CN109150386B - User terminal, serving cell demodulation method, storage medium, and electronic device - Google Patents

User terminal, serving cell demodulation method, storage medium, and electronic device Download PDF

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CN109150386B
CN109150386B CN201710507184.4A CN201710507184A CN109150386B CN 109150386 B CN109150386 B CN 109150386B CN 201710507184 A CN201710507184 A CN 201710507184A CN 109150386 B CN109150386 B CN 109150386B
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resource block
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current
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transmission mode
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CN109150386A (en
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余辉
裴新欣
王达金
严伟
李俊强
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Spreadtrum Communications Shanghai Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0047—Decoding adapted to other signal detection operation
    • H04L1/0048—Decoding adapted to other signal detection operation in conjunction with detection of multiuser or interfering signals, e.g. iteration between CDMA or MIMO detector and FEC decoder
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0059—Out-of-cell user aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0045—Arrangements at the receiver end
    • H04L1/0054—Maximum-likelihood or sequential decoding, e.g. Viterbi, Fano, ZJ algorithms

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Abstract

A user terminal, a serving cell demodulation method, a storage medium and an electronic device are provided, the method includes: traversing all resource elements corresponding to a current symbol on a current physical resource block; determining an interference cell parameter corresponding to a current symbol on the current physical resource block; and calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the determined interference cell parameters. The scheme can reduce the data storage space occupied by the serving cell during demodulation.

Description

User terminal, serving cell demodulation method, storage medium, and electronic device
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a user terminal, a serving cell demodulation method, a storage medium, and an electronic device.
Background
The 3GPP introduces a Network Assisted Interference Cancellation and Suppression (NAICS) technology, and the base station issues interfering cell parameters to the ue through broadcasting, dedicated signaling, or Downlink Control Information (DCI). The interfering cell parameters include a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Modulation type (MOD) of the neighboring cell. Under the condition that the parameters of the interference cell are known, the User Equipment (UE) performs corresponding processing operations on the received signal, so that the performance of the communication system can be obviously improved.
However, the successful application of the NAICS technology depends on RI, PMI and MOD configured by the base station of the neighboring cell, which may limit the scheduling flexibility of the base station of the neighboring cell. Furthermore, the backhaul capacity between base stations and the base station to UE capacity are typically limited. Therefore, in the prior art, the UE performs interfering cell parameter detection according to the received signal, and blindly estimates interfering cell parameters from the received signal.
In practical applications, in order to reduce the computational complexity, the detection of the interfering cell parameter is usually combined with the demodulation of the serving cell to perform the operation. Firstly, determining interference cell parameters from each group of interference cell parameter combinations, and then calculating by addition and subtraction operation to obtain the demodulation log-likelihood ratio of the service cell.
To reduce the computational complexity, the Resource Elements (REs) are usually demodulated according to the mapping order of the Physical Downlink Shared Channel (PDSCH). In addition, in order to provide the accuracy of the interfering cell parameter detection, the interfering cell parameter detection is performed by using as many effective REs in one physical resource block as possible. Because the calculation data of each interference cell parameter combination on each RE needs to be stored while the interference cell parameter detection is performed, and the output sequence of the demodulation log-likelihood ratio of the serving cell is that the demodulation log-likelihood ratio of the serving cell can be output after the time domain is performed first and then the frequency domain is performed and the interference cell parameter of one physical resource block is determined, the demodulation log-likelihood ratio of the serving cell is output after the interference cell parameter detection on all the physical resource blocks is completed. In this process, the calculation data of each interfering cell parameter combination on all allocated REs needs to be stored, and a large storage space is occupied.
Disclosure of Invention
The embodiment of the invention solves the problem of reducing the data storage space occupied by the demodulation of the serving cell.
To solve the foregoing technical problem, an embodiment of the present invention provides a serving cell demodulation method, including: traversing all resource elements corresponding to a current symbol on a current physical resource block; determining an interference cell parameter corresponding to a current symbol on the current physical resource block; and calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the determined interference cell parameters.
Optionally, the determining the interfering cell parameter corresponding to the current symbol on the current physical resource block includes: calculating reliability measurement values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset interference cell parameter combination; and selecting the interference cell parameter combination corresponding to the minimum reliability metric value as the interference cell parameter corresponding to the current symbol on the current physical resource block.
Optionally, the following formula is adopted to calculate the reliability metric values corresponding to all resource elements corresponding to the current symbol on the current physical resource block under each preset set of interference cell parameter combination:
Figure BDA0001334931930000021
where m denotes the current physical resource block, n denotes the current symbol on the current physical resource block, Metricm,n,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the current symbol on the current physical resource block; metricm,n-1,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the (n-1) th symbol on the current physical resource block; k belongs to (m, n) and represents all resource elements corresponding to the current symbol on the current physical resource block; r iskA signal vector received for a kth RE in a current symbol on a current physical resource block; rhoSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001334931930000022
to estimate the channel matrix of the serving cell,
Figure BDA0001334931930000023
a precoding matrix for the serving cell,
Figure BDA0001334931930000024
a data signal transmitted for a serving cell; rhoIThe ratio of the RE transmitting power corresponding to the data signal of the interference cell to the RE transmitting power corresponding to the dedicated reference signal is obtained;
Figure BDA0001334931930000025
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001334931930000031
a precoding matrix with index i for the interfering cell,
Figure BDA0001334931930000032
is a data signal transmitted by an interfering cell.
Optionally, the interfering cell parameter includes: the transmission mode of the interfering cell.
Optionally, the determining the interfering cell parameter corresponding to the current symbol on the current physical resource block includes: when n is less than or equal to j, setting the transmission mode of the interference cell as a first transmission mode, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is a first transmission mode, setting the transmission mode of the interference cell as the first transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is not the first transmission mode, setting the transmission mode of the interference cell as the second transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; the first transmission mode is different from the second transmission mode, N is an identifier corresponding to a current symbol, j is a preset numerical value, j is more than or equal to 1 and less than or equal to N, and N is the total number of symbols of the downlink subframe.
Optionally, the first transmission mode is a Rank1 transmission mode, and the second transmission mode is an SFBC transmission mode.
Optionally, when the first transmission mode is a Rank1 transmission mode, after calculating a demodulation log-likelihood ratio of a serving cell corresponding to a current symbol on a current physical resource block, the method further includes: and calibrating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block.
Optionally, the calibrating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block includes: calculating a reliability metric value corresponding to a current symbol on the current physical resource block; acquiring a first weighting coefficient corresponding to a reliability metric value corresponding to a current symbol on the current physical resource block; multiplying the first weighting coefficient by a demodulation log-likelihood ratio corresponding to a current symbol on the current physical resource block to obtain a first product; multiplying the second weighting coefficient by the output log-likelihood ratio of the preset receiver to obtain a second product; adding the first product and the second product to obtain a sum value which is used as a demodulation log-likelihood ratio of a service cell corresponding to a current symbol on a current physical resource block after calibration; wherein the sum of the first weighting coefficient and the second weighting coefficient is 1.
Optionally, the interfering cell parameter includes: modulation type of the interfering cell.
Optionally, the calculating a demodulation log-likelihood ratio of a serving cell corresponding to a current symbol on a current physical resource block includes: and calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the modulation type corresponding to the symbol before the current symbol on the current physical resource block.
An embodiment of the present invention further provides a user terminal, including: the traversing unit is used for traversing all resource elements corresponding to the current symbol on the current physical resource block; an interfering cell parameter determining unit, configured to determine an interfering cell parameter corresponding to the current symbol on the current physical resource block; and the calculating unit is used for calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the determined interference cell parameters.
Optionally, the interfering cell parameter determining unit is configured to calculate reliability metric values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset group of interfering cell parameter combinations; and selecting the interference cell parameter combination corresponding to the minimum reliability metric value as the interference cell parameter corresponding to the current symbol on the current physical resource block.
Optionally, the interfering cell parameter determining unit is configured to calculate, by using the following formula, reliability metric values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset group of interfering cell parameter combinations:
Figure BDA0001334931930000041
where m denotes the current physical resource block, n denotes the current symbol on the physical resource block, Metricm,n,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the current symbol on the current physical resource block; metricm,n-1,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the (n-1) th symbol on the current physical resource block, wherein the (n-1) th symbol is the previous symbol of the current symbol; k belongs to (m, n) and represents all resource elements corresponding to the current symbol on the current physical resource block; r iskA signal vector received for a kth RE in a current symbol on a current physical resource block; rhoSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001334931930000042
for estimated channel moment of serving cellThe number of the arrays is determined,
Figure BDA0001334931930000043
a precoding matrix for the serving cell,
Figure BDA0001334931930000044
a data signal transmitted for a serving cell; rhoIThe ratio of the RE transmitting power corresponding to the data signal of the interference cell to the RE transmitting power corresponding to the dedicated reference signal is obtained;
Figure BDA0001334931930000045
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001334931930000046
a precoding matrix with index i for the interfering cell,
Figure BDA0001334931930000047
is a data signal transmitted by an interfering cell.
Optionally, the interfering cell parameter includes: the transmission mode of the interfering cell.
Optionally, the interfering cell parameter determining unit is configured to set a transmission mode of the interfering cell as a first transmission mode when n is less than or equal to j, and determine other cell parameters corresponding to a current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is a first transmission mode, setting the transmission mode of the interference cell as the first transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is not the first transmission mode, setting the transmission mode of the interference cell as the second transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; the first transmission mode is different from the second transmission mode, N is an identifier corresponding to a current symbol, j is a preset numerical value, j is more than or equal to 1 and less than or equal to N, and N is the total number of symbols of the downlink subframe.
Optionally, the first transmission mode is a Rank1 transmission mode, and the second transmission mode is an SFBC transmission mode.
Optionally, the user terminal further includes: a calibrating unit, configured to, when the first transmission mode is a Rank1 transmission mode, calibrate the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block after calculating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block.
Optionally, the calibration unit is configured to calculate a reliability metric value corresponding to a current symbol on the current physical resource block; acquiring a first weighting coefficient corresponding to a reliability metric value corresponding to a current symbol on the current physical resource block; multiplying the first weighting coefficient by a demodulation log-likelihood ratio corresponding to a current symbol on the current physical resource block to obtain a first product; multiplying the second weighting coefficient by the output log-likelihood ratio of the preset receiver to obtain a second product; adding the first product and the second product to obtain a sum value which is used as a demodulation log-likelihood ratio of a service cell corresponding to a current symbol on a current physical resource block after calibration; wherein the sum of the first weighting coefficient and the second weighting coefficient is 1.
Optionally, the interfering cell parameter includes: modulation type of the interfering cell.
Optionally, the calculating unit is configured to calculate a demodulation log-likelihood ratio of a serving cell corresponding to a current symbol on the current physical resource block according to a modulation type corresponding to a symbol before the current symbol on the current physical resource block.
The embodiment of the present invention further provides a computer-readable storage medium, on which a computer instruction is stored, and when the computer instruction runs, the method for demodulating a serving cell according to any of the above methods is performed.
The embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes any one of the serving cell demodulation methods when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
and traversing all resource elements corresponding to the current symbol on the current physical resource block to determine the interference cell parameter corresponding to the current symbol on the current physical resource block. After determining the interference cell parameter corresponding to the current symbol of the current physical resource block, the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block is directly calculated, so that the calculation data of a plurality of interference cell parameter combinations on all the allocated resource elements is not required to be stored, and the data storage space occupied by the service cell during demodulation is greatly reduced.
Furthermore, on the current physical resource block, the transmission mode of the interfering cell in the interfering cell parameters of the first j symbols is set as the first transmission mode, the transmission mode of the interfering cell in the interfering cell parameters of other symbols is set as the second transmission mode, and the first transmission mode is different from the second transmission mode, so that the interfering cell parameter detection only needs to be performed on one transmission mode, and not all transmission modes need to be traversed on the first j symbols, and therefore, the calculation complexity of the interfering cell parameter detection can be further reduced.
Further, when the transmission mode of the interfering cell in the interfering cell parameters of the first j symbols is set as the first transmission mode, after the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block is obtained through calculation, the obtained demodulation log-likelihood ratio of the serving cell is calibrated, so that the demodulation performance loss of the serving cell is reduced.
In addition, aiming at the current symbol on the current physical resource block, the modulation type corresponding to the current symbol is set to be the same as the modulation type corresponding to the previous symbol, so that only one kind of calculation data corresponding to the modulation type needs to be stored, and the calculation data corresponding to multiple modulation types does not need to be stored, so that the data storage space occupied by the service cell during demodulation can be further reduced.
Drawings
Fig. 1 is a flowchart of a serving cell demodulation method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a user terminal in an embodiment of the present invention.
Detailed Description
In practical application, a signal vector received by the user terminal on the kth Resource Element (RE) is rk，rkCan be represented by the following formula (1):
Figure BDA0001334931930000071
in the formula (1), the reaction mixture is,
Figure BDA0001334931930000072
representing an effective channel matrix corresponding to a serving cell corresponding to the kth RE, wherein the effective channel matrix comprises an actual channel matrix and a precoding matrix;
Figure BDA0001334931930000073
a signal of a serving cell corresponding to a kth RE;
Figure BDA0001334931930000074
representing the effective channel matrix corresponding to the interference cell corresponding to the kth RE;
Figure BDA0001334931930000075
a signal of an interference cell corresponding to a kth RE; n iskA noise signal corresponding to the k-th RE, and nkIs variance of
Figure BDA00013349319300000711
The additive noise vector of the complex number Gaussian elements which are independently and identically distributed; k is more than or equal to 1 and less than or equal to K, and K is the number of REs required for executing blind detection estimation of the interference cell.
In LTE systems, a mobile terminal typically estimates the channel of a serving Cell using a pilot signal, which may be a Cell-specific Reference signal (CRS). Is estimated toChannel matrix to serving cell is
Figure BDA0001334931930000076
The estimated channel matrix of the interfering cell is
Figure BDA0001334931930000077
The above formula (1) can be represented as the following formula (2):
Figure BDA0001334931930000078
where ρ isSIs the ratio of the traffic signal transmit power to the pilot signal transmit power, ρ, of the serving cellIIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the interfering cell. RhoSAlso called the Traffic To Pilot Ratio (TPR), ρ of the serving cellIIs a TPR which may also be referred to as an interfering cell.
Figure BDA0001334931930000079
A precoding matrix for a serving cell corresponding to a kth RE,
Figure BDA00013349319300000710
and the precoding matrix is the precoding matrix of the interference cell corresponding to the kth RE.
The TPR of the serving cell and the TPR of the interfering cell are given by a function of two TPR parameters formulated in the 3GPP LTE system according to the RE position with respect to an Orthogonal Frequency Division Multiplexing (OFDM) index within a Transmission Time Interval (TTI).
In order to overcome the cell scheduling limitation and the network signaling overhead, the UE may blindly estimate the interfering cell parameters from the received signal, where the interfering cell parameters include neighboring cells RI, PMI, MOD, TPR of the interfering cell, and the like.
The user terminal performs joint blind detection on the interfering cell to acquire the PMI, MOD and TPR of the interfering cell. In the prior art, the following formula (3) is usually adopted to obtain the interfering cell parameter of the interfering cell on the kth RE:
Figure BDA0001334931930000081
in the formula (3), the reaction mixture is,
Figure BDA0001334931930000082
the modulation type of the serving cell corresponding to the kth RE,
Figure BDA0001334931930000083
the modulation type of the interfering cell corresponding to the kth RE. In the formula (3), ρS、
Figure BDA0001334931930000084
And
Figure BDA0001334931930000085
all can be issued to the user terminal by the serving cell through network signaling, that is, rhoS、
Figure BDA0001334931930000086
And
Figure BDA0001334931930000087
are known. Thus, the physical meaning of equation (3) can be expressed as: selecting the formula
Figure BDA0001334931930000088
Is smallest value ρI、
Figure BDA0001334931930000089
And
Figure BDA00013349319300000810
as an interfering cell parameter for interfering cells on the kth RE.
In practical applications, when calculating equation (3), ρ is usually traversedI、
Figure BDA00013349319300000811
And
Figure BDA00013349319300000812
to obtain EDk。
After determining the interfering cell parameters corresponding to the interfering cell transmission signal, the demodulated soft bit output based on a Maximum Likelihood (ML) algorithm may be represented as:
Figure BDA00013349319300000813
wherein the content of the first and second substances,
Figure BDA00013349319300000814
is nkPower of, LLRk,mSoft bit value, C, corresponding to the mth bit received on the kth RES,m＝xWhen the m-th bit takes the value of x
Figure BDA00013349319300000815
And x is 0 or 1.
As can be seen from the above equations (3) and (4), when performing the interfering cell parameter detection and the serving cell demodulation, the following equations need to be calculated:
Figure BDA00013349319300000816
in order to reduce the computational complexity, the detection of the interfering cell parameters is usually combined with the demodulation of the serving cell, that is, the ED value corresponding to each RE combined with each interfering cell parameter is stored when the detection of the interfering cell parameters is performed. After the parameters of the interference cell are determined, the soft bit value of the serving cell, that is, the demodulation log-likelihood ratio of the serving cell, can be obtained through simple addition and subtraction.
In the prior art, the REs are usually demodulated according to the mapping order of the PDSCH, that is, when the REs are demodulated, the order of the frequency domain first and the time domain second is adopted. Meanwhile, in order to improve the accuracy of detecting the interfering cell parameters, it is necessary to detect the interfering cell by using the effective REs in one RB as much as possible. Because the ED values of the interference cell parameter combinations corresponding to each RE need to be stored when the interference cell parameter detection is performed, and the output sequence of the demodulated LLRs is frequency domain first and then time domain, and the LLRs need to be output after the interference cell parameters of the corresponding RB are determined, the LLRs need to be output after the interference cell parameter detection corresponding to all allocated RBs is completed, the ED values of the interference cell parameter combinations corresponding to all allocated REs need to be stored, and a large storage space is occupied.
In the embodiment of the present invention, all resource elements corresponding to the current symbol on the current RB are traversed first to determine an interfering cell parameter corresponding to the current symbol on the current RB. After determining the parameters of the interference cell corresponding to the current symbol of the current RB, the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current RB is directly calculated, so that the ED values of a plurality of interference cell parameter combinations on all allocated REs are not required to be stored, and the storage space is greatly reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the present invention provides a serving cell demodulation method, which is described in detail below with reference to fig. 1 in conjunction with specific steps.
Step S101, traversing all resource elements corresponding to the current symbol on the current physical resource block.
In a specific implementation, when performing the interfering cell parameter detection and the serving cell demodulation operation, all resource elements corresponding to the current symbol on the current RB may be traversed first. That is, in the embodiment of the present invention, all REs in one symbol on one physical resource block are traversed in units of symbols.
After traversing all resource elements corresponding to the current symbol on the current physical resource block, step S102 is executed.
Step S102, determining the interference cell parameter corresponding to the current symbol on the current physical resource block.
In practical applications, there may be multiple sets of interfering cell parameter combinations. Therefore, the interfering cell parameter corresponding to the current symbol on the current physical resource block can be selected from the multiple groups of interfering cell parameter combinations.
In a specific implementation, the reliability metric values corresponding to all REs corresponding to the current symbol on the current physical resource block under each preset set of interfering cell parameter combinations may be calculated. And after the reliability metric values corresponding to all the interference cell parameter combinations are obtained, selecting the minimum reliability metric value from the reliability metric values, and taking the interference cell parameter combination corresponding to the minimum reliability metric value as the interference cell parameter corresponding to the current symbol on the current physical resource block.
In the embodiment of the present invention, the current physical resource block is set as the mth physical resource block, and the current symbol is the nth symbol on the mth physical resource block, and the reliability metric corresponding to each set of interference cell parameter combination may be calculated by using the following formula:
Figure BDA0001334931930000101
wherein Metricm,n,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the current symbol on the current physical resource block; metricm,n-1,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the (n-1) th symbol on the current physical resource block, wherein the (n-1) th symbol is the previous symbol of the current symbol; k ∈ (m, n) is expressed as all REs corresponding to the current symbol on the current physical resource block.
After obtaining the reliability metric values corresponding to the interference cell parameters corresponding to the current symbol on the current physical resource block under each set of interference cell parameter combinations, the minimum reliability metric value can be selected from the reliability metric values corresponding to all interference cell parameter combinations.
In an implementation, the minimum reliability metric may be selected using the following equation (7):
Figure BDA0001334931930000102
wherein the content of the first and second substances,
Figure BDA0001334931930000103
to take Metricm,n,iThe minimum reliability metric value selected is the q-th group of interference cell parameter combinations, in other words, the interference cell parameter corresponding to the current symbol on the current physical resource block is the parameter corresponding to the q-th group of interference cell parameter combinations.
Step S103, according to the determined interference cell parameter, calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block.
In a specific implementation, after determining the interfering cell parameter, the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block may be calculated by using equation (4) above.
Therefore, in the embodiment of the present invention, when performing interference cell detection, only the ED values corresponding to all REs in one symbol of each set of interference cell parameter combination on one physical resource block need to be stored, and the demodulation log-likelihood ratio corresponding to the serving cell can be calculated and output, so that only a small storage space is needed, and the ED values of all interference cell parameters on all physical resource blocks do not need to be stored, thereby greatly reducing the required storage space.
In the LTE system, defining a CRS-related Transmission Mode (TM) includes: 1) TM 1: a single antenna port; 2) TM2/3, transmission Diversity for rank1, and Large Delay Cyclic Diversity (LCDD) for rank 2; 3) TM 4/6: rank1 or rank2 precoding based on 2/4CRS ports.
All CRS based TM specified for LTE systems can be divided into 3 transmission formats: 1) rank1 transmission mode, which can be regarded as a special form with a precoding matrix of 1, or Rank1 precoding in TM 4/6; 2) a Rank2 transmission mode, TM2/3LCDD, TM4/6 Rank2 precoding; 3) SFBC transmission mode, TM2/3 transmission diversity.
From the above, if p is traversedI、
Figure BDA0001334931930000111
And
Figure BDA0001334931930000112
is too complex to compute.
In the embodiment of the present invention, in order to reduce the computational complexity, when determining the interfering cell parameter corresponding to the current symbol on the current physical resource block, the current symbol on the current physical resource block may be first set as the nth symbol on the mth physical resource block, N is set as the total number of symbols of the downlink subframe, and j is greater than or equal to 1 and less than or equal to N, and a preset value j is set. If n is less than or equal to j, the transmission mode of the interference cell in the interference cell parameters can be set as a first transmission mode, and the precoding matrix and the rho corresponding to the interference cell are determined in the first transmission modeIAnd
Figure BDA0001334931930000113
when n is equal to j, the transmission modes of the interference cells are the first transmission mode, the transmission mode of the interference cell is still set to be the first transmission mode when n is larger than j, and the precoding matrix and the rho corresponding to the interference cell are continuously determined in the first transmission modeIAnd
Figure BDA0001334931930000114
when n is equal to j, the transmission modes of the interference cells are not the first transmission mode, the transmission mode of the interference cells is set to be the second transmission mode when n is larger than j, and the precoding matrix and the rho corresponding to the interference cells are determined in the second transmission modeIAnd
Figure BDA0001334931930000115
that is to say, in the embodiment of the present invention, it is not necessary to traverse all transmission modes, and the first j symbols are directly set for the first j symbols on the current physical resource blockThe transmission mode of the interference cell in the interference cell parameter corresponding to the number is the first transmission mode, and at this time, only the precoding matrix corresponding to the first transmission mode needs to be determined
Figure BDA0001334931930000116
And traverse all ρIAnd
Figure BDA0001334931930000117
and (4) finishing. When detecting that the transmission mode of the interference cell corresponding to the jth symbol is the first transmission mode, setting the transmission mode of the interference cell to be the first transmission mode when n is larger than j, and determining a precoding matrix corresponding to the first transmission mode
Figure BDA0001334931930000121
And traverse all ρIAnd
Figure BDA0001334931930000122
i.e. without traversing all transmission modes. When detecting that the transmission mode of the interference cell corresponding to the jth symbol is not the first transmission mode, setting the transmission mode of the interference cell with n being larger than j as the second transmission mode, and determining a precoding matrix corresponding to the second transmission mode
Figure BDA0001334931930000123
And traverse all ρIAnd
Figure BDA0001334931930000124
i.e. without traversing all transmission modes. Therefore, the precoding matrix corresponding to the interference cell is determined after the transmission mode of the interference cell is set
Figure BDA0001334931930000125
And ρIAnd
Figure BDA0001334931930000126
and all transmission modes do not need to be traversed, so that the calculation complexity of the interference cell parameter detection can be reduced.
In practical application, the modulation type of the interference cell transmission symbol
Figure BDA0001334931930000127
Including QPSK, 16QAM, 64QAM, and 256 QAM. In the prior art, each symbol on each physical resource block needs to store the ED values of the above four possible modulation types combined with other interfering cell parameters on each RE, and a large storage space is also occupied.
As known in the art, the interfering cell parameters include modulation type, ρIAnd
Figure BDA0001334931930000128
therefore, each symbol on each physical resource block needs to store different ρ when the modulation type is QPSKIAnd
Figure BDA0001334931930000129
ED value and different rho when modulation type is 16QAM on each REIAnd
Figure BDA00013349319300001210
ED value and different rho when modulation type is 64QAM on each REIAnd
Figure BDA00013349319300001211
ED value and ρ different when modulation type is 256QAM on each REIAnd
Figure BDA00013349319300001212
ED value on each RE.
In the embodiment of the present invention, to further reduce the requirement on the storage space, only the ED value corresponding to one modulation type is stored for each symbol on each physical resource block. For a current symbol on a current physical resource block, a modulation type corresponding to the current symbol is a modulation type corresponding to a symbol previous to the current symbol.
For example, if the modulation type corresponding to the symbol before the current symbol on the current physical resource block is 16QAM, the modulation type corresponding to the current symbol on the current physical resource block is set to be 16 QAM. When calculating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block, the modulation type is 16QAM for calculation, so that only the ED value corresponding to the modulation type 16QAM needs to be stored.
Therefore, in the embodiment of the present invention, the ED value corresponding to only one modulation type is stored, instead of the ED values corresponding to four modulation types, so that the requirement for storage space can be further reduced.
In the specific implementation, since in the above embodiment of the present invention, the detection of the parameters of the interfering cell is performed only once on each symbol on each physical resource block, and the detection is performed only on the first several symbols of each physical resource block based on the transmission mode of the interfering cell as the Rank1 transmission mode, the actual transmission mode of several interfering cells is the Rank2 transmission mode or the SFBC transmission mode, which may result in a large loss of system performance.
In the embodiment of the present invention, in order to reduce the influence on the demodulation performance of the serving cell, after setting the first transmission mode as the Rank1 transmission mode and calculating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block, the obtained demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block may also be calibrated.
In a specific implementation, a reliability metric corresponding to a current symbol on a current physical resource block may be calculated first. And acquiring a first weighting coefficient corresponding to the reliability metric value corresponding to the current symbol on the current physical resource block. And multiplying the obtained first weighting coefficient by the reliability metric value corresponding to the current symbol on the current physical resource block, and taking the obtained product as a first product. And multiplying the second weighting coefficient by the preset output log-likelihood ratio of the receiver to obtain a second product, and adding the first product and the second product to obtain a sum, namely the calibrated demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block. The sum of the first weighting factor and the second weighting factor is 1.
In the embodiment of the present invention, the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block is calibrated by using the following formula:
LLR_Outm,n,j＝αm,n*LLR_ICm,n,j+(1-αm,n)*LLR_EIRCm,n,j； (8)
wherein, LLR _ Outm,n,jIs the demodulation log-likelihood ratio, LLR _ IC, of the serving cell corresponding to the current symbol on the current physical resource block after calibrationm,n,jThe LLR _ EIRC is the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block before calibrationm,n,jFor a predetermined output log-likelihood ratio, alpha, of the receiverm,nIs a first weighting coefficient, (1-alpha)m,n) Is a second weighting factor.
Therefore, when the transmission mode of the interference cell in the interference cell parameters of the previous j symbols is set as the first transmission mode, after the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block is obtained through calculation, the obtained demodulation log-likelihood ratio of the service cell is calibrated, and therefore the demodulation performance loss of the service cell is reduced.
Referring to fig. 2, a user terminal in the embodiment of the present invention is provided, including: traversal unit 201, interfering cell parameter determining unit 202, and calculating unit 203, wherein:
a traversing unit 201, configured to traverse all resource elements corresponding to a current symbol on a current physical resource block;
an interfering cell parameter determining unit 202, configured to determine an interfering cell parameter corresponding to the current symbol on the current physical resource block;
a calculating unit 203, configured to calculate, according to the determined interfering cell parameter, a demodulation log-likelihood ratio of a serving cell corresponding to the current symbol on the current physical resource block.
In a specific implementation, the interfering cell parameter determining unit 202 may be configured to calculate reliability metric values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset group of interfering cell parameter combinations; and selecting the interference cell parameter combination corresponding to the minimum reliability metric value as the interference cell parameter corresponding to the current symbol on the current physical resource block.
In a specific implementation, the interfering cell parameter determining unit 202 may be configured to calculate, by using the following formula, reliability metric values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset set of interfering cell parameter combinations:
Figure BDA0001334931930000141
where m denotes the current physical resource block, n denotes the current symbol on the current physical resource block, Metricm,n,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the current symbol on the current physical resource block; metricm,n-1,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the (n-1) th symbol on the current physical resource block; k belongs to (m, n) and represents all resource elements corresponding to the current symbol on the current physical resource block; r iskA signal vector received for a kth RE in a current symbol on a current physical resource block; rhoSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001334931930000142
to estimate the channel matrix of the serving cell,
Figure BDA0001334931930000143
a precoding matrix for the serving cell,
Figure BDA0001334931930000144
a data signal transmitted for a serving cell; rhoIA ratio of RE transmission power corresponding to data signal of the interference cell to RE transmission power corresponding to dedicated reference signalA value;
Figure BDA0001334931930000145
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001334931930000146
a precoding matrix with index i for the interfering cell,
Figure BDA0001334931930000147
is a data signal transmitted by an interfering cell.
In a specific implementation, the interfering cell parameter may include: the transmission mode of the interfering cell.
In a specific implementation, the interfering cell parameter determining unit 202 may be configured to set a transmission mode of the interfering cell as a first transmission mode when n is less than or equal to j, and determine other cell parameters corresponding to a current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is a first transmission mode, setting the transmission mode of the interference cell as the first transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is not the first transmission mode, setting the transmission mode of the interference cell as the second transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; the first transmission mode is different from the second transmission mode, N is an identifier corresponding to a current symbol, j is a preset numerical value, j is more than or equal to 1 and less than or equal to N, and N is the total number of symbols of the downlink subframe.
In a specific implementation, the first transmission mode may be a Rank1 transmission mode, and the second transmission mode may be an SFBC transmission mode.
In a specific implementation, the user terminal 20 may further include: a calibrating unit 204, configured to, when the first transmission mode is a Rank1 transmission mode, after calculating a demodulation log-likelihood ratio of a serving cell corresponding to a current symbol on a current physical resource block, calibrate the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block.
In a specific implementation, the calibration unit 204 may be configured to calculate a reliability metric corresponding to a current symbol on the current physical resource block; acquiring a first weighting coefficient corresponding to a reliability metric value corresponding to a current symbol on the current physical resource block; multiplying the first weighting coefficient by a demodulation log-likelihood ratio corresponding to a current symbol on the current physical resource block to obtain a first product; multiplying the second weighting coefficient by the output log-likelihood ratio of the preset receiver to obtain a second product; adding the first product and the second product to obtain a sum value which is used as a demodulation log-likelihood ratio of a service cell corresponding to a current symbol on a current physical resource block after calibration; wherein the sum of the first weighting coefficient and the second weighting coefficient is 1.
In a specific implementation, the interfering cell parameter may include: modulation type of the interfering cell.
In a specific implementation, the calculating unit 203 may be configured to calculate a demodulation log-likelihood ratio of a serving cell corresponding to a current symbol on the current physical resource block according to a modulation type corresponding to a symbol previous to the current symbol on the current physical resource block.
An embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method for demodulating a serving cell provided in any of the above embodiments of the present invention is executed.
An embodiment of the present invention further provides an electronic device, which includes a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the serving cell demodulation method provided in any of the above embodiments of the present invention.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (18)

1. A method for serving cell demodulation, comprising:
traversing all resource elements corresponding to a current symbol on a current physical resource block;
determining an interfering cell parameter corresponding to a current symbol on the current physical resource block, including: calculating reliability measurement values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset interference cell parameter combination; selecting an interference cell parameter combination corresponding to the minimum reliability metric value as an interference cell parameter corresponding to the current symbol on the current physical resource block; calculating the reliability metric values corresponding to all resource elements corresponding to the current symbol on the current physical resource block under each preset group of interference cell parameter combinations by adopting the following formula:
Figure FDA0003024142300000011
where m denotes the current physical resource block, n denotes the current symbol on the current physical resource block, Metricm,n,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the current symbol on the current physical resource block; metricm,n-1,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the (n-1) th symbol on the current physical resource block; k belongs to (m, n) and represents all resource elements corresponding to the current symbol on the current physical resource block; r iskA signal vector received for a kth RE in a current symbol on a current physical resource block; rhoSTransmitting power for service signal of service cellThe ratio of the rate to the pilot signal transmit power,
Figure FDA0003024142300000012
to estimate the channel matrix of the serving cell,
Figure FDA0003024142300000013
a precoding matrix for the serving cell,
Figure FDA0003024142300000014
a data signal transmitted for a serving cell; rhoI,iThe ratio of RE transmitting power corresponding to the data signal with index i of the interference cell to RE transmitting power corresponding to the dedicated reference signal;
Figure FDA0003024142300000015
estimating to obtain a channel matrix of an interference cell with index i;
Figure FDA0003024142300000016
is a precoding matrix of the interfering cell with index i,
Figure FDA0003024142300000017
is a data signal transmitted by an interfering cell with index i;
and calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the determined interference cell parameters.
2. The serving cell demodulation method of claim 1 wherein the interfering cell parameters comprise: the transmission mode of the interfering cell.
3. The method for demodulating a serving cell according to claim 2, wherein the determining the interfering cell parameter corresponding to the current symbol on the current physical resource block includes:
when n is less than or equal to j, setting the transmission mode of the interference cell as a first transmission mode, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block;
when n is j and the transmission mode of the interference cell is a first transmission mode, setting the transmission mode of the interference cell as the first transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is not the first transmission mode, setting the transmission mode of the interference cell as the second transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block;
the first transmission mode is different from the second transmission mode, N is an identifier corresponding to a current symbol, j is a preset numerical value, j is more than or equal to 1 and less than or equal to N, and N is the total number of symbols of the downlink subframe.
4. The serving cell demodulation method of claim 3, wherein the first transmission mode is a Rank1 transmission mode and the second transmission mode is an SFBC transmission mode.
5. The method for demodulating a serving cell according to claim 4, wherein when the first transmission mode is a Rank1 transmission mode, after calculating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block, the method further comprises:
and calibrating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block.
6. The serving cell demodulation method of claim 5 wherein said calibrating the demodulation log-likelihood ratio for the serving cell corresponding to the current symbol on the current physical resource block comprises:
calculating a reliability metric value corresponding to a current symbol on the current physical resource block;
acquiring a first weighting coefficient corresponding to a reliability metric value corresponding to a current symbol on the current physical resource block;
multiplying the first weighting coefficient by a demodulation log-likelihood ratio corresponding to a current symbol on the current physical resource block to obtain a first product;
multiplying the second weighting coefficient by the output log-likelihood ratio of the preset receiver to obtain a second product;
adding the first product and the second product to obtain a sum value which is used as a demodulation log-likelihood ratio of a service cell corresponding to a current symbol on a current physical resource block after calibration;
wherein the sum of the first weighting coefficient and the second weighting coefficient is 1.
7. The serving cell demodulation method of claim 1 wherein the interfering cell parameters comprise: modulation type of the interfering cell.
8. The serving cell demodulation method of claim 7 wherein said calculating the demodulation log-likelihood ratio for the serving cell corresponding to the current symbol on the current physical resource block comprises:
and calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the modulation type corresponding to the symbol before the current symbol on the current physical resource block.
9. A user terminal, comprising:
the traversing unit is used for traversing all resource elements corresponding to the current symbol on the current physical resource block;
an interfering cell parameter determining unit, configured to determine an interfering cell parameter corresponding to the current symbol on the current physical resource block, where the interfering cell parameter determining unit includes: calculating reliability measurement values corresponding to all resource elements corresponding to a current symbol on the current physical resource block under each preset interference cell parameter combination; selecting an interference cell parameter combination corresponding to the minimum reliability metric value as an interference cell parameter corresponding to the current symbol on the current physical resource block; calculating the reliability metric values corresponding to all resource elements corresponding to the current symbol on the current physical resource block under each preset group of interference cell parameter combinations by adopting the following formula:
Figure FDA0003024142300000031
where m denotes the current physical resource block, n denotes the current symbol on the current physical resource block, Metricm,n,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the current symbol on the current physical resource block; metricm,n-1,iCombining reliability measurement values corresponding to the ith group of interference cell parameters corresponding to the (n-1) th symbol on the current physical resource block; k belongs to (m, n) and represents all resource elements corresponding to the current symbol on the current physical resource block; r iskA signal vector received for a kth RE in a current symbol on a current physical resource block; rhoSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA0003024142300000032
to estimate the channel matrix of the serving cell,
Figure FDA0003024142300000033
a precoding matrix for the serving cell,
Figure FDA0003024142300000034
a data signal transmitted for a serving cell; rhoI,iThe ratio of RE transmitting power corresponding to the data signal with index i of the interference cell to RE transmitting power corresponding to the dedicated reference signal;
Figure FDA0003024142300000035
estimating to obtain a channel matrix of an interference cell with index i;
Figure FDA0003024142300000036
is a precoding matrix of the interfering cell with index i,
Figure FDA0003024142300000037
is a data signal transmitted by an interfering cell with index i; (ii) a
And the calculating unit is used for calculating the demodulation log-likelihood ratio of the service cell corresponding to the current symbol on the current physical resource block according to the determined interference cell parameters.
10. The user terminal of claim 9, wherein the interfering cell parameters include: the transmission mode of the interfering cell.
11. The ue of claim 10, wherein the interfering cell parameter determining unit is configured to set a transmission mode of the interfering cell as a first transmission mode and determine other cell parameters corresponding to a current symbol on the current physical resource block when n is less than or equal to j; when n is j and the transmission mode of the interference cell is a first transmission mode, setting the transmission mode of the interference cell as the first transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; when n is j and the transmission mode of the interference cell is not the first transmission mode, setting the transmission mode of the interference cell as the second transmission mode when n is larger than j, and determining other interference cell parameters corresponding to the current symbol on the current physical resource block; the first transmission mode is different from the second transmission mode, N is an identifier corresponding to a current symbol, j is a preset numerical value, j is more than or equal to 1 and less than or equal to N, and N is the total number of symbols of the downlink subframe.
12. The user terminal of claim 11, wherein the first transmission mode is a Rank1 transmission mode and the second transmission mode is an SFBC transmission mode.
13. The user terminal of claim 12, further comprising: a calibrating unit, configured to, when the first transmission mode is a Rank1 transmission mode, calibrate the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block after calculating the demodulation log-likelihood ratio of the serving cell corresponding to the current symbol on the current physical resource block.
14. The user terminal of claim 13, wherein the calibration unit is configured to calculate a reliability metric corresponding to a current symbol on the current physical resource block; acquiring a first weighting coefficient corresponding to a reliability metric value corresponding to a current symbol on the current physical resource block; multiplying the first weighting coefficient by a demodulation log-likelihood ratio corresponding to a current symbol on the current physical resource block to obtain a first product; multiplying the second weighting coefficient by the output log-likelihood ratio of the preset receiver to obtain a second product; adding the first product and the second product to obtain a sum value which is used as a demodulation log-likelihood ratio of a service cell corresponding to a current symbol on a current physical resource block after calibration; wherein the sum of the first weighting coefficient and the second weighting coefficient is 1.
15. The user terminal of claim 9, wherein the interfering cell parameters include: modulation type of the interfering cell.
16. The ue according to claim 15, wherein the calculating unit is configured to calculate a demodulation log-likelihood ratio of a serving cell corresponding to a current symbol on the current physical resource block according to a modulation type corresponding to a symbol previous to the current symbol on the current physical resource block.
17. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the serving cell demodulation method of any of claims 1-8.
18. An electronic device comprising a memory and a processor, the memory having stored thereon a computer program operable on the processor, wherein the processor executes the computer program to perform the serving cell demodulation method of any of claims 1-8.
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