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Method for designing code book precoded by multi-input and multi-output system

A multi-output, multi-input technology, applied in transmission systems, multi-frequency code systems, radio transmission systems, etc., can solve the problem of reducing the estimation accuracy of channel coefficients, and achieve the effect of uniform quantization error and obvious beneficial effects.

Active Publication Date: 2009-09-09
ZTE CORP
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Problems solved by technology

In this way, after estimating the MIMO channel coefficients, the receiver only needs to feed back the label of the corresponding codebook. This method reduces the signaling overhead, but correspondingly reduces the estimation accuracy of the channel coefficients.

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  • Method for designing code book precoded by multi-input and multi-output system
  • Method for designing code book precoded by multi-input and multi-output system
  • Method for designing code book precoded by multi-input and multi-output system

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Embodiment Construction

[0017] On the basis of the existing MIMO system precoding codebook design, the present invention comprehensively considers the problems of codebook feedback overhead and codebook accuracy, and proposes a codebook layered MIMO design scheme, that is, designing two or Codebooks at multiple levels, the final precoding weights are obtained through the combination of codebooks at two or more levels and functional operations. Specifically, taking the case of codebooks at two levels as an example, the codebook at the first level is a coarse quantization codebook, and the receiver notifies the sender through feedback. The second-level codebook is a fine-scale codebook, which is further quantization of the first-level quantized codebook interval. This part of the codebook does not need to be fed back, and is transparent to both the sender and receiver. Basically, the codebook of the first layer is processed by polling or symmetrical selection, and the data is weighted and transmitted w...

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Abstract

The invention relates to a method for designing a code book precoded by a multi-input and multi-output system. The method comprises the following steps: according to feedback overhead of the code book, setting uniform quantization reference; according to the uniform quantization reference, constructing a first layer of the code book; calculating quantization error phi of the first layer of the code book; and using the quantization error phi as input for further quantization so as to obtain a second layer of the code book. Through the treatment of the technical proposal, the method can homogenize the quantization error caused by the limitation of the feedback overhead, thereby obtaining diversity using gain of the code book. In addition, in the presence of redundant information of a channel coding module, the advantage of the method is more obvious under the condition of low coding speed.

Description

technical field [0001] The invention relates to a coding method for a MIMO (Multi-Input Multi-Output) system in the field of wireless communication, in particular to a codebook (codebook) design method for precoding (Precoding) in the MIMO system. Background technique [0002] In the case of limited channel bandwidth, the capacity of the system can be greatly improved by using MIMO technology. The precoding technology is that the sender uses the channel information fed back by the receiver to process the sent data with a precoding matrix, so that each data stream is equivalent to a mutually independent channel for transmission during the spatial channel transmission process. However, if the receiver cannot know the characteristics of the channel (for example, in FDD mode, or when channel reciprocity fails in TDD mode), the channel characteristics need to be obtained through feedback. If the real channel characteristics are fed back, the required system overhead is very larg...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04B7/04H04L27/26
CPCH04B7/0639
Inventor 孙云锋段亚军
Owner ZTE CORP
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