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Circulating space-time block code transmitting and diversity project in CDMA system

A technology of space-time block code and code division multiple access, which is applied in the direction of space transmit diversity, diversity/multi-antenna system, etc., and can solve the problem of low coding efficiency

Inactive Publication Date: 2008-05-21
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] Technical problem: The object of the present invention is to provide a cyclic space-time block code transmit diversity scheme in a code division multiple access system in a MIMO CDMA system, which is used to solve the traditional space-time block code transmit diversity when the number of transmission days is greater than 2. The disadvantage of low efficiency, and can effectively combat fast fading multipath channels

Method used

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  • Circulating space-time block code transmitting and diversity project in CDMA system
  • Circulating space-time block code transmitting and diversity project in CDMA system
  • Circulating space-time block code transmitting and diversity project in CDMA system

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Embodiment Construction

[0035] Cyclic Space-Time Block Coding (C-STBC) Coding and Decoding Method

[0036] For a MIMO CDMA system with M transmit antennas and N receive antennas, the input information symbols are grouped first, and each group contains M symbols (b M =[b 1 , b 2 ..b m ..b M ]), where bM Represents the information symbol vector, b m Indicates an information symbol. Cyclic encoding of these M symbols into an M×M dimensional code matrix B M , the specific encoding method is: B M The mth line of b M The sign obtained by cyclically shifting m-1 bits to the left. For the convenience of description, M=4 is taken as an example to illustrate the encoding and decoding method of the cyclic space-time block code. b 4 =[b 1 , b 2 , b 3 , b 4 ], cyclic encoding matrix B 4 for

[0037] B 4 = b 1 b ...

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Abstract

The emission diversity based on space-time code has space, time and code gains. Wherein, the space-time block code is simple; but, the code efficiency when emission antenna number is larger than 2 opposite to complex signal, and the scheme just fits to quasi-static fading channel. In CDMA system, the scheme uses cycle space-time block decoding method and orthogonal spread-spectrum code to different antennas, simplifies decode same as traditional code, and can improve anti-channel attenuation and system transmission performance.

Description

technical field [0001] The invention is a solution for space-time transmit diversity in MIMO CDMA (Multiple-Input Multiple-Output\Code Division Multiple Access) system. It is mainly used to solve the problem of low coding efficiency and countering fast fading multipath channels when traditional space-time block code transmit diversity method is adopted in MIMO CDMA system, and belongs to the technical field of space-time transmit diversity of MIMO CDMA system. Background technique [0002] There are many unfavorable factors in the wireless channel environment, such as multipath fading, Doppler frequency shift, and fast time-varying channels. How to overcome this unfavorable factor is always a problem that needs to be studied in mobile communication. At present, in order to ensure the reliable transmission of wireless channels, many technologies have been proposed. From the perspective of information theory, it has been proved that MIMO (Multiple Input Multiple Output) techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06
Inventor 傅洪亮鄷广增
Owner NANJING UNIV OF POSTS & TELECOMM
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