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Method and device for transmitting data by space-time coding operation

A space-time encoding and data transmission technology, applied in the field of data transmission, can solve the problem of high bit error rate and achieve the effect of reducing the bit error rate

Inactive Publication Date: 2009-12-02
CHINA MOBILE COMM GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Embodiments of the present invention provide a method and device for transmitting data through space-time coding operations, so as to solve the problem caused by differences in instantaneous channel conditions when using a fixed space-time coding matrix to perform space-time coding operations on data in a MIMO system. In the case of a certain signal-to-noise ratio, the bit error rate of the system may be relatively large

Method used

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  • Method and device for transmitting data by space-time coding operation

Examples

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Effect test

example 1

[0071] In the first simulation example, it is set that the number of transmitting antennas Nt=4, the number of receiving antennas Nr=1, the code block symbol period T=4, and the space-time coding matrix is ​​a 4×4 matrix. The real part and the imaginary part of the modulated symbol are split to obtain: x 1 R 、x 1 I 、x 2 R 、x 2 I 、x 3 R 、x 3 I 、x 4 R 、x 4 I These 8 symbols.

[0072] Step 1: Determine 16 groups of orthogonal bases C 1 to C 16 As an extended matrix of 8 symbols obtained by modulation, the complex weighting of these 16 orthogonal bases can form any 4×4 matrix. These 16 groups of orthogonal basis C are as follows:

[0073] C 1 = 1 0 0 0 0 1 ...

example 2

[0106] In this example, the base matrix is ​​the same as that in Simulation Example 1, and three encoding matrices that can be used for single complex symbol decoding (SSD) can be obtained, one of which is:

[0107] S 1 = 2 2 x 1 R - x 1 I + j ( x 2 R - x 2 I ) x 3 ...

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Abstract

The invention discloses a method for transmitting data by space-time coding operation, including: calculating all signal power element values and all interference power element values of each equivalent channel correlation matrix according to the current channel condition; selecting an equivalent channel correlation matrix meeting set condition according to the signal power element value and the interference power element value; and carrying out space-time coding on the data to be sent by utilizing the space-time coding matrix corresponding to the selected equivalent channel correlation matrix and sending the data. By the invention, error rate of an MIMO transmission system is reduced while the signal to noise ratio is determined. The invention also discloses a device for transmitting data by the space-time coding operation.

Description

technical field [0001] The present invention relates to data transmission technology in the field of communication, and in particular to a method and device for transmitting data through space-time coding operations in a multiple input multiple output (Multi Input Multi Output, MIMO) system. Background technique [0002] MIMO technology is an important technology in modern communication technology. Through MIMO technology, multiple antennas can be installed at the transmitting end and receiving end of the communication system, and the capacity and reliability of the system can be improved by using independent multipath fading between antennas. [0003] The following two steps are performed when transmitting data at the sender end of a MIMO system: [0004] Step 1. Channel coding is performed on the source data by using traditional coding and modulation techniques, and modulation is performed on the data after channel coding. [0005] Step 2, performing space-time coding ope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 韩璐赵慧王力王文博
Owner CHINA MOBILE COMM GRP CO LTD
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