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Multiple-input and multiple-output precoding method and device

A precoding, multi-output technology, applied in diversity/multi-antenna system, space transmit diversity, baseband system components and other directions, can solve the problem of inability to achieve signal transmission quality and improve

Inactive Publication Date: 2009-10-07
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the elements in the matrix R are determined by the channel state information matrix H, usually the channel state information matrix H cannot be changed artificially, then the power normalization factor β is called a Relatively fixed magnitude, so the improvement of signal transmission quality cannot be achieved in the existing THP precoding scheme

Method used

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  • Multiple-input and multiple-output precoding method and device

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Embodiment 1

[0095] This embodiment is directed to a single-user MIMO system, that is, the receiving end is only one user, and the receiving end may have at least one receiving antenna.

[0096] Figure 4 It is a schematic diagram of signal transmission in a single-user MIMO system adopting the THP precoding method of this embodiment. see Figure 4 , in this embodiment, before signal transmission, each codeword in the preset codebook is multiplied by the channel state information matrix to obtain an equivalent channel matrix, and the triangular matrix corresponding to each codeword is obtained after performing QR decomposition . According to the principle of maximizing the minimum value of the absolute value of the diagonal elements of the triangular matrix, select the precoding matrix for this precoding, and determine the feedback matrix (B-I), where B=GR, G = diag ( R 11 - ...

Embodiment 2

[0124] This embodiment is directed to a multi-user MIMO system, that is, there are at least two users at the receiving end, and each user may have at least one receiving antenna.

[0125] Figure 7 It is a schematic diagram of signal transmission in a multi-user MIMO system adopting the THP precoding method of this embodiment. see Figure 7 , in this embodiment, before signal transmission, each codeword in the preset codebook is multiplied by the channel state information matrix to obtain an equivalent channel matrix, and the triangular matrix corresponding to each codeword is obtained after performing LQ decomposition . According to the minimum value maximization principle of the absolute value of the diagonal elements of the triangular matrix, the current precoding matrix is ​​selected, and the feedback matrix (B-I) is determined. The above operations are the same as the corresponding operations in Embodiment 1. In the process of signal transmission, the modulated signal...

Embodiment 3

[0155] This embodiment is aimed at a single-user MIMO system. Generally, the number of code streams in signal transmission is equal to the number of transmitting antennas. Considering that each code stream cannot have a higher signal-to-noise ratio when there are many code streams, in this embodiment, the number of code streams of the signal to be transmitted is reduced at the transmitting end, and before the precoding operation is performed using the precoding matrix, the code stream is executed. Stream transformation operations. For a single-user MIMO system, after the number of code streams is reduced, the signal-to-noise ratio of each stream can be effectively increased, and the bit error rate can be greatly reduced, so the signal transmission quality can be effectively improved. improve.

[0156] In this embodiment, the number of code streams n is preset, and nH = I or U H U=I, where U H Represents taking the conjugate transpose matrix of matrix U.

[0157] Figure ...

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Abstract

The invention discloses a multiple-input and multiple-output precoding method and device. In the method, an equivalent channel matrix is obtained by each precoding matrix and each channel state information matrix in a predetermined codebook; after the equivalent channel matrix is analyzed, a triangular matrix corresponding to each precoding matrix is obtained; a precoding matrix with a maximal minimum value of diagonal element absolute values is selected, and a pre-transmitting signal with eliminated inter-stream interference is precoded by using the precoding matrix. The precoding device comprises a codebook selecting module and a precoding module. The invention can effectively improve the signal transmission quality in a single-user and multi-user MIMO system.

Description

technical field [0001] The present invention relates to a signal transmission technology in the field of wireless communication, in particular to Tomlinson-Harashima Precoding (THP) in a multiple input and multiple output (Multiple Input and Multiple Output, MIMO) system Method and precoding device. Background technique [0002] Precoding technology is a key technology to improve the performance of MIMO system. This technology can realize the interference elimination in the signal transmission process in MIMO system and obtain better signal transmission quality. Wherein, the THP technology is a nonlinear precoding technology performed by the transmitter. In the MIMO system using THP technology, the transmitter determines the feedback matrix according to the result of LQ decomposition of the channel state information matrix H, and uses the feedback matrix to process the signal to be transmitted and send it to Receiving end. [0003] figure 1 A flow chart of an existing mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L25/03
Inventor 严春林王玮张战加山英俊
Owner NTT DOCOMO INC
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