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Self-adaptive mixture automatic request retransmission method

A hybrid automatic and serial number transmission technology, applied in diversity/multi-antenna systems, space transmit diversity, preventing/detecting errors through diversity reception, etc., can solve problems such as useless and full use of multi-antenna diversity gain, and reduce retransmission Number of times, the effect of optimizing system performance

Inactive Publication Date: 2008-05-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this retransmission combination mechanism is based on chase combination, that is, the same symbol is used for each retransmission, and it is useless to make full use of the diversity gain of multiple antennas.

Method used

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  • Self-adaptive mixture automatic request retransmission method
  • Self-adaptive mixture automatic request retransmission method
  • Self-adaptive mixture automatic request retransmission method

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Embodiment Construction

[0027] The example adopted in the present invention is: a MIMO system with 4 transmitting antennas and 4 receiving antennas, the channel coding adopts Turbo code, the modulation mode adopts 16QAM, and the space-time code adopts the commonly used ABBA type quasi-orthogonal code structure.

[0028] The code array structure of the quasi-orthogonal code of the ABBA type is as follows:

[0029] x 1 - x 2 * x 3 - x 4 * x 2 ...

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Abstract

The invention discloses a combined hybrid automatic repeat request (HARQ) method, belonging to the field of wireless communication technology, aiming to effectively reduce the signal error rate, reduce retransmission number and increase throughout rate. The utility model is characterized that: a data transmission link is established between the sending end and the receiving end, the channel coding and the space-time coding structure are cascade connected; wherein, the number of the transmitting antenna at the sending end M is larger than one, M constellations or M kinds of bit sequence are stored at the sending end and the receiving end; one constellation is mapped or a bit sequence is rearranged and then mapped on a fixed constellation before each retransmission; then space-time coding is done according to a space-time coding structure; finally soft information combination and iterative decoding is done at the receiving end. The utility model has an advantage that the antenna diversity gain and the bit-symbol mapping diversity gain can effectively reduce the retransmission number and optimize system performance.

Description

technical field [0001] The invention belongs to wireless communication technology, in particular to a combined hybrid automatic request retransmission method in a multi-antenna system. Background technique [0002] The wireless communication system expects to obtain higher data transmission rate and higher reliability. However, the multipath fading characteristics of the wireless channel limit the performance of the system. The space-time code is a multi-antenna technology that can effectively resist multi-path fading. It can be roughly divided into two categories: one is space-time codes based on space diversity, commonly used space-time trellis codes (STTC) and space-time block codes (STBC); the other is space-time codes based on space multiplexing , there is layered space-time code (BLAST). Channel coding (such as LDPC, TURBO code) can obtain good error performance through bit interleaving and iterative decoding. Even so, wireless communication systems still need an Aut...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04B7/06H04B7/08H04L1/06
Inventor 刘应状敖娟林宏志孙俊王德胜周宗仪朱光喜
Owner HUAZHONG UNIV OF SCI & TECH