up and table look-up.This (LUT) internal memory 190 of tabling look-up can be positioned over this digital pre-distortion compensating module 205, this controller 155 or this digital baseband (DBB) conveyer 100 Anywhere.
In step 450, utilize this digital DC (DC) migration module 210 constrain the carrier leak of these homophases (I) and the input of quadrature (Q) signal component (that is: direct current (DC) position standard).In step 455, utilize the amplitude and the phase place inequality of uneven compensating module 220 compensation these homophases (I) of the uneven compensating module 215 of this digital amplitude and this digit phase and the input of quadrature (Q) signal component, as discussed previously.
After this compensation for loss and damage program 400 is finished one-period, that is: when completing steps 455, this opens the beginning flag, in step 460, can be set at zero, and, this compensation for loss and damage program 400 can be returned step 430 again, if step 465 is found the marked change of drift current and/or temperature, that is: the various parametric compensations of this artificial antenna conveyer 150 repeated, as described in step 445,450,455.
When opening this digital baseband (DBB) conveyer 100, we can imagine: whole digital compensation modules of digital baseband (DBB) compensation processor 130 are before beginning communication, with whole parameter optimizations of this artificial antenna conveyer 150.After communication beginning, the particular module of these digital compensation modules 205,210,215,220 then can be periodically, continuously or in response to requiring to implement in particular event or user.For instance, if detecting temperature, the temperature inductor 180 of this artificial antenna conveyer 150 rises (for instance, 5 degree rise), then at least one digital compensation module of these digital compensation modules 205,210,215,220 just may activate to compensate.
Fig. 5 is the preferred architecture figure of this pre-distortion compensated module 205 of expression, and it has: power prediction unit 505, multiplexer 510,515,520,525,530, adder 535,540,545,550, (LUT) 555 that table look-up, phase compensation unit 560.These homophases (I) and the input of quadrature (Q) signal component are to utilize power prediction unit 505 to receive, and using power prediction is I
2+ Q
2Output (the I of this power prediction unit 505
2+ Q
2) can utilize multiplier 510 to be multiplied by through-put power control (TPC), and the product that this power prediction unit 505 obtains can input to (LUT) 555 that table look-up, and using provides the amplitude modulation of these artificial antenna conveyer 150 deficiencies (AM) to amplitude modulation (AM) to compensate.Through-put power control (TPC) can be controlled the power output of this artificial antenna conveyer 150, and it can be expressed as: (I
2+ Q
2) * (TPC).This (LUT) 555 that table look-up provides radio frequency (RF) feature of this power amplifier 165 and/or these artificial antenna conveyer 150 other compositions, uses the deficiency that makes this power amplifier 165 (such as: imperfect gain compression and cause the dynamic range feature of antenna 160 non-linear radio frequencies (RF) output) and can eliminate fully.The output meeting of this (LUT) 555 that table look-up is multiplied by input of homophase (I) signal component and the input of quadrature (Q) signal component respectively via multiplexer 515 and 520.Therefore, the amplitude characteristic of these homophases (I) and quadrature (Q) signal component input (LUT) 555 that just can table look-up according to this uses the distortion amplitude characteristic of this artificial antenna conveyer 150 of compensation.
Continue, please refer to Fig. 5, product (I
2+ Q
2) and the product of through-put power control (TPC) also can input to phase compensation unit 560, using provides the amplitude modulation of these artificial antenna conveyer 150 deficiencies (AM) to phase modulation (PM) to compensate.This phase compensation unit 560, it cooperates multiplexer 525,530 and adder 545550 operations, can adjust differing of these homophases (I) and quadrature (Q) signal component input, use the phase place that makes the input of these homophases (I) and quadrature (Q) signal component orthogonal (that is: real number and imaginary signal partly have phase quadrature).
Fig. 6 is the preferred architecture figure of expression this digital DC (DC) migration module 210, and it has: adder 605 and 610.Compensating factor K
1And K
2Be to add these homophases (I) and the input of quadrature (Q) signal component respectively, use the imperfect direct current of deletion (DC) skew and eliminate carrier leak.
Fig. 7 is the preferred architecture figure of the uneven compensating module 215 of this digital amplitude of expression, and it has: multiplier 705 and adder 710.Compensating factor K
1Be to utilize multiplier 705 to be multiplied by the input of quadrature (Q) signal component, and, obtaining product is to utilize adder 710 to add the input of quadrature (Q) signal component, and by this, the power level of this quadrature (Q) signal component input just can be adjusted to the identical bits standard of this homophase (I) signal component input.The purpose that it should be noted that this multiplier 705 only be for avoid this quadrature (Q) signal component input do not expect interruption (that is: compensating factor K
1=0 situation).Perhaps, the framework of multiplier 705 and adder 710 can also cooperate the input of this homophase (I) signal component, or, cooperate the input of these homophases (I) and quadrature (Q) signal component simultaneously.
Fig. 8 is the preferred architecture figure of the uneven compensating module 220 of this digit phase of expression, and it has: adder 805,810 and multiplier 815,820.In response in the not orthogonal phase error 825 of phase place of these homophases (I) and the input of quadrature (Q) signal component, the phase place of these homophases (I) and the input of quadrature (Q) signal component just can be adjusted.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, under the situation that does not break away from spirit of the present invention, also can make the variation or the replacement of various equivalences, therefore, as long as in connotation scope of the present invention in the scope to the variation of the foregoing description, claims that modification all will drop on the application.
Claims (34)
1. a digital baseband conveyer is characterized in that, comprising:
(A) an artificial antenna conveyer that comprises temperature inductor;
(B) plural digital compensation module;
(C) internal memory is used the storage plural number and is tabled look-up; And
(D) at least one controller, use with this artificial antenna conveyer and each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, this temperature inductor monitors a temperature reading relevant with this artificial antenna conveyer, and, in response in this temperature reading that this temperature inductor monitored, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, one of decision is relevant with each these signals input, and minimum is detected the power reading, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
2. digital baseband conveyer as claimed in claim 1 is characterized in that, this artificial antenna conveyer also comprises:
(i) power amplifier;
A (ii) modulator; And
A (iii) power detecting device.
3. digital baseband conveyer as claimed in claim 1, it is characterized in that, this artificial antenna conveyer also comprises a drift current inductor, in order to monitor a drift current reading relevant with this artificial antenna conveyer, and at least one these digital compensation modules are in response to activating in this drift current inductor.
4. digital baseband conveyer as claimed in claim 1, it is characterized in that, these digital compensation modules have a digital pre-distortion compensating module, this digital pre-distortion compensating module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this power amplifier tendency one is linear not enough, and, this digital pre-distortion compensating module is based on the gain and the phase property of this stored in the tabling look-up of this selection power amplifier, and then the phase place and the amplitude of this in-phase signal composition of distortion and this orthogonal signalling composition, use making this power amplifier produce a linear response, but not distortion response.
5. digital baseband conveyer as claimed in claim 1, it is characterized in that, these digital compensation modules have a digital pre-distortion compensating module, this digital pre-distortion compensating module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, and this digital baseband conveyer also comprises:
(E) low pass filter is coupled to respectively this in-phase signal input and the input of this orthogonal signalling of this digital pre-distortion compensating module; And
(F) at least one digital analog converter is used the interface that forms these digital compensation modules and this artificial antenna conveyer.
6. digital baseband conveyer as claimed in claim 5 is characterized in that, this low pass filter is a rised cosine filter.
7. digital baseband conveyer as claimed in claim 1 is characterized in that, this modulator has a regional oscillator frequency, uses these minimum detecting power readings of decision.
8. digital baseband conveyer as claimed in claim 1, it is characterized in that, these digital compensation modules have the uneven compensating module of a digital amplitude, the uneven compensating module of this digital amplitude has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this artificial antenna conveyer has one of the average deficiency of tendency one amplitude modulator, and, the uneven compensating module of this digital amplitude is to adjust one of them power level of this in-phase signal composition and this orthogonal signalling composition, uses to make this in-phase signal composition respectively and respectively the power level of this orthogonal signalling composition is identical.
9. digital baseband conveyer as claimed in claim 1, it is characterized in that, these digital compensation modules have the uneven compensating module of a digit phase, the uneven compensating module of this digit phase has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this artificial antenna conveyer has a modulator of tendency one phase average deficiency, and, the uneven compensating module of this digit phase is adjusted the phase place of this in-phase signal composition and this orthogonal signalling composition, uses to make this in-phase signal composition respectively and respectively the phase place of this orthogonal signalling composition is orthogonal.
10. digital baseband conveyer as claimed in claim 1 is characterized in that, also comprises:
(E) a modulation demodulator uses producing homophase and the orthogonal signalling composition that inputs to each these digital compensation module and this artificial antenna conveyer.
11. a wireless transmission/receive unit is characterized in that, comprising:
(A) an artificial antenna conveyer that comprises temperature inductor;
(B) plural digital compensation module;
(C) internal memory is used the storage plural number and is tabled look-up; And
(D) at least one controller, use with this artificial antenna conveyer and each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, this temperature inductor monitors a temperature reading relevant with this artificial antenna conveyer, and, in response in this temperature reading that this temperature inductor monitored, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, one of decision is relevant with each these signals input, and minimum is detected the power reading, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
12. wireless transmission/receive unit as claimed in claim 11 is characterized in that, this artificial antenna conveyer also comprises:
(i) power amplifier;
A (ii) modulator; And
A (iii) power detecting device.
13. wireless transmission/receive unit as claimed in claim 11, it is characterized in that, this artificial antenna conveyer also comprises a drift current inductor, in order to monitor a drift current reading relevant with this artificial antenna conveyer, and at least one these digital compensation modules are to activate in response to this drift current inductor.
14. wireless transmission/receive unit as claimed in claim 11, wherein, these digital compensation modules have a digital pre-distortion compensating module, this digital pre-distortion compensating module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this power amplifier is that tendency one is linear not enough, and, this digital pre-distortion compensating module is based on the gain and the phase property of this stored in the tabling look-up of this selection power amplifier, and then the phase place and the amplitude of this in-phase signal composition of distortion and this orthogonal signalling composition, use making this power amplifier produce a linear response, but not distortion response.
15. wireless transmission/receive unit as claimed in claim 11, wherein, these digital compensation modules have a digital pre-distortion compensating module, this digital pre-distortion compensating module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, and this wireless transmission/receive unit also comprises:
(E) low pass filter is coupled to respectively this in-phase signal input and the input of this orthogonal signalling of this digital pre-distortion compensating module; And
(F) at least one digital analog converter is used the interface that forms these digital compensation modules and this artificial antenna conveyer.
16. wireless transmission/receive unit as claimed in claim 15, wherein, this low pass filter is a rised cosine filter.
17. wireless transmission/receive unit as claimed in claim 11, wherein, this modulator has a regional oscillator frequency, uses these minimum detecting power readings of decision.
18. wireless transmission/receive unit as claimed in claim 11, it is characterized in that, these digital compensation modules have the uneven compensating module of a digital amplitude, the uneven compensating module of this digital amplitude has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this artificial antenna conveyer has the average not enough modulator of tendency one amplitude, and, the uneven compensating module of this digital amplitude is to adjust one of them power level of this in-phase signal composition and this orthogonal signalling composition, uses to make this in-phase signal composition respectively and respectively the power level of this orthogonal signalling composition is identical.
19. wireless transmission/receive unit as claimed in claim 11, it is characterized in that, these digital compensation modules have the uneven compensating module of a digit phase, the uneven compensating module of this digit phase has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this artificial antenna conveyer has a modulator of tendency one phase average deficiency, and, the uneven compensating module of this digit phase is a phase place of adjusting this in-phase signal composition and this orthogonal signalling composition, uses to make this in-phase signal composition respectively and respectively the phase place of this orthogonal signalling composition is orthogonal.
20. wireless transmission/receive unit as claimed in claim 11 is characterized in that, also comprises:
(E) a modulation demodulator uses producing homophase and the orthogonal signalling composition that inputs to each these digital compensation module and this artificial antenna conveyer.
21. an integrated circuit inputs to a signal that comprises the artificial antenna conveyer of temperature inductor in order to processing, it is characterized in that this integrated circuit comprises:
(A) plural digital compensation module;
(B) internal memory is used the storage plural number and is tabled look-up; And
(C) at least one controller, use with each these digital compensation module and communicate, wherein, these digital compensation modules are the radio frequency parameter deficiencies of proofreading and correct this artificial antenna conveyer, and, in response in this temperature reading that this temperature inductor monitored, these specific tabling look-up of tabling look-up are selected to be used at least one this digital compensation module from this internal memory with setup parameter, and, these digital compensation modules have a digital DC migration module, this digital DC migration module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this analogue radio transmissions utensil has a modulator of tendency one carrier leak deficiency with the relevant minimum detecting power reading of these signal inputs of decision and each, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
22. integrated circuit as claimed in claim 21, it is characterized in that, this digital compensation module comprises a digital pre-distortion compensating module, this digital pre-distortion compensating module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, and, this digital pre-distortion compensating module is based on this selection stored information of tabling look-up, and then the phase place and the amplitude of this in-phase signal composition of distortion and this orthogonal signalling composition, uses at least one radio frequency features of improving this artificial antenna conveyer.
23. integrated circuit as claimed in claim 21, it is characterized in that, these digital compensation modules have a digital pre-distortion compensating module, this digital pre-distortion compensating module has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, it is characterized in that this integrated circuit also comprises:
(D) low pass filter is coupled to respectively this homophase input and the input of this quadrature of this digital pre-distortion compensating module;
(E) at least one digital analog converter is in order to form the interface of these digital compensation modules and this analogue radio transmissions device.
24. integrated circuit as claimed in claim 23 is characterized in that, respectively this low pass filter is a rised cosine filter.
25. integrated circuit as claimed in claim 21 is characterized in that, this modulator has a regional oscillator frequency, uses these minimum detecting power readings of decision.
26. integrated circuit as claimed in claim 21, it is characterized in that, these digital compensation modules have the uneven compensating module of a digital amplitude, the uneven compensating module of this digital amplitude has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this artificial antenna conveyer has the average not enough modulator of tendency one amplitude, and, the uneven compensating module of this digital amplitude is to adjust one of them power level of this in-phase signal composition and this orthogonal signalling composition, uses to make this in-phase signal composition respectively and respectively the power level of this orthogonal signalling composition is identical.
27. integrated circuit as claimed in claim 21, it is characterized in that, these digital compensation modules have the uneven compensating module of a digit phase, the uneven compensating module of this digit phase has the two signals input that comprises an in-phase signal composition and an orthogonal signalling composition, this artificial antenna conveyer has a modulator of tendency one phase average deficiency, and, the uneven compensating module of this digit phase is to adjust respectively this in-phase signal composition and the respectively phase place of this orthogonal signalling composition, uses making the phase place of this in-phase signal composition and this orthogonal signalling composition orthogonal.
28. integrated circuit as claimed in claim 21 is characterized in that, also comprises:
(E) a modulation demodulator uses producing homophase and the orthogonal signalling composition that inputs to each these digital compensation module.
29. a digital baseband conveyer is characterized in that, comprising:
(A) an artificial antenna conveyer, this artificial antenna conveyer have a modulator of tendency one carrier leak deficiency;
(B) a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, wherein, the minimum detecting power reading that these signal inputs of decision and each are relevant, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
30. digital baseband conveyer as claimed in claim 29 is characterized in that, this modulator has a regional oscillator frequency, uses these minimum detecting power readings of decision.
31. a wireless transmission/receive unit is characterized in that, comprising:
(A) an artificial antenna conveyer, this artificial antenna conveyer have a modulator of tendency one carrier leak deficiency;
(B) a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, wherein, the minimum detecting power reading that these signal inputs of decision and each are relevant, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator.
32. wireless transmission/receive unit as claimed in claim 31 is characterized in that, this modulator has a regional oscillator frequency, uses these minimum detecting power readings of decision.
33. an integrated circuit inputs to the signal of an artificial antenna conveyer in order to processing, this artificial antenna conveyer has a modulator of tendency one carrier leak deficiency, it is characterized in that this integrated circuit comprises:
(A) a digital DC migration module, this digital DC migration module has two signals that comprise an in-phase signal composition and an orthogonal signalling composition and imports, wherein, the minimum detecting power reading that these signal inputs of decision and each are relevant, first and second DC-offset compensation numerical value determines by these minimum detecting power readings of interpolation, and, this digital DC migration module is based on these first and second DC-offset compensation numerical value, and then the direct current position standard separately of adjusting the input of this two signal is to eliminate the carrier leak relevant with this modulator;
(B) at least one digital analog converter is in order to form the interface of these digital compensation modules and this analogue radio transmissions device.
34. integrated circuit as claimed in claim 33 is characterized in that, this modulator has a regional oscillator frequency, uses these minimum detecting power readings of decision.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47631403P | 2003-06-06 | 2003-06-06 | |
| US60/476,314 | 2003-06-06 | ||
| US10/736,294 | 2003-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101863313A Division CN101436868B (en) | 2003-06-06 | 2004-05-10 | Digital baseband system for compensating for analog radio transmitter impairments |
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| Publication Number | Publication Date |
|---|---|
| CN1809967A CN1809967A (en) | 2006-07-26 |
| CN100444525C true CN100444525C (en) | 2008-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2004800138976A Expired - Fee Related CN100444525C (en) | 2003-06-06 | 2004-05-10 | Digital baseband system and process for compensating for analog radio transmitter impairments |
| CN2008101863313A Expired - Fee Related CN101436868B (en) | 2003-06-06 | 2004-05-10 | Digital baseband system for compensating for analog radio transmitter impairments |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008101863313A Expired - Fee Related CN101436868B (en) | 2003-06-06 | 2004-05-10 | Digital baseband system for compensating for analog radio transmitter impairments |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103975564A (en) * | 2011-10-27 | 2014-08-06 | Lsi公司 | Processor having instruction set with user-defined non-linear functions for digital pre-distortion (DPD) and other non-linear applications |
| CN102938650A (en) * | 2012-11-09 | 2013-02-20 | 华为技术有限公司 | Signal compensation method, serializer and deserializer |
| US8855588B2 (en) * | 2012-12-19 | 2014-10-07 | Mstar Semiconductor, Inc. | Power amplifying apparatus and wireless signal transmitter utilizing the same |
| CN105162459B (en) * | 2015-09-08 | 2018-06-29 | 四川九洲电器集团有限责任公司 | A kind of power calibrating method and system of DDS wideband signal sources |
| CN105515533A (en) * | 2015-11-12 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Digital IQ real-time compensation method based on look-up table |
| US11177847B2 (en) * | 2019-03-22 | 2021-11-16 | Mediatek Singapore Pte. Ltd. | Method for compensating for degradation of signal during transmission of the signal and transmitter utilizing the same |
| CN110943748B (en) * | 2019-11-08 | 2022-04-12 | 芯原微电子(上海)股份有限公司 | Automatic mismatch calibration circuit, radio frequency receiver system and method |
| CN111162782B (en) * | 2019-12-31 | 2021-09-21 | 京信网络系统股份有限公司 | Direct current calibration method, system, device and storage medium |
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| US6169463B1 (en) * | 1999-03-24 | 2001-01-02 | Philips Electronic North America Corp. | Quadrature modulator with set-and-forget carrier leakage compensation |
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| US6313703B1 (en) * | 1998-06-19 | 2001-11-06 | Datum Telegraphic, Inc | Use of antiphase signals for predistortion training within an amplifier system |
| CN1359562A (en) * | 1999-02-22 | 2002-07-17 | 艾利森电话股份有限公司 | Radlo receiver and method for preloading an average dc-offset into a channel filter |
| US6169463B1 (en) * | 1999-03-24 | 2001-01-02 | Philips Electronic North America Corp. | Quadrature modulator with set-and-forget carrier leakage compensation |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101436868B (en) | 2013-03-27 |
| CN101436868A (en) | 2009-05-20 |
| CN1809967A (en) | 2006-07-26 |
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