WO2016145922A1

WO2016145922A1 - Detection method and device

Info

Publication number: WO2016145922A1
Application number: PCT/CN2015/099218
Authority: WO
Inventors: 吴凯
Original assignee: 电信科学技术研究院
Priority date: 2015-03-13
Filing date: 2015-12-28
Publication date: 2016-09-22
Also published as: CN106034091A

Abstract

Disclosed are a detection method and device, which are used for solving the problem that the performance of a system will be reduced by adopting a single detection algorithm on a PRB of a PDSCH or PUSCH. The method comprises: determining an interfered physical resource block and a non-interfered physical resource block in scheduled physical resources; calculating a first judgement amount for the non-interfered physical resource block by means of a detection algorithm without processing an interference, determining a first soft bit sequence according to the first judgement amount, calculating a second judgement amount for the interfered physical resource block by means of a detection algorithm processing the interference, and determining a second soft bit sequence according to the second judgement amount; and determining a detection result according to the first soft bit sequence and the second soft bit sequence.

Description

Detection method and device

The present application claims priority to Chinese Patent Application No. 201510111908.4, entitled "A Detecting Method and Apparatus", filed on March 13, 2015, the entire disclosure of which is incorporated herein by reference.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a detection method and apparatus.

Background technique

In the Long Term Evolution (LTE) system, the same-frequency network will have the same-frequency interference from the neighboring cell at the cell edge. To solve this problem, in the interference scenario, the user equipment (User Equipment, UE) The interference suppression combining (MMSE-IRC) algorithm based on the minimum mean square error criterion is turned on to improve the detection performance.

Assuming that the number of the serving cell is i, in the scenario where there is no neighboring interference, the transmission model of the multi-antenna system can generally be expressed by formula (1):

y=H _i s _i +n (1)

Where y denotes a received vector; H _i denotes a channel matrix, which is an N×M matrix, N denotes the number of receiving antennas, M denotes the number of transmitting antennas; s _i denotes a transmitted constellation symbol vector; n∈CN(0, σ ² I ) represents a white noise vector.

Assuming that there are a total of K cells including the serving cell, cell i is the serving cell, and other K-1 are the interfering cells, the transmission model can be expressed by formula (2):

Where I represents the signal of the interfering cell.

In the scenario where there is no neighborhood interference, the minimum mean square error (MMSE) detection algorithm is adopted, and the equalization vector of MMSE is represented by formula (3):

w=(H ^H H+σ ² I _M ) ^-1 H ^H (3)

In the case of neighboring area interference, the MMSE-IRC detection algorithm used, the equalization vector of the MMSE-IRC algorithm is represented by the formula (4):

among them,

An interference correlation matrix representing the interference signal.

Regardless of which detection algorithm is used, after the equalization vector is obtained, the equalization vector and the received signal are multiplied to obtain a vector of the decision quantity, which is expressed by the formula (5) as:

The soft bits are calculated using the obtained decision amount, and after descrambling, are sent to the decoder module.

In the actual scenario, the interference of the neighboring cell is not full bandwidth, that is, the neighboring cell interference exists on some physical resource blocks (PRBs), and the adjacent cell interference does not exist on some PRBs. In the prior art, the transmission is in the prior art. A single detection algorithm, MMSE or MMSE-IRC, on the Physical Downlink Shared Channel (PDSCH) or the Wireless Uplink Shared Channel (PUSCH) can cause system performance degradation.

Summary of the invention

The embodiments of the present invention provide a detection method and apparatus for solving the problem that a single detection algorithm is used on a PRB of a PDSCH or a PUSCH, which may cause a decrease in system performance.

The specific technical solutions provided by the embodiments of the present invention are as follows:

In a first aspect, a method of detecting is provided, comprising:

Determining a physical resource block with interference in the scheduled physical resource and a physical resource block having no interference;

And determining, by using a detection algorithm that does not interfere with the interference, a first decision amount, and determining, according to the first decision quantity, a first soft bit sequence, where the physical resource block with interference exists, Calculating a second decision amount by using a detection algorithm that processes the interference, and determining a second soft bit sequence according to the second decision amount;

A detection result is determined according to the first soft bit sequence and the second soft bit sequence.

Preferably, determining the detection result according to the first soft bit sequence and the second soft bit sequence comprises:

Adjusting, by using a preset weight value, an amplitude of each soft bit in the first soft bit sequence to obtain an adjusted soft bit sequence;

The detection result is obtained based on the adjusted soft bit sequence and the second soft bit sequence.

In implementation, the preset weight value is greater than 1.

Preferably, the preset weight value is 10.

Specifically, determining a physical resource block that has interference in the scheduled physical resource and a physical resource block that does not have interference, including:

For each physical resource block in the scheduled physical resource:

Subtracting the noise variance from each element on the main diagonal of the interference correlation matrix corresponding to the physical resource block to obtain a modified interference correlation matrix;

Calculating a sum of elements on the main diagonal of the modified interference correlation matrix, determining whether the obtained sum value is greater than a preset threshold, and if so, determining that the physical resource block is a physical resource block with interference, otherwise And determining that the physical resource block is a physical resource block that does not have interference.

In a second aspect, a detection apparatus is provided, comprising:

a distinguishing module, configured to determine a physical resource block that has interference in the scheduled physical resource and a physical resource block that does not have interference;

a detecting module, configured to calculate, by using a detection algorithm that does not interfere with the interference, a first decision quantity, and determine a first soft bit sequence according to the first decision quantity, and the interference is performed on the physical resource block that does not have interference a physical resource block, using a detection algorithm that processes the interference to calculate a second decision quantity, and determining a second soft bit sequence according to the second decision quantity;

And a determining module, configured to determine a detection result according to the first soft bit sequence and the second soft bit sequence.

Preferably, the determining module is specifically configured to:

In implementation, the preset weight value is greater than 1.

Preferably, the preset weight value is 10.

Specifically, the distinguishing module is specifically configured to:

For each physical resource block in the scheduled physical resource:

Based on the foregoing technical solution, in the embodiment of the present invention, the physical resource block that interferes with the scheduled physical resource and the physical resource block that does not have interference are used, and the physical resource block that does not have interference is calculated by using a detection algorithm that does not process the interference. Obtaining a first decision quantity, determining a first soft bit sequence according to the first decision quantity, calculating, by using a detection algorithm that processes the interference, obtaining a second decision quantity, and determining a second soft quantity according to the second decision quantity The bit sequence determines the detection result based on the first soft bit sequence and the second soft bit sequence, so that the detection algorithm can be adaptively selected according to the interference condition, and the detection accuracy and system performance are improved without increasing the complexity of the algorithm. .

DRAWINGS

1 is a schematic flow chart of a detailed method for signal detection according to an embodiment of the present invention;

2 is a schematic diagram of a signal detection process according to an embodiment of the present invention;

3 is a schematic structural diagram of a detecting device according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings, in which FIG. 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 the embodiment of the present invention, as shown in FIG. 1 and FIG. 2, the detailed method of signal detection is as follows:

Step 101: Determine a physical resource block that has interference in the scheduled physical resource and a physical resource block that does not have interference.

In the specific implementation, the following process is performed for each physical resource block in the physical resource scheduled for the UE, and it is determined whether there is interference, as follows:

Calculating the sum of the elements on the main diagonal of the corrected interference correlation matrix, determining whether the obtained sum value is greater than a preset threshold, and if so, determining that the physical resource block has interference; otherwise, determining that the physical resource block is not There is interference.

Specifically, the following process is performed for each PRB of the serving cell:

The interference correlation matrix R _e calculated on the PRB minus the noise variance matrix σ ² I to correct the interference correlation matrix, that is, subtracting the noise variance for each element on the main diagonal of the interference correlation matrix, and obtaining the corrected interference Correlation matrix

Calculate the sum of the values of the elements on the main diagonal in the modified interference correlation matrix matrix, expressed by equation (6):

P _I = trace(R _e -σ ² I) (6)

If P _{I is} greater than the preset threshold TH, it is considered that there is interference on the PRB, otherwise it is considered that there is no interference on the PRB.

If there is interference on at least one PRB in the PRB scheduled by the serving cell to the UE, the neighboring cell interference exists on the serving cell.

Step 102: For a PRB that does not have interference, use a detection algorithm that does not process the interference to calculate a first decision quantity, determine a first soft bit sequence according to the first decision quantity, and use interference processing on the PRB with interference. The detection algorithm calculates a second decision amount, and determines a second soft bit sequence based on the second decision amount.

In the embodiment of the present invention, the soft bits are values for indicating the polarity and accuracy of each bit. In a system using channel coding techniques, a soft bit input decoder for channel coding is used for decoding to obtain a corresponding signal.

Wherein, the first soft bit sequence is composed of a plurality of soft bits, and the second soft bit sequence is composed of a plurality of soft bits.

In the embodiment of the present invention, the detection algorithm that does not process the interference includes but is not limited to the MMSE detection algorithm and the zero-forcing detection algorithm (ZF), and the present invention is also included for other detection algorithms that do not process the interference.

Detection algorithms for processing interference include, but are not limited to, MMSE-IRC detection algorithms, interference suppression combining (ZF-IRC) detection algorithms based on zero-forcing criteria, and the present invention is also included for other algorithms for processing interference.

Preferably, when the detection algorithm that does not process the interference is MMSE, the detection algorithm for processing the interference adopts the MMSE-IRC detection algorithm; and when the detection algorithm that does not process the interference is the ZF detection algorithm, the detection algorithm for processing the interference The ZF-IRC detection algorithm is used.

Specifically, the detection algorithm that does not process the interference is MMSE, and the detection algorithm that processes the interference uses the MMSE-IRC detection algorithm as an example, and the first equalization vector is obtained by using the MMSE detection algorithm for the PRB without interference. The equalization vector is multiplied by the received signal corresponding to the PRB without interference, and the first decision amount is obtained;

The MMSE-IRC detection algorithm is used to obtain the second equalization vector for the PRB with interference, and the second equalization vector is multiplied by the received signal corresponding to the PRB with interference to obtain a second decision amount.

It should be noted that, only the MMSE in the specific implementation needs to be replaced with another detection algorithm that does not process the interference, and the MMSE-IRC is replaced with another detection algorithm that processes the interference, so that the corresponding decision amount can be obtained.

In the embodiment of the present invention, the soft bit sequence corresponding to the judgment amount can be obtained by calculating the distance between the judgment points and the constellation points corresponding to the modulation mode used for transmission.

The specific instructions are as follows:

It is assumed that the serving cell schedules P PRBs for the UE, wherein the PRBs of subscripts 1 to Q are not interfered by neighboring cells, and the PRBs with subscripts of Q+1 to P are interfered by neighboring cells, where Q is greater than 1. And a positive integer less than P.

The UE obtains a first equalization vector by using an MMSE detection algorithm on each RE of the PRBs of the subscripts 1 to Q, and multiplies the first equalization vector by the received signal of the corresponding RE to obtain a first determination amount, according to the first determination amount. The calculated first soft bit sequence is represented as L _MMSE ;

The UE calculates the second equalization vector by using the MMSE-IRC algorithm on each RE on the PRB subscripted as Q+1 to P, and respectively multiplies the second equalization vector by the corresponding RE of the PRB marked as Q+1 to P. The received signal obtains a second decision amount, and the second soft bit sequence calculated according to the second decision amount is represented as L _MMSE-IRC .

Step 103: Determine a detection result according to the first soft bit sequence and the second soft bit sequence.

Preferably, after the amplitude of each soft bit in the first soft bit sequence is adjusted by using a preset weight value, the detection result is obtained based on the adjusted soft bit sequence and the second soft bit sequence.

Specifically, the adjusted soft bit sequence and the second soft bit sequence are descrambled and decoded to obtain a final detection result.

The process of descrambling and decoding the soft bit sequence to obtain the detection result is not the content of the present invention. The present invention does not limit this. The present invention can be implemented by referring to the existing descrambling and decoding process. Let me repeat.

The specific instructions are as follows:

The first soft bit sequence L _MMSE is amplitude-amplified by α times, wherein α is greater than 1, and α·L _MMSE and L _{MMSE-IRC are} combined and input to the descrambler, and then input to the decoder, and finally output by the decoder. Test results.

Among them, the value of α is obtained by simulating the throughput performance under different values. Generally, the values of α in different scenarios are different. A value with better performance robustness can be taken as the α value by throughput comparison.

Preferably, α takes a fixed value greater than one.

Preferably, α takes a fixed value of 10.

The signal detection process provided by the present invention is exemplified below by two specific embodiments.

First specific embodiment:

Assuming downlink transmission in an LTE system, the system bandwidth is 10 megahertz (MHz), and the UE is scheduled to transmit PDSCH data services on PRB0 to PRB5.

Assume that the number of cell-specific pilot (CRS) ports is 2, which is expressed as CFI equal to 2, and is transmitted in a regular subframe using a regular cyclic prefix (CP). The transmission mode is transmission mode 6, that is, closed-loop RANK1 transmission, and the modulation mode is Quadrature Phase Shift Keying (QPSK), a total of 792 QPSK symbols are transmitted on the transmitted 6 PRBs, for a total of 1584 bits.

The user equipment first determines whether there is interference of the interfering cell on the allocated PRB, as follows:

Subtracting the noise variance from each element on the main diagonal of the interference correlation matrix, correcting the interference correlation matrix, and calculating the sum of the elements on the main diagonal of the corrected interference correlation matrix, if the sum is greater than the preset If there is a threshold, it is considered that there is interference on the PRB, otherwise it is considered that there is no interference on the PRB.

It is assumed that the user equipment determines that the neighboring cell interference is not present in PRB0-PRB1, and the neighboring cell interference is received in PRB2-PRB5.

The user equipment performs MMSE detection on the signals on PRB0-PRB1, and performs MMSE-IRC detection on the signals of PRB2-PRB5.

MMSE detection output 528 soft bits, MMSE-IRC detection output 1056 soft bits, 528 soft bits of MMSE detection output 10 times amplification, 1056 soft bits of MMSE-IRC detection output are not amplified.

After 10 times of amplification of the 528 soft bits outputted by the MMSE detection, it is input to the decoder in combination with 1056 soft bits of the MMSE-IRC detection output, and the final detection result is obtained.

Second specific embodiment:

Assume that the uplink transmission is performed in the LTE system, the system bandwidth is 10 MHz, and the UE is scheduled to transmit the PUSCH data service on the PRB10-PRB15, and transmits in the regular subframe using the normal CP, and the modulation mode is QPSK, and the 6 transmissions are performed. 864 QPSK symbols and 1728 soft bits are transmitted on the PRB.

The base station first determines whether there is interference interference of the interfering cell user on the allocated PRB, as follows:

It is assumed that the PRB10-PRB11 is not interfered by the neighbor cell user, and the PRB12-PRB15 is interfered by the neighbor cell user.

The base station performs MMSE detection on the signals on the PRB10-PRB11, and performs MMSE-IRC detection on the signals of the PRB12-PRB15.

MMSE is used to detect and output 576 soft bits, MMSE-IRC is used to detect and output 1152 soft bits, and 576 soft bits of MMSE detection output are amplified by 10 times, and 1152 soft bits of MMSE-IRC detection output are not amplified.

After the 576 soft bits of the MMSE detection output are amplified by 10 times, they are input to the decoder in combination with the 1152 soft bits of the MMSE-IRC detection output, and the final detection result is obtained.

Based on the same inventive concept, a detection device is also provided in the embodiment of the present invention. For the specific implementation of the device, reference may be made to the description of the method in the foregoing method, and the repeated description is not repeated. As shown in FIG. 3, the device mainly includes:

The distinguishing module 301 is configured to determine a physical resource block that has interference in the scheduled physical resource and a physical resource block that does not have interference;

The detecting module 302 is configured to calculate, by using a detection algorithm that does not interfere with the physical resource block that does not have interference, a first decision amount, and determine a first soft bit sequence according to the first Interfering physical resource block, using a detection algorithm that processes the interference to calculate a second decision amount, according to the second decision amount Determining a second soft bit sequence;

The determining module 303 is configured to determine a detection result according to the first soft bit sequence and the second soft bit sequence.

Preferably, the determining module is specifically configured to:

The preset weight value is greater than 1.

Preferably, the preset weight value is 10.

Specifically, the distinguishing module is specifically configured to:

For each physical resource block in the scheduled physical resource:

Based on the same inventive concept, a user equipment is also provided in the embodiment of the present invention. For the specific implementation of the user equipment, reference may be made to the description of the foregoing method, and the repeated description is not repeated. As shown in FIG. 4, the user equipment mainly includes The processor 401 and the memory 402, wherein the memory 402 holds a preset program, and the processor 401 is configured to read a preset program in the memory 402, and execute the following process according to the program:

Preferably, the processor 401 adjusts the amplitude of each soft bit in the first soft bit sequence by using a preset weight value to obtain an adjusted soft bit sequence; based on the adjusted soft bit sequence and the second The soft bit sequence obtains the detection result.

The preset weight value is greater than 1.

Preferably, the preset weight value is 10.

Specifically, the processor 401 is directed to each of the scheduled physical resources:

4, the bus architecture can include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 401 and various circuits of memory represented by memory 402. The bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The device is implemented in a flow or a flow or a block diagram of a block or multiple The function specified in the box.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A detection method, comprising:

Determining a physical resource block with interference in the scheduled physical resource and a physical resource block having no interference;

And determining, by using a detection algorithm that does not interfere with the interference, a first decision amount, and determining, according to the first decision quantity, a first soft bit sequence, where the physical resource block with interference exists, Calculating a second decision amount by using a detection algorithm that processes the interference, and determining a second soft bit sequence according to the second decision amount;

A detection result is determined according to the first soft bit sequence and the second soft bit sequence.
The method of claim 1, wherein determining the detection result according to the first soft bit sequence and the second soft bit sequence comprises:

Adjusting, by using a preset weight value, an amplitude of each soft bit in the first soft bit sequence to obtain an adjusted soft bit sequence;

The detection result is obtained based on the adjusted soft bit sequence and the second soft bit sequence.
The method of claim 2 wherein said predetermined weight value is greater than one.
The method of claim 3 wherein said predetermined weight value is 10.
The method according to any one of claims 1 to 4, wherein determining the physical resource block in which the interference is present in the scheduled physical resource and the physical resource block in which the interference does not exist includes:

For each physical resource block in the scheduled physical resource:

Subtracting the noise variance from each element on the main diagonal of the interference correlation matrix corresponding to the physical resource block to obtain a modified interference correlation matrix;

Calculating a sum of elements on the main diagonal of the modified interference correlation matrix, determining whether the obtained sum value is greater than a preset threshold, and if so, determining that the physical resource block is a physical resource block with interference, otherwise And determining that the physical resource block is a physical resource block that does not have interference.
A detecting device, comprising:

a distinguishing module, configured to determine a physical resource block that has interference in the scheduled physical resource and a physical resource block that does not have interference;

a detecting module, configured to calculate, by using a detection algorithm that does not interfere with the interference, a first decision quantity, and determine a first soft bit sequence according to the first decision quantity, and the interference is performed on the physical resource block that does not have interference a physical resource block, using a detection algorithm that processes the interference to calculate a second decision quantity, and determining a second soft bit sequence according to the second decision quantity;

And a determining module, configured to determine a detection result according to the first soft bit sequence and the second soft bit sequence.
The device according to claim 6, wherein the determining module is specifically configured to:

Adjusting, by using a preset weight value, an amplitude of each soft bit in the first soft bit sequence to obtain an adjusted soft bit sequence;

The detection result is obtained based on the adjusted soft bit sequence and the second soft bit sequence.
The apparatus of claim 7 wherein said predetermined weight value is greater than one.
The apparatus of claim 8 wherein said predetermined weight value is 10.
The device according to any one of claims 6-9, wherein the distinguishing module is specifically configured to:

For each physical resource block in the scheduled physical resource:

Subtracting the noise variance from each element on the main diagonal of the interference correlation matrix corresponding to the physical resource block to obtain a modified interference correlation matrix;

Calculating a sum of elements on the main diagonal of the modified interference correlation matrix, determining whether the obtained sum value is greater than a preset threshold, and if so, determining that the physical resource block is a physical resource block with interference, otherwise And determining that the physical resource block is a physical resource block that does not have interference.