CN101350661A - Multi-channel digital frequency-selecting technology - Google Patents
Multi-channel digital frequency-selecting technology Download PDFInfo
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- CN101350661A CN101350661A CNA2008100424982A CN200810042498A CN101350661A CN 101350661 A CN101350661 A CN 101350661A CN A2008100424982 A CNA2008100424982 A CN A2008100424982A CN 200810042498 A CN200810042498 A CN 200810042498A CN 101350661 A CN101350661 A CN 101350661A
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Abstract
The present invention relates to a multi-channel digital frequency-selecting technology. A digital frequency-selecting module consists of an input/output processing unit, an analog-digital/digital-analog conversion unit, a master clock unit, and a digital medium-frequency processing unit. After the input signals are processed by the input processing unit, the analog-digital conversion unit of field programmable gate array FPGA converts analog signals into digital signals; the FPGA calculates and processes the data of the converted digital signals, to complete the digital selection and digital filtering of each channel and further to acquire the data of each channel. A digital frequency-selecting filter is used for filtering and selecting the data; the acquired digital signals of each channel are transformed into the analog signals, and are transmitted outwards after being processed by the output processing unit. The functions of each channel are realized under the control of the master clock unit and the main control unit of module. The technology has the functions of protecting the excessive power, inhibiting the uplink noise, and providing the summarized telephone traffic of the uplink, and can be massively used in the field of base station of mobile communication, and so on.
Description
Technical field
The invention belongs to the communications field, be specifically related to digital high-frequency amplification station multi-channel digital frequency-selecting technology in the moving communicating field.
Background technology
The raising of the fast development of mobile communication, mobile subscriber's rapid growth and single user's telephone traffic has brought the problem of an instant increase-volume to operator.Then by improving the availability of frequency spectrum, the increase capacity solves above problem on existing network in operator.
The repeater belongs to the frequency multiplying arrangement, is to play a kind of radio transmission transferring equipment that signal is strengthened in the wireless communication transmissions process, and its basic function is exactly a radiofrequency signal power intensifier.The repeater obtains signal by donor antenna from existing overlay area in down link,, filtered signal is transmitted into after power amplifier amplifies once more treats the overlay area isolating with leading to outer signal by filter.In uplink, the signal of the travelling carriage mobile phone in the overlay area is transmitted into corresponding base station with same working method after by up amplification link processing, thereby finishes the transmission tasks of mobile phone signal and base station.
The repeater frequency-selecting technology, be the base station signal in the working frequency range of repeater to be carried out frequency-selecting amplify, to the then filtering inhibition of other irrelevant signal frequency, strengthen the uplink and downlink signals field intensity, thereby expanding communication scope and fill up the mobile communication coverage hole effectively, improve communication quality, make mobile communication system in selecting sector, carrier frequency, play the professional effect of allotment.The frequency-selecting that 4,6,8,12,16 channels are arranged commonly used at present.
Traditional repeater frequency-selecting technology uses the frequency-selecting technology of simulating usually.The analogue device design is adopted in frequency-selecting fully, and each channel uses independently intermediate-frequency channel, finishes frequency-selecting with the intermediate frequency Surface Acoustic Wave Filter.The analogue device volume is big, cost is high, makes the cabinet volume of repeater become big, cost up, and power consumption increases.Along with increasing of the number of channel, the quantity of repeater becomes multiple to increase, and machine room area sharply increases, and has increased the difficulty of machine maintenance simultaneously widely.
Referring to Fig. 1, traditional analog single channel frequency-selecting operation principle is: analog signal is after input processing unit is handled, deliver to the upconverter frequency conversion, deliver to the low-converter frequency conversion after finishing frequency-selecting by filter SAW, after the output processing unit processes, export analog signal.The realization of all functions of channel is all finished under the control of master clock unit PLL.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, task of the present invention provides a kind of multi-channel digital frequency-selecting technology, it has solved, and traditional simulation multichannel frequency-selecting small product size is big, cost is high, machine room area sharply increases, strengthened the machine maintenance difficulty, and power consumption etc. forms problems such as doubly increase along with the increase of the number of channel.
Technical solution of the present invention is as follows:
A kind of multi-channel digital frequency-selecting technology, it comprises duplexer, low noise amplifier and power amplifier, it also comprises input processing unit, output processing unit, AD conversion unit, D/A conversion unit, master clock unit, Digital IF Processing unit, interface unit, module main control unit and power supply device processing unit, and they connect by circuit;
Described input processing unit, output processing unit, AD conversion unit, D/A conversion unit, master clock unit, Digital IF Processing unit are formed numerical frequency and are selected module;
After input signal is handled through input processing unit, the AD conversion unit that enters on-site programmable gate array FPGA becomes digital signal with analog signal conversion, on-site programmable gate array FPGA carries out data operation to the digital signal after changing to be handled, finish numeral selection, digital filtering, obtain the data of each channel each channel; The digital frequency-selecting filter carries out filtering and selection to these data, and the digital signal of each channel of obtaining through D/A conversion unit, is become digital signal into analog signal, exports after the output processing unit processes; The function of each channel realizes all finishing under the control of master clock unit and module main control unit.
Multi-channel digital frequency-selecting technology of the present invention uses up-to-date software, radiotechnics and device, realizes required multichannel frequency-selecting function.The channel filtering of intermediate frequency realizes that with software the increase of the number of channel can not bring being multiplied of device cost.The application of software makes product reduce volume, power consumption exponentially, has guaranteed consistency of product and reliability, for complete machine has brought many-sided benefit.Can satisfy simultaneously the demand of communication system to multiple functions such as product multiselect band, BREATHABLE BANDWIDTH choosing band, multiselect frequency displacement frequency, each channel traffic measurement, digital optical fiber remote, carrier tanks.
The function that digital frequency-selecting of the present invention provides the simulation frequency-selecting to provide makes the new Digital repeater compare with traditional repeater, has the better application effect, has expanded the application space of repeater product, can be widely used in fields such as mobile communication base station.
Multi-channel digital frequency-selecting technology of the present invention has following three big functions:
1, overpower protection function.
Multi-channel digital frequency-selecting technology can guarantee that digital high-frequency amplification station is operated within the normal output power range, can not produce overpower output phenomenon, has avoided exporting the interference that all kinds of spurious signals cause system.The ALC functional response speed of simulation repeater is slow, can't the overpower of indivedual time slots in time be reflected, does not also just have the overpower protection effect.
2, upstream noise inhibit feature.
Guarantee the emission of up link noiseless power when the traffic time slot is idle of repeater, also just avoided raising the back noise level of base station uplink receiver, this point is even more important when the parallel connection of Duo Tai repeater is used.When used simultaneously in the Duo Tai repeater tradition repeater, the back noise level superposeed, and this has limited the usage quantity of repeater under same sub-district.When using many digital high-frequency amplification stations, the user that the up traffic time slot that is assigned with in the sub-district only has in the repeater area of coverage uses.Just condition has only a repeater at this time slot there is power emission the base station, and the up link of other repeater is all closed.The reception that this can greatly improve up link makes and uses the repeater of greater number to become possibility in the same sub-district simultaneously.
3, the traffic measurement function of up link can be provided.
Make the client can add up the telephone traffic that each carrier wave of separate unit repeater is absorbed easily, so both can grasp the result of use of website easily, also can carry out quantitative assessment, also can dispatch allocation of carriers when being necessary equipment investment.
Description of drawings
Fig. 1 is traditional analog single channel frequency-selecting fundamental diagram.
Fig. 2 is the fundamental diagram of a kind of multi-channel digital frequency-selecting technology of the present invention.
Fig. 3 is the fundamental diagram that uses 16 channel digital frequency-selectings by digital frequency-selecting technology of the present invention.
Fig. 4 is the application schematic diagram of a kind of multi-channel digital frequency-selecting technology of the present invention.
Embodiment
Referring to Fig. 2 to Fig. 4, the present invention is a kind of multi-channel digital frequency-selecting technology, it comprises the first duplexer C1, low noise amplifier LNA, power amplifier PA, input processing unit SI, output processing unit SO, AD conversion unit A/D, D/A conversion unit D/A, master clock unit PLL, Digital IF Processing cells D MFP, interface unit IO, module main control unit MCU and power supply device processing unit PO, and they connect by circuit.
Wherein, input processing unit SI, output processing unit SO, AD conversion unit A/D, D/A conversion unit D/A, master clock unit PLL, Digital IF Processing cells D MFP form numerical frequency and select module DFSM.
Digital IF Processing cells D MFP is the core of product, can design by technical requirement according to actual needs.All channel selections, filter function etc. in a slice on-site programmable gate array FPGA, realize by writing software that all this is that modeling scheme can not be realized.
Input processing unit SI, output processing unit SO realize functions such as down-conversion, anti-aliasing filter, mirror image filtering in the processing of input, output signal and amplification, the simulation.
AD conversion unit A/D and D/A conversion unit D/A finish the conversion of modulus and digital-to-analogue, have used present up-to-date switching device, and Spurious-Free Dynamic Range SFDR, signal to noise ratio snr, sampling bandwidth etc. can satisfy the designing requirement of frequency-selector product fully.
Master clock unit PLL provides simulation part to divide required radio frequency local oscillation signal, provides work clock for A/D, D/A, FPGA simultaneously.
Module main control unit MCU and interface unit IO control each several part, and the communication interface with the upper level control unit is provided, and have for example designed interfaces such as RS485, RS232, IIC, and the user can carry out multinomial selection according to actual needs.
In conjunction with referring to Fig. 2, after input signal is handled through input processing unit SI, the AD conversion unit A/D that enters on-site programmable gate array FPGA becomes digital signal with analog signal conversion, on-site programmable gate array FPGA carries out data operation to the digital signal after changing to be handled, finish numeral selection, digital filtering, obtain the data of each channel each channel.The digital frequency-selecting filter carries out filtering and selection to these data, and the digital signal of each channel of obtaining through D/A conversion unit D/A, is become digital signal into analog signal, handles the back through output processing unit SO and exports.The function of each channel realizes all finishing under the control of master clock unit PLL and module main control unit MCU.
In conjunction with referring to Fig. 3, developed digital frequency-selecting repeater (16 frequency-selecting) by digital frequency-selecting technology of the present invention, use two 16 channel digital frequency-selecting modules altogether, realize that the numeral of up-downgoing 16 channels is selected.Concrete operations are carried out frequency configuration by RS232/RS485 to module, thereby reach freely using of 2～16 frequency-selectings.
In conjunction with referring to Fig. 4, duplexer in the digital frequency-selecting technology of the present invention is the first duplexer C1 and the second duplexer C2, the first duplexer C1 meets low noise amplifier LNA, another termination input processing unit of low noise amplifier LNA SI, input processing unit SI meets another termination AD conversion unit A/D, another termination Digital IF Processing cells D of AD conversion unit A/D MFP, another termination D/A conversion unit of Digital IF Processing cells D MFP D/A, another termination output processing unit of D/A conversion unit D/A SO, another termination power amplifier of output processing unit SO PA, another termination of power amplifier PA second duplexer C2, master clock unit PLL meets input processing unit SI respectively, AD conversion unit A/D, Digital IF Processing cells D MFP, D/A conversion unit D/A, output processing unit SO.Interface unit IO connection module main control unit MCU, power supply device processing unit PO one termination module main control unit MCU, another termination numerical frequency of power supply device processing unit PO is selected module DFSM, and module main control unit MCU connects numerical frequency and selects module DFSM.
Adopt multi-channel digital frequency-selecting technology development product of the present invention, provide and the similar frequency-selective filtering function of simulation frequency-selector, more have superiority at aspects such as homogeneity of product and inhibition indexs.
Modular design of the present invention the overpower protection function; when surpassing shutter, input power prescribes a time limit; each channel can be closed automatically; guarantee that module can not produce improper output; final stage power amplifier to complete machine also provides timely protection simultaneously; and compare with simulation ALC function, reaction is more rapidly, in time.
Digital frequency-selecting technology of the present invention has noise suppressing function.Traditional simulation repeater in use, no matter whether signal input is arranged, amplifiers at different levels are all in work, can produce unnecessary noise output, especially up link can cause the up back noise of base station to be elevated when use simultaneously a plurality of repeaters, and this has also limited the use of repeater.Technology of the present invention has designed the input power measuring ability in the digital frequency-selecting device, have only input power to surpass and import when opening thresholding, and corresponding channel just can be opened.Because the reaction speed of digital processing mode is quick, the noise control that therefore can realize the branch time slot, divide channel.And in the simulation repeater, such function is to be difficult to realize.
Digital frequency-selecting technology of the present invention also has traffic measurement function (apolegamy function).By adding up the holding time of up each channel, can add up the telephone traffic that produces in the area of coverage multi-channel digital frequency-selecting device product of repeater, thereby can on network management system, realize channel dispatch, guarantee making full use of of resources for traffic.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.
Claims (2)
1. multi-channel digital frequency-selecting technology, it comprises duplexer, low noise amplifier and power amplifier, it is characterized in that, it also comprises input processing unit, output processing unit, AD conversion unit, D/A conversion unit, master clock unit, Digital IF Processing unit, interface unit, module main control unit and power supply device processing unit, and they connect by circuit;
Described input processing unit, output processing unit, AD conversion unit, D/A conversion unit, master clock unit, Digital IF Processing unit are formed numerical frequency and are selected module;
After input signal is handled through input processing unit, the AD conversion unit that enters on-site programmable gate array FPGA becomes digital signal with analog signal conversion, on-site programmable gate array FPGA carries out data operation to the digital signal after changing to be handled, finish numeral selection, digital filtering, obtain the data of each channel each channel; The digital frequency-selecting filter carries out filtering and selection to these data, and the digital signal of each channel of obtaining through D/A conversion unit, is become digital signal into analog signal, exports after the output processing unit processes; The function of each channel realizes all finishing under the control of master clock unit and module main control unit.
2. multi-channel digital frequency-selecting technology according to claim 1, it is characterized in that, described duplexer is first duplexer and second duplexer, first duplexer connects low noise amplifier, another termination input processing unit of low noise amplifier, input processing unit connects another termination AD conversion unit, another termination Digital IF Processing unit of AD conversion unit, another termination D/A conversion unit of Digital IF Processing unit, another termination output processing unit of D/A conversion unit, another termination power amplifier of output processing unit, another termination second duplexer of power amplifier, the master clock unit connects input processing unit respectively, AD conversion unit, the Digital IF Processing unit, D/A conversion unit, the output processing unit; Interface unit connection module main control unit, power supply device processing unit one termination module main control unit, another termination numerical frequency of power supply device processing unit is selected module, and the module main control unit connects numerical frequency and selects module.
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| CNA2008100424982A CN101350661A (en) | 2008-09-04 | 2008-09-04 | Multi-channel digital frequency-selecting technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010139241A1 (en) * | 2009-06-05 | 2010-12-09 | 中兴通讯股份有限公司 | Circuit and method for controlling multi-channel power |
| CN104579242A (en) * | 2014-12-15 | 2015-04-29 | 天津大学 | Frequency selecting filter for configurable bandwidths and configurable frequency points and implementation method thereof |
-
2008
- 2008-09-04 CN CNA2008100424982A patent/CN101350661A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010139241A1 (en) * | 2009-06-05 | 2010-12-09 | 中兴通讯股份有限公司 | Circuit and method for controlling multi-channel power |
| RU2487469C1 (en) * | 2009-06-05 | 2013-07-10 | ЗетТиИ Корпорейшн | Scheme and system for controlling power in multiple channels |
| US8842986B2 (en) | 2009-06-05 | 2014-09-23 | Zte Corporation | Circuit and method for controlling multi-channel power |
| CN104579242A (en) * | 2014-12-15 | 2015-04-29 | 天津大学 | Frequency selecting filter for configurable bandwidths and configurable frequency points and implementation method thereof |
| CN104579242B (en) * | 2014-12-15 | 2017-08-08 | 天津大学 | A kind of bandwidth can match somebody with somebody, frequency can match somebody with somebody frequency-selecting filter and its implementation |
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Open date: 20090121 |