WO2012103734A1

WO2012103734A1 - Method and apparatus for eliminating non-orthogonal channel interference

Info

Publication number: WO2012103734A1
Application number: PCT/CN2011/076713
Authority: WO
Inventors: 吴更石; 孙凤宇; 张家佶
Original assignee: 华为技术有限公司
Priority date: 2011-06-30
Filing date: 2011-06-30
Publication date: 2012-08-09
Also published as: CN102224682A; CN102224682B

Abstract

The invention discloses a method and an apparatus for eliminating non-orthogonal channel interference. The method includes: in a first time sequence, correlating a non-orthogonal signal with a received signal to acquire a first correlation value (101); in the first time sequence, correlating a known orthogonal signal with the received signal to acquire a second correlation value (102); and subtracting a reconstructed signal, which is acquired from the first correlation value and the second correlation value, from the received signal (103). The present invention can be applied in a communication system with a non-orthogonal channel, and increase the performance of eliminating the non-orthogonal channel interference.

Description

Method and apparatus for eliminating non-orthogonal channel interference

The present invention relates to the field of communications, and in particular, to a method and apparatus for eliminating non-orthogonal channel interference. Background technique

In the communication system, the orthogonal frequency variable spreading factor (OVSF) code can be allocated to the channel, so that the channels are orthogonal to each other, thereby reducing interference between channels; Some non-orthogonal channels are not assigned a 0VSF code, so that there is some interference between the non-orthogonal channel and other channels to which the 0VSF code is allocated.

In order to reduce interference caused by non-orthogonal channels, signals on non-orthogonal channels can be eliminated as interference signals. The process of eliminating non-orthogonal channel interference in the prior art includes: first, acquiring a reconstructed signal according to a power offset square root value of a known orthogonal channel and a non-orthogonal channel, a received signal, and a non-orthogonal signal, and then acquiring a reconstructed signal, and then The reconstructed signal is subtracted from the received signal.

In the process of implementing the above-mentioned elimination of non-orthogonal interference, the inventors have found that in some real networks, extreme scenarios or test scenarios, the power offset squared of the known orthogonal channel and non-orthogonal channel specified by the protocol is depreciated. The power offset squared value of the actual known orthogonal channel and non-orthogonal channel does not match, resulting in the power offset square root value, received signal and non-positive of the known orthogonal channel and non-orthogonal channel according to the protocol. The reconstructed signal obtained by the cross signal is distorted, so that the performance of eliminating non-orthogonal channel interference is degraded. Summary of the invention

Embodiments of the present invention provide a method and apparatus for eliminating non-orthogonal channel interference, which can improve performance of eliminating orthogonal channel interference.

In one aspect, a method for eliminating non-orthogonal channel interference is provided, 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.

In another aspect, an apparatus for eliminating non-orthogonal channel interference is provided, comprising:

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; And 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.

The method and apparatus for eliminating non-orthogonal channel interference provided by the embodiments of the present invention can achieve non-orthogonal channel interference elimination by subtracting the reconstructed signal obtained by the first correlation value and the second correlation value from the received signal; Since 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 actual non-orthogonal signals in the received signal 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 squared 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 non-orthogonal channel. The power 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 that the non-orthogonal channel is eliminated. The performance of the interference is degraded.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set forth in the description of the claims Other drawings may also be obtained from these drawings without the use of creative labor.

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. 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;

10 is a structural diagram of a signal processing module in the apparatus for eliminating non-orthogonal channel interference shown in FIG. Intent 2

11 is a schematic structural diagram 3 of a signal processing module in the apparatus for eliminating non-orthogonal channel interference shown in FIG. 7;

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.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In order to solve the problem of eliminating performance degradation of non-orthogonal channel interference in the prior art, embodiments of the present invention provide a method and apparatus for eliminating non-orthogonal channel interference.

As shown in FIG. 1, 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.

In this embodiment, 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.

In this embodiment, 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.

In this embodiment, it is known that 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. Wherein, 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. Wherein, in order to make the process of correlating the non-orthogonal signal and the received signal, and the process of correlating the known orthogonal signal and the received signal at the same timing, the time slot of the non-orthogonal signal may also be first performed. Synchronization and other processing, no longer here - repeat.

In this embodiment, 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.

Step 103: Subtract the reconstructed signal obtained by the first correlation value and the second correlation value from the received signal.

In the present embodiment, in the case where the timing of the non-orthogonal signals is aligned, 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. According to the square root of the power offset, the reconstructed signal can also be obtained by other means, which is no longer described here. Wherein, 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 power offset square root value of the orthogonal channel and the non-orthogonal channel, the reconstructed signal distortion obtained by the received signal and the non-orthogonal signal, so that the performance of eliminating non-orthogonal channel interference is degraded.

As shown in FIG. 2, 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. In this embodiment, 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.

Step 202: Perform correlation processing on the non-orthogonal signal and the received signal at a maximum position of the cross-correlation sequence to obtain a first correlation value.

In this embodiment, when the cross-correlation sequence in step 202 is obtained by correlation processing between the non-orthogonal signal and a set of received signals, the maximum value position can be directly obtained through the cross-correlation sequence; When the sequence is obtained by correlation processing between the non-orthogonal signal and the plurality of sets of received signals, the maximum position of the cross-correlation sequence may be the mean of the maximum positions of the plurality of cross-correlation sequences.

In this embodiment, the non-orthogonal signals in step 202 are generally known and can be generated by the requirements specified by the protocol; it can be the signal on the SCH in the wideband code division multiple access WC A communication system; It may be a signal on a non-orthogonal channel in other communication systems having non-orthogonal channels.

In this embodiment, 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.

Step 203: Perform correlation processing on the known orthogonal signal and the received signal at the maximum position to obtain a second correlation value.

In this embodiment, the known orthogonal signal in step 203 is generally known and can be generated by the requirements specified by the protocol; it can be either the signal on the CPICH in the WC-A communication system; or other positive or negative In a communication system of a cross channel, a known signal with good orthogonality.

In this embodiment, 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.

As shown in FIG. 3, the method for eliminating non-orthogonal channel interference provided by Embodiment 3 of the present invention includes:

Step 301 to step 302, performing a correlation operation on the non-orthogonal signal, the known orthogonal signal, and the received signal to obtain a first correlation value and a second correlation value. For the specific process, reference may be made to step 101 to step 102 shown in FIG. 1 , which is no longer referred to herein.

Step 303: The first correlation value and the second correlation value are divided to obtain a power offset squared value of the known orthogonal channel and the non-orthogonal channel.

In this embodiment, since 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. In this embodiment, the reconstructed signal in step 304 is obtained by the power offset square root value, and 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. Wherein, 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. Further, in order to reduce the influence of the fluctuation of the square root of the power offset on the reconstructed signal, as shown in FIG. 4, 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.

Correspondingly, step 304 is specifically: subtracting the reconstructed signal obtained by the quantized value from the received signal.

In this embodiment, 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. According to the quantized value, the reconstructed signal can also be obtained by other means, which is not repeated here.

Further, in order to prevent the channel condition from being poor, the reconstructed signal is distorted due to large fluctuations in the square root of the power offset. As shown in FIG. 5, the method for eliminating non-orthogonal channel interference in this embodiment may also Includes:

Step 306: Determine whether a variance of the power offset square root value is less than a pre-stored variance threshold.

In this embodiment, the variance of the power offset square root value in step 306 can be obtained by the following process: First, multiple powers are acquired according to the received signal received within a period of time and the known non-orthogonal signal and the known orthogonal signal. The square root value is offset; then, by the variance formula _σ ^ = _{ λ. _Χί) - _Χί γ , the variance of the square root of the power offset obtained in step 303 is obtained. In the variance formula, X is the square root of the power offset, and N is Can be configured with parameters that can be modified.

In this embodiment, the variance threshold pre-stored in step 306 may be a variance threshold obtained by theoretically analyzing the square root value of the power offset; or may be obtained by the formula σ ² =丄|^ ² , the X, ² is the variance of the square root of the power offset, N is a configurable parameter; preferably, N can be taken as 100; and other processing methods can be used to calculate the variance of the square root of the power offset over a period of time. Historical values are statistically processed.

At this time, 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.

In this embodiment, if it is determined in step 306 that the variance of the power offset square root value is less than the pre-stored variance threshold, that is, the fluctuation of the power offset square root value obtained by step 303 is small, and the subtraction from the received signal can be The power offset square root value is obtained by reconstructing a signal to eliminate interference from non-orthogonal channels. In this embodiment, 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.

As shown in FIG. 6, 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.

In this embodiment, 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”.

As shown in FIG. 7, 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.

In this embodiment, 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 丽 A communication The signal on the SCH in the system; it may also be a signal on a non-orthogonal channel in other communication systems with non-orthogonal channels.

In this embodiment, 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.

In this embodiment, it is known that 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. Wherein, 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. Wherein, in order to make the process of correlating the non-orthogonal signal and the received signal, and the process of correlating the known orthogonal signal and the received signal at the same timing, the time slot of the non-orthogonal signal may also be first performed. Synchronization and other processing, no longer here - repeat.

In this embodiment, 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.

In the present embodiment, in the case where the non-orthogonal signals are time-aligned, 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. Wherein, 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; Alternatively, 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.

In this embodiment, 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.

At this time, 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.

In this embodiment, when the cross-correlation sequence in the first correlation module 701 is obtained by performing correlation processing on the non-orthogonal signal and a set of received signals, the maximum value position can be directly obtained through the cross-correlation sequence; When the cross-correlation sequence in the correlation module 701 is obtained by performing correlation processing on the non-orthogonal signal and the multiple sets of received signals, 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 second correlation module 702 is specifically configured to perform correlation processing on the known orthogonal signal and the received signal at a maximum position of the cross-correlation sequence obtained by the sequence acquisition module.

Further, as shown in FIG. 9, the signal processing module 703 in this embodiment may include: an offset value obtaining sub-module 7031, configured to divide the first correlation value and the second correlation value to obtain a known orthogonality. The power offset squared between the channel and the non-orthogonal channel is only depreciated.

The first processing sub-module 7032 is configured to subtract, from the received signal, the reconstructed signal obtained by the power offset square root value obtained by the offset value acquisition sub-module.

In this embodiment, the reconstructed signal in the first processing sub-module 7032 is obtained by the power offset square root value, and the specific process of acquiring the reconstructed signal may include: estimating the value obtained by performing channel estimation on the received signal and Multiply the power offset square root value; then, multiply The result of the 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. Wherein, 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.

In order to reduce the influence of the fluctuation of the power offset squared value on the reconstructed signal, as shown in FIG. 10, the signal processing module 703 may include: an offset value acquisition sub-module 7031 and a first processing sub-module 7032, which may include:

The quantization sub-module 7033 is configured to quantize the power offset square root value obtained by the offset value acquisition sub-module to obtain a quantized value.

At this time, the first processing sub-module 7032 is specifically configured to subtract the reconstructed signal obtained by the quantized value obtained by the quantized submodule from the received signal.

In this embodiment, the reconstructed signal in the first processing sub-module 7032 is obtained by the quantized value, and the specific process of acquiring the reconstructed signal may include: estimating the estimated value and the quantized value obtained by performing channel estimation on the received signal. A multiplication operation is performed; then, the result of the multiplication operation is convolved with the non-orthogonal signal. The reconstructed signal can also be obtained by other means according to the quantized value, and will not be repeated here.

In order to prevent the channel condition from being poor, the reconstructed signal is distorted due to large fluctuations in the square root value of the power offset. As shown in FIG. 11, the signal processing module 703 includes the offset value acquisition sub-module 7031 and the first processor. In addition to the module 7032, the method may further include:

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.

In this embodiment, the variance of the power offset square root value in the submodule 7034 can be obtained by the following process: First, according to the received signal received in a period of time and the known non-orthogonal signal and the known orthogonal signal, the acquisition is more. The square root of the power offset; then, by the variance formula _σ ^ ₌ ^ ₍₍ λ^ _Χί) - _Χί γ , obtain the variance of the square root of the power offset obtained by the offset value acquisition sub-module 7031, X in the variance formula For the power offset square root value, N is a configurable parameter.

In this embodiment, the variance threshold pre-stored in the determining sub-module 7034 may be a variance threshold obtained by theoretically analyzing the square root value of the power offset; or may be obtained by the formula _σ ² =丄, the X, ² For the variance of the square root of the power offset, Ν is a configurable parameter Preferably, N can take 100; other processing methods can also be used to statistically process the historical value of the variance value of the square root of the power offset over a period of time.

At this time, the first processing sub-module 7032 is specifically configured to determine, when the sub-module determines that the variance of the power offset square root value is less than the pre-stored variance threshold, subtract the reconstructed signal obtained by the power offset square root value from the received signal.

In this embodiment, if 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.

In this embodiment, the power offset square root value of the first processing sub-module 7032 may be the power offset square root value obtained by the offset value obtaining sub-module 7031, or may be obtained by the offset value obtaining sub-module 7031. The power offset square root value is the square root of the power offset after quantization.

As shown in FIG. 12, the signal processing module 703 may further include:

The second processing sub-module 7035 is configured to subtract the reconstructed signal obtained from the pre-stored power offset square root value from the received signal.

In this embodiment, if it is determined by the determining sub-module 7034 that the variance of the power-offset square root value is greater 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 large, The method of subtracting the reconstructed signal obtained by the pre-stored power offset square root value from the received signal by the second processing sub-module 7035 to avoid reconstructing the signal distortion, the pre-stored power offset square root value may be specified by the protocol It is known that the power offset squared value of the orthogonal channel and the non-orthogonal channel is only the value of the square root of the power offset actually measured by the field environment, and is not repeated here.

The apparatus for eliminating non-orthogonal channel interference provided by the embodiment of the present invention can implement the elimination of the 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 power offset square root value of the orthogonal channel and the non-orthogonal channel, the reconstructed signal distortion obtained by the received signal and the non-orthogonal signal, so that the performance of eliminating non-orthogonal channel interference is degraded.

The method and apparatus for eliminating non-orthogonal channel interference provided by the embodiments of the present invention can be applied to a communication system having a non-orthogonal channel.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be implemented directly in hardware, in a software module executed by a processor, or in a combination of the two. Software modules can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

Claim

A method for eliminating non-orthogonal channel interference, comprising:

In the first timing, the non-orthogonal signal and the received signal are correlated to obtain a first correlation value; and at the first timing, the known orthogonal signal and the received signal are correlated to obtain a second Related value

A reconstructed signal obtained by the first correlation value and the second correlation value is subtracted from the received signal.

2. The method of claim 2, wherein the method further comprises:

Correlating the non-orthogonal signal with the received signal to obtain a cross-correlation sequence; in the first timing, correlating the non-orthogonal signal and the received signal into: a maximum of the cross-correlation sequence a value location correlates the non-orthogonal signal and the received signal;

And in the first timing, correlating the known orthogonal signal and the received signal into: performing correlation processing on the known orthogonal signal and the received signal at the maximum position.

The method for eliminating non-orthogonal channel interference according to claim 1, wherein the subtracting the reconstruction obtained by the first correlation value and the second correlation value from the received signal Signals, including:

And dividing the first correlation value and the second correlation value to obtain a power offset squared value of the known orthogonal channel and the non-orthogonal channel;

A reconstructed signal obtained by the power offset square root value is subtracted from the received signal.

4. The method of canceling non-orthogonal channel interference according to claim 3, wherein before said reconstructing a signal obtained by subtracting said power offset square root value from said received signal, said The method also includes:

Quantifying the power offset square root value to obtain a quantized value;

And subtracting, from the received signal, the reconstructed signal obtained by the power offset square root value is: subtracting the reconstructed signal obtained by the quantized value from the received signal.

5. The method of canceling non-orthogonal channel interference according to claim 3, wherein before said reconstructing a signal obtained by subtracting said power offset square root value from said received signal, said The method also includes:

Determining whether the variance of the square root value of the power offset is less than a pre-stored variance threshold; And subtracting, from the received signal, the reconstructed signal obtained by the power offset square root value is: when the variance of the power offset square root value is less than a pre-stored variance threshold, subtracting from the received signal A reconstructed signal obtained from the power offset square root value.

The method for canceling non-orthogonal channel interference according to claim 5, wherein when the variance of the square root of the power offset is greater than a pre-stored variance threshold, the method further includes:

A reconstructed signal obtained from a pre-stored power offset square root value is subtracted from the received signal.

7. A device for eliminating non-orthogonal channel interference, comprising:

a first correlation module, configured to perform correlation processing 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;

And 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.

8. The apparatus for eliminating non-orthogonal channel interference according to claim 7, further comprising:

a sequence obtaining module, configured to perform correlation processing on the non-orthogonal signal and the received signal to obtain a cross-correlation sequence;

The first correlation module is specifically configured to perform correlation processing on the non-orthogonal signal and the received signal at a maximum value position of a cross-correlation sequence obtained by the sequence obtaining module;

The second correlation module is specifically configured to perform correlation processing on the known orthogonal signal and the received signal at a maximum value position of a cross-correlation sequence obtained by the sequence obtaining module.

The apparatus for eliminating non-orthogonal channel interference according to claim 7, wherein the signal processing module comprises:

And an offset value obtaining submodule, configured to perform the division operation on the first correlation value and the second correlation value to obtain a power offset squared value of the known orthogonal channel and the non-orthogonal channel;

And a first processing submodule, configured to subtract, from the received signal, the reconstructed signal obtained by the power offset square root value obtained by the offset value obtaining submodule.

The device for eliminating non-orthogonal channel interference according to claim 9, further comprising:

a quantization submodule, configured to perform a power offset square root value obtained by the offset value acquisition submodule Quantize to obtain a quantized value;

The first processing submodule is specifically configured to subtract the reconstructed signal obtained by the quantized value obtained by the quantizing submodule from the received signal.

a determining submodule, configured to determine whether a variance of a power offset square root value obtained by the offset value obtaining submodule is less than a pre-stored variance threshold;

The first processing sub-module is specifically configured to: when the determining sub-module determines that the variance of the power offset square root value is less than a pre-stored variance threshold, subtracting, by the power offset, a square root value from the received signal The reconstructed signal obtained.

The device for eliminating non-orthogonal channel interference according to claim 11, wherein when the variance of the square root of the power offset is greater than a pre-stored variance threshold, the method further includes:

And a second processing submodule, configured to subtract, from the received signal, the reconstructed signal obtained by the pre-stored power offset square root value.