Coding method for improving transmit diversity in multi-antenna system
A multi-antenna system and transmit diversity technology, which is applied in diversity/multi-antenna system, space transmit diversity, prevention/detection of errors through diversity reception, etc., can solve the problem of poor performance, limited application environment of space-time block codes, reduction, etc. question
Inactive Publication Date: 2013-03-20
SAMSUNG ELECTRONICS CO LTD +1
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[0002] Among the existing transmit diversity schemes for multi-antenna systems, there are mainly space-time coding schemes and cyclic delay diversity CDD (cyclic delay diversity). In the traditional space-time block coding schemes, the alamouti scheme of 2 transmissions and 1 reception is the coding rate R=1 The full diversity scheme has the best performance, but when the number of transmitting antennas is greater than 2, the orthogonal space-time block code coding rate R<1 is satisfied, and the reliability is sacrificed for the transmission rate
The cyclic delay diversity scheme is especially suitable for frequency selective channels and multi-carrier systems, and its performance is not as good as space-time block codes, but in any case the coding rate R=1
[0003] Space-time block codes that satisfy orthogonality, when the number of transmitting antennas is greater than 2, the coding rate is reduced to below R=1, and it is not full diversity, which seriously affects the throughput of the system. At present, it is urgent to improve the application of space-time block codes environmental constraints
Although the CDD transmit diversity scheme can guarantee R=1 in any case, this diversity expands the frequency selective fading, and its performance is not as good as the space-time block code
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[0017] The traditional Alamounti space-time coding adopts the method of 2 sending and 1 receiving. The specific mapping method is:
[0018] x 1 x 2 → x 1 x 2 - x 1 * x 2 * - - - ( 7 )
[0019] This coding scheme is different from Alamounti coding. At time t, the transmitted symbol on each transmit antenna group is x 1 , -X 1 * , At time t+T, the transmitted symbol on each transmit antenna group is: x 2 , X 2 * . Two symbols are sent in two symbol periods, and the coding rate is R=1
[0020] When the number of transmitting antennas is 4, the specific mapping of the orthogonal space-time code becomes:
[0021] [ x 1 , x 2 , x 3 , x 4 ] → x 1 - x 2 - x 3 - x 4 x 1 * - x 2 * - x 3 * - x 4 * x 2 x 1 x 4 - x 3 x 2 * x 1 ...
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The invention relates to a coding method for improving the transmit diversity in a multi-antenna system. The coding method comprises the following steps: transmitter units are divided back and forth by a plurality of antennae as adjacent units; a space-time group code is adopted among the transmitter units; and each transmitter unit internally adopts cyclic delay diversity (CDD). The invention effectively solves the problem of code rate reduction under the condition that the transmit antenna number of the orthogonal space-time group code is larger than 2, also utilizes the CDD theory and is particularly suitable for frequency selectivity channels. In addition, the scheme has a receiver scarcely increasing the complexity, thereby being a very transmit diversity scheme with compromise performance and complexity.
Description
Technical field [0001] The invention relates to a multi-antenna MIMO system, in particular to an encoding method for improving transmit diversity in a multi-antenna system. Background technique [0002] In the existing transmit diversity schemes of multi-antenna systems, there are mainly space-time coding schemes and cyclic delay diversity (CDD). In the traditional space-time block coding scheme, the alamouti scheme with 2 transmissions and 1 reception has a coding rate of R=1. The full diversity scheme of, the performance is the best, but it is extended to meet the orthogonal space-time block code rate R<1 when the number of transmitting antennas is greater than 2, and the transmission rate is sacrificed for reliability. The cyclic delay diversity scheme is particularly suitable for frequency-selective channels and multi-carrier systems. Its performance is not as good as space-time block codes, but the coding rate R=1 in any case. [0003] A space-time block code that satisfie...
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IPC IPC(8): H04L1/06H04B7/06
Inventor 周寒冰
Owner SAMSUNG ELECTRONICS CO LTD