Self-adaptive mixture automatic request retransmission method

A hybrid automatic and adaptive technology, applied in diversity/multi-antenna systems, error prevention/detection through diversity reception, multi-frequency code systems, etc., can solve problems such as loss of system transmission efficiency, reduce the number of retransmissions, improve performance, the effect of improving channel utilization

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

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Problems solved by technology

At present, space-time code technology has been applied to adaptive transmission, but it is mainly based on the coding method of the complete space-time code array, which will inevitably lose the transmission efficiency of the system

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

[0025] The example adopted by the present invention is: a MIMO system with 4 transmitting antennas and 4 receiving antennas, the space-time code adopts the commonly used ABBA type quasi-orthogonal code structure, the low-order modulation adopts BPSK, 4QAM modulation mode, and the high-order modulation The modulation method of 16QAM is adopted. Channel fading is a slow fading channel. The ABBA type code structure is:

[0026] x 1 - x 2 * x 3 - x 4 * x 2 ...

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Abstract

The invention relates to an adaptive automatic repeat request method, belonging to the wireless communication technology, which aims to combine channel coding with space-time coding, adjust the transmission modes adaptively, reduce repeat times effectively and improve the spectrum efficiency of the system. The invention is characterized in that a sending end is connected with a receiving end via a transmission link; the sending end has a plurality of transmission modes; a corresponding table of the transmission modes is formed; each transmission mode has a certain range of transmission times; a mode transmission graph of the transmission modes is formed. The invention has the advantages of adjusting channel coding mode, modulation mode and space-time coding mode via adjusting the transmission modes adaptively, reducing repeat times effectively, improving the channel utilization and the spectrum efficiency, reducing the implementation complexity and improving the performance of the system via ACK or NACK feedback choosing transmission modes flexibly when the slow channel is fading.

Description

technical field [0001] The invention belongs to wireless communication technology, in particular to an adaptive hybrid automatic request retransmission method combined with space-time code modulation in a multi-antenna system. Background technique [0002] In order to improve the transmission rate and transmission performance of the system in time-varying wireless channels, many proposals including 3GPP and 3GPP2 technical proposals have adopted adaptive modulation, channel coding and hybrid Automatic Repeat Request (ARQ) technology. Adaptive modulation is to adaptively change the modulation method according to channel conditions. For example, binary phase shift keying (BPSK) is used when the signal-to-noise ratio is low, and quaternary phase-shift keying (QPSK) or multiple Binary Quadrature Amplitude Modulation (MQAM), such as 4QAM, 16QAM, 64QAM, etc. After adding channel coding, such as Turbo code, although the data transmission rate is reduced, it can greatly improve the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/02H04L27/26H04B7/02
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
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