WO2014030183A1 - 無線送受信機、無線送受信機のアンテナ選択方法 - Google Patents
無線送受信機、無線送受信機のアンテナ選択方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception
- H04B7/0811—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception during preamble or gap period
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
- H04B7/0814—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching based on current reception conditions, e.g. switching to different antenna when signal level is below threshold
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
- H04L27/14—Demodulator circuits; Receiver circuits
Definitions
- the present invention relates to a transmission / reception antenna selection diversity technique for a wireless transmitter / receiver based on SINR values in GMSK and GFSK modulation.
- GFSK Gaussian-filtered Frequency Shift Keying
- GMSK Gaussian-filtered Minimum Shift Keying
- fading occurs in which received power is greatly reduced due to multipath during reception.
- the received power is reduced due to fading, there arises a problem that the demodulation performance of the received signal is deteriorated.
- One technique for solving this problem is a diversity technique using a plurality of antennas that utilizes the fact that the propagation paths of signals received by the antennas are different.
- diversity techniques There are various types of diversity techniques. One of them is an antenna selection diversity technique for selecting one from a plurality of antennas.
- the antenna selection diversity technique is a technique for improving communication quality by selecting and transmitting or receiving an antenna having good propagation path characteristics during transmission or reception.
- Patent Document 1 discloses a diversity technique in which an FSK demodulator selects an antenna having a larger RSSI value (received signal strength) of a received signal based on a detection result of a preamble signal.
- antenna selection is performed based on the RSSI value.
- the interference wave is mixed even if the received power is large. Communication quality is not always improved when an antenna having a large RSSI value is selected.
- the present invention has been made in order to solve the above-described problems.
- antenna selection diversity based on SINR (Signal to Interference and Noise) using a data frame preamble
- SINR Signal to Interference and Noise
- the purpose is to improve and improve communication quality.
- a wireless transceiver is configured to calculate SINR based on received preamble information received by an antenna and corresponding preamble information held in advance corresponding to the received preamble information.
- An integration unit that calculates a phase signal for each symbol with respect to the received preamble information, a power value calculation unit that calculates a power value based on the phase signal, and a correlation calculation that calculates desired signal power from the correlation value of the phase signal and the corresponding preamble information
- an SINR calculation unit that calculates an SINR value from the power value and the desired signal power.
- the antenna selection unit further includes a first SINR value calculated from the received preamble information received by the first antenna, and a second SINR value calculated from the received preamble information received by the second antenna.
- the antenna is selected based on the SINR value.
- an antenna switching unit is included, and the antenna switching unit transmits a radio signal to the antenna selected by the antenna selection unit.
- an antenna switching unit is included, and the antenna switching unit causes the antenna selected by the antenna selection unit to receive a radio signal.
- the phase detection unit calculates a phase based on the desired signal power calculated by the correlation calculation unit, and the bit timing shift detection unit is detected by the phase detection unit. A bit timing shift is detected based on the detected phase.
- the received power detector has a first reception when the first antenna receives the received preamble.
- the power and the second received power when the second antenna receives the reception preamble are calculated, and the reception control unit selects the antenna based on the first received power and the second received power.
- a radio transceiver an antenna selection method of a radio transceiver, a power value calculation unit that calculates a power value based on a phase signal, and a correlation calculation that calculates a desired signal power from a correlation value of the phase signal and corresponding preamble information This makes it possible to separate a desired wave from an interference wave and noise by using a preamble, and to reduce interference by receiving antenna selection diversity based on an SINR estimation value.
- FIG. 1 is an overall view of a wireless transmission / reception device in Embodiment 1.
- FIG. 3 is a diagram showing a preamble processing unit in the first embodiment.
- FIG. 3 is a diagram illustrating a SINR estimation unit according to Embodiment 1.
- FIG. 3 is a diagram showing a frame configuration in Embodiment 1.
- FIG. 4 is a flowchart at the time of transmission by the wireless transmission / reception apparatus in the first embodiment.
- 3 is a flowchart at the time of reception by the wireless transmission / reception apparatus in the first embodiment.
- 3 is a flowchart of a SINR estimation unit in the first embodiment.
- FIG. 10 is a diagram illustrating a SINR estimation unit in a second embodiment.
- FIG. 10 is an overall view of a wireless transmission / reception device in a fourth embodiment. 10 is a flowchart at the time of reception by the wireless transmission / reception device in the fourth embodiment. 10 is a flowchart of a SINR estimation unit in the fourth embodiment.
- FIG. 1 is a diagram showing a wireless transmission / reception apparatus according to Embodiment 1 of the present invention.
- 100 is an antenna switching unit
- 200 is an RF unit
- 300 is a bandpass filter unit
- 400 is a modulation unit
- 500 is a frame generation unit
- 600 is a transmission control unit
- 700 is a demodulation unit
- 800 is a preamble processing unit
- Reference numeral 900 denotes a reception control unit
- 110 denotes a frame detection unit
- 120 denotes an antenna # 1 which is a first antenna
- 130 denotes an antenna # 2 which is a second antenna.
- one wireless transmission / reception apparatus will be described as having a wireless signal transmission function and a reception function.
- the wireless transmission / reception apparatus is described as having two antennas, but the present invention is not limited to this, and there may be cases where there are three or more antennas.
- FIG. 2 is a diagram showing details of the preamble processing unit 800 according to the present embodiment.
- Reference numeral 810 denotes a bit timing detection unit
- 820 denotes a SINR estimation unit.
- FIG. 3 is a diagram showing details of the SINR estimation unit 820 according to the present embodiment.
- 821 is a frequency discrimination detection unit
- 822 is an integration unit
- 823 is a square calculation unit that is a power value calculation unit
- 824 is a correlation calculation unit
- 825 is a complex sine wave generation unit
- 826 is a SINR calculation unit
- an 827 antenna selection unit. is there.
- FIG. 4 shows a frame structure of data received by the wireless transmission / reception apparatus.
- 101 is a preamble
- 102 is a unique word
- 103 is a PHY payload.
- the preamble 101 is composed of bits “0” and “1”, and “0” continues, and then “1” continues for the same number of times as this “0” continues.
- “0” and “1” are not consecutive, “0” and “1” alternate.
- “01010101101...” In which one “0” and “1” are alternately arranged, “0011” and two “0” are consecutively arranged in succession and “001100110011.
- the preamble information is shared in advance by a transmitter that transmits data and a receiver that receives the data.
- the frame configuration is not necessarily limited to that in FIG. 4, and may be any frame configuration in which at least the preamble 101 exists.
- FIG. 5 is a flowchart of the operation at the time of “transmission” of the wireless transceiver.
- the transmission control unit 600 receives a transmission request from a host (for example, a MAC unit, not shown), the antenna switching unit 100, the modulation unit 400, and the frame generation unit 500 are requested based on the transmission request. Give instructions to be described later.
- step 11 the frame generation unit 500 adds the unique word 102 and the preamble 101 to the PHY payload 103 to be transmitted based on the instruction from the transmission control unit 600, and sends this frame signal to the modulation unit 400. Output.
- step 12 the modulation unit 400 performs GFSK or GMSK modulation on the frame signal input from the frame generation unit 500 based on an instruction from the transmission control unit 600, and the modulated signal is a bandpass filter unit. Output to 300.
- step 13 the bandpass filter 300 performs band limitation on the modulated signal input from the modulation unit 400 and outputs the band-limited signal to the RF unit.
- step 14 the RF unit 200 generates a radio signal by performing D / A conversion and up-conversion on the band-limited signal input from the bandpass filter 300 and outputs the radio signal to the antenna switching unit 100. To do.
- the antenna switching unit 100 outputs a radio signal to the antenna specified based on the instruction from the transmission control unit 600 (designated antenna of the antenna # 1 or the antenna # 2).
- the designated antenna # 1 or antenna # 2 transmits the input radio signal to the other receiver.
- the transmission operation is not limited to the method described here.
- FIG. 6 is a flowchart of the operation at the time of reception of the wireless transceiver.
- the preamble processing in step 22 and step 24 of FIG. 6 is bit timing processing and SINR estimation processing, and details thereof will be described later.
- reception control section 900 selects antenna # 1 or antenna # 2, and instructs antenna switching section 100 to switch to the selected antenna.
- antenna # 1 is selected first.
- the antenna # 1 switched by the antenna switching unit 100 outputs the detected radio wave to the RF unit 200.
- the RF unit 200 performs A / D conversion and down-conversion on the input signal and outputs it to the bandpass filter unit 300.
- the bandpass filter unit 300 performs band limitation on the input signal, and outputs the band-limited signal to the demodulation unit 700 and the preamble processing unit 800.
- the preamble processing unit 800 performs a preamble process on the signal of the preamble 101 that has been input for a certain period T 1.
- the SINR # 1 value calculated by performing the preamble processing is output to reception control section 900. The preamble process will be described later.
- reception control section 900 instructs antenna switching section 100 to switch from antenna # 1 to antenna # 2 after T1 has elapsed.
- the switched antenna # 2 outputs the detected radio wave to the RF unit 200, and the RF unit 200 performs A / D conversion and down-conversion and outputs the result to the bandpass filter unit 300.
- the bandpass filter unit 300 performs band limitation on the input signal, and outputs the band-limited signal to the demodulation unit 700 and the preamble processing unit 800.
- the preamble processing unit 800 performs preamble processing on the signal of the preamble 101 that has been input for a certain period T2.
- the SINR # 2 value calculated by performing the preamble processing is output to reception control section 900. The preamble process will be described later.
- reception control section 900 is based on SINR # 1, which is the SINR value estimated when preamble processing is performed on preamble 101 based on detection at antenna # 1, and detection at antenna # 2.
- SINR # 2 which is the SINR value estimated when the preamble processing is performed on the preamble 101, is compared.
- reception control section 900 causes antenna switching section 100 to select antenna # 1, and if SINR # 2 is large, reception control section 900 performs antenna switching in step 26.
- the unit 100 is made to select the antenna # 2. The calculation of the SINR value will be described later.
- step 28 the demodulator 700 starts demodulating the signal obtained by detection using the antenna selected in step 26 or step 27. Thereby, it is possible to demodulate a radio signal obtained using an optimal antenna.
- the frame detection unit 110 detects the unique word 102 portion of the frame from the demodulation result of the demodulation unit 700, and detects the start position of the PHY payload 103 following the unique word 102.
- step 30 the demodulator 700 outputs the demodulated PHY payload 103 to the upper level (for example, MAC) based on the detection of the frame start position by the frame detector 110.
- the upper level for example, MAC
- the bit timing detection unit 810 of the preamble processing unit 800 performs bit timing processing
- the SINR estimation unit 820 performs SINR estimation.
- the bit timing process is performed by the bit timing detection unit 810.
- a bit timing process for example, there is a zero cross timing detection as a general method, but the present invention is not limited to this.
- the frequency discrimination detection unit 821 performs frequency discrimination processing, converts the frequency component of the GFSK or GMSK modulated signal into amplitude, and outputs the converted signal to the integration unit 822. .
- step 33 the integration unit 822 performs integration processing for each sample on the signal subjected to frequency discrimination processing input from the frequency discrimination detection unit 821.
- step 34 the integration unit 822 performs integration processing by repeating step 32 and step 33 until one symbol has passed, and the phase signal for each symbol as the integration result is converted to the square calculation unit 823 and the correlation calculation unit. Output to 824.
- step 35 the square calculation unit 823 performs square calculation on the value integrated by one symbol in the integration process (the value at the n-th symbol is ph [n]), and the previous total power
- the value p [n-1] is integrated and calculated as the total power value p [n]. Specifically, it is calculated by the following formula.
- step 36 the correlation calculation unit 824 takes a complex correlation between ph [n] integrated by one symbol in the integration process and the complex sine wave generated by the complex sine wave generation unit 825, and obtains the previous correlation value.
- integration is performed with complex components to obtain a desired signal S [n].
- the complex sine wave generated by the complex sine wave generator is for the nth symbol, A complex sine wave is used.
- Ns is the number of samples of one symbol.
- Nb is a value based on a preamble determined in advance between the transmitter that transmits the radio signal and the receiver that receives the radio signal, and is “2” when “01” is repeated, and “0011” is repeated. Case 4 and 6 when “000111” is repeated.
- S [n] is calculated as follows. Note that Ph [n] is a scalar and S [n] is a vector value. * Is a complex multiplication. Steps 32 to 36 are repeated until the preamble processing time (T1 or T2) elapses. When the preamble processing time elapses, s [n] is output to the SINR calculation unit 826 as a desired signal.
- the SINR calculation unit 826 calculates an SINR estimated value.
- the SINR estimation value is calculated as follows, assuming that the total power is P, the desired signal power is S, the number of preamble symbols is Nsymb.
- the noise power N is calculated as follows.
- S / N may be used as the SINR estimated value without taking the log.
- equation (6) is recorded as SINR # 1 for the signal detected by antenna # 1
- SINR # 2 is recorded for the signal detected by antenna # 2.
- the antenna selection unit 827 compares SINR # 1 and SINR # 2, selects the antenna having the larger value, and uses the selected antenna for subsequent radio wave detection.
- the power value calculation unit that calculates the power value based on the phase signal, the desired signal from the correlation value of the phase signal and the corresponding preamble information It is possible to separate a desired wave from an interference wave and noise by using a preamble by power, and it is possible to reduce interference by receiving antenna selection diversity based on a pseudo SINR estimation value.
- the wireless transceiver has been described as having one RF unit 200, bandpass filter 300, demodulation unit 700, preamble processing unit 800, frame detection unit 110, and the like, but the present invention is not limited to this.
- antenna # 1 and antenna # 2 simultaneously detect radio waves and independently perform preamble processing or the like on the detected preamble 101, so that SINR # 1, SINR # 2 estimation accuracy can be improved, and reception quality can be improved.
- Embodiment 2 FIG.
- the preamble processing unit has been described as being divided into the bit timing detection unit 810 and the SINR estimation unit 820.
- the bit calculation is performed in order to detect the bit timing by using the result of the correlation calculation unit 824.
- the timing detection unit 810 becomes unnecessary. That is, by using the result of the correlation calculation unit 824 to detect the bit timing, the bit timing detection unit becomes unnecessary, and the circuit scale of the wireless transceiver can be reduced.
- only matters different from the first embodiment will be described, and description of common parts will be omitted.
- the SINR estimation unit 820 further includes a phase detector 828 and a bit timing shift detection unit 829.
- step 41 the bit timing deviation value calculated by the selected antenna is calculated from the bit timing deviation value Nbit # 1 (described later) calculated in step 22 and the bit timing deviation value Nbit # 2 (described later) calculated in step 24. Use to correct bit timing.
- FIG. 10 shows in detail the operation flow of the processing of step 22 and step 24 of FIG. 9 according to the second embodiment. Since steps other than step 39 are the same as those in the first embodiment, description thereof is omitted.
- the phase detection unit 828 calculates the phase phbit using the following equation (7) for the vector S [Nsymb] calculated by the correlation calculation unit 824 using the equation (3).
- the bit timing shift detection unit 829 converts the phase phbit into a bit timing shift Nbit. Since the sine wave used in Equation (2) is a sine wave with a cycle of Ns + Nb, the bit timing deviation is calculated as follows.
- the result of equation (8) is stored as Nbit # 1, and in step 24, it is stored as Nbit # 2.
- the correlation calculation unit calculates the phase based on the desired signal power, and the bit timing shift detection unit detects the bit timing shift based on the phase detected by the phase detection unit. Therefore, the bit timing processing circuit is not necessary, and the calculation scale and circuit scale can be reduced.
- Embodiment 3 FIG.
- transmission is performed using an antenna fixed on the transmission side, and the antenna selected at the time of reception is used.
- the reception side By using the antenna selected based on the SINR estimation performed in step 1 during transmission, communication quality can be improved in transmission and reception.
- the configuration diagram in the present embodiment is the same as that in the first embodiment.
- FIG. 11 shows an operation flow of the wireless transceiver at the time of “transmission”. Since steps other than step 14b are the same as those in the first or second embodiment, the description thereof is omitted.
- step 14b the antenna selected on the receiving side is selected, and when the data is transmitted, a radio signal is transmitted using the selected antenna.
- the antenna selected at the time of reception for transmission by using the antenna selected at the time of reception for transmission, it is possible to improve communication quality not only for reception but also for transmission.
- the antenna selected at the time of transmission and reception is described as being used.
- the present invention is not limited to this, and the antenna selected at the time of transmission can also be used.
- Embodiment 4 the reception antenna is switched based on both SINR estimation and reception power.
- SINR estimation if the absolute value of the SINR value of both antennas is small, it may not always be possible to select an appropriate antenna, and it is better to use the antenna with the higher received power. There is. Therefore, when the SINR estimated value of the selected antenna is equal to or smaller than a threshold value, reception is performed using the antenna having the larger reception power. By doing so, the receiving antenna accuracy can be further improved.
- FIG. 12 shows a configuration diagram according to the fourth embodiment. Except for the received power detection unit 140, the present embodiment is the same as the first to third embodiments.
- preamble processing section 800 is also the same as in the first to third embodiments.
- the received power calculation unit 140 calculates the average received power POW # 1 per symbol by using the antenna # 1.
- step 72 the preamble processing section in step 24, the reception power calculation unit 140 calculates the average reception power POW # 2 per symbol by the reception power calculation unit 140 using the antenna # 2.
- Step 73 and Step 74 the reception control unit 900 in Step 25 selects the larger one of the SINR estimation value # 1 and the SINR estimation value # 2 calculated by the preamble processing unit 800 and sets it as SINR_MAX.
- step 75 the threshold SINR_TH set in advance by the reception control unit 900 is compared with SINR_MAX.
- step 76 when the value of SINR_MAX is smaller than SINR_TH, POW # 1 and POW # 2 are compared.
- step 77 if the value of SINR_MAX is larger than SINR_TH, the SINR_MAX antenna is selected.
- step 77 if POW # 2 is large, antenna # 2 is selected.
- step 78 if POW # 1 is large, antenna # 1 is selected.
- the operation after antenna selection is the same as in the first to third embodiments.
- the calculation of the received powers POW # 1 and POW # 2 may be obtained from the output result of the band pass filter unit 300 instead of the received power calculation unit 140.
- the antenna selection accuracy can be improved.
- the radio transceiver according to the present invention and the antenna selection method using the radio transceiver are suitable for improving communication quality.
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Abstract
Description
図1はこの発明の実施の形態1にかかる無線送受信装置を示す図である。図1において、100はアンテナ切替部、200はRF部、300はバンドパスフィルタ部、400は変調部、500はフレーム生成部、600は送信制御部、700は復調部、800はプリアンブル処理部、900は受信制御部、110はフレーム検出部、120は第1のアンテナであるアンテナ#1、130は第2のアンテナであるアンテナ#2である。ここでは1つの無線送受信装置は無線信号の送信機能と受信機能とを有するとして説明する。また、ここでは無線送受信装置がアンテナを2つ有するとして説明するがこれに限られるものではなく、アンテナを3つ以上有する場合もある。
となる複素正弦波を用いる。Nsは1シンボルのサンプル数である。また、Nbは無線信号を送信する送信機と無線信号を受信する受信機の間で予め決められたプリアンブルに基づく値であり、「01」が繰り返される場合2であり、「0011」が繰り返される場合4であり、「000111」が繰り返される場合6となる。
プリアンブル処理時間(T1又はT2)が経過するまではステップ32~ステップ36を繰り返し、プリアンブル処理時間経過した場合は、s[n]を希望信号としてSINR演算部826に出力する。
として、雑音電力Nを計算する。上記の、SとNを用いてSINR推定値を
と計算する。ここで、logをとらずにS/NをSINR推定値としてもよい。ステップ22では式(6)をアンテナ♯1が検波した信号に対してSINR#1として記録し、ステップ24ではアンテナ♯2が検波した信号に対してSINR#2として記録する。
実施の形態1ではプリアンブル処理部はビットタイミング検出部810とSINR推定部820とに分けて説明したが、本実施の形態では相関演算部824の結果を流用してビットタイミング検出を行うためにビットタイミング検出部810が不要となる。つまり相関演算部824の結果を流用してビットタイミング検出を行うことで、ビットタイミング検出部が不要となり無線送受信機の回路規模削減効果がある。なお、ここでは、実施の形態1と異なる事項だけ説明し共通する部分については説明を省略する。
続いて、ビットタイミングずれ検出部829で、位相phbitからビットタイミングずれNbitに換算する。式(2)で使用する正弦波は周期がNs+Nbの正弦波であるため、以下の様にビットタイミングずれを算出する。
ステップ22では式(8)の結果をNbit#1として、ステップ24ではNbit#2として記憶する。
実施の形態1及び実施の形態2では、送信側で固定したアンテナを用いて送信を行い、受信の際に選択したアンテナを利用していることとして説明したが、本実施の形態では、受信側でおこなったSINR推定に基づいて選択したアンテナを送信時にも用いることで、送信及び受信で通信品質の向上が可能となる。本実施の形態における構成図は実施の形態1と同じである。
実施の形態4では、受信アンテナの切替をSINR推定と受信電力の両方を基準として行うものである。SINR推定のみを基準にアンテナを選択する際、両アンテナのSINR値の絶対値が小さい場合、必ずしも適切なアンテナ選択が出来ない場合があり、受信電力が大きい方のアンテナを使用した方がよい場合がある。そこで、選択したアンテナのSINR推定値があるしきい値以下の場合は受信電力の大きい方のアンテナを用いて受信する。そうすることで、受信アンテナ精度をさらに向上させることが可能となる。
825:複素正弦波生成部、826:SINR演算部、827:アンテナ選択部、101:プリアンブル、102:ユニークワード、103:PHYペイロード、140:受信電力計算部
Claims (7)
- アンテナが受信した受信プリアンブル情報と該受信プリアンブル情報に対応し予め保持した対応プリアンブル情報に基づいてSINRを算出する無線送受信機において、
前記受信プリアンブル情報に対してシンボル毎に位相信号を算出する積分部、
該位相信号に基づいて電力値を算出する電力値計算部、
前記位相信号と前記対応プリアンブル情報の相関値から希望信号電力を算出する相関演算部、
前記電力値と前記希望信号電力からSINR値を算出するSINR演算部、
を備えたことを特徴とする無線送受信機。 - 更に、アンテナ選択部を有し、
該アンテナ選択部は、第1のアンテナが受信した受信プリアンブル情報により算出された第1のSINR値、第2のアンテナが受信した受信プリアンブル情報により算出された第2のSINR値、に基づいてアンテナを選択すること
を特徴とする請求項1に記載の無線送受信機。 - 更にアンテナ切替部を有し、
該アンテナ切替部は、前記アンテナ選択部の選択したアンテナに無線信号を受信させることを特徴とする請求項2に記載の無線送受信機。 - 更にアンテナ切替部を有し、
該アンテナ切替部は、前記アンテナ選択部の選択したアンテナに無線信号を送信させることを特徴とする請求項2に記載の無線送受信機。 - 更に位相検出部、ビットタイミングずれ検出部を有し、
該位相検出部は、前記相関演算部が算出した希望信号電力に基づいて位相を算出し、
前記ビットタイミングずれ検出部は、前記位相検出部で検出された位相に基づいてビットタイミングずれを検出することを特徴とする請求項1乃至4に記載の無線送受信機。 - 更に受信電力検出部を有し、
前記選択したアンテナに対応したSINR値が、予め決められた閾値より小さい場合、
前記受信電力検出部は、第1のアンテナが受信プリアンブルを受信した際の第1の受信電力、第2のアンテナが受信プリアンブルを受信した際の第2の受信電力を算出し、
前記受信制御部は、前記第1の受信電力、前記第2の受信電力に基づいてアンテナを選択することを特徴とする請求項2に記載の無線送受信機。 - アンテナが受信する受信プリアンブル情報と該受信プリアンブル情報に対応し予め保持した対応プリアンブル情報に基づいてSINRを算出する無線送受信機のアンテナ選択方法において、
前記受信プリアンブル情報に対してシンボル毎に位相信号を算出する積分ステップ、
該位相信号に基づいて電力値を算出する電力値計算ステップ、
前記位相信号と前記対応プリアンブル情報の相関値から希望信号電力を算出する相関演算ステップ、
前記電力値と前記希望信号電力からSINR値を算出するSINR演算ステップ、
を備えたことを特徴とする無線送受信機のアンテナ選択方法。
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WO2021083728A1 (en) * | 2019-10-31 | 2021-05-06 | Thomson Licensing | Apparatus and methods for diversity antenna selection |
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