CN104579544B - L TE TM3 mode CQI or RI selection method and system - Google Patents

L TE TM3 mode CQI or RI selection method and system Download PDF

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CN104579544B
CN104579544B CN201310513200.2A CN201310513200A CN104579544B CN 104579544 B CN104579544 B CN 104579544B CN 201310513200 A CN201310513200 A CN 201310513200A CN 104579544 B CN104579544 B CN 104579544B
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sinr
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康国庆
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Leadcore Technology 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

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Abstract

The invention provides a CQI or RI selection method and a system under L TE (TM) 3 mode, which comprises the steps of obtaining a pre-coded data matrix according to PMI (precoding matrix indicator) information, obtaining equivalent channel estimation of each pilot RS channel of each resource block in a downlink according to an original channel estimation matrix of each pilot RS channel in each resource block and the pre-coded data matrix, calculating demodulation SINR of a first layer of each pilot RS channel according to the equivalent channel estimation of each pilot RS channel, and comparing the demodulation SINR of the first layer of two pilot RS channels in each resource block.

Description

CQI or RI selection method and system under LTE TM3 mode
Technical Field
The invention relates to a CQI or RI selection method and a system in an LTE TM3 mode.
Background
LTE is a wideband OFDM MIMO system, in which LTE UEs (User Equipment) periodically or aperiodically feed back Channel State Information (CSI) to the network side or eNodeB. Wherein the CSI includes RI (Rank Indicator), PMI (Precoding Matrix Index), and CQI (Channel Quality Indicator). The reporting of the CQI determines the code rate and the modulation mode of a transmission block of UE scheduled by the eNodeB, so whether the reporting of the CQI has an important influence on the transmission rate of the UE or not.
The LTE system adopts a Precoding technology combining a linear Precoding technology and a limited feedback technology, the eNodeB and the terminal jointly maintain a set of codebook set, and Precoding matrixes (Precoding Matrix) in the codebook set are indicated through the PMI. However, in the LTE system TM3 (OLSM) mode, the eNodeB does not need the terminal to feed back the PMI, and the base station alternately uses precoding matrices in a codebook set according to a certain scheme. In the LTE system, the CQI is calculated according to the current transmission mode and the optimal RI and PMI of the current channel, so for the TM3 mode, how to select the PMI to be used for CQI calculation is a key issue, because the gains of selecting different PMIs may be greatly different due to the influence of the radio channel correlation, and thus the selected CQIs may also be greatly different.
When the demodulation SINR is calculated, the values of the delay matrix D (i) and the number i of the data are different, so that equivalent channel estimation matrixes of different data numbers are different, and the calculated demodulation SINR is different. In practice, the demodulation SINR is calculated using the channel estimation matrix of the pilot RS. At this time, how to select the delay matrix is not specified in the protocol of 3GPP, and the terminal needs to select according to the characteristics of its own algorithm. Therefore, the selection method of different delay matrices D (i) has an important influence on the terminal to calculate the demodulation SINR and finally report the appropriate CQI.
Disclosure of Invention
The invention aims to provide a CQI or RI selection method and a system in an LTE TM3 mode, which can feed back a reasonable CQI value or RI value.
In order to solve the above problem, the present invention provides a CQI selection method in LTE TM3 mode, including:
obtaining a pre-coded data matrix according to the PMI information;
obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
comparing the demodulation SINR of the first layer of the two pilot frequency RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINR of the first layer of the two pilot frequency RS channels is less than or equal to a first preset threshold value, the corrected demodulation SINR is the average value of the demodulation SINR of the first layer of the two pilot frequency RS channels, otherwise, the corrected demodulation SINR is the smaller one of the demodulation SINR of the first layer of the two pilot frequency RS channels;
and obtaining the CQI in the LTE TM3 mode according to the corrected demodulation SINR.
Further, in the method, in the step of obtaining the precoded data matrix according to the PMI information, when the number of the transmit antennas is 2 and the ri is 2, the calculation formula is as follows:
wherein the content of the first and second substances,representing the pre-coded data matrix of the data,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Further, in the above method, in the step of obtaining the equivalent channel estimation of each pilot RS channel of each resource block in the downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix, the calculation formula is as follows:
H eff (2i')、H eff (2 i ' + 1) respectively represents equivalent channel estimates for two pilot RS channels in each Resource Block (RB), H (2 i ' + 1) respectively represents the original channel estimation matrices for two pilot RS channels in each resource block, i ' represents the resource block number, i =2i ',2i ' +1.
Further, in the above method, comparing the demodulation SINR of the first layer of the two pilot RS channels in each resource block, if the absolute value of the difference between the demodulation SINRs of the first layers of the two pilot RS channels is less than or equal to a first preset threshold, the modified demodulation SINR is the average value of the demodulation SINRs of the first layers of the two pilot RS channels, otherwise, in the step where the modified demodulation SINR is the smaller of the demodulation SINRs of the first layers of the two pilot RS channels, the calculation formula is as follows:
SINR (2 i '), SINR (2 i' + 1) is the demodulated SINR of the first layer of two pilot RS channels, SINR TH1 For the first predetermined threshold, SINR RB (i') is the demodulated SINR after the correction.
The invention also provides an RI selection method in an LTE TM3 mode, which comprises the following steps:
obtaining a pre-coded data matrix according to the PMI information;
obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
and comparing the demodulation SINRs of the first layer of the two pilot frequency RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINRs of the first layer of the two pilot frequency RS channels is less than or equal to a second preset threshold, the reporting value of the RI is 2, otherwise, the reporting value of the RI is 1.
Further, in the method, in the step of obtaining the precoded data matrix according to the PMI information, when the number of the transmit antennas is 2 and the ri is 2, the calculation formula is as follows:
wherein the content of the first and second substances,representing the pre-coded data matrix of the data,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Further, in the method, in the step of obtaining the equivalent channel estimation of each pilot RS channel of each resource block in the downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix, the calculation formula is as follows:
H eff (2i')、H eff (2 i ' + 1) respectively represents equivalent channel estimates for two pilot RS channels in each Resource Block (RB), H (2 i ' + 1) respectively represents the original channel estimation matrices for two pilot RS channels in each resource block, i ' represents the resource block number, i =2i ',2i ' +1.
According to another aspect of the present invention, there is provided a CQI selection system in LTE TM3 mode, comprising:
the first matrix module is used for obtaining a pre-coded data matrix according to the PMI information;
the second matrix module is used for obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
the first demodulation SINR acquisition module is used for calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
the second demodulation SINR acquisition module is used for comparing the demodulation SINR of the first layer of the two pilot frequency RS channels in each resource block, if the absolute value of the difference value of the demodulation SINR of the first layer of the two pilot frequency RS channels is less than or equal to a first preset threshold value, the corrected demodulation SINR is the average value of the demodulation SINR of the first layer of the two pilot frequency RS channels, otherwise, the corrected demodulation SINR is the smaller one of the demodulation SINR of the first layer of the two pilot frequency RS channels;
and the CQI selection module is used for obtaining the CQI in the LTE TM3 mode according to the corrected demodulation SINR.
Further, in the above system, when the number of transmit antennas is 2 and the number of ri is 2, the calculation formula adopted by the first matrix module is as follows:
wherein the content of the first and second substances,represents the pre-coded data matrix and the pre-coded data matrix,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Further, in the above system, the calculation formula adopted by the second matrix module is as follows:
H eff (2i')、H eff (2 i ' + 1) respectively represents equivalent channel estimates for two pilot RS channels in each Resource Block (RB), H (2 i ' + 1) respectively represents the original channel estimation matrices for two pilot RS channels in each resource block, i ' represents the resource block number, i =2i ',2i ' +1.
Further, in the above system, the calculation formula adopted by the first demodulation SINR obtaining module is as follows:
SINR (2 i '), SINR (2 i' + 1) is the demodulated SINR of the first layer of the two pilot RS channels, SINR TH1 For the first predetermined threshold, SINR RB (i') is the demodulated SINR after the correction.
The invention also provides an RI selection system in LTE TM3 mode, comprising:
the first matrix module is used for obtaining a precoded data matrix according to the PMI information;
the second matrix module is used for obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
the first demodulation SINR acquisition module is used for calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
and the RI selection module is used for comparing the demodulation SINRs of the first layers of the two pilot frequency RS channels in each resource block, if the absolute value of the difference value of the demodulation SINRs of the first layers of the two pilot frequency RS channels is less than or equal to a second preset threshold value, the reporting value of the RI is 2, otherwise, the reporting value of the RI is 1.
Further, in the above system, when the number of transmit antennas is 2 and the number of ri is 2, the calculation formula adopted by the first matrix module is as follows:
wherein the content of the first and second substances,representing the pre-coded data matrix of the data,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Further, in the above system, the calculation formula adopted by the second matrix module is as follows:
H eff (2i')、H eff (2 i ' + 1) respectively represents equivalent channel estimates for two pilot RS channels in each Resource Block (RB), H (2 i ' + 1) respectively represents the original channel estimation matrices for two pilot RS channels in each resource block, i ' represents the resource block number, i =2i ',2i ' +1.
Compared with the prior art, the method and the device have the advantages that the pre-coded data matrix is obtained according to the PMI information; obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in the downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix; calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel; comparing the demodulation SINRs of the first layers of the two pilot frequency RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINRs of the first layers of the two pilot frequency RS channels is smaller than or equal to a first preset threshold value, the corrected demodulation SINR is the average value of the demodulation SINRs of the first layers of the two pilot frequency RS channels, otherwise, the corrected demodulation SINR is the smaller one of the demodulation SINRs of the first layers of the two pilot frequency RS channels; obtaining CQI in an LTE TM3 mode according to the corrected demodulation SINR, or comparing the demodulation SINR of the first layer of the two pilot RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINRs of the first layer of the two pilot RS channels is less than or equal to a second preset threshold value, the reporting value of the RI is 2, otherwise, the reporting value of the RI is 1, so that the UE can obtain a more accurate SINR estimation value to faithfully feed back the current downlink Channel State Information (CSI) condition of the UE, and feed back a reasonable CQI value or RI value, thereby enabling downlink scheduling to be more reasonable, and further improving downlink throughput and the rate of the UE as much as possible.
Drawings
FIG. 1 is a flow chart of a CQI selection method in LTE TM3 mode according to an embodiment of the present invention;
fig. 2 is a flowchart of an RI selection method in LTE TM3 mode according to an embodiment of the present invention;
FIG. 3 is a block diagram of a CQI selection system in LTE TM3 mode in accordance with an embodiment of the present invention;
fig. 4 is a block diagram of an RI selection system in LTE TM3 mode according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example one
As shown in fig. 1, the present invention provides a CQI selection method in LTE TM3 mode, which includes steps S11 to S17.
Step S11, obtaining a data matrix after precoding according to the PMI information;
preferably, in step S11, when the number of transmit antennas is 2 and the number of ri is 2, the LTE large delay CDD precoding process may be expressed as the following calculation formula:
wherein the content of the first and second substances,represents the precoded data matrix, [ x ] (0) (i),x (1) (i)] T Representing the pre-encoded data vector(s),represents the layer mapped data matrix, [ s ] (0) (i),s (1) (i)] T Represents a layer mapped data vector, W (i) is a 2 x 2 codebook matrix,d (i) is a 2 x 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Step S12, obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in the downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the data matrix after precoding;
preferably, the calculation formula in step S12 is as follows:
H eff (2i')、H eff (2 i ' + 1) respectively represents equivalent channel estimates for two pilot RS channels in each Resource Block (RB), H (2 i ' + 1) respectively represents the original channel estimation matrices for two pilot RS channels in each resource block, i ' represents the resource block number, i =2i ',2i ' +1. Specifically, the CQI is a reflection of demodulation capability of the terminal for a PDSCH channel (physical downlink shared channel) in the current channel environment, and therefore, the CQI selection is usually based on an estimate of the demodulation SINR. In the implementation process, the UE firstly estimates the demodulation SINR estimated by the pilot RS channel, and then converts the demodulation SINR of the PDSCH channel by combining the power difference between the PDSCH channel and the pilot RS. When calculating the demodulation SINR of the channel estimation of the pilot RS, the influence of the precoded data matrix must be considered, and the general processing method is to first perform precoding on the precoded data matrixThe influence is reflected to the equivalent channel estimation of the pilot RS channel, the equivalent channel estimation of each pilot RS channel is obtained, and then the demodulation SINR of the equivalent channel estimation is calculated. The LTE open-loop spatial multiplexing precoding has the advantages that the transmitting end and the receiving end directly carry out transmitting and receiving operations according to a predefined precoding matrix and are irrelevant to real-time channel information. In LTE systems, open-loop spatial multiplexing is typically used in conjunction with large-delay CDD techniques. Assuming that the channel matrix is H (i), the data received by the UE can be expressed as:
when i%2=0, H eff (i) Can be expressed as:
when i%2=1, H eff (i) Can be expressed as:
when calculating the demodulation SINR, H must be estimated based on the equivalent channel eff (i) And the equivalent channel estimation value H eff (i) Which differs with the number i of the data. Let the system bandwidth be N, i.e., there are N RBs downstream, and each RB has an original channel estimation matrix of 2 RSs, denoted as H (2 i '), H (2 i ' + 1), where i ' denotes RB number, i =0, 1.
Step S13, calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel; in particular, according to H eff Calculating the demodulation SINR of the first layer of the RS of each RB (in the TM3 mode, only the CQI of the first layer needs to be reported in the protocol), and respectively recording as: SINR (2 i '), SINR (2 i' + 1)
Step S14, comparing the demodulation SINR of the first layer of the two pilot frequency RS channels in each resource block, if the absolute value of the difference value of the demodulation SINR of the first layer of the two pilot frequency RS channels is less than or equal to a first preset threshold value, turning to step S15, otherwise, turning to step S16;
step S15, the corrected demodulation SINR is the average value of the demodulation SINRs of the first layer of the two pilot RS channels;
step S16, the corrected demodulation SINR is the smaller of the demodulation SINRs of the first layer of the two pilot RS channels;
preferably, the calculation formula in steps S14 to S16 is as follows:
SINR (2 i '), SINR (2 i' + 1) is the demodulated SINR of the first layer of two pilot RS channels, SINR TH1 Is the first preset threshold value, SINR RB (i') is the demodulated SINR after the correction. Specifically, in the LTE system, 2 RSs within one RB are within the relevant bandwidth, so the demodulation SINRs of the original channel estimates of the 2 RSs should not differ much. However, when 2 RSs use different equivalent precoding matrices, if the demodulation SINRs of the two RSs have a large difference, it indicates that the correlation of the channel is high, and the influence of the precoding matrix on the channel is large, and at this time, the difference between the equivalent channel estimation and the actual channel estimation is large. Therefore, the correlation of the channel can be determined based on the difference between the SINR (2 i ') and the SINR (2 i' + 1). Then different feedback strategies are selected according to different channel correlations. Considering the precoding scheme of LTE TM3, the data part uses 2 precoding delay matrices alternately according to the number of data. When the correlation of the channel is high, the precoding method may cause large fluctuation of the demodulated SINR of the data. Therefore, when the correlation of the channel is high, the CQI reporting method needs to be considered especially, and a more conservative CQI reporting strategy is generally used. According to the discrimination of the channel correlation, a reasonable calculation method for calculating the SINR of the CQI is as follows:
the meaning of the above formula is: when the channel estimation of 2 RSs of the same RB uses the calculated equivalent channel estimation of different precoding delay matrixes, the demodulation SINR is further calculated, and if the difference of the 2 SINRs is not large, the demodulation SINR of the RB is the average of the demodulation SINRs of the 2 RSs; if the 2 SIRNs differ greatly, the demodulation SINR of the RB is the smaller of the demodulation SINRs of the 2 RSs. Therefore, the CQI reporting under a low correlation channel is ensured to be proper and not to be conservative, the CQI reporting under a channel with higher correlation is not accelerated, and the performance of the terminal is ensured. SINR TH1 A threshold value representing the difference in the calculated demodulated SINRs using different precoding delay matrices may be obtained by simulation.
And S17, obtaining the CQI in the LTE TM3 mode according to the corrected demodulation SINR.
According to the embodiment, the channel correlation is determined according to the difference of the demodulation SINR calculated by different precoding delay matrixes, and the demodulation SINR in one RB can be accurately reflected, so that the CQI reporting accuracy is ensured. The embodiment only describes the TM3 scene of 2 × 2, and the embodiment is also applicable to the TM3 scenes of 4 × 2 and 4 × 4.
Example two
As shown in fig. 2, the present invention further provides an RI selection method in the LTE TM3 mode, which includes steps S21 to S24.
Step S21, obtaining a data matrix after precoding according to the PMI information;
preferably, in step S21, when the number of transmit antennas is 2 and the number of ri is 2, the calculation formula is as follows:
wherein the content of the first and second substances,representing precoded data momentsThe number of the arrays is determined,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Step S22, obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in the downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
preferably, in step S22, the calculation formula is as follows:
H eff (2i')、H eff (2 i '+ 1) represents the equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), respectively, H (2 i'), H (2 i '+ 1) represents the original channel estimation matrices for the two pilot RS channels in each resource block, respectively, i' represents the resource block number, i =2i ',2i' +1.
Step S23, calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
step S24, comparing the demodulation SINR of the first layer of the two pilot RS channels in each resource block, if the demodulation SINR of the first layer of the two pilot RS channelsAnd adjusting the absolute value of the difference value of the SINR to be smaller than or equal to a second preset threshold, wherein the reported value of the RI is 2, and otherwise, the reported value of the RI is 1. Specifically, the core of the MIMO technology is spatial multiplexing by using weak correlation of wireless spatial channels. The magnitude of the channel correlation determines whether the wireless channel is suitable for spatial multiplexing. Therefore, the method for calculating demodulation SINR by using different precoding delay matrices and distinguishing spatial correlation according to the SINR difference, which is proposed in the first embodiment, can also be used for reporting the terminal RI. I.e. when satisfying | SINR (2 i) -SINR (2i + 1) |>SINR TH2 Then, the spatial correlation is considered to be already very high, and is no longer suitable for spatial multiplexing transmission, and the RI report value is 1 at this time.
Since LTE is a wideband system, the selection of RI should be based on the channel correlation of the entire wideband, and this embodiment only describes how to calculate the correlation of one RB. There are many methods how to determine the wideband channel correlation, for example, determining the correlation of the entire bandwidth according to the number of RBs with higher channel correlation in the entire bandwidth, and then performing RI selection. Other embodiments will not be described in detail in this embodiment.
The present embodiment calculates the channel correlation of each RB, calculates the channel correlation of the entire bandwidth according to the channel correlation of each RB, and performs RI selection. For details of the second embodiment, reference may be made to corresponding parts of the first embodiment, which are not described herein again.
EXAMPLE III
As shown in fig. 3, the present invention further provides another CQI selection system in LTE TM3 mode, including:
the first matrix module 1 is configured to obtain a precoded data matrix according to the PMI information;
a second matrix module 2, configured to obtain an equivalent channel estimation of each pilot RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix;
a first demodulation SINR obtaining module 3, configured to calculate a demodulation SINR of the first layer of each pilot RS channel according to the equivalent channel estimation of each pilot RS channel;
a second demodulation SINR obtaining module 4, configured to compare the demodulation SINR of the first layer of the two pilot RS channels in each resource block, where if the absolute value of the difference between the demodulation SINRs of the first layer of the two pilot RS channels is less than or equal to a first preset threshold, the corrected demodulation SINR is the average value of the demodulation SINRs of the first layer of the two pilot RS channels, and otherwise, the corrected demodulation SINR is the smaller one of the demodulation SINRs of the first layer of the two pilot RS channels;
and a CQI selecting module 5, configured to obtain a CQI in the LTE TM3 mode according to the modified demodulation SINR.
Preferably, when the number of transmit antennas is 2 and the number of ri is 2, the first matrix module 1 adopts the following calculation formula:
wherein, the first and the second end of the pipe are connected with each other,represents the pre-coded data matrix and the pre-coded data matrix,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Preferably, the calculation formula adopted by the second matrix module 2 is as follows:
H eff (2i')、H eff (2 i '+ 1) represents the equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), respectively, H (2 i'), H (2 i '+ 1) represents the original channel estimation matrices for the two pilot RS channels in each resource block, respectively, i' represents the resource block number, i =2i ',2i' +1.
Preferably, the calculation formula adopted by the first demodulation SINR obtaining module 3 is as follows:
SINR (2 i '), SINR (2 i' + 1) is the demodulated SINR of the first layer of two pilot RS channels, SINR TH1 Is the first preset threshold value, SINR RB (i') is the demodulated SINR after the correction.
For details of other embodiments, reference may be made to corresponding parts of embodiment one, and details are not described herein.
According to the embodiment, the channel correlation is determined according to the difference of the demodulation SINR calculated by different precoding delay matrixes, and the demodulation SINR in one RB can be accurately reflected, so that the CQI reporting accuracy is ensured. The embodiment only describes the TM3 scene of 2 × 2, and the embodiment is also applicable to the TM3 scenes of 4 × 2 and 4 × 4.
Example four
As shown in fig. 4, the present invention further provides another RI selection system in LTE TM3 mode, including:
the first matrix module 1 is configured to obtain a precoded data matrix according to the PMI information;
a second matrix module 2, configured to obtain an equivalent channel estimation of each pilot RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix;
a first demodulation SINR obtaining module 3, configured to calculate a demodulation SINR of the first layer of each pilot RS channel according to the equivalent channel estimation of each pilot RS channel;
and the RI selection module 6 is configured to compare the demodulation SINR of the first layer of the two pilot RS channels in each resource block, and if the absolute value of the difference between the demodulation SINRs of the first layers of the two pilot RS channels is less than or equal to a second preset threshold, the reporting value of the RI is 2, otherwise, the reporting value of the RI is 1.
Preferably, when the number of transmit antennas is 2 and the number of ri is 2, the first matrix module 1 adopts the following calculation formula:
wherein, the first and the second end of the pipe are connected with each other,represents the pre-coded data matrix and the pre-coded data matrix,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i represents the number of resource blocks, and W (i) D (i) U is obtained according to the PMI information.
Preferably, the calculation formula adopted by the second matrix module 2 is as follows:
H eff (2i')、H eff (2 i '+ 1) represents the equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), respectively, H (2 i'), H (2 i '+ 1) represents the original channel estimation matrices for the two pilot RS channels in each resource block, respectively, i' represents the resource block number, i =2i ',2i' +1.
The present embodiment calculates the channel correlation of each RB, calculates the channel correlation of the entire bandwidth according to the channel correlation of each RB, and performs RI selection. For details of other embodiments, reference may be made to corresponding parts of embodiment two, which are not described herein again.
In the invention, a pre-coded data matrix is obtained according to PMI information; obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix; calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel; comparing the demodulation SINRs of the first layers of the two pilot frequency RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINRs of the first layers of the two pilot frequency RS channels is smaller than or equal to a first preset threshold value, the corrected demodulation SINR is the average value of the demodulation SINRs of the first layers of the two pilot frequency RS channels, otherwise, the corrected demodulation SINR is the smaller one of the demodulation SINRs of the first layers of the two pilot frequency RS channels; obtaining CQI in an LTE TM3 mode according to the corrected demodulation SINR, or comparing the demodulation SINR of the first layer of the two pilot RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINRs of the first layer of the two pilot RS channels is less than or equal to a second preset threshold value, the reporting value of RI is 2, otherwise, the reporting value of RI is 1, so that the UE can obtain a more accurate SINR estimation value to faithfully feed back the current downlink Channel State Information (CSI) condition of the UE, and feed back a reasonable CQI value or RI value, so that downlink scheduling is more reasonable, and downlink throughput and the rate of the UE are improved as much as possible
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (14)

1. A CQI selection method in an LTE TM3 mode, comprising:
obtaining a pre-coded data matrix according to the PMI information;
obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
comparing the demodulation SINR of the first layer of the two pilot frequency RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINR of the first layer of the two pilot frequency RS channels is less than or equal to a first preset threshold value, the corrected demodulation SINR is the average value of the demodulation SINR of the first layer of the two pilot frequency RS channels, otherwise, the corrected demodulation SINR is the smaller one of the demodulation SINR of the first layer of the two pilot frequency RS channels;
and obtaining the CQI in the LTE TM3 mode according to the corrected demodulation SINR.
2. The CQI selection method in LTE TM3 mode as claimed in claim 1, wherein in the step of obtaining the precoded data matrix according to the PMI information, when the number of transmit antennas is 2 and the number of ri is 2, the calculation formula is as follows:
wherein the content of the first and second substances,represents the pre-coded data matrix and the pre-coded data matrix,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i =2i ',2i ' +1, i ' represents a resource block number,and W (i) D (i) U is obtained according to the PMI information.
3. The method for selecting CQI in LTE TM3 mode as claimed in claim 2, wherein in the step of obtaining the equivalent channel estimation of each pilot RS channel of each resource block in downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix, the calculation formula is as follows:
H eff (2i')、H eff (2 i ' + 1) represents the equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), respectively, and H (2 i '), H (2 i ' + 1) represent the original channel estimation matrices for the two pilot RS channels in each resource block, respectively.
4. The method of claim 3, wherein the comparing the demodulation SINR of the first layer of the two pilot RS channels in each resource block, if the absolute value of the difference between the demodulation SINRs of the first layer of the two pilot RS channels is less than or equal to a first predetermined threshold, the modified demodulation SINR is the average of the demodulation SINRs of the first layer of the two pilot RS channels, otherwise, the modified demodulation SINR is the smaller of the demodulation SINRs of the first layer of the two pilot RS channels, and the calculating formula is as follows:
SINR (2 i '), SINR (2 i' + 1) is the demodulated SINR of the first layer of two pilot RS channels, SINR TH1 Is the first preset threshold value, SINR RB (i') is the demodulated SINR after the correction.
5. An RI selection method in an LTETM3 mode, comprising:
obtaining a pre-coded data matrix according to the PMI information;
obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
and comparing the demodulation SINR of the first layer of the two pilot frequency RS channels in each resource block, wherein if the absolute value of the difference value of the demodulation SINR of the first layer of the two pilot frequency RS channels is less than or equal to a second preset threshold value, the reporting value of the RI is 2, otherwise, the reporting value of the RI is 1.
6. The method for selecting RI in LTE TM3 mode as claimed in claim 5, wherein in the step of obtaining the precoded data matrix according to the PMI information, when the number of transmit antennas is 2 and the number of RI is 2, the calculation formula is as follows:
wherein the content of the first and second substances,represents the pre-coded data matrix and the pre-coded data matrix,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i =2i ',2i ' +1, i ' represents a resource block number,and W (i) D (i) U is obtained according to the PMI information.
7. The method of claim 6, wherein in the step of obtaining the equivalent channel estimation of each pilot RS channel of each resource block in the downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix, the calculation formula is as follows:
H eff (2i')、H eff (2 i ' + 1) represents the equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), respectively, and H (2 i '), H (2 i ' + 1) represent the original channel estimation matrices for the two pilot RS channels in each resource block, respectively.
8. A CQI selection system in LTETM3 mode, comprising:
the first matrix module is used for obtaining a pre-coded data matrix according to the PMI information;
a second matrix module, configured to obtain an equivalent channel estimation of each pilot RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot RS channel in each resource block and the precoded data matrix;
the first demodulation SINR acquisition module is used for calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
a second demodulation SINR obtaining module, configured to compare the demodulation SINR of the first layer of the two pilot RS channels in each resource block, where if an absolute value of a difference between the demodulation SINRs of the first layers of the two pilot RS channels is less than or equal to a first preset threshold, the corrected demodulation SINR is an average value of the demodulation SINRs of the first layers of the two pilot RS channels, and otherwise, the corrected demodulation SINR is the smaller of the demodulation SINRs of the first layers of the two pilot RS channels;
and the CQI selection module is used for obtaining the CQI in the LTE TM3 mode according to the corrected demodulation SINR.
9. The CQI selection system in LTE TM3 mode, as claimed in claim 8, wherein when the number of transmit antennas is 2 and the number of ris is 2, the first matrix module employs the following calculation formula:
wherein the content of the first and second substances,representing the pre-coded data matrix of the data,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i =2i ',2i ' +1, i ' represents a resource block number,and W (i) D (i) U is obtained according to the PMI information.
10. The CQI selection system in LTE TM3 mode according to claim 9, wherein the second matrix module employs the following calculation formula:
H eff (2i')、H eff (2 i ' + 1) respectively represents equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), and H (2 i '), H (2 i ' + 1) respectively represent the original channel estimation matrices for the two pilot RS channels in each resource block.
11. The CQI selection system in LTETM3 mode according to claim 10, wherein the first demodulation SINR obtaining module uses the following calculation formula:
SINR (2 i '), SINR (2 i' + 1) is two pilot RS signalsDemodulation SINR, SINR of the first layer of tracks TH1 Is the first preset threshold value, SINR RB (i') is the demodulated SINR after the correction.
12. An RI selection system in an LTETM3 mode, comprising:
the first matrix module is used for obtaining a precoded data matrix according to the PMI information;
the second matrix module is used for obtaining the equivalent channel estimation of each pilot frequency RS channel of each resource block in a downlink according to the original channel estimation matrix of each pilot frequency RS channel in each resource block and the pre-coded data matrix;
the first demodulation SINR acquisition module is used for calculating the demodulation SINR of the first layer of each pilot frequency RS channel according to the equivalent channel estimation of each pilot frequency RS channel;
and the RI selection module is used for comparing the demodulation SINRs of the first layers of the two pilot RS channels in each resource block, if the absolute value of the difference value of the demodulation SINRs of the first layers of the two pilot RS channels is less than or equal to a second preset threshold value, the reporting value of the RI is 2, otherwise, the reporting value of the RI is 1.
13. The RI selection system of claim 12, wherein when the number of transmit antennas is 2 and the number of RI is 2, the first matrix module uses the following calculation formula:
wherein, the first and the second end of the pipe are connected with each other,representing the pre-coded data matrix of the data,represents a data matrix after layer mapping, W (i) is a 2 × 2 codebook matrix, D (i) is a 2 × 2 delay matrix, i =2i ',2i ' +1, i ' denote the resource block number,and W (i) D (i) U is obtained according to the PMI information.
14. The system for RI selection in LTE TM3 mode of claim 13 wherein the second matrix module uses the following equation:
H eff (2i')、H eff (2 i ' + 1) represents the equivalent channel estimates for the two pilot RS channels in each Resource Block (RB), respectively, and H (2 i '), H (2 i ' + 1) represent the original channel estimation matrices for the two pilot RS channels in each resource block, respectively.
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CN101442388A (en) * 2008-12-29 2009-05-27 北京邮电大学 Precoding method and apparatus for multi-input multi-output system
CN101630966A (en) * 2009-08-20 2010-01-20 中兴通讯股份有限公司 Feedback method of channel quality in multi-input and multi-output system

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