WO2012115192A1 - 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
- Publication number
- WO2012115192A1 WO2012115192A1 PCT/JP2012/054430 JP2012054430W WO2012115192A1 WO 2012115192 A1 WO2012115192 A1 WO 2012115192A1 JP 2012054430 W JP2012054430 W JP 2012054430W WO 2012115192 A1 WO2012115192 A1 WO 2012115192A1
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- WIPO (PCT)
- Prior art keywords
- rotation angle
- unit
- variance
- threshold
- tcxo
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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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
Definitions
- the present invention relates to a receiving device, a receiving method, and a computer program.
- 3GPP 3rd Generation Partnership In a wireless communication system such as LTE (Long Term Evolution) standardized by Project)
- a method of measuring and correcting an error amount using a phase rotation amount on the time axis of a synchronization signal or a reference signal can be considered.
- the range that can be followed is limited to the amount of phase rotation within +/- 180 degrees, and if the time interval of the signal for measuring the amount of phase rotation is large, the amount of phase rotation becomes large and the frequency error can be compensated. Becomes narrower. On the other hand, when the time interval is small, a small fluctuation is measured in a stable state, so that the measurement accuracy is lowered.
- the measurement time interval is reduced (initial pull-in) so that larger pull-in is possible, and stable communication starts. If possible, a two-step control is performed in which the measurement time interval is increased to improve the accuracy (follow-up).
- the statistical processing unit has performed dispersion calculation processing to monitor the variation in the phase difference of the phase difference signal from the phase difference measurement unit, and if the variance value exceeds the reference variance value, erroneous AFC control
- the AFC function is stopped by stopping the change of the error signal for AFC, and the error signal based on the phase difference information immediately before the stop is held. (For example, refer to Patent Document 1).
- the initial pull-in must be performed again. At this time, the initial pull-in causes problems such as generation of a period during which communication is impossible and increase in power consumption.
- An object of the present invention is to provide a receiving apparatus, a receiving method, and a computer program capable of reducing power consumption and shortening a time during which communication is not possible.
- the receiving apparatus of the present invention includes a dispersion calculation unit that calculates a dispersion of a rotation angle of a phase between reference signals, and a dispersion of the rotation angle that is smaller than a predetermined first threshold value.
- Frequency compensation means for compensating the frequency error and stopping the compensation for the frequency error when the dispersion of the rotation angle is equal to or greater than the first threshold value.
- the receiving method of the present invention includes a dispersion calculating step for calculating a dispersion of the rotation angle of the phase between the reference signals, and when the dispersion of the rotation angle is smaller than a predetermined first threshold value, the frequency error is compensated, A frequency compensation step of stopping frequency error compensation when the rotation angle variance is equal to or greater than the first threshold value.
- the computer program of the present invention causes the computer to calculate a dispersion calculation step for calculating the dispersion of the rotation angle of the phase between the reference signals, and if the dispersion of the rotation angle is smaller than a predetermined first threshold, Compensation, and when the dispersion of the rotation angle is greater than or equal to the first threshold, a process including a frequency compensation step for stopping compensation of the frequency error is performed.
- a receiving apparatus it is possible to provide a receiving apparatus, a receiving method, and a computer program that can shorten the time during which communication is not possible and reduce power consumption.
- FIG. 10 is a flowchart for explaining an example of processing of TCXO control.
- 6 is a block diagram illustrating another example of the configuration of the AFC control unit 16.
- FIG. 12 is a flowchart illustrating another example of TCXO control processing. It is a block diagram which shows the structural example of the hardware of a computer.
- FIG. 1 is a block diagram illustrating an example of a configuration of a receiving device.
- the receiving device 10 receives a signal by a communication method regulated by LTE.
- Receiving device 10 is RF (Radio)
- a frequency (Frequency) unit 11 an FFT (Fast Fourier Transform) unit 12
- a channel estimation unit 13 a demodulation unit 14
- a channel decoding unit 15 a channel decoding unit 15
- AFC control unit 16 A frequency (Radio) unit 11
- FFT Fast Fourier Transform
- a signal (hereinafter referred to as a received signal) received by a receiving antenna (not shown) is supplied to the RF unit 11 of the receiving device 10.
- the RF unit 11 performs A / D (Analog / Digital) conversion on the received signal and supplies a digital signal obtained as a result of the A / D conversion to the FFT unit 12.
- the FFT unit 12 divides the digital signal into frequency component data by Fourier transform.
- the FFT unit 12 supplies the frequency component data to the channel estimation unit 13.
- the channel estimation unit 13 estimates a channel estimation matrix representing a channel state by using a known signal (reference signal) that has been mapped in advance on a frequency resource among frequency component data.
- the channel estimation unit 13 supplies the channel estimation matrix to the demodulation unit 14 and the AFC control unit 16.
- the demodulator 14 demodulates the IQ component into likelihood information based on the received signal and the channel estimation matrix estimated by the channel estimator 13.
- the demodulator 14 supplies likelihood information to the channel decoder 15.
- the channel decoding unit 15 performs error correction decoding and error detection, and supplies the obtained result to the upper layer.
- the AFC control unit 16 in the receiving apparatus 10 measures the frequency error based on the channel estimation matrix estimated by the channel estimation unit 13, controls the crystal oscillator, and outputs a TCXO control value.
- FIG. 2 is a block diagram showing an example of the configuration of the AFC control unit 16.
- the AFC control unit 16 includes a correlation calculation unit 21, a rotation angle calculation unit 22, a measurement time correction unit 23, a time average processing unit 24, a TCXO control unit 25, and a dispersion measurement unit 26.
- the correlation calculation unit 21 includes a reception antenna a, a transmission antenna b, and a reference.
- RS time direction index
- index index i of Signal
- h channel estimation value
- the correlation calculation unit 21 supplies the RS correlation V (a, b, t) to the rotation angle calculation unit 22.
- the rotation angle calculation unit 22 calculates the rotation angle ⁇ (a, b, t) between RSs from the correlation value V (a, b, t) calculated by the correlation calculation unit 21 according to Equation (4). ... (4)
- Im (c) and Re (c) represent the lie part and real part of the complex number c, respectively.
- the rotation angle calculation unit 22 supplies the rotation angle ⁇ (a, b, t) between RSs to the measurement time correction unit 23.
- the measurement time correction unit 23 calculates the rotation angle ⁇ (a, b, t) from the time difference T (t) between the RS of the time direction index t and the RS of the time direction index t + 1 and the reference time T according to Expression (5). ) To the reference time T. ... (5)
- the measurement time correction unit 23 supplies the rotation angle aligned with the reference time T to the time average processing unit 24 and the dispersion measurement unit 26.
- the time average processing unit 24 has N rotation angles. Is obtained by the equation (6).
- the time average processing unit 24 has N rotation angles. Is supplied to the TCXO control unit 25.
- the dispersion measuring unit 26 has N rotation angles. Is obtained by Expression (7).
- the dispersion measuring unit 26 has N rotation angles. Is distributed to the TCXO control unit 25.
- the TCXO control unit 25 calculates the variance obtained by the variance measurement unit 26. Is smaller than the threshold value TH, the control value of TCXO is calculated and the control of TCXO is performed.
- the TCXO control unit 25 calculates the average rotation angle obtained by the time average processing unit 24. TCXO control value is calculated from TCXO.
- the TCXO control unit 25 If is equal to or greater than the threshold TH, the measurement result is discarded and control is performed so as not to change the frequency of the TCXO.
- FIG. 3 is a flowchart for explaining an example of processing of TCXO control.
- the correlation calculation unit 21 uses the reception antenna a, the transmission antenna b, the RS time direction index t, the RS frequency direction index i, and the corresponding channel estimation value h (a, b, t, i).
- the RS correlation is calculated according to the equation (1).
- step S12 the rotation angle calculation unit 22 obtains the rotation angle between the RSs from the correlation value obtained by the correlation calculation unit 21 according to Equation (4).
- step S13 the measurement time correction unit 23 calculates the rotation angle from the RS of the time direction index t and the RS of the time direction index t + 1, and the reference time T, using the equation (5) as a reference time. Align to T.
- step S14 the time average processing unit 24 obtains the average of the N rotation angles by the equation (6).
- step S15 the dispersion measuring unit 26 obtains the dispersion of the N rotation angles by Expression (7).
- step S16 the TCXO control unit 25 determines whether or not the variance of the N rotation angles is smaller than the threshold value TH. If it is determined in step S16 that the variance of the N rotation angles is smaller than the threshold TH, the procedure proceeds to step S17, and the TCXO control unit 25 calculates the control value of TCXO from the average value of the N rotation angles. To do. In step S18, the TCXO control unit 25 performs TCXO control, and the TCXO control processing ends.
- step S16 If it is determined in step S16 that the variance of the N rotation angles is greater than or equal to the threshold TH, the procedure proceeds to step S19, and the TCXO control unit 25 discards the measurement result.
- step S20 the TCXO control unit 25 performs control so as not to change the frequency of the TCXO, and the TCXO control process ends.
- TCXO may be controlled by referring to the power of the correlation vector of the reference signal.
- FIG. 4 is a block diagram showing another example of the configuration of the AFC control unit 16.
- the AFC control unit 16 shown in FIG. 4 includes a correlation calculation unit 21, a rotation angle calculation unit 22, a measurement time correction unit 23, a time average processing unit 24, a TCXO control unit 25, a dispersion measurement unit 26, and a power measurement unit 41.
- the correlation calculation unit 21 to the dispersion measurement unit 26 are the same as those shown in FIG.
- the correlation calculation unit 21 supplies the RS correlation obtained from the equation (1) to the rotation angle calculation unit 22 and the power measurement unit 41.
- the power measurement unit 41 uses the correlation vector calculated by the correlation calculation unit 21. From the equation (8), the power average is obtained.
- the power measurement unit 41 supplies the power average P (a, b, t) to the TCXO control unit 25.
- the TCXO control unit 25 calculates the variance obtained by the variance measurement unit 26. There smaller than the threshold value TH, and the electric power mean P obtained by the power measuring unit 41 (a, b, t) is only greater than the power threshold value TH P, and calculates a control value of the TCXO, implementing the control of the TCXO.
- the TCXO control unit 25 calculates the average rotation angle obtained by the time average processing unit 24. TCXO control value is calculated from TCXO.
- the TCXO control unit 25 If is equal to or greater than the threshold TH, the measurement result is discarded and control is performed so as not to change the frequency of the TCXO.
- TCXO control unit 25 the electric power mean P obtained by the power measuring unit 41 (a, b, t) may be less power threshold TH P, measurement results and discard control so as not to change the frequency of TCXO To do.
- FIG. 5 is a flowchart illustrating another example of TCXO control processing.
- the procedures in steps S41 to S45 are the same as the procedures in steps S11 to S15 in FIG.
- step S46 the power measurement unit 41 obtains the power average P (a, b, t) by the equation (8) from the correlation vector calculated by the correlation calculation unit 21.
- step S47 the TCXO control unit 25 determines whether or not the variance of the N rotation angles is smaller than the threshold value TH. If it is determined in step S47 that the variance of the N rotation angles is smaller than the threshold TH, the procedure proceeds to step S48, and the TCXO control unit 25 determines that the power average P (a, b, t) is the power threshold TH P. Determine if greater than.
- step S48 If it is determined in step S48 that the power average P (a, b, t) is greater than the power threshold value TH P , the procedure proceeds to step S49, and the TCXO control unit 25 calculates the TCXO from the average value of the N rotation angles. The control value is calculated. In step S50, the TCXO control unit 25 performs TCXO control, and the TCXO control processing ends.
- step S47 the case where the variance of the N rotation angle is determined to be equal to or greater than the threshold value TH, or, at step S48, the determined average power P (a, b, t) and is equal to or less than the power threshold TH P If so, the procedure proceeds to step S51, and the TCXO control unit 25 discards the measurement result. In step S52, the TCXO control unit 25 performs control so as not to change the frequency of the TCXO, and the TCXO control process ends.
- the variance may be calculated only when the power is large in order to reduce the processing amount.
- the initial pull-in operation is not required when the propagation path environment returns to a favorable state, which can reduce power consumption and communication time. Become.
- the reliability (dispersion) of the measured phase rotation amount is calculated, and when the value is equal to or greater than the threshold value, the frequency compensation operation is stopped.
- the series of processes described above can be executed by hardware or software.
- the computer program that constitutes the software can perform various functions by installing a computer embedded in dedicated hardware or various computer programs. For example, it is installed from a recording medium in a general-purpose personal computer that can be executed.
- FIG. 6 is a block diagram illustrating a configuration example of computer hardware that executes the above-described series of processing 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 computer 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 disc, or It is recorded on a removable medium 111 that is a package medium made of a semiconductor memory or the like, or 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 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 for processing.
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- Computer Networks & Wireless Communication (AREA)
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- Circuits Of Receivers In General (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Control)と称する。)が用いられる。
Project)で標準化されているLTE(Long Term Evolution)などの無線通信システムにおいては、Synchronization SignalやReference Signalの時間軸での位相回転量を用いて誤差量を測定し、補正する方法が考えられる。
Frequency)部11、FFT(Fast Fourier Transform)部12、チャネル推定部13、復調部14、チャネル復号部15、およびAFC制御部16を具備する。
Signal(以下、RSとも称する)の時間方向インデックス(index)t、RSの周波数方向インデックス(index)i、それに対応するチャネル推定値h(a,b,t,i)としたとき、式(1)に従い、RSの相関を算出する。
Claims (4)
- リファレンスシグナル間の位相の回転角の分散を計算する分散計算手段と、
上記回転角の分散が予め定めた第1の閾値より小さい場合、周波数誤差を補償し、上記回転角の分散が上記第1の閾値以上である場合、周波数誤差の補償を停止する周波数補償手段と
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、
リファレンスシグナルの相関ベクトルの電力を計算する電力計算手段をさらに有し、
前記周波数補償手段は、前記回転角の分散が前記第1の閾値より小さく、かつ前記相関ベクトルの電力が予め定めた第2の閾値より大きい場合、周波数誤差を補償し、前記回転角の分散が前記第1の閾値以上である場合、または、前記相関ベクトルの電力が前記第2の閾値以下である場合、周波数誤差の補償を停止する
ことを特徴とする受信装置。 - リファレンスシグナル間の位相の回転角の分散を計算する分散計算ステップと、
上記回転角の分散が予め定めた第1の閾値より小さい場合、周波数誤差を補償し、上記回転角の分散が上記第1の閾値以上である場合、周波数誤差の補償を停止する周波数補償ステップと
を含むことを特徴とする受信方法。 - リファレンスシグナル間の位相の回転角の分散を計算する分散計算ステップと、
上記回転角の分散が予め定めた第1の閾値より小さい場合、周波数誤差を補償し、上記回転角の分散が上記第1の閾値以上である場合、周波数誤差の補償を停止する周波数補償ステップと
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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CN201280010182XA CN103380574A (zh) | 2011-02-24 | 2012-02-23 | 接收装置、接收方法以及计算机程序 |
JP2013501120A JPWO2012115192A1 (ja) | 2011-02-24 | 2012-02-23 | 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 |
EP12749425.0A EP2680450A1 (en) | 2011-02-24 | 2012-02-23 | Receiving device, receiving method, and computer program |
US13/984,121 US20130322582A1 (en) | 2011-02-24 | 2012-02-23 | Receiver, receiving method, and computer program |
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JP2011-038469 | 2011-02-24 | ||
JP2011038469 | 2011-02-24 |
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US (1) | US20130322582A1 (ja) |
EP (1) | EP2680450A1 (ja) |
JP (1) | JPWO2012115192A1 (ja) |
CN (1) | CN103380574A (ja) |
TW (1) | TW201246850A (ja) |
WO (1) | WO2012115192A1 (ja) |
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JP2016131352A (ja) * | 2015-01-15 | 2016-07-21 | 富士通株式会社 | 通信装置、通信方法、及び通信プログラム |
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WO2017200315A1 (ko) * | 2016-05-18 | 2017-11-23 | 엘지전자(주) | 무선 통신 시스템에서 위상 잡음을 추정하기 위한 방법 및 이를 위한 장치 |
JP2018068631A (ja) * | 2016-10-28 | 2018-05-10 | キヤノン株式会社 | 放射線撮影システム、放射線表示方法 |
WO2018135672A1 (ko) * | 2017-01-17 | 2018-07-26 | 엘지전자(주) | 무선 통신 시스템에서 심볼 간 위상 회전 차이를 추정하기 위한 방법 및 이를 위한 장치 |
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JP2001223610A (ja) | 2000-02-10 | 2001-08-17 | Sharp Corp | Cdma受信機 |
JP2009171266A (ja) * | 2008-01-17 | 2009-07-30 | Nec Corp | 自動周波数制御方法および装置 |
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KR100265735B1 (ko) * | 1997-11-25 | 2000-09-15 | 윤종용 | Fft윈도우위치복원과샘플링클럭제어가연동되는ofdm수신장치및그방법 |
JP3304914B2 (ja) * | 1999-03-31 | 2002-07-22 | 日本電気株式会社 | 周波数補正方法 |
KR100782627B1 (ko) * | 2005-12-30 | 2007-12-06 | 포스데이타 주식회사 | 통신 단말기에서 반송파 주파수 오프셋을 추정하는 방법 및상기 방법을 수행하는 통신 단말기 |
EP2071787B1 (en) * | 2007-12-10 | 2013-03-13 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Method and apparatus for positioning an FFT- window in an OFDM-receiver |
JPWO2009081842A1 (ja) * | 2007-12-26 | 2011-05-06 | 日本電気株式会社 | 位相雑音補正回路、送信装置、受信装置、無線装置、無線通信システム、及び位相雑音補正方法 |
JP5067485B2 (ja) * | 2008-08-21 | 2012-11-07 | 富士通株式会社 | 受信機および受信方法 |
-
2012
- 2012-02-23 US US13/984,121 patent/US20130322582A1/en not_active Abandoned
- 2012-02-23 WO PCT/JP2012/054430 patent/WO2012115192A1/ja active Application Filing
- 2012-02-23 EP EP12749425.0A patent/EP2680450A1/en not_active Withdrawn
- 2012-02-23 JP JP2013501120A patent/JPWO2012115192A1/ja active Pending
- 2012-02-23 CN CN201280010182XA patent/CN103380574A/zh active Pending
- 2012-02-23 TW TW101105966A patent/TW201246850A/zh unknown
Patent Citations (2)
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JP2001223610A (ja) | 2000-02-10 | 2001-08-17 | Sharp Corp | Cdma受信機 |
JP2009171266A (ja) * | 2008-01-17 | 2009-07-30 | Nec Corp | 自動周波数制御方法および装置 |
Cited By (2)
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JP2016131352A (ja) * | 2015-01-15 | 2016-07-21 | 富士通株式会社 | 通信装置、通信方法、及び通信プログラム |
US10148471B2 (en) | 2015-01-15 | 2018-12-04 | Fujitsu Limited | Communication apparatus, communication method and communication system |
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JPWO2012115192A1 (ja) | 2014-07-07 |
US20130322582A1 (en) | 2013-12-05 |
EP2680450A1 (en) | 2014-01-01 |
CN103380574A (zh) | 2013-10-30 |
TW201246850A (en) | 2012-11-16 |
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