WO2012103734A1 - Procédé et appareil d'élimination de brouillage de canal non orthogonal - Google Patents

Procédé et appareil d'élimination de brouillage de canal non orthogonal Download PDF

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Publication number
WO2012103734A1
WO2012103734A1 PCT/CN2011/076713 CN2011076713W WO2012103734A1 WO 2012103734 A1 WO2012103734 A1 WO 2012103734A1 CN 2011076713 W CN2011076713 W CN 2011076713W WO 2012103734 A1 WO2012103734 A1 WO 2012103734A1
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WO
WIPO (PCT)
Prior art keywords
value
signal
orthogonal
correlation
received signal
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Application number
PCT/CN2011/076713
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English (en)
Chinese (zh)
Inventor
吴更石
孙凤宇
张家佶
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201180000781.9A priority Critical patent/CN102224682B/zh
Priority to PCT/CN2011/076713 priority patent/WO2012103734A1/fr
Publication of WO2012103734A1 publication Critical patent/WO2012103734A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/004—Orthogonal
    • H04J13/0044—OVSF [orthogonal variable spreading factor]
    • 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
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7107—Subtractive interference cancellation

Definitions

  • a method for eliminating non-orthogonal channel interference including: performing correlation processing on a non-orthogonal signal and a received signal to obtain a first correlation value at a first timing; It is known that the orthogonal signal and the received signal are correlated to obtain a second correlation value; and the reconstructed signal obtained by the first correlation value and the second correlation value is subtracted from the received signal.
  • a first correlation module configured to perform a correlation process on the non-orthogonal signal and the received signal at the first timing to obtain a first correlation value
  • a second correlation module configured to perform correlation processing on the known orthogonal signal and the received signal to obtain a second correlation value
  • a signal processing module configured to subtract, from the received signal, a reconstructed signal obtained by the first correlation value and the second correlation value obtained by the first correlation module and the second correlation module.
  • FIG. 1 is a flowchart of a method for eliminating non-orthogonal channel interference according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for eliminating non-orthogonal channel interference according to Embodiment 2 of the present invention
  • FIG. 4 is a flowchart 2 of a method for eliminating non-orthogonal channel interference according to Embodiment 3 of the present invention
  • FIG. 5 is a flowchart 2 of a method for canceling non-orthogonal channel interference according to Embodiment 3 of the present invention
  • FIG. 6 is a flowchart of a method for eliminating non-orthogonal channel interference according to Embodiment 3 of the present invention
  • FIG. 1 is a flowchart of a method for eliminating non-orthogonal channel interference according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for eliminating non-orthogonal channel interference according to Embodiment 2 of the present invention
  • FIG. 6 is a flowchart for eliminating non-orthogonal according to Embodiment 4 of the present invention
  • FIG. 8 is a schematic structural diagram of an apparatus for eliminating non-orthogonal channel interference according to Embodiment 4 of the present invention
  • FIG. 9 is a schematic diagram of a signal processing module of the apparatus for eliminating non-orthogonal channel interference shown in FIG. Schematic diagram 1;
  • Figure 12 is a block diagram showing the structure of a signal processing module in the apparatus for eliminating non-orthogonal channel interference shown in Figure 7.
  • embodiments of the present invention provide a method and apparatus for eliminating non-orthogonal channel interference.
  • a method for eliminating non-orthogonal channel interference according to Embodiment 1 of the present invention includes:
  • Step 101 Perform correlation processing on the non-orthogonal signal and the received signal at the first timing to obtain a first correlation value.
  • the first timing in step 101 may be any timing of the non-orthogonal signal, or may be a timing of the non-orthogonal signal and the known orthogonal signal, which will not be repeated herein.
  • the non-orthogonal signals are generally known and can be generated by the requirements specified by the protocol; it can be a synchronization channel in a Wideband Code Dimensional Multiple Access (WCDMA) communication system ( Signal on Synchroniza t ion Channe l , SCH ); may also be a signal on a non-orthogonal channel in other communication systems with non-orthogonal channels.
  • WCDMA Wideband Code Dimensional Multiple Access
  • the non-orthogonal signal and the received signal are correlated and processed by step 101, that is, the correlation operation is performed on the non-orthogonal signal and the received signal at the first timing to obtain a first correlation value;
  • the correlation value is obtained by correlating the non-orthogonal signal with the received signal, and thus can indicate the proportion of the non-orthogonal signal in the received signal.
  • Step 102 Perform correlation processing on the known orthogonal signal and the received signal at the first timing to obtain a second correlation value.
  • the quadrature signal can know at which timing the non-orthogonal signal is correlated, and the known orthogonal signal is correlated with the received signal at the timing by step 102. deal with.
  • the known orthogonal signal is generally known and can be generated by a protocol-defined pattern, which can be adjusted without power; it can be a common pilot channel in a WCDMA communication system (Common Pilot Channe) l, CPICH) signal; can also be other known signals with good orthogonality in other communication systems with non-orthogonal channels.
  • the time slot of the non-orthogonal signal may also be first performed. Synchronization and other processing, no longer here - repeat.
  • the known orthogonal signal and the received signal are correlated and processed by step 102, that is, the correlation signal is correlated with the received quadrature signal and the received signal at the first timing to obtain a second correlation value;
  • the second correlation value is obtained by correlating the known quadrature signal and the received signal, and thus can indicate the proportion of the known quadrature signal in the received signal.
  • the reconstructed signal is subtracted from the received signal by the step 103, and the elimination of the non-orthogonal channel interference can be realized.
  • the reconstructed signal is obtained by using the first correlation value and the second correlation value obtained in step 101 and step 102.
  • the process of acquiring the reconstructed signal may include: first, according to the first correlation value and the second correlation The value calculates the power offset square root value of the known orthogonal channel and the non-orthogonal channel; then, the estimated value obtained by performing channel estimation on the received signal is multiplied by the power offset square root value; finally, the result of the multiplication operation is obtained. Convolution with non-orthogonal signals.
  • the reconstructed signal can also be obtained by other means, which is no longer described here.
  • the estimated value obtained by performing channel estimation on the received signal may be directly multiplied with the square root value of the power offset obtained by the first correlation value and the second correlation value; or the first correlation value and the second pass may be first
  • the power offset square root value obtained by the correlation value is quantized and the like, and then multiplied by the estimated value obtained by performing channel estimation on the received signal.
  • the method for eliminating non-orthogonal channel interference provided by the embodiment of the present invention can achieve the elimination of non-orthogonal channel interference by subtracting the reconstructed signal obtained by the first correlation value and the second correlation value from the received signal;
  • the first correlation value and the second correlation value are obtained by performing correlation processing on the non-orthogonal signal, the known orthogonal signal, and the received signal, so that the reconstructed signal obtained by the first correlation value and the second correlation value is close to the received signal.
  • the actual non-orthogonal signals are used to improve the performance of eliminating non-orthogonal channel interference.
  • the technical solution provided by the embodiment of the present invention solves the power offset square root value of the known orthogonal channel and the non-orthogonal channel specified by the protocol in the prior art, and the actual known orthogonal channel and the power of the non-orthogonal channel.
  • the square root value of the offset does not match, resulting in a known basis under the agreement
  • the method for eliminating non-orthogonal channel interference provided by Embodiment 2 of the present invention includes:
  • Step 201 Perform correlation processing on the non-orthogonal signal and the received signal to obtain a cross-correlation sequence.
  • the non-orthogonal signal may be correlated with a group of received signals to obtain a cross-correlation sequence by step 201.
  • the non-orthogonal signal may be correlated with the plurality of groups of received signals to obtain a plurality of cross-correlation sequences. , no longer here - repeat.
  • the maximum value position can be directly obtained through the cross-correlation sequence;
  • the maximum position of the cross-correlation sequence may be the mean of the maximum positions of the plurality of cross-correlation sequences.
  • the non-orthogonal signal and the received signal are correlated and processed by step 202, that is, the non-orthogonal signal and the received signal are correlated in the maximum position of the cross-correlation sequence to obtain a first correlation value;
  • the first correlation value is obtained by correlating the non-orthogonal signal with the received signal, and thus can indicate the proportion of the non-orthogonal signal in the received signal.
  • the known orthogonal signal and the received signal are correlated by step 203, that is, the known orthogonal signal and the received signal are correlated in the maximum position to obtain a second correlation value;
  • the correlation value is obtained by correlating the known quadrature signal and the received signal, and thus can indicate the proportion of the known quadrature signal in the received signal.
  • Step 204 Subtract the reconstructed signal obtained by the first correlation value and the second correlation value from the received signal. For the specific process, reference may be made to step 103 shown in FIG. 1 , which is not repeated here.
  • the method for eliminating non-orthogonal channel interference provided by the embodiment of the present invention can achieve the elimination of non-orthogonal channel interference by subtracting the reconstructed signal obtained by the first correlation value and the second correlation value from the received signal;
  • the first correlation value and the second correlation value are obtained by performing correlation processing on the non-orthogonal signal, the known orthogonal signal, and the received signal, so that the reconstructed signal obtained by the first correlation value and the second correlation value is close to the received signal.
  • the actual non-orthogonal signals are used to improve the performance of eliminating non-orthogonal channel interference.
  • the technical solution provided by the embodiment of the present invention solves the power offset square root value of the known orthogonal channel and the non-orthogonal channel specified by the protocol in the prior art, and the actual known orthogonal channel and the power of the non-orthogonal channel.
  • the offset square root value does not match, resulting in distortion of the reconstructed signal obtained by the power offset square root value of the known orthogonal channel and the non-orthogonal channel, the received signal and the non-orthogonal signal according to the protocol, so as to eliminate non-orthogonal channel interference. Performance is declining.
  • the method for eliminating non-orthogonal channel interference provided by Embodiment 3 of the present invention includes:
  • the first correlation value may indicate the proportion of the non-orthogonal signal in the received signal
  • the second correlation value may indicate the proportion of the known orthogonal signal in the received signal, and therefore, the first correlation
  • the ratio of the value to the second correlation value can be used as a reference for the square root of the known orthogonal channel and non-orthogonal channel power offset.
  • Step 304 Subtract the reconstructed signal obtained by the power offset square root value from the received signal.
  • the reconstructed signal in step 304 is obtained by the power offset square root value
  • the specific process of acquiring the reconstructed signal may include: estimating the squared root of the estimated value and the power offset obtained by performing channel estimation on the received signal. The value is multiplied; then, the result of the multiplication is convolved with the non-orthogonal signal.
  • the reconstructed signal can also be obtained by other methods according to the square root value of the power offset, which will not be repeated here.
  • the estimated value obtained by performing channel estimation on the received signal may be directly multiplied by the square root value of the power offset; or the power offset square root value may be first quantized, and then the estimated result obtained by performing channel estimation on the received signal The value is multiplied.
  • the method for eliminating non-orthogonal channel interference in this embodiment may further include:
  • Step 305 Quantify the power offset square root value to obtain a quantized value.
  • step 304 is specifically: subtracting the reconstructed signal obtained by the quantized value from the received signal.
  • the reconstructed signal is obtained by the quantized value in step 304.
  • the process of acquiring the reconstructed signal may include: multiplying the estimated value obtained by performing channel estimation on the received signal and the quantized value; , convolving the result of the multiplication with the non-orthogonal signal.
  • the reconstructed signal can also be obtained by other means, which is not repeated here.
  • Step 306 Determine whether a variance of the power offset square root value is less than a pre-stored variance threshold.
  • X is the square root of the power offset
  • N is Can be configured with parameters that can be modified.
  • step 304 is specifically: when the variance of the power offset square root value is less than the pre-stored variance threshold, the reconstructed signal obtained by the power offset square root value is subtracted from the received signal.
  • the power offset square root value is obtained by reconstructing a signal to eliminate interference from non-orthogonal channels.
  • the power offset square root value in step 304 may be the power offset square root value obtained in step 303, or may be the power offset after the power offset square root value obtained in step 303 is quantized. Square root value.
  • the method for eliminating non-orthogonal channel interference in this embodiment may further include: Step 307: Subtracting the reconstructed signal obtained by the pre-stored power offset square root value from the received signal.
  • step 306 if it is determined in step 306 that the variance of the square root of the power offset is greater than the pre-stored variance threshold, that is, the fluctuation of the square root of the power offset obtained in step 303 is large, and the signal may be received from step 307.
  • a method of subtracting a reconstructed signal obtained from a pre-stored power offset square root value to avoid reconstructed signal distortion, the pre-stored power offset square root value may be a known orthogonal channel and a non-orthogonal channel specified by the protocol
  • the square root of the power offset can also be the square root of the power offset actually measured by the field environment, which is no longer a “satisfaction”.
  • the method for eliminating non-orthogonal channel interference provided by the embodiment of the present invention can achieve the elimination of non-orthogonal channel interference by subtracting the reconstructed signal obtained by the first correlation value and the second correlation value from the received signal;
  • the first correlation value and the second correlation value are obtained by performing correlation processing on the non-orthogonal signal, the known orthogonal signal, and the received signal, so that the reconstructed signal obtained by the first correlation value and the second correlation value is close to the received signal.
  • the actual non-orthogonal signals are used to improve the performance of eliminating non-orthogonal channel interference.
  • the technical solution provided by the embodiment of the present invention solves the power offset square root value of the known orthogonal channel and the non-orthogonal channel specified by the protocol in the prior art, and the actual known orthogonal channel and the power of the non-orthogonal channel.
  • the offset square root value does not match, resulting in distortion of the reconstructed signal obtained by the power offset square root value of the known orthogonal channel and the non-orthogonal channel, the received signal and the non-orthogonal signal according to the protocol, so as to eliminate non-orthogonal channel interference. Performance is declining.
  • the apparatus for eliminating non-orthogonal channel interference provided by Embodiment 4 of the present invention includes:
  • the first correlation module 701 is configured to perform correlation processing on the non-orthogonal signal and the received signal at the first timing to obtain a first correlation value.
  • the first timing in the first correlation module 701 may be any timing of the non-orthogonal signal, or may be a timing of the non-orthogonal signal and the known orthogonal signal, which is not repeated here.
  • the non-orthogonal signal is generally known and can be generated by a pattern specified by a protocol, and the known orthogonal signal can be adjusted without power; it can be either WC ⁇ A communication
  • the non-orthogonal signal and the received signal are correlated by the first correlation module 701, that is, the correlation operation is performed on the non-orthogonal signal and the received signal at the first timing to obtain the first correlation value;
  • the first correlation value is obtained by correlating the non-orthogonal signal with the received signal, and thus can indicate the proportion of the non-orthogonal signal in the received signal.
  • the second correlation module 702 is configured to perform correlation processing on the known orthogonal signal and the received signal at the first timing to obtain a second correlation value.
  • the quadrature signal can know at which timing the non-orthogonal signal is correlated, and the second correlation module 702 correlates the known quadrature signal with the received signal at the timing.
  • the known orthogonal signal is generally known and can be generated by a protocol-defined requirement; it can be either a signal on the CPICH in the WC-A communication system; or in other communication systems having non-orthogonal channels.
  • a known signal with good orthogonality may also be first performed. Synchronization and other processing, no longer here - repeat.
  • the known orthogonal signal and the received signal are correlated by the second correlation module 702, that is, the correlation signal is correlated with the received quadrature signal and the received signal at the first timing to obtain a second correlation value. Since the second correlation value is obtained by performing correlation processing on the known quadrature signal and the received signal, the proportion of the known quadrature signal in the received signal may be indicated.
  • the signal processing module 703 is configured to subtract, from the received signal, the reconstructed signal obtained by the first correlation value and the second correlation value obtained by the first correlation module and the second correlation module.
  • the signal processing module 703 subtracts the reconstructed signal from the received signal, thereby enabling the elimination of non-orthogonal channel interference.
  • the reconstructed signal is obtained by the first correlation value and the second correlation value obtained by the first correlation module 701 and the second correlation module 702.
  • the process of acquiring the reconstructed signal may include: first, according to the first The correlation value and the second correlation value calculate a power offset square root value of the known orthogonal channel and the non-orthogonal channel; then, the estimated value obtained by performing channel estimation on the received signal is multiplied by the power offset square root value; finally, The result of the multiplication operation is convolved with the non-orthogonal signal.
  • the reconstructed signal can also be obtained by other methods according to the square root value of the power offset, which will not be repeated here.
  • the estimated value obtained by performing channel estimation on the received signal may be directly multiplied with the square root value of the power offset obtained by the first correlation value and the second correlation value;
  • the power offset square root value obtained by the first correlation value and the second correlation value may be first quantized, and then the estimated value obtained by performing channel estimation on the received signal may be multiplied, as shown in FIG.
  • the apparatus for eliminating non-orthogonal channel interference in this embodiment may further include:
  • the sequence obtaining module 700 is configured to perform correlation processing on the non-orthogonal signal and the received signal to obtain a cross-correlation sequence.
  • the sequence obtaining module 700 may perform correlation processing on the non-orthogonal signal and a set of received signals to obtain a cross-correlation sequence.
  • the non-orthogonal signal may be correlated with the multiple sets of received signals to obtain multiple mutual Related sequences, no longer here - repeat.
  • the first correlation module 701 is configured to perform correlation processing on the non-orthogonal signal and the received signal at the maximum position of the cross-correlation sequence obtained by the sequence acquisition module.
  • the maximum value position can be directly obtained through the cross-correlation sequence;
  • the maximum position of the cross-correlation sequence may be the mean value of the maximum positions of the plurality of cross-correlation sequences.
  • the determining sub-module 7034 is configured to determine whether the variance of the power offset square root value obtained by the offset value obtaining sub-module is less than a pre-stored variance threshold.
  • the determining sub-module 7034 determines whether the variance of the square root of the power offset is determined by the determining sub-module 7034 to be smaller than the pre-stored variance threshold, that is, the fluctuation of the square root of the power offset obtained by the offset value obtaining sub-module 7031 is small, and may pass The method of subtracting the reconstructed signal obtained from the square root value of the power offset from the received signal eliminates interference of the non-orthogonal channel.

Abstract

L'invention porte sur un procédé et un appareil d'élimination de brouillage de canal non orthogonal. Le procédé consiste à : dans une première séquence temporelle, corréler un signal non orthogonal à un signal reçu afin d'acquérir une première valeur de corrélation (101); dans la première séquence temporelle, corréler un signal orthogonal connu au signal reçu afin d'acquérir une seconde valeur de corrélation (102); et soustraire un signal reconstruit, qui est acquis à partir de la première valeur de corrélation et de la seconde valeur de corrélation, au signal reçu (103). La présente invention peut être appliquée dans un système de communication à canal non orthogonal, et augmenter les performances d'élimination du brouillage de canal non orthogonal.
PCT/CN2011/076713 2011-06-30 2011-06-30 Procédé et appareil d'élimination de brouillage de canal non orthogonal WO2012103734A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201180000781.9A CN102224682B (zh) 2011-06-30 2011-06-30 消除非正交信道干扰的方法和装置
PCT/CN2011/076713 WO2012103734A1 (fr) 2011-06-30 2011-06-30 Procédé et appareil d'élimination de brouillage de canal non orthogonal

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Application Number Priority Date Filing Date Title
PCT/CN2011/076713 WO2012103734A1 (fr) 2011-06-30 2011-06-30 Procédé et appareil d'élimination de brouillage de canal non orthogonal

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1965594A (zh) * 2004-06-04 2007-05-16 艾利森电话股份有限公司 蜂窝通信网络中的信号强度测量
US7428263B2 (en) * 2000-02-23 2008-09-23 Ipr Licensing, Inc. Method for using a non-orthogonal pilot signal with data channel interference cancellation
CN101540744A (zh) * 2009-04-15 2009-09-23 深圳华为通信技术有限公司 数据接收处理方法、装置与用户终端
WO2011035961A1 (fr) * 2009-09-25 2011-03-31 Icera Inc Canal de synchronisation annulant une interférence dans un réseau cellulaire sans fil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7428263B2 (en) * 2000-02-23 2008-09-23 Ipr Licensing, Inc. Method for using a non-orthogonal pilot signal with data channel interference cancellation
CN1965594A (zh) * 2004-06-04 2007-05-16 艾利森电话股份有限公司 蜂窝通信网络中的信号强度测量
CN101540744A (zh) * 2009-04-15 2009-09-23 深圳华为通信技术有限公司 数据接收处理方法、装置与用户终端
WO2011035961A1 (fr) * 2009-09-25 2011-03-31 Icera Inc Canal de synchronisation annulant une interférence dans un réseau cellulaire sans fil

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