Codebook generating method and device of pre-coding in multiple-input-multiple-output (MIMO) system

A technology of precoding and precoding matrix, which is applied in the field of precoding codebook generation, can solve problems such as MIMO codebook matrix MIMO channel incompatibility, and achieve the effects of improved performance, easy implementation, and good convergence

Inactive Publication Date: 2011-04-06
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: how to provide a MIMO codebook matrix that can solve the problem that the MIMO codebook matrix generated in the prior art does not correspond to the actual MIMO channel, and improve the performance of the receiver adopting vertically layered MIMO systems. Codebook generation scheme for precoding in the system

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  • Codebook generating method and device of pre-coding in multiple-input-multiple-output (MIMO) system
  • Codebook generating method and device of pre-coding in multiple-input-multiple-output (MIMO) system

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Embodiment Construction

[0053] In order to make the purpose, content, and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0054] The precoding codebook generation method in the MIMO system of the embodiment of the present invention is described as follows in conjunction with the accompanying drawings:

[0055] Such as figure 1 As shown, the method includes the following steps:

[0056]S101: Perform GMD decomposition on the MIMO channel matrix (or called channel transmission matrix, transmission channel matrix) to obtain a precoding matrix V to be quantized. The specific process is as follows:

[0057] According to the GMD decomposition formula H=UR'V H Decompose the MIMO channel matrix H. In the GMD decomposition formula, R' is an upper triangular matrix with equal diagonal elements, U is a left unitary matrix, V is a right unitary matrix, and the superscript ...

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Abstract

The invention discloses a codebook generating method of pre-coding in a multiple-input-multiple-output (MIMO) system, which comprises the following steps: carrying out geometric mean decomposition (GMD) on an MIMO channel matrix to acquire a pre-coding matrix V to be quantized; acquiring a probability distribution function p(V) of the pre-coding matrix V to be quantized by the transmission channel matrix of the MIMO; acquiring the mean quantization error of the system according to the pre-coding matrix V and the probability distribution function p(V) thereof; and acquiring a codebook matrix according to the mean quantization error of the system. The invention also provides a codebook generating device corresponding to the method, which comprises a computing module, an acquiring module and a codebook generating module. The codebook matrix generating method provided by the invention is matched with the channel matrix, thereby being suitable for various channel conditions; and for an MIMO pre-coding system of which the receiver adopts a vertical stratification method, the method of the invention can obtain better performance promotion.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for generating a precoded codebook in a MIMO system. Background technique [0002] The multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) technology is a major breakthrough in the field of wireless mobile communication technology. MIMO technology refers to the use of multiple antennas for data transmission and reception. Studies have shown that using MIMO technology can increase the capacity of wireless communication systems. Using precoding technology to multiplex between multiple data streams and antennas can make more effective use of existing channel resources. Therefore, precoding technology has also become a new research hotspot. In practical systems, due to factors such as channel delay, the transmitter cannot obtain ideal channel information. Therefore, codebook-based precoding technology has become the mainstream d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04L1/00H04L1/06
Inventor 李立华张平王化磊宋磊罗元
Owner BEIJING UNIV OF POSTS & TELECOMM
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