Method and system for processing signals of multiple antennas in downlink system

A processing method and technology for receiving signal processing, applied in diversity/multi-antenna systems, space transmit diversity, preventing/detecting errors through diversity reception, etc., can solve the problem of insufficient support for 8 transmit antennas, improve signal transmission performance, and signal transmission performance improvement etc.

Inactive Publication Date: 2013-03-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, in the existing open-loop spatial multiplexing technology, 4 fixed orthogonal codewords are still used as the precoding for cyclic use, and the base station does not know any channel information of the UE at all. This completely open-loop transmission Although the mode does not require UE feedback information, it can improve the signal transmission performance of high-speed UEs. However, because the 8-antenna codebook has a dual-codebook structure, the existing open-loop spatial multiplexing technology cannot fully support 8 Transmitting antenna configuration and dual codebook structure, for example, the long-term channel information in the dual codebook cannot be used to improve signal transmission performance, and DMRS cannot be well used to enhance the performance of medium and high-speed UEs

Method used

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  • Method and system for processing signals of multiple antennas in downlink system
  • Method and system for processing signals of multiple antennas in downlink system
  • Method and system for processing signals of multiple antennas in downlink system

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Embodiment 1

[0169] The application scenario of this embodiment is: the time-frequency resource granularity of cyclic precoding is a subcarrier, the codebook is an LTE 10 8-antenna codebook, the DMRS precoding matrix is ​​an identity matrix, and the multi-antenna signal in the downlink system of this embodiment processing methods, such as image 3 As shown, the rank of the channel is 2, and the corresponding R10 codebook is shown in Table 1:

[0170] Table 1

[0171]

[0172]

[0173] in, Indicates the phase factor, v m =[1 e j2πm / 32 e j4πm / 32 e j6πm / 32 ] T Represents a DFT vector.

[0174] Correspondingly, in this embodiment, U = 1 2 1 1 1 e - j ...

Embodiment 2

[0177] The difference from Embodiment 1 is that the application scenario of this embodiment is that it is necessary to obtain beam coverage with greater angle expansion. At this time, the UE determines the long-term PMI component i in the long-term channel information of the downlink channel 1 The adjacent long-term PMI component i of 1 , and the determined long-term PMI component i in the long-term channel information of the downlink channel 1 The adjacent long-term PMI component i of 1 sent to the base station, specifically: for i in the codebook shown in Table 1 1 The components are combined to obtain a larger spread of the beam scanning angle. In this embodiment, for every 4 i 1 Merge, and get a merged sequence number i' 1 and report to the base station, then i′ 1 The corresponding bit number of is 2; then the reported index number i′ 1 i in the codebook 1 The corresponding relationship of index numbers is shown in Table 2:

[0178] Table 2

[0179]

i′...

Embodiment 3

[0183] The difference from Embodiment 1 is that the application scenario of this embodiment is: the time-frequency resource granularity of cyclic precoding is RB, the codebook is the 8-antenna codebook of LTE R10, and the precoding matrix of DMRS is the long-term PMI component i 1 and the short-term PMI component i 2 Indicated codeword; cyclic precoding codeword set selection: long-term PMI component i fed back by UE 1 and i 1 The corresponding short-term PMI component i 2 = 8, ..., codeword indicated by 15; the UE directly uses the equivalent channel information H measured on the channel sending the DMRS r W(i 1 , i 2 ) interpolation to obtain the equivalent channel information HW(i 1 , i 2 ).

[0184] Under this condition, there are two situations. The UE may know the cyclic precoding mode and the cyclic precoding codeword set of the base station, or may not know the cyclic precoding mode and the cyclic precoding codeword set of the base station. When the UE does not...

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Abstract

The invention provides a method and a system for processing signals of multiple antennas of a downlink system. The method includes that a base station determines a code word set for cyclic pre-coding according to long channel information of a downlink channel when transmission signals are processed; and the transmission data and demodulation reference signals (DMRS) are subjected to pre-coding according to a cyclic pre-coding mode and the determined code word set for cyclic pre-coding. The method and the system have the advantage that the signal transmission performance can be effectively improved for high-speed user equipment (UE).

Description

technical field [0001] The present invention relates to a multi-antenna signal processing technology, in particular to a multi-antenna signal processing method and system in a downlink system. Background technique [0002] In a long-term evolution (LTE, Long term evolution) system in which a base station is configured with multiple antennas, for low-speed user equipment (UE, User Equipment), it is usually selected in the codebook and fed back to the base station Precoding Index (PMI, Precoding Matrix Index), a channel quality index (CQI, Channel Quality Index), and a rank index (RI, Rank Indicator), the base station uses the precoding corresponding to the fed back PMI as the weight of the transmitting antenna. The premise of this approach is that the channel changes little during the time period when the UE feeds back the PMI and the base station uses the corresponding precoding for signal transmission, which is satisfactory for low-speed UEs. However, for a UE moving at hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L1/06
Inventor 郑勇孙云锋陈艺戬郭森宝
Owner ZTE CORP
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