US9270313B2 - Wireless receiver and method for wireless reception - Google Patents
Wireless receiver and method for wireless reception Download PDFInfo
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- US9270313B2 US9270313B2 US14/515,509 US201414515509A US9270313B2 US 9270313 B2 US9270313 B2 US 9270313B2 US 201414515509 A US201414515509 A US 201414515509A US 9270313 B2 US9270313 B2 US 9270313B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
- H04B1/28—Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
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- the disclosed embodiments of the present invention relate to a wireless receiver, and more particularly, to a wireless receiver and related wireless receiving method capable of switching between a single radio frequency (RF) receiving path and a double RF receiving path.
- RF radio frequency
- a wireless receiver such as a Wireless Local Area Network (WLAN) receiver, a Ling-Term Evolution (LTE) receiver, or a Worldwide Interoperability Microwave Access (WiMax) receiver, uses the in-phase path and the quadrature-phase path in the radio frequency (RF) circuit for demodulation, such as a Complementary Code Keying (CCK) or an orthogonal frequency division multiplexing (OFDM), to decode.
- RF radio frequency
- the conventional wireless receiver will reduce the power consumptions of each element in the in-phase path and the quadrature-phase path (such as the mixer, the low pass filter, or the Analog-to-Digital Converter (ADC)).
- the element design has its physical limit, and thus above method is not able to satisfy requirements for low power consumption of some products (especially the mobile devices).
- an innovative design for reducing the power consumption is required to solve the above-mentioned problems.
- RF radio frequency
- an exemplary wireless receiver for receiving an input RF signal and outputting a baseband decoded signal.
- the wireless receiver comprises: a RF receiving unit and a baseband receiving unit, wherein the RF receiving unit comprises: a first path and a second path.
- the first path is utilized for receiving the input RF signal and generating a first baseband input signal, the first path comprising a first filter, wherein a bandwidth of the first filter is broader than a bandwidth of a packet of the input RF signal.
- the second path is utilized for receiving the input RF signal and generating a second baseband input signal.
- the baseband receiving unit is utilized for receiving the first baseband input signal and the second baseband input signal to generate the baseband decoded signal, wherein one of the first path and the second path is an in-phase path, and the other one of the first path and the second path is a quadrature-phase path.
- the RF receiving unit When the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path to receive the input RF signal.
- an exemplary wireless receiving method for receiving an input radio frequency (RF) signal and outputting a baseband decoded signal.
- the wireless receiving method comprises: utilizing a first path in a RF receiving unit to receive the input RF signal and generate a first baseband input signal, wherein the first path comprises a first filter and a bandwidth of the first filter is broader than a bandwidth of a packet of the input RF signal; utilizing a second path in a RF receiving unit to receive the input RF signal and generate a second baseband input signal; and utilizing a baseband receiving unit to receive the first baseband input signal and the second baseband input signal to generate the baseband decoded signal; wherein one of the first path and the second path is an in-phase path, and the other one of the first path and the second path is a quadrature-phase path; when the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path to receive the input RF signal.
- the embodiments of the present invention can reduce power consumption of the receiver in an idle status to reduce the whole power consumption. Besides, the present invention can reduce power consumption of the receiver in all time in a situation of a receiving condition being not bad.
- FIG. 1 is a block diagram illustrating a wireless receiver according to an embodiment of the present invention.
- FIG. 2 shows a diagram illustrating even symmetric effect of positive and negative frequency in the first mode.
- FIG. 3 shows the power consumptions of the main elements in the different condition.
- FIG. 4 shows the power consumptions of the main elements in the different examples.
- FIG. 5 is a flowchart showing a wireless receiving method in accordance with an exemplary embodiment of the present invention.
- FIG. 1 is a block diagram illustrating a wireless receiver 100 according to an embodiment of the present invention.
- the wireless receiver 100 is utilized for receiving an input radio frequency (RF) signal S RF and outputting a baseband decoded signal S d , wherein the input RF signal S RF adopts an Orthogonal Frequency Division Multiplexing (OFDM), and the wireless receiver 100 can demodulate for OFDM.
- RF radio frequency
- the wireless receiver 100 is not limited to OFDM, but also can be applied to other system (such as a Complementary Code Keying (CCK) modulation system).
- CCK Complementary Code Keying
- the wireless receiver 100 comprises: a RF receiving unit 102 and a baseband receiving unit 104 , wherein the RF receiving unit 102 is utilized for receiving the input RF signal S RF and converting it to the digital domain and transmitting it to the baseband receiving unit 104 .
- the RF receiving unit 102 comprises a low noise amplifier 1022 , an in-phase path 1024 , and a quadrature-phase path 1026 .
- the in-phase path 1024 is utilized for receiving the amplified signal S LNA and generates a first baseband input signal S ANC1 , wherein the in-phase path 1024 comprises a first mixer 10242 , a first low pass filter 10244 , and a first analog-to-digital converter (ADC) 10246 .
- ADC analog-to-digital converter
- the quadrature-phase path 1026 is utilized for receiving the input RF signal S SNA and generates a second baseband input signal S ADC2 wherein the quadrature-phase path 1026 comprises a second mixer 10262 , a second low pass filter 10264 , and a second ADC 10266 .
- the first low pass filter 10244 and the second low pass filter 10264 are utilized for performing low pass filtering process for signals extracted by the first mixer 10242 and the second mixer 10262 from high frequency carrier waves, respectively, and the signals are converted from the analog domain to the digital domain by the first ADC 10246 and the second ADC 10266 , respectively.
- the baseband receiving unit 104 is utilized for performing a further signal process (such as a Carrier Frequency Offset (CFO) compensation) for the first baseband input signal S ADC1 and the second baseband input signal S ADC2 in the analog domain.
- a further signal process such as a Carrier Frequency Offset (CFO) compensation
- CFO Carrier Frequency Offset
- the wireless receiver 100 has a first mode and a second mode. In the first mode, only the in-phase path 1024 is turned on, and in the second mode, the in-phase path 1024 and the quadrature-phase path 1026 are turned on in the same time.
- the wireless receiver 100 in this embodiment is not limited to only turn on the in-phase path 1024 , but also can only turn on the quadrature-phase path 1026 .
- a bandwidth of the in-phase path 1024 is twice broader (or over twice broader) than a bandwidth of the wireless packet.
- the twice broader bandwidth is utilized for compensating the absent information of turning off the quadrature-phase path 1026 .
- a bandwidth of the wireless packet is 20 M
- a bandwidth of the in-phase path 1024 is required to be increased to at least 40 M including at least two sub-channels of 20 M. Due to the even symmetric effect of positive and negative frequency, increasing the bandwidth will receive the signals and image signals in the same time.
- a driver in the up layer has to inform the baseband receiving unit 104 the sub-channel where the packet is in. After the baseband receiving unit 104 receives the data of the whole 40 M bandwidth, only the sub-channel where the packet is in is required to be decoded.
- FIG. 2 shows a diagram illustrating even symmetric effect of positive and negative frequency in the first mode.
- a data in the right side in FIG. 2( a ) is in a first sub-channel having a bandwidth of 20 M, and an image data of even symmetric will be generated in the left side in FIG. 2( a ).
- a noise in the left side in FIG. 2( b ) will generate an image noise of even symmetric in the first sub-channel where the data is.
- the right side in FIG. 2( c ) is a result of adding the data and the image data.
- the first mode saves more power than the second mode
- the second mode may have a worse signal quality.
- a conservative mixing scheme is adopted in this embodiment, that is, the first mode is adopted in a part of the time, and the second mode is adopted in the rest of the time.
- the RF receiving unit 102 maintains in the first mode to save power.
- the wireless receiver 100 will enter into a packet receiving status, and the baseband receiving unit 104 will generate a control signal S c to turn on the quadrature-phase path 1026 , so as to switch the RF receiving unit 102 of the wireless receiver 100 from the first mode to the second mode to increase receiving ability.
- the control signal S c is via a Low-Speed Serial Interface (LSSI), a High-Speed Serial Interface (HSSI), or a direct-write control to turn on the quadrature-phase path 1026 , and when the wireless receiver 100 switches back to the idle status, the control signal S c will turn off the quadrature-phase path 1026 to switchback to the first mode.
- the Automatic Gain Control (AGC) time of the training sequence in the initial time of receiving packets can be utilized for performing transient convergence after turning on the quadrature-phase path 1026 . That is, in the AGC time defined in the spec, it is practical to only use the information of the in-phase path 1024 to perform the AGC to adjust signals until the AGC time is over.
- the in-phase path 1024 and the quadrature-phase path 1026 can be utilized normally for performing the demodulation together.
- mode switching of the wireless receiver 100 in the above embodiment is only for an illustrative purpose and is not meant to be a limitation of the present invention. For example, only switch to the second mode when the signal quality is not good, otherwise, maintain in the first mode.
- the OFDM is more sensitive to the Inter-Carrier Interference (ICI) generated by the carrier frequency offset.
- ICI Inter-Carrier Interference
- a carrier frequency offset estimation will be performed in the receiving terminal of the OFDM and a compensation is performed. That is, utilize the Auto-Correlation technology to get the phase in the time domain, and make a calculation for the phase to obtain a real carrier frequency offset estimation value and perform the compensation.
- the carrier frequency offset estimation can be performed in the frequency domain.
- perform a frequency tracing in the system level first after the frequency tracing is stable and the carrier frequency offset is lowered to a certain level, allow the wireless receiver 100 to switch to the first mode to save power.
- FIG. 3 shows the power consumptions of the main elements in the different condition.
- the elements comprise the mixer, the low pass filter, and the ADC.
- the power consumptions of the different elements in the different condition are represented by A, B, C, D, wherein A, B, C, D are real number bigger than 0.
- the 20 M in-phase path represents only the in-phase path is turned on, and the bandwidth of the in-phase path is 20 M.
- the 20 M in-phase/quadrature-phase path represents the in-phase path and the quadrature-phase path are turned on in the same time, and the bandwidths of the in-phase path and the quadrature-phase path are both 20 M.
- the 40 M in-phase path represents only the in-phase path is turned on, and the bandwidth of the in-phase path is 40 M.
- the 40 M in-phase/quadrature-phase path represents the in-phase path and the quadrature-phase path are turned on in the same time, and the bandwidths of the in-phase path and the quadrature-phase path are both 40 M.
- the power consumption of the prior art is the power consumption of the 20 M in-phase/quadrature-phase path (i.e. 2A+2B+2C).
- the power consumption of the first mode in the present invention is the power consumption of the 40 M in-phase path (i.e.
- A+D+C and the power consumption of the second mode in the present invention is the power consumption of 40 M in-phase/quadrature-phase path (i.e. 2A+2D+2C).
- the power consumption of the first mode in the present invention is lower than that of the prior art.
- the power consumption of the first mode in the present invention is lower than that of the prior art.
- the low pass filter has twice bigger the bandwidth, the power consumption of it is not twice higher, but only 1.2 or 1.3 times higher, and thus the below formula can be obtained via the empirical law.
- FIG. 4 shows the power consumptions of the main elements in the different examples.
- the ratio K of the second mode in all operation is required to be 5/9 ( ⁇ 0.56) or more.
- the ratio K is only required to be 3/23 ( ⁇ 0.13) or more.
- the wireless receiver such as a wireless LAN receiver, an LTE receiver, or a WiMax receiver
- the time in the idle status is often longer than in the receiving status.
- FIG. 5 is a flowchart showing a wireless receiving method 500 in accordance with an exemplary embodiment of the present invention, wherein the wireless receiving method 500 is utilized for receiving an input radio frequency (RF) signal and outputting a baseband decoded signal.
- RF radio frequency
- FIG. 5 is a flowchart showing a wireless receiving method 500 in accordance with an exemplary embodiment of the present invention, wherein the wireless receiving method 500 is utilized for receiving an input radio frequency (RF) signal and outputting a baseband decoded signal.
- RF radio frequency
- Step S 502 Utilize a first path in a RF receiving unit to receive the input RF signal and generate a first baseband input signal, the first path comprising a first filter;
- Step S 504 Utilize a second path in a RF receiving unit to receive the input RF signal and generate a second baseband input signal;
- Step S 506 Utilize a baseband receiving unit to receive the first baseband input signal and the second baseband input signal to generate the baseband decoded signal; wherein one of the first path and the second path is an in-phase path, and the other one of the first path and the second path is a quadrature-phase path; when the RF receiving unit operates in a first mode, the RF receiving unit only uses the first path of the first path and the second path to receive the input RF signal, and a bandwidth of the first filter is broader than a bandwidth of a wireless packet of the input RF signal.
- the steps 502 - 506 of the wireless receiving method 500 should be clearly understood by those of average skill in this art after reading the operational details and configuration details for FIGS. 1-4 , and thus further explanation of the details and operations for the steps 502 - 514 of the wireless receiving method 500 are omitted herein for the sake of brevity.
- the embodiments of the present invention can reduce power consumption of the receiver in an idle status to reduce the whole power consumption. Besides, the present invention can reduce power consumption of the receiver in all time in a situation of a receiving condition being not bad.
Abstract
Description
A+D+C<2A+2B+2C (1)
That is,
D−2B<A+C (2)
B<D<2B (3)
K(A+D+C)+(1−K)(2A+2D+2C)<2A+2B+2C (4)
That is,
K>2(D−B)/(A+C+D) (5)
Claims (20)
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TW103113756 | 2014-04-15 | ||
TW103113756A TWI533626B (en) | 2014-04-15 | 2014-04-15 | Wireless receiver and method for wireless reception |
TW103113756A | 2014-04-15 |
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TW201539992A (en) | 2015-10-16 |
TWI533626B (en) | 2016-05-11 |
US20150295609A1 (en) | 2015-10-15 |
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