WO2012093674A1 - 受信装置および受信方法、並びにコンピュータプログラム - Google Patents
受信装置および受信方法、並びにコンピュータプログラム Download PDFInfo
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- WO2012093674A1 WO2012093674A1 PCT/JP2012/050029 JP2012050029W WO2012093674A1 WO 2012093674 A1 WO2012093674 A1 WO 2012093674A1 JP 2012050029 W JP2012050029 W JP 2012050029W WO 2012093674 A1 WO2012093674 A1 WO 2012093674A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
-
- 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
- H04B17/318—Received signal strength
-
- 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]
-
- 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
- H04B17/345—Interference values
Definitions
- the present invention is an application based on Japanese Patent Application No. 2011-000652 filed on January 5, 2011, and claims to receive the benefit of priority.
- the disclosure of the above application is hereby incorporated by reference in its entirety.
- the present invention relates to a receiving apparatus, a receiving method, and a computer program.
- an OFDM (Orthogonal Frequency Division Multiplexing) method such as LTE (Long Term Evolution) standardized by 3GPP (3rd Generation Partnership Project) is attracting attention.
- LTE Long Term Evolution
- 3GPP 3rd Generation Partnership Project
- the receiver performs synchronization determination based on the reception quality of the control channel as defined in 3GPP 36.213 v8.8.0 and 36.133 v8.7.0, and synchronization Report status to higher layers. Based on information such as the synchronization determination result in the receiver, the start / end of the transmission process to the base station is determined (see Non-Patent Document 1 and Non-Patent Document 2).
- the receiver calculates, for example, SNR (Signal to Noise Power Ratio) as an index representing reception quality.
- 3GPP stipulates that the synchronization determination is determined by the BLER (Block Error Rate) of the control channel.
- BLER Block Error Rate
- EESM Exposure Effective SNR Mapping
- the SIR (Signal to Interference Power Ratio) value measured by the receiver is compared with the reference values Qin and Qout, and synchronization determination processing is performed. It was.
- Patent Document 1 proposes a technique that can perform stable synchronization determination and transmission control even when there are variations in measured SIR values by adding moving average processing.
- Patent Document 2 proposes a method for adjusting the reference value based on the moving speed of the mobile station.
- the SNR is obtained by the ratio of noise power and signal power, it is necessary to calculate the noise power and signal power for each RS.
- the noise power is obtained for each RS, the number of samples is insufficient, so that the noise power cannot be calculated with sufficient accuracy. For this reason, it is necessary to use noise power averaged over the entire band.
- JP 2005-86587 A Japanese Patent Laying-Open No. 2005-253055
- the value of the reception quality SNR may pull the floor and the synchronization may not be lost.
- the effective SNR is calculated by the equation (1).
- the value of “1” is “1” for the RS with interference, and “0” for the other RSs.
- an object of the present invention is to solve the above-described problems, that is, to provide a receiving apparatus, a receiving method, and a computer program that can calculate the received quality SNR more accurately.
- a receiving apparatus includes a calculation unit that calculates a ratio between signal power in each RS and an average of all the band of signal power, and a threshold value at which the maximum value of the calculated ratio is predetermined And a first correction unit that corrects the signal power and the noise power when it is determined that the maximum value exceeds the threshold value.
- one aspect of the receiving apparatus of the present invention is that the SNR (Signal to Noise Power Ratio) is EESM (Exponential Effective SNR Mapping) from the signal power and noise power supplied from the first correction unit. It further includes calculation means for calculating by calculation, and second correction means for correcting the SNR in accordance with the level of the interference wave and the ratio of the interference wave in the band.
- SNR Signal to Noise Power Ratio
- EESM Exposure SNR Mapping
- the reception method of the present invention includes a calculation step of calculating a ratio between the signal power of each reference signal and the average of all signal power bands, and whether or not the maximum value of the calculated ratio exceeds a predetermined threshold value. And a correction step for correcting the signal power and the noise power when it is determined that the maximum value exceeds the threshold value.
- the computer program of the present invention includes a calculation step for calculating a ratio of the signal power of each reference signal and the average of all the signal power bands, and whether the maximum value of the calculated ratio exceeds a predetermined threshold value.
- the computer is caused to perform processing including a correction step for correcting the signal power and the noise power.
- FIG. 3 is a block diagram illustrating an example of a configuration of a reception quality SNR estimation unit 16.
- FIG. It is a flowchart explaining the process of estimation of reception quality SNR. It is a figure which shows the example of SNR. It is a block diagram which shows the structural example of the hardware of a computer. It is a figure which shows the example of actual SNR. It is a figure which shows the example of the conventional SNR calculated. It is a figure which shows the floor level of SNR after the conventional EESM.
- FIGS. 1 to 5 a receiving apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5 by taking LTE standardized in 3GPP as an example.
- the present invention is not limited to this system.
- FIG. 1 is a block diagram showing an example of the configuration of an LTE receiver.
- the receiver 10 is an example of a receiving apparatus, and includes an RF unit 11, an FFT (Fast Fourier Transform) unit 12, a channel estimation unit 13, a demodulation unit 14, a channel decoding unit 15, and a reception quality SNR estimation unit 16.
- FFT Fast Fourier Transform
- the RF unit 11 performs A / D (Analog / Digital) conversion on a signal received by a receiving antenna (not shown) of the receiver 10.
- the RF unit 11 supplies the received signal, which is a digital signal, to the FFT unit 12.
- the FFT unit 12 divides the received signal into frequency component data by Fourier transform.
- the channel estimation unit 13 estimates a channel estimation matrix (hereinafter also referred to as a channel estimation value) representing a channel state using an RS (Reference Signal) that is a known signal mapped in advance on a frequency resource.
- the channel estimation unit 13 supplies the channel estimation matrix to the demodulation unit 14 and the reception quality SNR estimation unit 16.
- the demodulator 14 demodulates the I component and the Q component into likelihood information based on the channel estimation matrix estimated by the channel estimator 13.
- the channel decoding unit 15 performs error correction decoding and error detection.
- the reception quality SNR estimation unit 16 estimates the reception quality SNR based on the channel estimation matrix estimated by the channel estimation unit 13, and supplies the reception quality SNR to an upper layer that performs synchronization determination processing.
- FIG. 2 is a block diagram illustrating an example of the configuration of the reception quality SNR estimation unit 16.
- the reception quality SNR estimator 16 includes a signal / noise power estimator 21, a signal / noise power corrector 22, an EESM calculator 23, and an SNR corrector 24.
- the signal / noise power estimation unit 21 estimates the signal power and the noise power from the channel estimation value supplied from the channel estimation unit 13.
- the signal / noise power correction unit 22 estimates the average signal power and average noise power within the time to be measured, and corrects the signal power and noise power. Further, the signal / noise power correction unit 22 calculates the ratio of the signal power in each RS and the average of all the band of the signal power, and determines whether or not the maximum value of the calculated ratio exceeds a predetermined threshold value. To do.
- the signal / noise power correction unit 22 includes a ratio calculation unit 41 and a determination unit 42.
- the ratio calculation unit 41 calculates the ratio between the signal power in each RS and the average of all the signal power bands.
- the determination unit 42 determines whether or not the maximum value of the ratio between the signal power in each RS and the average of all the signal power bands exceeds a predetermined threshold.
- the EESM calculator 23 calculates the reception quality SNR from the signal power and the noise power by EESM calculation.
- the SNR correction unit 24 corrects the reception quality SNR according to the level of the interference wave and the ratio of the interference wave in the band.
- FIG. 3 is a flowchart for explaining reception quality SNR estimation processing.
- the signal / noise power estimation unit 21 performs channel estimation value h ZF , which is a value after Zero Forcing, a reception antenna a, a transmission antenna b, a slot number (Slot number) n, and an RS index (RS index) i. Then, according to the equations (2) and (3), the signal power S in each RS (Reference Signal) and the average noise power ⁇ 2 of the entire band are calculated. ... (2)
- step S2 the signal / noise power correction unit 22 determines the number of reception antennas N rx , the number of transmission antennas N tx , the measurement start slot number n start , and the measurement end slot based on the signal / noise power calculated in the procedure of step S 1. From the number n end , the average signal power S ave and the average noise power ⁇ 2 ave within the time to be measured are estimated according to the equations (4) and (5). ... (4)
- step S3 the ratio calculation unit 41 of the signal plus noise power correction unit 22, the RS number N RS contained in the band, the ratio of the received power in each RS, and the entire band average received power ⁇ (i) (
- the power ratio ⁇ (i) is also calculated according to the equations (6) to (8). ... (6)
- step S4 the determination unit 42 of the signal plus noise power correction unit 22, the maximum value phi MAX power ratio phi (i) obtained above, it is compared with a threshold value P TH_1 a predetermined, maximum value phi MAX threshold It is determined whether or not PTH_1 is exceeded. Further, the signal / noise power correction unit 22 counts the number of RSs for which the obtained power ratio ⁇ (i) is equal to or greater than the threshold value P TH — 1, and the number of RSs for which the power ratio ⁇ (i) is equal to or greater than the threshold value P TH — 1. N peak is obtained.
- the signal / noise power correction unit 22 preliminarily calculates the average signal power S ave having a negative value as shown in Expression (9). Replace with the defined minimum value (MIN_VAL). ... (9)
- step S4 If it is determined in step S4 that the maximum value ⁇ MAX exceeds the threshold value P TH — 1 , the procedure proceeds to step S5, and the signal / noise power correction unit 22 performs power correction processing according to equation (10).
- step S6 the signal / noise power correction unit 22 calculates the SNR in each RS by using the equations (11) to (13). After step S6, the procedure proceeds to step S8. (10)
- step S4 If it is determined in step S4 that the maximum value ⁇ MAX does not exceed the threshold value P TH — 1 , the procedure proceeds to step S7, no particular correction processing is performed, and the signal / noise power correction unit 22 calculates the SNR in each RS. It calculates according to Formula (14). After step S7, the procedure proceeds to step S8. (14)
- step S8 the EESM calculator 23 calculates the reception quality SNR from the SNR value according to the equations (15) and (16) using the EESM. ... (15)
- the parameter ⁇ is determined by the number of transmitting / receiving antennas, the bandwidth, the coding rate of the control channel, and the like.
- the parameter ⁇ is adjusted so that the same reception quality SNR is output when the BLER is the same even under different propagation conditions.
- step S9 the SNR correction unit 24 determines whether or not the condition of N peak ⁇ ⁇ MAX ⁇ N RS > threshold value P TH — 2 is satisfied based on the RS number N RS , the maximum value ⁇ MAX , and the RS number N peak. judge.
- the threshold value PTH_2 is a predetermined power ratio threshold value, and is adjusted to be an optimum value by simulation or experiment.
- step S9 If it is determined in step S9 that the condition of N peak ⁇ ⁇ MAX ⁇ N RS > threshold value P TH — 2 is not satisfied, no correction process is performed, and the procedure proceeds to step S11.
- step S11 the EESM calculation unit 23 or the SNR correction unit 24 reports the reception quality SNR value obtained in this way to the upper layer, and the reception quality SNR estimation processing ends.
- the determination for performing the correction process on the signal power and the noise power is performed using the equation (18), but the determination may be performed using the values shown in the equations (19) to (22). good. ... (18)
- the calculation process is performed using all the RSs in the above example.
- the RS to be used may be sampled at an appropriate interval.
- the sampling interval may be changed according to the bandwidth, and the control may be performed such that the sampling interval is narrowed when the bandwidth is narrow, and the sampling interval is widened when the bandwidth is wide.
- the ratio between the band average received power and the maximum received power is calculated, and when the obtained ratio value is equal to or larger than a predetermined threshold value, the correction process is performed, so that it is actually shown in FIG. Even in such a case, an SNR that is close to the actual value can be calculated as shown in FIG. 4, and the reception quality SNR after the EESM calculation can be calculated accurately.
- squares indicate noise power
- circles indicate signal power
- diamonds indicate SNR.
- the vertical axis in FIG. 4 indicates power or SNR
- the horizontal axis in FIG. 4 indicates RS.
- the SNR may be further corrected according to the level of the interference wave and the ratio of the interference wave in the band.
- the ratio of the average received power in all bands and the received power at each RS is calculated, and when the calculated maximum value exceeds a predetermined threshold, correction processing is performed on the signal power and noise power. Do. When the calculated ratio is less than or equal to the threshold value, no correction process is performed. Thereafter, reception quality SNR measurement processing is performed using EESM, and after further correction according to the level of the interference wave and the ratio of the interference wave in the band, it is reported to the upper layer.
- the series of processes described above can be executed by hardware or software.
- the computer program that constitutes the software executes various functions by installing a computer embedded in dedicated hardware or various programs.
- a general-purpose personal computer can be installed from a computer program recording medium.
- FIG. 5 is a block diagram showing an example of the hardware configuration of a computer that executes the above-described series of processes using a computer program.
- a CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- An input / output interface 105 is further connected to the bus 104.
- the input / output interface 105 includes an input unit 106 including a keyboard, a mouse, and a microphone, an output unit 107 including a display and a speaker, a storage unit 108 including a hard disk and a non-volatile memory, and a communication unit 109 including a network interface.
- a drive 110 for driving a removable medium 111 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is connected.
- the CPU 101 loads the computer program stored in the storage unit 108 to the RAM 103 via the input / output interface 105 and the bus 104 and executes the computer program. A series of processing is performed.
- the program executed by the computer (CPU 101) is, for example, a magnetic disk (including a flexible disk), an optical disk (CD-ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc), etc.), a magneto-optical disk, or a semiconductor.
- the program is recorded on a removable medium 111 that is a package medium including a memory or the like, or is provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.
- the computer program can be installed in the computer by loading the removable medium 111 in the drive 110 and storing it in the storage unit 108 via the input / output interface 105. Further, the computer program can be installed in the computer by being received by the communication unit 109 via a wired or wireless transmission medium and stored in the storage unit 108. In addition, the computer program can be installed in the computer in advance by storing it in the ROM 102 or the storage unit 108 in advance.
- the program executed by the computer may be a computer program that is processed in time series in the order described in this specification, or in parallel or at a necessary timing such as when a call is made. It may be a computer program that performs the process.
- SYMBOLS 10 Receiver, 11 ... RF part, 12 ... FFT part, 13 ... Channel estimation part, 14 ... Demodulation part, 15 ... Channel decoding part, 16 ... Reception quality SNR estimation part, 21 ... Signal / noise power estimation part, 22 ... Signal / noise power correction unit, 23 ... EESM calculation unit, 24 ... SNR correction unit, 41 ... ratio calculation unit, 42 ... determination unit, 101 ... CPU, 102 ... ROM, 103 ... RAM, 108 ... storage unit, 109 ... Communication part, 111 ... Removable media
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Abstract
Description
本発明は受信装置および受信方法、並びにコンピュータプログラムに関する。
但し、γeff_dB<γMINの場合、γeff_dB=γMINとする。
Claims (6)
- 各リファレンスシグナルにおける信号電力と上記信号電力の全帯域の平均との比を算出する算出手段と、
算出された比の最大値が予め定めた閾値を超えるか否かを判定する判定手段と、
上記最大値が上記閾値を超えると判定された場合、上記信号電力および上記雑音電力を補正する第1の補正手段と
を有することを特徴とする受信装置。 - 請求項1に記載の受信装置において、
前記第1の補正手段から供給された前記信号電力および前記雑音電力からSNR(Signal to Noise Power Ratio)をEESM(Exponential Effective SNR Mapping)演算により演算する演算手段と、
干渉波のレベルおよび帯域内に占める干渉波の割合に応じて前記SNRを補正する第2の補正手段と
をさらに有することを特徴とする受信装置。 - 請求項2に記載の受信装置において、
前記演算手段は、前記第1の補正手段において、前記最大値が前記閾値を超えないと判定された場合、EESM演算で用いるリファレンスシグナルについて、予め定めた間隔でサンプリングを行う
ことを特徴とする受信装置。 - 請求項3に記載の受信装置において、
前記演算手段は、サンプリングの前記間隔を、帯域幅により変更する
ことを特徴とする受信装置。 - 各リファレンスシグナルにおける信号電力と上記信号電力の全帯域の平均との比を算出する算出ステップと、
算出された比の最大値が予め定めた閾値を超えるか否かを判定する判定ステップと、
上記最大値が上記閾値を超えると判定された場合、上記信号電力および上記雑音電力を補正する補正ステップと
を含むことを特徴とする受信方法。 - 各リファレンスシグナルにおける信号電力と上記信号電力の全帯域の平均との比を算出する算出ステップと、
算出された比の最大値が予め定めた閾値を超えるか否かを判定する判定ステップと、
上記最大値が上記閾値を超えると判定された場合、上記信号電力および上記雑音電力を補正する補正ステップと
を含む処理をコンピュータに行わせるコンピュータプログラム。
Priority Applications (4)
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EP12732222.0A EP2662999A1 (en) | 2011-01-05 | 2012-01-04 | Receiver, reception method, and computer program |
JP2012551864A JPWO2012093674A1 (ja) | 2011-01-05 | 2012-01-04 | 受信装置および受信方法、並びにコンピュータプログラム |
CN2012800047810A CN103283167A (zh) | 2011-01-05 | 2012-01-04 | 接收装置、接收方法以及计算机程序 |
US13/977,838 US20130294278A1 (en) | 2011-01-05 | 2012-01-04 | Receiver, reception method, and computer program |
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JP2011-000652 | 2011-01-05 | ||
JP2011000652 | 2011-01-05 |
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US (1) | US20130294278A1 (ja) |
EP (1) | EP2662999A1 (ja) |
JP (1) | JPWO2012093674A1 (ja) |
CN (1) | CN103283167A (ja) |
TW (1) | TW201238260A (ja) |
WO (1) | WO2012093674A1 (ja) |
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JP2015195512A (ja) * | 2014-03-31 | 2015-11-05 | 沖電気工業株式会社 | 無線通信装置及び無線通信プログラム |
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EP3136808A4 (en) | 2015-06-27 | 2017-06-07 | Huawei Technologies Co., Ltd. | Method and apparatus for determining signal-to-noise ratio during wireless communication |
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- 2012-01-04 WO PCT/JP2012/050029 patent/WO2012093674A1/ja active Application Filing
- 2012-01-04 EP EP12732222.0A patent/EP2662999A1/en not_active Withdrawn
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S. MUMTAZ; A. GAMERIO; J. RODRIGUEZ: "EESM for IEEE 802.16e: Wimax", 7TH IEEE/ACIS INTERNATIONAL CONFERENCE ON COMPUTER AND INFORMATION SCIENCE, 14 May 2008 (2008-05-14) |
SHAHID MUMTAZ ET AL.: "EESM FOR IEEE 802.16e: WiMaX, Computer and Information Science, 2008. ICIS 08", SEVENTH IEEE/ACIS INTERNATIONAL CONFERENCE, 14 May 2008 (2008-05-14), pages 361 - 366, XP031340074 * |
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JP2015195512A (ja) * | 2014-03-31 | 2015-11-05 | 沖電気工業株式会社 | 無線通信装置及び無線通信プログラム |
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US20130294278A1 (en) | 2013-11-07 |
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