CN109150771B - User terminal, interference cell blind detection method, storage medium and electronic equipment - Google Patents

User terminal, interference cell blind detection method, storage medium and electronic equipment Download PDF

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CN109150771B
CN109150771B CN201710508383.7A CN201710508383A CN109150771B CN 109150771 B CN109150771 B CN 109150771B CN 201710508383 A CN201710508383 A CN 201710508383A CN 109150771 B CN109150771 B CN 109150771B
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transmission mode
cell
rank1
interference
precoding matrix
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CN109150771A (en
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余辉
田琛
严伟
李卫国
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
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • 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
    • 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
    • H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
    • 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
    • H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
    • H04L1/0053—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables specially adapted for power saving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0238—Channel estimation using blind estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A user terminal, an interference cell blind detection method, a storage medium and an electronic device are provided, the method includes: receiving a pilot signal issued by a base station, wherein the pilot signal comprises a special reference signal of an interference cell; under a preset condition, determining a transmission mode and a precoding matrix index of the interference cell according to the special reference signal of the interference cell; and detecting a modulation mode corresponding to the special reference signal of the interference cell and RE transmitting power corresponding to the special reference signal of the interference cell according to the transmission mode and the precoding matrix index of the interference cell. The scheme can effectively reduce the complexity and power consumption of the user terminal for performing combined blind detection on the interference parameters.

Description

User terminal, interference cell blind detection method, storage medium and electronic equipment
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a user terminal, an interfering cell blind detection 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 an Interference parameter to the ue through broadcasting, dedicated signaling, or Downlink Control Information (DCI). The interference parameters include a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), and a Modulation Order (MOD) of the neighbor. Under the condition that the interference parameters are known, the User Equipment (UE) performs corresponding processing operations on the received signals, so that the performance of the communication system can be obviously improved.
However, the successful operation of the NAICS technology depends on the 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.
To overcome cell scheduling limitations and network signaling overhead, a User Equipment (UE) may blindly estimate interference parameters from received signals. In the prior art, when a user terminal performs joint blind detection on an interference cell to obtain an interference parameter, the complexity is high and the power consumption is high.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is how to reduce the complexity and power consumption of the user terminal for carrying out the combined blind detection on the interference parameters.
To solve the above technical problem, an embodiment of the present invention provides a method for blind detection of an interfering cell, including: receiving a pilot signal issued by a base station, wherein the pilot signal comprises a special reference signal of an interference cell; under a preset condition, determining a transmission mode and a precoding matrix index of the interference cell according to the special reference signal of the interference cell; and detecting a modulation mode corresponding to the special reference signal of the interference cell and RE transmitting power corresponding to the special reference signal of the interference cell according to the transmission mode and the precoding matrix index of the interference cell.
Optionally, the preset conditions include: setting the modulation mode of the received reference signal special for the interference cell as a first modulation mode, wherein the ratio of the service signal transmitting power of the interference cell to the pilot signal transmitting power is a first value.
Optionally, the determining the transmission mode and the precoding matrix index of the interfering cell includes: judging whether the transmission mode of the interference cell is a first transmission mode or not; when the transmission mode of the interference cell is a first transmission mode, acquiring a precoding matrix index corresponding to the first transmission mode; when the transmission mode of the interference cell is not the first transmission mode, judging whether the transmission mode of the interference cell is the second transmission mode; when the transmission mode of the interference cell is the second transmission mode, acquiring a precoding matrix index corresponding to the second transmission mode; when the transmission mode of the interfering cell is not the second transmission mode, determining that the transmission mode dedicated to the interfering cell is a third transmission mode, and acquiring a precoding matrix index corresponding to the third transmission mode.
Optionally, the first transmission mode, the second transmission mode, and the third transmission mode are any one of the following modes and are different: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode.
Optionally, when the first transmission mode is a Rank1 transmission mode, the determining whether the transmission mode of the interfering cell is the first transmission mode includes: acquiring all precoding matrixes corresponding to the Rank1 transmission mode; calculating a corresponding reliability metric value when the transmission mode of the interference cell is a Rank1 transmission mode; and when the reliability metric value corresponding to the Rank1 transmission mode is smaller than a preset Rank1 transmission mode threshold value, determining that the transmission mode of the interference cell is the Rank1 transmission mode.
Optionally, the calculating a reliability metric value corresponding to the transmission mode of the interfering cell being the Rank1 transmission mode includes: calculating the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; calculating the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode, and selecting the minimum value from the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; and dividing the minimum value and the obtained sum value to obtain a reliability metric value corresponding to the Rank1 transmission mode.
Optionally, the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode are calculated by using the following formula:
Figure BDA0001335193890000021
wherein EDk,iA metric value corresponding to an ith precoding matrix corresponding to the Rank1 transmission mode; i is a precoding matrix index corresponding to a Rank1 transmission mode, i is an integer and is more than or equal to 0 and less than or equal to 3; k is an identifier of an RE carrying a dedicated reference signal of the interfering cell; r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000031
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000032
a precoding matrix for the serving cell,
Figure BDA0001335193890000033
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 BDA0001335193890000034
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000035
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000036
a data signal transmitted for an interfering cell;
Figure BDA0001335193890000037
to seek
Figure BDA0001335193890000038
Corresponds to the minimum value of
Figure BDA0001335193890000039
And calculating the reliability metric value corresponding to the Rank1 transmission mode by adopting the following formula:
Figure BDA00013351938900000310
wherein EDrank1For the reliability metric corresponding to Rank1 transmission mode,
Figure BDA00013351938900000311
to take the minimum value of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode,
Figure BDA00013351938900000312
the sum of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode.
Optionally, when it is determined that the first transmission mode is a Rank1 transmission mode, determining a precoding matrix index value of the interfering cell in a Rank1 transmission mode by using the following formula:
Figure BDA00013351938900000313
wherein the content of the first and second substances,
Figure BDA00013351938900000314
to get
Figure BDA00013351938900000315
The value of i corresponds to the minimum value.
Optionally, when the second transmission mode is an SFBC transmission mode, the determining whether the transmission mode of the interfering cell is the second transmission mode includes: calculating the reliability measurement value corresponding to the SFBC transmission mode as the transmission mode of the interference cell; and when the reliability metric value corresponding to the SFBC transmission mode is larger than a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is the SFBC transmission mode.
Optionally, the following formula is adopted to calculate the reliability metric value corresponding to the transmission mode of the interfering cell being the SFBC transmission mode:
Figure BDA0001335193890000041
wherein EDSFBCA reliability metric, r, corresponding to the SFBC transmission modekFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000042
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000043
a precoding matrix for the serving cell,
Figure BDA0001335193890000044
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 BDA0001335193890000045
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000046
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000047
a data signal transmitted for an interfering cell; ED (electronic device)rank1A reliability metric corresponding to the Rank1 transmission mode.
Optionally, when the third transmission mode is a Rank2 transmission mode, a precoding matrix index corresponding to the Rank2 transmission mode is:
Figure BDA0001335193890000048
wherein r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000049
to estimate the channel matrix of the serving cell,
Figure BDA00013351938900000410
a precoding matrix for the serving cell,
Figure BDA00013351938900000411
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 BDA00013351938900000412
obtaining a channel matrix of an interference cell by estimation;
Figure BDA00013351938900000413
a precoding matrix with index i for the interfering cell,
Figure BDA00013351938900000414
is a data signal transmitted by an interfering cell.
Optionally, the determining the transmission mode and the precoding index matrix of the interfering cell includes: carrying out QR decomposition on a channel matrix for transmitting the pilot signal; traversing the constellation points of the modulation types of the first n symbols, and counting the last ts+tI-making hard decisions on r symbols, determining the transmission mode and precoding index matrix of the interfering cell; where n is max (t)s+tI-r，1)，tsNumber of symbols transmitted in parallel for the serving cell, tIR is the total number of symbols in the RE for the number of symbols transmitted in parallel by the interfering cell.
Optionally, the detecting a modulation scheme corresponding to the dedicated reference signal of the interfering cell includes: detecting a modulation mode corresponding to the special reference signal of the interference cell by adopting the following constellation diagram: when the gain is-3 dB, the corresponding constellation diagram is obtained by multiplying the first scale factor by the initial constellation diagram; when the gain is 3dB, the corresponding constellation diagram is obtained by multiplying the second scale factor by the initial constellation diagram; when the gain is 0dB, the corresponding constellation diagram is obtained by multiplying the third scale factor by the initial constellation diagram; the first scaling factor is less than the third scaling factor, which is less than the second scaling factor.
Optionally, the first scaling factor is 0.7079, the second scaling factor is 1.4125, and the third scaling factor is 1.
An embodiment of the present invention provides a user terminal, including: a receiving unit, configured to receive a pilot signal sent by a base station, where the pilot signal includes a dedicated reference signal of an interfering cell; a determining unit, configured to determine, under a preset condition, a transmission mode and a precoding matrix index of the interfering cell according to the dedicated reference signal of the interfering cell; a detecting unit, configured to detect, according to the transmission mode and the precoding matrix index of the interfering cell, a modulation mode corresponding to the dedicated reference signal of the interfering cell and RE transmission power corresponding to the dedicated reference signal of the interfering cell.
Optionally, the preset conditions include: setting the modulation mode of the received reference signal special for the interference cell as a first modulation mode, wherein the ratio of the service signal transmitting power of the interference cell to the pilot signal transmitting power is a first value.
Optionally, the determining unit is configured to determine whether a transmission mode of the interfering cell is a first transmission mode; when the transmission mode of the interference cell is a first transmission mode, acquiring a precoding matrix index corresponding to the first transmission mode; when the transmission mode of the interference cell is not the first transmission mode, judging whether the transmission mode of the interference cell is the second transmission mode; when the transmission mode of the interference cell is the second transmission mode, acquiring a precoding matrix index corresponding to the second transmission mode; when the transmission mode of the interfering cell is not the second transmission mode, determining that the transmission mode dedicated to the interfering cell is a third transmission mode, and acquiring a precoding matrix index corresponding to the third transmission mode.
Optionally, the first transmission mode, the second transmission mode, and the third transmission mode are any one of the following modes and are different: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode.
Optionally, the determining unit is configured to, when the first transmission mode is a Rank1 transmission mode, obtain all precoding matrices corresponding to the Rank1 transmission mode; calculating a corresponding reliability metric value when the transmission mode of the interference cell is a Rank1 transmission mode; and when the reliability metric value corresponding to the Rank1 transmission mode is smaller than a preset Rank1 transmission mode threshold value, determining that the transmission mode of the interference cell is the Rank1 transmission mode.
Optionally, the determining unit is configured to calculate metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode; calculating the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode, and selecting the minimum value from the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; and dividing the minimum value and the obtained sum value to obtain a reliability metric value corresponding to the Rank1 transmission mode.
Optionally, the determining unit is configured to calculate metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode by using the following formula:
Figure BDA0001335193890000061
wherein EDk,iA metric value corresponding to an ith precoding matrix corresponding to the Rank1 transmission mode; i is a precoding matrix index corresponding to a Rank1 transmission mode, i is an integer and is more than or equal to 0 and less than or equal to 3; k is an identifier of an RE carrying a dedicated reference signal of the interfering cell; r iskFor the signal vector received at the kth RE, pSTraffic signal transmit power and pilot signal transmit power for a serving cellThe ratio of (a) to (b),
Figure BDA0001335193890000062
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000063
a precoding matrix for the serving cell,
Figure BDA0001335193890000064
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 BDA0001335193890000065
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000066
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000067
a data signal transmitted for an interfering cell;
Figure BDA0001335193890000068
to seek
Figure BDA0001335193890000069
Corresponds to the minimum value of
Figure BDA00013351938900000610
And calculating the reliability metric value corresponding to the Rank1 transmission mode by adopting the following formula:
Figure BDA00013351938900000611
wherein EDrank1For the reliability metric corresponding to Rank1 transmission mode,
Figure BDA00013351938900000612
to getThe Rank1 transmission mode corresponds to the minimum value of the metric values corresponding to all precoding matrices,
Figure BDA00013351938900000613
the sum of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode.
Optionally, the determining unit is configured to determine, when the first transmission mode is determined to be a Rank1 transmission mode, a precoding matrix index value of the interfering cell in a Rank1 transmission mode by using the following formula:
Figure BDA00013351938900000614
wherein the content of the first and second substances,
Figure BDA00013351938900000615
to get
Figure BDA00013351938900000616
The value of i corresponds to the minimum value.
Optionally, the determining unit is configured to calculate a reliability metric value corresponding to that the transmission mode of the interfering cell is the SFBC transmission mode when the second transmission mode is the SFBC transmission mode; and when the reliability metric value corresponding to the SFBC transmission mode is larger than a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is the SFBC transmission mode.
Optionally, the determining unit is configured to calculate a reliability metric value corresponding to the transmission mode of the interfering cell being an SFBC transmission mode by using the following formula:
Figure BDA0001335193890000071
wherein EDSFBCA reliability metric, r, corresponding to the SFBC transmission modekFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000072
to estimate to obtainThe channel matrix of the serving cell of (a),
Figure BDA0001335193890000073
a precoding matrix for the serving cell,
Figure BDA0001335193890000074
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 BDA0001335193890000075
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000076
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000077
a data signal transmitted for an interfering cell; ED (electronic device)rank1A reliability metric corresponding to the Rank1 transmission mode.
Optionally, the determining unit is configured to determine, when the third transmission mode is a Rank2 transmission mode, that a precoding matrix index corresponding to the Rank2 transmission mode is:
Figure BDA0001335193890000078
wherein r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000079
to estimate the channel matrix of the serving cell,
Figure BDA00013351938900000710
a precoding matrix for the serving cell,
Figure BDA00013351938900000711
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 BDA00013351938900000712
obtaining a channel matrix of an interference cell by estimation;
Figure BDA00013351938900000713
a precoding matrix with index i for the interfering cell,
Figure BDA00013351938900000714
is a data signal transmitted by an interfering cell.
Optionally, the determining unit is configured to perform QR decomposition on a channel matrix for transmitting the pilot signal; traversing the constellation points of the modulation types of the first n symbols, and counting the last ts+tI-making hard decisions on r symbols, determining the transmission mode and precoding index matrix of the interfering cell; where n is max (t)s+tI-r，1)，tsNumber of symbols transmitted in parallel for the serving cell, tIR is the total number of symbols in the RE for the number of symbols transmitted in parallel by the interfering cell.
Optionally, the determining unit is configured to detect a modulation scheme corresponding to the dedicated reference signal of the interfering cell by using the following constellation diagram: when the gain is-3 dB, the corresponding constellation diagram is obtained by multiplying the first scale factor by the initial constellation diagram; when the gain is 3dB, the corresponding constellation diagram is obtained by multiplying the second scale factor by the initial constellation diagram; when the gain is 0dB, the corresponding constellation diagram is obtained by multiplying the third scale factor by the initial constellation diagram; the first scaling factor is less than the third scaling factor, which is less than the second scaling factor.
Optionally, the first scaling factor is 0.7079, the second scaling factor is 1.4125, and the third scaling factor is 1.
The 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 performs any of the above steps of the interference cell blind detection method.
The embodiment of the present invention further provides an electronic device, which includes a memory and a processor, and when the computer instruction runs, the method performs any of the above steps of the interference cell blind detection method.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
when the interference cell blind detection is carried out, the transmission mode and the precoding matrix index of the interference cell are determined according to the special reference signal of the interference cell. And then, detecting a modulation mode and RE transmitting power corresponding to the special reference signal of the interference cell according to the determined transmission mode and the precoding matrix index of the interference cell. Since the transmission mode and the precoding matrix index of the interference cell are determined first, the transmission power, the precoding matrix and the modulation mode of all REs do not need to be traversed, and the complexity and the power consumption of the user terminal for performing the joint detection on the interference parameters can be reduced.
Furthermore, by performing QR decomposition on the channel matrix for transmitting the pilot signal, it is only necessary to traverse the constellation points of the modulation types to which the first n symbols belong, and it is not necessary to traverse the constellation points of the modulation types to which all the symbols belong, so that the complexity and power consumption of joint detection can be further reduced.
In addition, the number of QR decomposition times can be reduced by multiplying the modulation constellation diagram by a preset scale factor, so that the complexity and the power consumption of joint detection can be further reduced.
Drawings
Fig. 1 is a flowchart of a method for blind detection of an interfering cell 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 a user terminal on a kth pilot Resource Element (RE) is rk，rkCan be expressed asFormula (1):
Figure BDA0001335193890000091
in the formula (1), the reaction mixture is,
Figure BDA0001335193890000092
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 BDA0001335193890000093
pilot signals of a serving cell corresponding to the kth RE;
Figure BDA0001335193890000094
representing the effective channel matrix corresponding to the interference cell corresponding to the kth RE;
Figure BDA0001335193890000095
pilot signals of interference cells corresponding to the kth RE; n iskA noise signal corresponding to the k-th RE, and nkIs variance of
Figure BDA0001335193890000096
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). The estimated channel matrix of the serving cell is
Figure BDA0001335193890000097
The estimated channel matrix of the interfering cell is
Figure BDA0001335193890000098
The above formula (1) can be represented as the following formula (2):
Figure BDA0001335193890000099
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 BDA00013351938900000910
A precoding matrix for a serving cell corresponding to a kth RE,
Figure BDA00013351938900000911
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 cell scheduling limitations and network signaling overhead, a User Equipment (UE) may blindly estimate interference parameters from a received signal, where the interference parameters include a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), a Modulation Order (MOD), a TPR of an 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 generally adopted to obtain the interference parameter of the interfering cell on the kth RE:
Figure BDA0001335193890000101
in the formula (3), the reaction mixture is,
Figure BDA0001335193890000102
the modulation class of the serving cell corresponding to the kth RE,
Figure BDA0001335193890000103
the modulation level of the interfering cell corresponding to the kth RE. In the formula (3), ρS、
Figure BDA0001335193890000104
And
Figure BDA0001335193890000105
all can be issued to the user terminal by the serving cell through network signaling, that is, rhoS、
Figure BDA0001335193890000106
And
Figure BDA0001335193890000107
are known. Thus, the physical meaning of equation (3) can be expressed as: selecting the formula
Figure BDA0001335193890000108
Is smallest value ρI、
Figure BDA0001335193890000109
And
Figure BDA00013351938900001010
as an interference parameter for interfering cells on the kth RE.
In practical applications, when calculating equation (3), ρ is usually traversedI、
Figure BDA00013351938900001011
And
Figure BDA00013351938900001012
to obtain EDk。
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 BDA00013351938900001013
And
Figure BDA00013351938900001014
is too complex to compute.
In the embodiment of the invention, the transmission mode and the precoding matrix index of the interference cell are determined firstly, so that the transmission power, the precoding matrix and the modulation mode of all REs do not need to be traversed, and the complexity and the power consumption of the user terminal for carrying out the joint detection on the interference parameters can be 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.
The embodiment of the invention provides a method for blind detection of an interference cell, which is described in detail by referring to fig. 1 through specific steps.
Step S101, receiving a pilot signal sent by a base station.
In a specific implementation, the pilot signal received by the ue and transmitted by the base station includes a dedicated reference signal of a serving cell, a dedicated reference signal of an interfering cell, and a noise signal. Specifically, the received expression of the pilot signal sent by the base station may refer to equations (1) and (2) and their corresponding descriptions, which are not described herein again.
Step S102, under the preset condition, according to the special reference signal of the interference cell, determining the transmission mode and the precoding matrix index of the interference cell.
In practical applications, the transmission mode of the interfering cell may include the following three types: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode.
In a specific implementation, the preset conditions may include: setting a modulation mode of the received reference signal special for the interference cell as a first modulation mode, wherein the ratio of the service signal transmitting power of the interference cell to the pilot signal transmitting power is a first value.
Under a preset condition, according to the dedicated reference signal of the interfering cell, it may be determined whether the transmission mode of the interfering cell is the first transmission mode. And if the transmission mode of the interference cell is judged to be the first transmission mode, acquiring a precoding matrix index corresponding to the first transmission mode.
If the transmission mode of the interfering cell is not the first transmission mode, it may be continuously determined whether the transmission mode of the interfering cell is the second transmission mode. And if the transmission mode of the interference cell is judged to be the second transmission mode, acquiring a precoding matrix index corresponding to the second transmission mode.
If the transmission mode of the interfering cell is not the second transmission mode, since the transmission modes of the interfering cells in the existing LTE system include three transmission modes, the transmission modes of the interfering cells are not the first transmission mode nor the second transmission mode, and the transmission mode of the interfering cells can be directly determined to be the third transmission mode, and the precoding matrix index corresponding to the third transmission mode is obtained.
In a specific implementation, the first transmission mode, the second transmission mode, and the third transmission mode are respectively any one of the following three types: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode, and the first transmission mode, the second transmission mode, and the third transmission mode are all different.
The following describes the step S102 by taking the first transmission mode as the Rank1 transmission mode, the second transmission mode as the SFBC transmission mode, and the third transmission mode as the Rank2 transmission mode as examples.
In a specific implementation, the Modulation mode of the reference signal dedicated to the interfering cell may be set to 16 Quadrature Amplitude Modulation (QAM), and the ratio of the traffic signal transmission power to the pilot signal transmission power of the interfering cell is 1. It is understood that the modulation mode of the set interference cell dedicated reference signal may also be 64QAM, 256QAM, or Quadrature Phase Shift Keying (QPSK). The ratio of the traffic signal transmission power to the pilot signal transmission power of the interfering cell may be other values, and is not limited to 1.
First, it is determined whether the transmission mode of the interfering cell is a Rank1 transmission mode. When judging whether the transmission mode of the interference cell is the Rank1 transmission mode, all precoding matrixes corresponding to the Rank1 transmission mode are acquired. And then, calculating a corresponding reliability metric value when the transmission mode of the interference cell is the Rank1 transmission mode. And when the corresponding reliability metric value is smaller than a preset Rank1 transmission mode threshold value when the transmission mode of the interference cell is a Rank1 transmission mode, judging that the transmission mode of the interference cell is a Rank1 transmission mode.
When the reliability metric value corresponding to the transmission mode of the interfering cell is the Rank1 transmission mode, the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode may be calculated first. And after the metric values corresponding to all the precoding matrixes corresponding to the Rank1 transmission mode are obtained, summing the metric values corresponding to all the precoding matrixes corresponding to the Rank1 transmission mode. And selecting a minimum value from the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode, and dividing the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode and the selected minimum value to obtain a quotient which is a reliability metric value corresponding to the Rank1 transmission mode.
Referring to table 1, a precoding matrix corresponding to the existing Rank1 transmission mode is given:
TABLE 1
Figure BDA0001335193890000121
Figure BDA0001335193890000131
And respectively calculating the metric value corresponding to each precoding matrix by using the precoding matrix with the precoding matrix index of 0-3 in the history table 1.
In a specific implementation, the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode can be calculated by using the following formula (4):
Figure BDA0001335193890000132
wherein EDk,iA metric value corresponding to an ith precoding matrix corresponding to the Rank1 transmission mode; i is a precoding matrix index corresponding to a Rank1 transmission mode, i is an integer and is more than or equal to 0 and less than or equal to 3; k is an identifier of an RE carrying a dedicated reference signal of the interfering cell; r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000133
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000134
a precoding matrix for the serving cell,
Figure BDA0001335193890000135
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 BDA0001335193890000136
for small interference obtained by estimationA channel matrix of the region;
Figure BDA0001335193890000137
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000138
is a data signal transmitted by an interfering cell.
In the above-mentioned formula (4),
Figure BDA0001335193890000139
to make an effort to
Figure BDA00013351938900001310
Corresponds to the minimum value of
Figure BDA00013351938900001311
After the metric value corresponding to each precoding matrix corresponding to the Rank1 transmission mode is obtained through calculation, the reliability metric value corresponding to the Rank1 transmission mode can be calculated by adopting the following formula (5):
Figure BDA00013351938900001312
wherein EDrank1For the reliability metric corresponding to Rank1 transmission mode,
Figure BDA00013351938900001313
to take the minimum value of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode,
Figure BDA0001335193890000141
the sum of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode.
Obtaining reliability metric ED corresponding to Rank1 transmission moderank1Then, ED is carried outrank1And a preset Rank1 transmission mode threshold value Thrank1A comparison is made. When EDrank1＜Thrank1When the interference cell is detected, judging that the transmission mode of the interference cell is a Rank1 transmission mode; when EDrank1≥Thrank1If so, it is determined that the transmission mode of the interfering cell is not the Rank1 transmission mode, and it is necessary to continuously determine whether the transmission mode of the interfering cell is the SFBC transmission mode.
When the transmission mode of the interfering cell is determined to be the Rank1 transmission mode, the precoding matrix index value of the interfering cell may be determined using the following equation (6):
Figure BDA0001335193890000142
wherein the content of the first and second substances,
Figure BDA0001335193890000143
to get
Figure BDA0001335193890000144
The value of i corresponds to the minimum value.
When EDrank1≥Thrank1And judging whether the transmission mode of the interference cell is the SFBC transmission mode or not. When determining whether the transmission mode of the interfering cell is the SFBC transmission mode, the reliability metric corresponding to the transmission mode of the interfering cell being the SFBC transmission mode may be calculated. When the reliability metric value corresponding to the SFBC transmission mode is larger than a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is the SFBC transmission mode; and when the reliability metric value corresponding to the SFBC transmission mode is smaller than or equal to a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is a Rank2 transmission mode.
In a specific implementation, the following formula (7) may be used to calculate a reliability metric value corresponding to the transmission mode of the interfering cell being the SFBC transmission mode:
Figure BDA0001335193890000145
wherein EDSFBCAnd the reliability metric value is corresponding to the SFBC transmission mode. ED in formula (7)rank1Is driedAnd the transmission mode of the interference cell is a reliability metric value corresponding to the Rank1 transmission mode. ED (electronic device)rank1The calculation of (a) may refer to formula (5) provided in the above embodiments of the present invention, and details are not described herein.
It will be appreciated that in practice, other calculation methods may be used to calculate EDrank1And is not limited to the formula (5) provided in the above embodiment of the present invention.
Will calculate the EDSFBCAnd a preset SFBC transmission mode threshold value ThSFBCA comparison is made. When EDSFBC＞ThSFBCJudging that the transmission mode of the interference cell is an SFBC transmission mode; when EDSFBC≤ThSFBCThen, it is determined that the transmission mode of the interfering cell is not the SFBC transmission mode.
When the transmission mode of the interfering cell is the SFBC transmission mode, taking the number of the transmitting antennas of the interfering cell as 2 as an example, the adjacent data REs of the interfering cell satisfy the following conditions:
Figure BDA0001335193890000151
when the transmission mode of the interfering cell is not the Rank1 transmission mode or the SFBC transmission mode, it may be directly determined that the transmission mode of the interfering cell is the Rank2 transmission mode.
When the transmission mode of the interfering cell is the Rank2 transmission mode, the precoding matrix index corresponding to the Rank2 transmission mode may be calculated by the following formula (9):
Figure BDA0001335193890000152
wherein r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000153
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000154
a precoding matrix for the serving cell,
Figure BDA0001335193890000155
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 BDA0001335193890000156
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000157
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000158
is a data signal transmitted by an interfering cell.
Through step S102, the transmission mode and the precoding matrix index of the interfering cell may be determined.
Step S103, according to the transmission mode and the pre-coding matrix index of the interference cell, detecting the modulation mode corresponding to the dedicated reference signal of the interference cell and the RE transmitting power corresponding to the dedicated reference signal of the interference cell.
After the transmission mode and the precoding matrix index of the interfering cell are determined, the modulation mode corresponding to the dedicated reference signal of the interfering cell and the RE transmission power corresponding to the dedicated reference signal of the interfering cell can be obtained according to the determined transmission mode and the determined precoding matrix index of the interfering cell.
In a specific implementation, the following formula (10) may be adopted to calculate a modulation scheme corresponding to the dedicated reference signal of the interfering cell and RE transmission power corresponding to the dedicated reference signal of the interfering cell:
Figure BDA0001335193890000161
as can be seen from comparing equation (10) with equation (3), in equation (10), the precoding matrix index of the interfering cell is already determined
Figure BDA0001335193890000162
Thus, only all possible ρ need be traversedIAnd all of
Figure BDA0001335193890000163
And
Figure BDA0001335193890000164
all constellation points of the modulation level are enough, so that the computation complexity of the joint blind detection can be reduced.
In the implementation, although the calculation complexity is reduced when the parameter estimation of the interfering cell is performed by using the formula (10) compared with the prior art, it is still necessary to traverse all possible ρIAnd all of
Figure BDA0001335193890000165
And
Figure BDA0001335193890000166
all constellation points of the modulation class. In order to further simplify the computation complexity of the blind detection of the interfering cell, in the specific implementation, the formula (1) can be rewritten to obtain the following formula (11);
Figure BDA0001335193890000167
wherein the content of the first and second substances,
Figure BDA0001335193890000168
for the received signal on the kth RE for the jth receive antenna of the user terminal,
Figure BDA0001335193890000169
equivalent information of the mth transmitting antenna of the serving cell and the jth receiving antenna of the user terminal on the kth REAnd (4) carrying out the following steps.
For those in the above formula (11)
Figure BDA00013351938900001610
QR decomposition is carried out to obtain the following formula (12):
Figure BDA0001335193890000171
multiplying the left and right sides of the equation of formula (12) by Qk HTo obtain the following formula (13):
Figure BDA0001335193890000172
in formula (13), n is max (t)S+tI-r，1)，tSNumber of parallel symbols in a signal transmitted for a serving cell, tIThe number of parallel symbols in the transmitted signal for the interfering cell, r, is the total number of symbols on the kth RE, max (t)S+tI-r, 1) is taken to be tS+tI-a maximum value between r and 1.
In practical application, n is in formula (13)
Figure BDA0001335193890000173
The number of non-0's in the first row.
As can be seen from equation (13), when solving the reliability metric value corresponding to the Rank1 transmission mode, the reliability metric value corresponding to the SFBC transmission mode, and the reliability metric value corresponding to the Rank2 transmission mode, it is only necessary to traverse the first n symbols and then tS+tIThe n symbols are directly needed to be hard-judged, so the computation complexity of blind detection of the interference cell can be further reduced.
In a specific implementation, when detecting a modulation scheme corresponding to a dedicated reference signal of an interfering cell, the following constellation diagram may be used: when the gain is-3 dB, the corresponding constellation diagram is obtained by multiplying the first scale factor by the initial constellation diagram; when the gain is 3dB, the corresponding constellation diagram is obtained by multiplying the second scale factor by the initial constellation diagram; when the gain is 0dB, the corresponding constellation diagram is obtained by multiplying the third scale factor by the initial constellation diagram, and the first scale factor is smaller than the third scale factor which is smaller than the second scale factor.
In a specific implementation, the first scaling factor is 0.7079, the second scaling factor is 1.4125, and the third scaling factor is 1.
It can be understood that, in practical applications, the first scaling factor, the second scaling factor, and the third scaling factor may also be other values, and may be set according to a specific application scenario, as long as the first scaling factor is smaller than the third scaling factor and the third scaling factor is smaller than the second scaling factor, which is not described herein again.
Referring to fig. 2, an embodiment of the present invention provides a user terminal 20, including: a receiving unit 201, a determining unit 202 and a detecting unit 203, wherein:
a receiving unit 201, configured to receive a pilot signal sent by a base station, where the pilot signal includes a dedicated reference signal of an interfering cell;
a determining unit 202, configured to determine, under a preset condition, a transmission mode and a precoding matrix index of the interfering cell according to the dedicated reference signal of the interfering cell;
a detecting unit 203, configured to detect, according to the transmission mode and the precoding matrix index of the interfering cell, a modulation scheme corresponding to the dedicated reference signal of the interfering cell and RE transmission power corresponding to the dedicated reference signal of the interfering cell.
Optionally, the preset condition may include: setting the modulation mode of the received reference signal special for the interference cell as a first modulation mode, wherein the ratio of the service signal transmitting power of the interference cell to the pilot signal transmitting power is a first value.
Optionally, the determining unit 202 may be configured to determine whether a transmission mode of the interfering cell is a first transmission mode; when the transmission mode of the interference cell is a first transmission mode, acquiring a precoding matrix index corresponding to the first transmission mode; when the transmission mode of the interference cell is not the first transmission mode, judging whether the transmission mode of the interference cell is the second transmission mode; when the transmission mode of the interference cell is the second transmission mode, acquiring a precoding matrix index corresponding to the second transmission mode; when the transmission mode of the interfering cell is not the second transmission mode, determining that the transmission mode dedicated to the interfering cell is a third transmission mode, and acquiring a precoding matrix index corresponding to the third transmission mode.
Optionally, the first transmission mode, the second transmission mode, and the third transmission mode are any one of the following modes and are different: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode.
Optionally, the determining unit 202 may be configured to, when the first transmission mode is a Rank1 transmission mode, obtain all precoding matrices corresponding to the Rank1 transmission mode; calculating a corresponding reliability metric value when the transmission mode of the interference cell is a Rank1 transmission mode; and when the reliability metric value corresponding to the Rank1 transmission mode is smaller than a preset Rank1 transmission mode threshold value, determining that the transmission mode of the interference cell is the Rank1 transmission mode.
Optionally, the determining unit 202 may be configured to calculate metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode; calculating the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode, and selecting the minimum value from the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; and dividing the minimum value and the obtained sum value to obtain a reliability metric value corresponding to the Rank1 transmission mode.
Optionally, the determining unit 202 may be configured to calculate metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode by using the following formula:
Figure BDA0001335193890000191
wherein EDk,iA metric value corresponding to an ith precoding matrix corresponding to the Rank1 transmission mode; i is Rank1 transmission modeThe precoding matrix index corresponding to the formula is shown in the specification, i is an integer and is more than or equal to 0 and less than or equal to 3; k is an identifier of an RE carrying a dedicated reference signal of the interfering cell; r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000192
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000193
a precoding matrix for the serving cell,
Figure BDA0001335193890000194
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 BDA0001335193890000195
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000196
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000197
a data signal transmitted for an interfering cell;
Figure BDA0001335193890000198
to seek
Figure BDA0001335193890000199
Corresponds to the minimum value of
Figure BDA00013351938900001910
And calculating the reliability metric value corresponding to the Rank1 transmission mode by adopting the following formula:
Figure BDA0001335193890000201
wherein EDrank1For the reliability metric corresponding to Rank1 transmission mode,
Figure BDA0001335193890000202
to take the minimum value of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode,
Figure BDA0001335193890000203
the sum of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode.
Optionally, the determining unit 202 may be configured to, when it is determined that the first transmission mode is a Rank1 transmission mode, determine a precoding matrix index value of the interfering cell in a Rank1 transmission mode by using the following formula:
Figure BDA0001335193890000204
wherein the content of the first and second substances,
Figure BDA0001335193890000205
to get
Figure BDA0001335193890000206
The value of i corresponds to the minimum value.
Optionally, the determining unit 202 may be configured to calculate a reliability metric value corresponding to that the transmission mode of the interfering cell is an SFBC transmission mode when the second transmission mode is the SFBC transmission mode; and when the reliability metric value corresponding to the SFBC transmission mode is larger than a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is the SFBC transmission mode.
Optionally, the determining unit 202 may be configured to calculate a reliability metric value corresponding to the transmission mode of the interfering cell being an SFBC transmission mode by using the following formula:
Figure BDA0001335193890000207
wherein EDSFBCA reliability metric value corresponding to the SFBC transmission mode,rkfor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000208
to estimate the channel matrix of the serving cell,
Figure BDA0001335193890000209
a precoding matrix for the serving cell,
Figure BDA00013351938900002010
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 BDA00013351938900002011
obtaining a channel matrix of an interference cell by estimation;
Figure BDA00013351938900002012
a precoding matrix with index i for the interfering cell,
Figure BDA00013351938900002013
a data signal transmitted for an interfering cell; ED (electronic device)rank1A reliability metric corresponding to the Rank1 transmission mode.
Optionally, the determining unit 202 may be configured to determine, when the third transmission mode is a Rank2 transmission mode, that a precoding matrix index corresponding to the Rank2 transmission mode is:
Figure BDA0001335193890000211
wherein r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure BDA0001335193890000212
for estimated servicesThe channel matrix of the cell is determined,
Figure BDA0001335193890000213
a precoding matrix for the serving cell,
Figure BDA0001335193890000214
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 BDA0001335193890000215
obtaining a channel matrix of an interference cell by estimation;
Figure BDA0001335193890000216
a precoding matrix with index i for the interfering cell,
Figure BDA0001335193890000217
is a data signal transmitted by an interfering cell.
Optionally, the determining unit 202 may be configured to perform QR decomposition on a channel matrix for transmitting the pilot signal; traversing the constellation points of the modulation types of the first n symbols, and counting the last ts+tI-making hard decisions on r symbols, determining the transmission mode and precoding index matrix of the interfering cell; where n is max (t)s+tI-r，1)，tsNumber of symbols transmitted in parallel for the serving cell, tIR is the total number of symbols in the RE for the number of symbols transmitted in parallel by the interfering cell.
Optionally, the determining unit 202 may be configured to detect a modulation scheme corresponding to the dedicated reference signal of the interfering cell by using the following constellation diagram: when the gain is-3 dB, the corresponding constellation diagram is obtained by multiplying the first scale factor by the initial constellation diagram; when the gain is 3dB, the corresponding constellation diagram is obtained by multiplying the second scale factor by the initial constellation diagram; when the gain is 0dB, the corresponding constellation diagram is obtained by multiplying the third scale factor by the initial constellation diagram; the first scaling factor is less than the third scaling factor, which is less than the second scaling factor.
Optionally, the first scaling factor is 0.7079, the second scaling factor is 1.4125, and the third scaling factor is 1.
The 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 blind detection of an interfering cell provided in any one of the above embodiments of the present invention 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 capable of being executed on the processor, and the processor executes any one of the steps of the interference cell blind detection method provided in the above embodiments of the present invention when executing the computer instructions.
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 (14)

1. A method for blind detection of an interfering cell, comprising:
receiving a pilot signal issued by a base station, wherein the pilot signal comprises a special reference signal of an interference cell;
under a preset condition, determining a transmission mode and a precoding matrix index of the interference cell according to the special reference signal of the interference cell; the preset conditions include: setting the modulation mode of the received reference signal special for the interference cell as a first modulation mode, and setting the transmission power of the service signal and the pilot signal of the interference cellThe ratio of the transmitting power is a first value; the determining the transmission mode and the precoding matrix index of the interfering cell includes: judging whether the transmission mode of the interference cell is a first transmission mode or not; when the transmission mode of the interference cell is a first transmission mode, acquiring a precoding matrix index corresponding to the first transmission mode; when the transmission mode of the interference cell is not the first transmission mode, judging whether the transmission mode of the interference cell is the second transmission mode; when the transmission mode of the interference cell is the second transmission mode, acquiring a precoding matrix index corresponding to the second transmission mode; when the transmission mode of the interference cell is not the second transmission mode, judging that the transmission mode special for the interference cell is a third transmission mode, and acquiring a precoding matrix index corresponding to the third transmission mode; the first transmission mode, the second transmission mode and the third transmission mode are any one of the following modes and are different from each other: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode; when the second transmission mode is the SFBC transmission mode, the determining whether the transmission mode of the interfering cell is the second transmission mode includes: calculating the reliability measurement value corresponding to the SFBC transmission mode as the transmission mode of the interference cell; when the reliability metric value corresponding to the SFBC transmission mode is larger than a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is the SFBC transmission mode; calculating the reliability metric value corresponding to the transmission mode of the interference cell as the SFBC transmission mode by adopting the following formula:
Figure FDA0003024545660000011
wherein EDSFBCA reliability metric, r, corresponding to the SFBC transmission modekFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA0003024545660000012
to estimate the channel matrix of the serving cell,
Figure FDA0003024545660000013
a precoding matrix for the serving cell,
Figure FDA0003024545660000014
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 FDA0003024545660000015
obtaining a channel matrix of an interference cell by estimation;
Figure FDA0003024545660000016
a precoding matrix with index i for the interfering cell,
Figure FDA0003024545660000017
a data signal transmitted for an interfering cell; ED (electronic device)rank1The reliability metric value corresponding to the Rank1 transmission mode;
and detecting a modulation mode corresponding to the special reference signal of the interference cell and RE transmitting power corresponding to the special reference signal of the interference cell according to the transmission mode and the precoding matrix index of the interference cell.
2. The method for blind detection of an interfering cell according to claim 1, wherein when the first transmission mode is a Rank1 transmission mode, the determining whether the transmission mode of the interfering cell is the first transmission mode comprises:
acquiring all precoding matrixes corresponding to the Rank1 transmission mode;
calculating a corresponding reliability metric value when the transmission mode of the interference cell is a Rank1 transmission mode;
when the reliability metric value corresponding to the Rank1 transmission mode is smaller than a preset Rank1 transmission mode threshold value, determining that the transmission mode of the interference cell is the Rank1 transmission mode;
the calculating the reliability metric value corresponding to the transmission mode of the interfering cell being the Rank1 transmission mode includes: calculating the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; calculating the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode, and selecting the minimum value from the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; dividing the minimum value and the obtained sum value to obtain a reliability metric value corresponding to the Rank1 transmission mode;
calculating the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode by adopting the following formula:
Figure FDA0003024545660000021
wherein EDk,iA metric value corresponding to an ith precoding matrix corresponding to the Rank1 transmission mode; i is a precoding matrix index corresponding to a Rank1 transmission mode, i is an integer and is more than or equal to 0 and less than or equal to 3; k is an identifier of an RE carrying a dedicated reference signal of the interfering cell; r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA0003024545660000022
to estimate the channel matrix of the serving cell,
Figure FDA0003024545660000023
a precoding matrix for the serving cell,
Figure FDA0003024545660000024
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 FDA0003024545660000025
obtaining a channel matrix of an interference cell by estimation;
Figure FDA0003024545660000026
a precoding matrix with index i for the interfering cell,
Figure FDA0003024545660000027
a data signal transmitted for an interfering cell;
Figure FDA0003024545660000028
to seek
Figure FDA0003024545660000029
Corresponds to the minimum value of
Figure FDA00030245456600000210
And calculating the reliability metric value corresponding to the Rank1 transmission mode by adopting the following formula:
Figure FDA0003024545660000031
wherein EDrank1For the reliability metric corresponding to Rank1 transmission mode,
Figure FDA0003024545660000032
to take the minimum value of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode,
Figure FDA0003024545660000033
the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode;
determining the precoding matrix index value of the interference cell in a Rank1 transmission mode by adopting the following formula:
Figure FDA0003024545660000034
wherein the content of the first and second substances,
Figure FDA0003024545660000035
to get
Figure FDA0003024545660000036
The value of i corresponds to the minimum value.
3. The method for blind detection of interfering cells according to claim 1, wherein when the third transmission mode is a Rank2 transmission mode, the precoding matrix index corresponding to the Rank2 transmission mode is:
Figure FDA0003024545660000037
wherein r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA0003024545660000038
to estimate the channel matrix of the serving cell,
Figure FDA0003024545660000039
a precoding matrix for the serving cell,
Figure FDA00030245456600000310
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 FDA00030245456600000311
obtaining a channel matrix of an interference cell by estimation;
Figure FDA00030245456600000312
a precoding matrix with index i for the interfering cell,
Figure FDA00030245456600000313
is a data signal transmitted by an interfering cell.
4. The method for blind detection of an interfering cell according to claim 1, wherein the determining the transmission mode and the precoding index matrix of the interfering cell comprises:
carrying out QR decomposition on a channel matrix for transmitting the pilot signal;
traversing the constellation points of the modulation types of the first n symbols, and counting the last ts+tI-making hard decisions on r symbols, determining the transmission mode and precoding index matrix of the interfering cell;
where n is max (t)s+tI-r，1)，tsNumber of symbols transmitted in parallel for the serving cell, tIR is the total number of symbols in the RE for the number of symbols transmitted in parallel by the interfering cell.
5. The method for blind detection of an interfering cell according to claim 4, wherein the detecting the modulation scheme corresponding to the dedicated reference signal of the interfering cell comprises:
detecting a modulation mode corresponding to the special reference signal of the interference cell by adopting the following constellation diagram: when the gain is-3 dB, the corresponding constellation diagram is obtained by multiplying the first scale factor by the initial constellation diagram; when the gain is 3dB, the corresponding constellation diagram is obtained by multiplying the second scale factor by the initial constellation diagram; when the gain is 0dB, the corresponding constellation diagram is obtained by multiplying the third scale factor by the initial constellation diagram; the first scaling factor is less than the third scaling factor, which is less than the second scaling factor.
6. The method of claim 5, wherein the first scaling factor is 0.7079, the second scaling factor is 1.4125, and the third scaling factor is 1.
7. A user terminal, comprising:
a receiving unit, configured to receive a pilot signal sent by a base station, where the pilot signal includes a dedicated reference signal of an interfering cell;
a determining unit, configured to determine, under a preset condition, a transmission mode and a precoding matrix index of the interfering cell according to the dedicated reference signal of the interfering cell; the preset conditions include: setting a modulation mode of the received interference cell dedicated reference signal as a first modulation mode, wherein the ratio of the service signal transmission power of the interference cell to the pilot signal transmission power is a first value; the determining the transmission mode and the precoding matrix index of the interfering cell includes: judging whether the transmission mode of the interference cell is a first transmission mode or not; when the transmission mode of the interference cell is a first transmission mode, acquiring a precoding matrix index corresponding to the first transmission mode; when the transmission mode of the interference cell is not the first transmission mode, judging whether the transmission mode of the interference cell is the second transmission mode; when the transmission mode of the interference cell is the second transmission mode, acquiring a precoding matrix index corresponding to the second transmission mode; when the transmission mode of the interference cell is not the second transmission mode, judging that the transmission mode special for the interference cell is a third transmission mode, and acquiring a precoding matrix index corresponding to the third transmission mode; the first transmission mode, the second transmission mode and the third transmission mode are any one of the following modes and are different from each other: a Rank1 transmission mode, a Rank2 transmission mode, and an SFBC transmission mode; when the second transmission mode is the SFBC transmission mode, the determining whether the transmission mode of the interfering cell is the second transmission mode includes: calculating the reliability measurement value corresponding to the SFBC transmission mode as the transmission mode of the interference cell; when the reliability metric value corresponding to the SFBC transmission mode is larger than a preset SFBC transmission mode threshold value, judging that the transmission mode of the interference cell is the SFBC transmission mode; calculating the corresponding reliability when the transmission mode of the interference cell is the SFBC transmission mode by adopting the following formulaThe sex metric value is as follows:
Figure FDA0003024545660000041
wherein EDSFBCA reliability metric, r, corresponding to the SFBC transmission modekFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA0003024545660000051
to estimate the channel matrix of the serving cell,
Figure FDA0003024545660000052
a precoding matrix for the serving cell,
Figure FDA0003024545660000053
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 FDA0003024545660000054
obtaining a channel matrix of an interference cell by estimation;
Figure FDA0003024545660000055
a precoding matrix with index i for the interfering cell,
Figure FDA0003024545660000056
a data signal transmitted for an interfering cell; ED (electronic device)rank1The reliability metric value corresponding to the Rank1 transmission mode;
a detecting unit, configured to detect, according to the transmission mode and the precoding matrix index of the interfering cell, a modulation mode corresponding to the dedicated reference signal of the interfering cell and RE transmission power corresponding to the dedicated reference signal of the interfering cell.
8. The user terminal of claim 7, wherein the determining unit is configured to obtain all precoding matrices corresponding to the Rank1 transmission mode when the first transmission mode is a Rank1 transmission mode; calculating a corresponding reliability metric value when the transmission mode of the interference cell is a Rank1 transmission mode; when the reliability metric value corresponding to the Rank1 transmission mode is smaller than a preset Rank1 transmission mode threshold value, determining that the transmission mode of the interference cell is the Rank1 transmission mode; the calculating the reliability metric value corresponding to the transmission mode of the interfering cell being the Rank1 transmission mode includes: calculating the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; calculating the sum of the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode, and selecting the minimum value from the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode; dividing the minimum value and the obtained sum value to obtain a reliability metric value corresponding to the Rank1 transmission mode; calculating the metric values corresponding to all precoding matrixes corresponding to the Rank1 transmission mode by adopting the following formula:
Figure FDA0003024545660000057
wherein EDk,iA metric value corresponding to an ith precoding matrix corresponding to the Rank1 transmission mode; i is a precoding matrix index corresponding to a Rank1 transmission mode, i is an integer and is more than or equal to 0 and less than or equal to 3; k is an identifier of an RE carrying a dedicated reference signal of the interfering cell; r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA0003024545660000058
to estimate the channel matrix of the serving cell,
Figure FDA0003024545660000059
a precoding matrix for the serving cell,
Figure FDA00030245456600000510
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 FDA00030245456600000511
obtaining a channel matrix of an interference cell by estimation;
Figure FDA00030245456600000512
a precoding matrix with index i for the interfering cell,
Figure FDA00030245456600000513
a data signal transmitted for an interfering cell;
Figure FDA00030245456600000514
to seek
Figure FDA0003024545660000061
Corresponds to the minimum value of
Figure FDA0003024545660000062
And calculating the reliability metric value corresponding to the Rank1 transmission mode by adopting the following formula:
Figure FDA0003024545660000063
wherein EDrank1For the reliability metric corresponding to Rank1 transmission mode,
Figure FDA0003024545660000064
to take the minimum value of the metric values corresponding to all precoding matrices corresponding to the Rank1 transmission mode,
Figure FDA0003024545660000065
all precoding matrixes corresponding to the Rank1 transmission modeThe sum of the corresponding metric values; determining the precoding matrix index value of the interference cell in a Rank1 transmission mode by adopting the following formula:
Figure FDA0003024545660000066
wherein the content of the first and second substances,
Figure FDA0003024545660000067
to get
Figure FDA0003024545660000068
The value of i corresponds to the minimum value.
9. The user terminal of claim 7, wherein the determining unit is configured to determine, when the third transmission mode is a Rank2 transmission mode, a precoding matrix index corresponding to the Rank2 transmission mode as:
Figure FDA0003024545660000069
wherein r iskFor the signal vector received at the kth RE, pSIs the ratio of the traffic signal transmit power to the pilot signal transmit power of the serving cell,
Figure FDA00030245456600000610
to estimate the channel matrix of the serving cell,
Figure FDA00030245456600000611
a precoding matrix for the serving cell,
Figure FDA00030245456600000612
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 FDA00030245456600000613
obtaining a channel matrix of an interference cell by estimation;
Figure FDA00030245456600000614
a precoding matrix with index i for the interfering cell,
Figure FDA00030245456600000615
is a data signal transmitted by an interfering cell.
10. The user terminal of claim 7, wherein the determining unit is configured to perform QR decomposition on a channel matrix for transmitting the pilot signal; traversing the constellation points of the modulation types of the first n symbols, and counting the last ts+tI-making hard decisions on r symbols, determining the transmission mode and precoding index matrix of the interfering cell; where n is max (t)s+tI-r，1)，tsNumber of symbols transmitted in parallel for the serving cell, tIR is the total number of symbols in the RE for the number of symbols transmitted in parallel by the interfering cell.
11. The ue of claim 10, wherein the determining unit is configured to detect the modulation scheme corresponding to the dedicated reference signal of the interfering cell by using the following constellation diagram: when the gain is-3 dB, the corresponding constellation diagram is obtained by multiplying the first scale factor by the initial constellation diagram; when the gain is 3dB, the corresponding constellation diagram is obtained by multiplying the second scale factor by the initial constellation diagram; when the gain is 0dB, the corresponding constellation diagram is obtained by multiplying the third scale factor by the initial constellation diagram; the first scaling factor is less than the third scaling factor, which is less than the second scaling factor.
12. The user terminal of claim 11, wherein the first scaling factor is 0.7079, the second scaling factor is 1.4125, and the third scaling factor is 1.
13. A computer-readable storage medium, having a computer program stored thereon, wherein the computer program, when being executed by a processor, is configured to perform the steps of the interfering cell blind detection method according to any one of claims 1 to 6.
14. 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 steps of the interfering cell blind detection method according to any one of claims 1 to 6.
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