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Method for pre-encoding multi-input multi-output transmission and codebook encoding

A multiple-input, multiple-output technology, applied in the field of precoding MIMO transmission and codebook coding, can solve the problems of high overhead and difficult implementation of precoding matrix

Inactive Publication Date: 2008-12-24
ZTE CORP
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Problems solved by technology

However, in the actual system, it is difficult to implement because the overhead of feeding back the entire precoding matrix is ​​too large.

Method used

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  • Method for pre-encoding multi-input multi-output transmission and codebook encoding
  • Method for pre-encoding multi-input multi-output transmission and codebook encoding
  • Method for pre-encoding multi-input multi-output transmission and codebook encoding

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Embodiment Construction

[0066] In an actual system, it is difficult to feed back the entire precoding matrix, so in order to reduce the feedback overhead, a codebook-based precoding method is adopted. First encode and make a set of precoding matrices (codebook), which are stored in the transmitting end and receiving end respectively, and the receiving end selects from The best precoding matrix (vector) is selected in the codebook, and its index is fed back to the transmitter, which can greatly reduce the feedback overhead.

[0067] In MIMO transmission, when there are N transmitting antennas at the transmitting end, the rank (rank) during system transmission can vary from 1 to N according to actual channel conditions. When the rank is R, the corresponding codebook should consist of several matrices of NxR dimensions.

[0068] In the single-user MIMO (SU-MIMO) transmission researched by 3GPP Long Term Evolution (LTE), the matrix composition in the codebook is required to satisfy the characteristics o...

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Abstract

The invention discloses a method for multi-input multi-output transmission for precoding. The method comprises the following steps: a fundamental matrix is selected, a column vector is selected from the fundamental matrix according to the dimension of a precoding matrix under each rank, the precoding matrixes are combined into codebooks, and the codebooks are respectively stored into the transmitting end and the receiving end of a multi-input multi-output transmission system; the receiving end selects precoding matrixes from the codebooks, and feeds back the indexes thereof to the transmitting end; the transmitting end uses the precoding matrixes corresponding to the indexes when the next transmission is performed, performs linear transformation in spatial domain to signals to be transmitted and then transmits the signals. The invention also discloses a method for multi-input multi-output codebook coding for precoding. The method enables the system to meet the feedback expenses and obtains good performance gain.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for precoded MIMO (Multiple Input Multiple Output) transmission and codebook coding. Background technique [0002] In the MIMO system, the use of linear precoding technology can make full use of the advantages of multi-antenna arrays, thereby overcoming frequency selective fading and improving the performance of the entire system. When the transmitting end grasps the channel condition, the precoding technology can equivalently change the channel transfer matrix as required. [0003] In the frequency division duplex (FDD) mode, the receiving end feeds back the current channel state information or its function (usually partially) to the transmitting end, and the transmitting end uses the corresponding precoding matrix (vector) in the signal transmission for the next transmission. Before it is linearly transformed in the space domain, it achieves the equivalent effect...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L25/49H04L1/06
Inventor 于辉郁光辉龙航赵慧张峻峰
Owner ZTE CORP
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