WO2016062033A1 - Procédé et dispositif de traitement de compensation de fréquence - Google Patents

Procédé et dispositif de traitement de compensation de fréquence Download PDF

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Publication number
WO2016062033A1
WO2016062033A1 PCT/CN2015/076487 CN2015076487W WO2016062033A1 WO 2016062033 A1 WO2016062033 A1 WO 2016062033A1 CN 2015076487 W CN2015076487 W CN 2015076487W WO 2016062033 A1 WO2016062033 A1 WO 2016062033A1
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WO
WIPO (PCT)
Prior art keywords
frequency
calculation result
frequency offset
value
receiver
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PCT/CN2015/076487
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English (en)
Chinese (zh)
Inventor
钟长龙
安靖
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中兴通讯股份有限公司
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Publication of WO2016062033A1 publication Critical patent/WO2016062033A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/02—Speed or phase control by the received code signals, the signals containing no special synchronisation information
    • H04L7/027—Speed or phase control by the received code signals, the signals containing no special synchronisation information extracting the synchronising or clock signal from the received signal spectrum, e.g. by using a resonant or bandpass circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines

Definitions

  • the present invention relates to the field of communications, and in particular to a frequency compensation processing method and apparatus.
  • the frequency of the local oscillator of the digital coherent receiver must be consistent with the frequency of the transmitter.
  • Common methods include directly processing the received signal (time domain method), or using the frequency domain information of the received signal for frequency offset estimation (frequency domain method).
  • the frequency domain method requires FFT operations and is highly complex.
  • the time domain method estimates the phase difference between adjacent signals. Due to the existence of the frequency offset, the phase between the adjacent sample values in addition to the modulation phase also includes the phase caused by the frequency difference, and the phase caused by the frequency difference is a constant value.
  • the complex multiplication and conjugate operations are performed on the received signal, and finally the effect of Gaussian noise is eliminated by the averaging method.
  • the calculation accuracy of this method cannot be improved due to noise due to a certain range.
  • it is susceptible to sudden interference noise, resulting in errors in the frequency offset calculation results.
  • the embodiment of the invention provides a frequency compensation processing method and device, so as to solve at least the problem that the frequency offset value cannot be calculated more accurately in the prior art, and thus the effective frequency compensation cannot be performed.
  • a frequency compensation processing method comprising: obtaining a frequency offset estimation value between a signal receiving frequency of a receiver and a signal transmitting frequency of a transmitter; and using a second-order loop filter The frequency offset estimation value is processed to obtain a frequency offset compensation value, and the signal reception frequency of the receiver is compensated by using the frequency offset compensation value.
  • compensating the signal receiving frequency of the receiver by using the frequency offset compensation value comprises: using the frequency offset compensation value to compensate the signal receiving frequency, to obtain a compensated signal receiving frequency. And processing the compensated signal receiving frequency by the second-order loop filter to obtain a first frequency offset compensation value; acquiring a difference between the first frequency offset compensation value and the theoretical frequency offset value; The difference value is processed through a plurality of or one of the second-order loop filters in sequence to obtain a final frequency offset compensation value, and the compensated signal receiving frequency is compensated using the final frequency offset compensation value.
  • obtaining a frequency offset estimation value between a frequency of a signal received by the receiver and a frequency of a corresponding signal sent by the transmitter includes: multiplying a plurality of sets of adjacent signals received by the receiver by a conjugate The first calculation result is subjected to a fourth power operation to obtain a second calculation result, wherein each set of adjacent signals includes two mutually adjacent signals; and the obtained plurality of the second calculation results are accumulated to obtain a third calculation result And obtaining an angle value for the third calculation result, to obtain a fourth calculation result; wherein, the angle value is obtained by multiplying the third calculation result by a factor of 2; and dividing the fourth calculation result by 4
  • the frequency offset estimate is described.
  • acquiring the frequency offset estimation value between the signal receiving frequency of the receiver and the signal transmitting frequency of the transmitter includes: multiplying two signals received by the receiver with an interval of N samples by conjugate The obtained first calculation result is subjected to a fourth power operation to obtain a second calculation result, wherein the N is a natural number greater than 1; and the obtained plurality of the second calculation results are accumulated to obtain a third calculation result; Calculating the angle value, obtaining a fourth calculation result; wherein, the angle value is obtained by multiplying the third calculation result by a factor of 2; and dividing the fourth calculation result by (4*N) to obtain the Frequency offset estimate.
  • a frequency compensation processing apparatus comprising: an acquisition module configured to acquire a frequency offset estimation value between a signal receiving frequency of a receiver and a signal transmission frequency of a transmitter; and a processing module And determining to process the frequency offset estimation value by using a second-order loop filter to obtain a frequency offset compensation value; and the compensation module is configured to compensate the signal receiving frequency of the receiver by using the frequency offset compensation value.
  • the compensation module includes: a first compensation unit configured to compensate the signal receiving frequency by using the frequency offset compensation value to obtain a compensated signal receiving frequency;
  • the signal receiving frequency is processed by the second-order loop filter to obtain a first frequency offset compensation value; and the acquiring unit is configured to obtain a difference between the first frequency offset compensation value and the theoretical frequency offset value; and the second compensation unit And configured to process the difference sequentially through multiple or one of the second-order loop filters to obtain a final frequency offset compensation value, and use the final frequency offset compensation value to receive the compensated signal
  • the frequency is compensated.
  • the acquiring module is further configured to perform a fourth calculation result by performing a fourth power calculation on the first calculation result obtained by multiplying the conjugates of the plurality of sets of adjacent signals received by the receiver, where Each set of adjacent signals includes two mutually adjacent signals; and the obtained plurality of the second calculation results are accumulated to obtain a third calculation result Obtaining an angle value for the third calculation result to obtain a fourth calculation result; wherein, the angle value is obtained by multiplying the third calculation result by a factor of 2; and dividing the fourth calculation result by 4 to obtain The frequency offset estimate.
  • the acquiring module is further configured to: perform a fourth power calculation to obtain a second calculation by multiplying a first calculation result obtained by multiplying two signals received by the receiver with an interval of N samples a result, wherein the N is a natural number greater than 1; the obtained plurality of the second calculation results are accumulated to obtain a third calculation result; and the third calculation result is obtained by obtaining an angle value to obtain a fourth calculation result; The angle value is obtained by multiplying the third calculation result by a factor of 2; the fourth calculation result is divided by (4*N) to obtain the frequency offset estimation value.
  • the frequency offset estimation value between the signal receiving frequency of the receiver and the signal transmitting frequency of the transmitter is obtained; the frequency offset estimation value is processed by the second-order loop filter to obtain the frequency offset compensation value;
  • the frequency offset compensation value is used to compensate the receiver signal receiving frequency, which solves the problem that the frequency offset value cannot be calculated more accurately in the prior art, and thus the effective frequency compensation cannot be performed, and the frequency compensation accuracy and frequency are improved.
  • the anti-interference ability of the compensation improves the stability of the system.
  • FIG. 1 is a flow chart of a frequency compensation processing method according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing the structure of a frequency compensation processing apparatus according to an embodiment of the present invention
  • FIG. 3 is a block diagram 1 of a structure of a frequency compensation processing apparatus according to an embodiment of the present invention.
  • FIG. 4 is a structural diagram of a frequency offset estimation method using a second-order negative feedback loop according to an embodiment of the present invention
  • FIG. 5 is a structural diagram of a fourth-order square frequency offset estimation method using a second-order negative feedback loop in the prior art
  • FIG. 6 is a structural diagram of a fourth-order square frequency offset estimation method using a second-order negative feedback loop according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a frequency compensation processing method according to an embodiment of the present invention. As shown in FIG. 1, the flow includes the following steps:
  • Step S102 acquiring a frequency offset estimation value between a signal receiving frequency of the receiver and a signal transmitting frequency of the transmitter;
  • Step S104 processing the frequency offset estimation value by using a second-order loop filter to obtain a frequency offset compensation value
  • Step S106 using the frequency offset compensation value to compensate the signal receiving frequency of the receiver.
  • the second-order loop filter is used to process the frequency offset estimation value between the signal receiving frequency of the receiver and the signal transmitting frequency of the transmitter, thereby obtaining a more accurate frequency offset compensation value, so as to facilitate the receiver.
  • the signal receiving frequency is compensated.
  • the calculation accuracy of the frequency offset estimation using the time domain method reaches a certain range, and cannot be improved due to noise, and is susceptible to sudden interference noise, resulting in The frequency offset calculation result is wrong.
  • the accuracy of frequency compensation and the anti-interference ability of frequency compensation are improved, and the stability of the system is improved.
  • the signal receiving frequency of the receiver is compensated by using the frequency offset compensation value.
  • the step specifically includes: using the frequency offset compensation value to compensate the signal receiving frequency, and obtaining the compensated
  • the compensated signal receiving frequency is processed by a second-order loop filter to obtain a first frequency offset compensation value, and the first frequency offset is obtained.
  • the difference between the compensation value and the theoretical frequency offset value; the difference is sequentially processed by a plurality of or one of the second-order loop filters to obtain a final frequency offset compensation value, and the final frequency offset compensation value is used to compensate the signal.
  • the receiving frequency is compensated.
  • the frequency of the compensated received signal is processed a plurality of times by the second-order loop filter to improve the accuracy of the final frequency offset compensation value.
  • obtaining a frequency offset estimate between the frequency of the signal received by the receiver and the frequency of the corresponding signal transmitted by the transmitter comprises: multiplying the plurality of sets of adjacent signals received by the receiver by conjugate The first calculation result is subjected to a fourth power operation to obtain a second calculation result, wherein each set of adjacent signals includes two mutually adjacent signals, and the obtained plurality of second calculation results are accumulated to obtain a third calculation result, The third calculation result obtains an angle value to obtain a fourth calculation result; dividing the fourth calculation result by 4 to obtain a frequency offset estimation value.
  • obtaining the frequency offset estimation value between the signal receiving frequency of the receiver and the signal transmitting frequency of the transmitter comprises: multiplying the two signals received by the receiver with the interval of N samples by conjugate The obtained first calculation result is subjected to a fourth power operation to obtain a second calculation result, wherein the N is a natural number greater than 1; and the obtained plurality of second calculation results are accumulated Obtaining a third calculation result; obtaining an angle value for the third calculation result, obtaining a fourth calculation result; wherein, the angle value is obtained by multiplying the third calculation result by a factor of 2; and dividing the fourth calculation result by (4*N ) Get the frequency offset estimate.
  • a frequency compensation processing device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term “module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • the apparatus includes: an acquisition module 22 configured to acquire a signal receiving frequency of a receiver and a signal transmission frequency of a transmitter. a frequency offset estimation value; the processing module 24 is connected to the obtaining module 22, configured to process the frequency offset estimation value by using a second-order loop filter to obtain a frequency offset compensation value; and the compensation module 26 is connected to the processing module 24, and is set to The receiver's signal reception frequency is compensated using the frequency offset compensation value.
  • the compensation module 26 includes: a first compensation unit 32 configured to compensate a signal receiving frequency by using a frequency offset compensation value, The compensated signal receiving frequency is obtained; the compensated signal receiving frequency is processed by the second-order loop filter to obtain a first frequency offset compensation value; and the obtaining unit 34 is connected to the first compensation unit 32 and configured to acquire the first The difference between the frequency offset compensation value and the theoretical frequency offset value; the second compensation unit 36 is connected to the obtaining unit 34, and is configured to process the difference sequentially through multiple or one second-order loop filter to obtain a final frequency.
  • the offset compensation value is used to compensate the compensated signal reception frequency using the final offset compensation value.
  • the obtaining module 22 is further configured to: perform a fourth calculation result by performing a fourth power calculation on the first calculation result obtained by multiplying the plurality of sets of adjacent signals conjugates received by the receiver, wherein each group The adjacent signal includes two mutually adjacent signals; the obtained plurality of second calculation results are accumulated to obtain a third calculation result; and the third calculation result is obtained by obtaining an angle value to obtain a fourth calculation result; wherein, the angle value is obtained
  • the third calculation result is multiplied by 2 times the circumference ratio; the fourth calculation result is divided by 4 to obtain the frequency offset estimation value.
  • the obtaining module 22 is further configured to perform a fourth calculation result by performing a fourth power calculation on the first calculation result obtained by multiplying two signals conjugates received by the receiver with the interval of N samples to obtain a second calculation result, wherein The N is a natural number greater than 1; the obtained plurality of second calculation results are accumulated to obtain a third calculation result; and the third calculation result is obtained by obtaining an angle value to obtain a fourth calculation result; wherein the angle value is the third calculation result The result is multiplied by a factor of 2; the fourth calculation result is divided by (4*N) to obtain a frequency offset estimate.
  • the preferred embodiment uses a second-order negative feedback loop method to perform time-domain frequency offset compensation calculation.
  • a method of gradually increasing the separation distance between two signals for calculating the phase difference value is employed.
  • the accuracy of the frequency offset estimation is improved.
  • the stability of the frequency offset estimation is enhanced.
  • Fig. 4 The structure diagram of the frequency offset estimation method using the second-order negative feedback loop is shown in Fig. 4.
  • a second-order negative feedback structure is employed.
  • the result of each frequency offset estimation passes through a second-order loop filter, and the output result is used as a frequency offset compensation value. Compensation is applied to the input frequency offset compensation data.
  • the input to-be-bias compensation data is compensated by the frequency offset of the loop output, and then output to the calculation module of the next stage.
  • the calculation module may be the compensation module 26 in FIG.
  • input to the frequency offset estimation module using the second-order negative feedback loop If there is a difference between the frequency offset compensation value and the true frequency offset value of the loop output, the data after the frequency offset compensation has the residual frequency offset.
  • the residual frequency offset is calculated by the frequency offset estimation module, and the calculation result is filtered by the loop, and the output value is the next frequency offset compensation value. In this way, by continuously calculating and compensating the residual frequency offset, the residual frequency offset value input to the frequency offset estimation module is gradually reduced, and the accuracy of the frequency offset compensation is improved.
  • the second-order loop filter eliminates the influence of the inaccuracy of a certain frequency offset estimation result caused by accidental factors such as burst noise.
  • the anti-interference ability of the frequency offset compensation is improved, and the stability is improved.
  • the time domain calculation method of frequency offset estimation usually uses the method of 4th power calculation.
  • FIG. 5 is a structural diagram of a fourth-order square frequency offset estimation method using a second-order negative feedback loop in the prior art, as shown in FIG. 5:
  • the adjacent two signals V k and V k-1 are multiplied by conjugate, and then the fourth power is used to eliminate the difference of the information phase.
  • the calculation results of a plurality of consecutive signals are accumulated to eliminate the noise phase difference value.
  • the angle value is obtained from the calculation result, and after dividing by 4, the frequency offset estimation value ⁇ T i is obtained .
  • FIG. 6 is a structural diagram of a fourth-order square frequency offset estimation method using a second-order negative feedback loop according to an embodiment of the present invention.
  • the improved fourth-order square frequency offset estimation method is shown in FIG. 6.
  • the calculation results of a plurality of consecutive signals are accumulated to eliminate the noise phase difference value.
  • the angle value is obtained from the calculation result, and after dividing (4*n), the frequency offset estimation value ⁇ T i is obtained .
  • the improved quadratic square frequency offset estimation method increases the phase difference by increasing the interval between two samples of the phase difference value, thereby making it easier to extract from the noise.
  • the calculation accuracy of the frequency offset estimation is improved.
  • the separation distance n is based on the accuracy requirement of the frequency offset estimation, and the specific value of the residual frequency offset can be adjusted in real time.
  • the second-order negative feedback loop is used to increase the sample interval for calculating the phase difference value, and the two methods are used together to improve the calculation accuracy of the frequency offset estimation and enhance the frequency offset estimation. stability.
  • the algorithm is easy to implement and requires less hardware resources to implement.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the frequency offset estimation value between the signal receiving frequency of the receiver and the signal transmitting frequency of the transmitter is obtained; and the frequency offset estimation value is processed by the second-order loop filter to obtain
  • the frequency offset compensation value is used to compensate the receiver signal receiving frequency by using the frequency offset compensation value, which solves the problem that the frequency offset value cannot be calculated more accurately in the prior art, and thus the effective frequency compensation cannot be performed, and the frequency is improved.
  • the accuracy of the compensation and the anti-interference ability of the frequency compensation improve the stability of the system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Noise Elimination (AREA)

Abstract

L'invention concerne un procédé et un dispositif de traitement de compensation de fréquence. Le procédé consiste à : acquérir une valeur estimée de décalage de fréquence entre une fréquence de réception de signal d'un récepteur et une fréquence d'envoi de signal d'un émetteur ; traiter la valeur estimée de décalage de fréquence en utilisant un filtre à boucle de second ordre pour obtenir une valeur de compensation de décalage de fréquence ; et compenser la fréquence de réception de signal du récepteur en utilisant la valeur de compensation de décalage de fréquence. La présente invention résout le problème de l'état de la technique selon lequel une compensation de fréquence ne peut pas être effectuée de façon efficace en raison du fait que la valeur de décalage de fréquence ne peut pas être calculée avec plus de précision, de sorte que la précision de compensation de fréquence et la capacité anti-interférence de compensation de fréquence soient améliorées et que la stabilité du système soit améliorée.
PCT/CN2015/076487 2014-10-20 2015-04-13 Procédé et dispositif de traitement de compensation de fréquence WO2016062033A1 (fr)

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CN201410560301.X 2014-10-20
CN201410560301.XA CN105591732B (zh) 2014-10-20 2014-10-20 频率补偿处理方法及装置

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CN111431609B (zh) * 2020-03-27 2021-06-01 南京信息工程大学 一种正交模分复用信号的接收方法和系统
US11716113B2 (en) * 2020-04-10 2023-08-01 Qualcomm Incorporated Frequency pre-compensation for high-speed train single frequency networks

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CN101076004A (zh) * 2006-05-16 2007-11-21 索尼株式会社 无线通信装置
CN101087158A (zh) * 2006-06-05 2007-12-12 中兴通讯股份有限公司 一种频率偏移估计的方法
CN103701740A (zh) * 2014-01-08 2014-04-02 北京华力创通科技股份有限公司 卫星移动通信中载波跟踪的方法及装置

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KR101238877B1 (ko) * 2009-06-30 2013-03-05 (주)에프씨아이 아이큐 임밸런스 추정 및 보상 방법
TWI408918B (zh) * 2010-02-03 2013-09-11 Mstar Semiconductor Inc 訊號處理電路及其方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101076004A (zh) * 2006-05-16 2007-11-21 索尼株式会社 无线通信装置
CN101087158A (zh) * 2006-06-05 2007-12-12 中兴通讯股份有限公司 一种频率偏移估计的方法
CN103701740A (zh) * 2014-01-08 2014-04-02 北京华力创通科技股份有限公司 卫星移动通信中载波跟踪的方法及装置

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