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Method for preprocessing information in multi-input multi-output system

A multi-output, multi-input technology, applied in baseband system components, through diversity reception to prevent/detect errors, etc., can solve problems such as unsatisfactory decoding performance, ineffectiveness, etc., to overcome inability to play a role, improve performance, effect of low symbol error rate

Inactive Publication Date: 2012-09-19
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Since these four methods are not directly optimized for the decoding characteristics of the system, their decoding performance is not very ideal
In addition, the first three methods do not work when the preprocessing matrix is ​​a unitary matrix, so there are certain limitations when using it

Method used

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  • Method for preprocessing information in multi-input multi-output system
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  • Method for preprocessing information in multi-input multi-output system

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Embodiment

[0029] In this embodiment, there are 4 transmit antennas (N T =4), 4 receiving antennas (N R =4), the modulation mode of the sending end is quadrature quadrature amplitude modulation, and the receiving end is a minimum mean square error equalizer, and the specific preprocessing steps are as follows:

[0030] Step 1, the receiving end obtains channel information at each subcarrier at the current moment according to an existing channel estimation method, and each channel information is a 4×4 complex matrix.

[0031] The channel estimation method is that the sending end sends pilot data at a specific time-frequency point, and the receiving end first obtains the channel information at the pilot point according to the received signal, and then estimates the channel information of all other subcarriers according to the channel estimation criterion. channel information.

[0032] Step 2, according to the size of the rank l of the channel information matrix H, determine the layer num...

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Abstract

The invention relates to a method for preprocessing information in a multi-input multi-output system, which belongs to the technical field of mobile communication. The method comprises the following steps of: obtaining channel information at each subcarrier at the current time; identifying the number of layers of sending data; selecting a codebook for a preprocessing matrix, to obtain an equivalent channel matrix consisting of a channel information matrix and the preprocessing matrix; obtaining the sum of equivalent signal-to-noise radio and symbol error rates on each layer of data, and usingthe sum of the symbol error rates as the weight of the selected preprocessing matrix; obtaining the weight of other preprocessing matrixes in the selected codebook respectively; and selecting the preprocessing matrix with the minimum weight, and feeding the index of the matrix with the minimum weight in the codebook back to a sending end which uses the selected preprocessing matrix to preprocess the sending data in the next sending process so as to complete the sending process. The invention has a low system symbol error rate, is applicable to any conditions, and overcomes the disadvantage that the prior art can not work when the preprocessing matrix is a unitary matrix.

Description

technical field [0001] The invention relates to a method in the technical field of mobile communication, in particular to a method for preprocessing information in a multiple-input multiple-output system. Background technique [0002] The MIMO (Multi-Input Multi-Output, Multiple Input Multiple Output) technology is widely used in the new generation of mobile communication systems. The preprocessing technology is a necessary link to realize closed-loop MIMO and improve system performance. Suppose there are N in the MIMO system T root transmit antenna and N R There are two receiving antennas, and the transmitting end transmits K streams of data each time (K≤N T ), then the transmitted data x needs to be multiplied with a preprocessing matrix W to map to N T on the root transmitting antenna, and then transmit out. The preprocessing matrix W needs to be designed according to the channel information of the system to improve the system performance. [0003] In a frequency di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04L25/02
Inventor 刘明润伊海珂俞晖陶梅霞徐友云
Owner SHANGHAI JIAO TONG UNIV
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