Space hour coding method based on odd-even checking code

Abstract

The invention discloses a space time encoding method based on the odd-even check code and mainly solves the problems of coded diversity gain and low diplex degrees of the space time encoding. The method carries out the deserialization to the information sequence, gets m concurrent sub information flows, divides the sub information flow into K sub groups, sends every sub groups into a even-odd check encoder respectively for encoding. The invention can provide high information speed. And compared with the hierarchical space time codes, in the condition of same speed, the invention can get largerdiversity gain and encoding gain.

Description

technical field [0001] The present invention relates to space-time coding technology, in particular to a parity-check code-based space-time code coding method, which is applicable to a multi-antenna system using any root transmitting antenna, and can be used to improve the performance of a serial cascaded system and information rate. Background technique [0002] As we all know, in the mobile communication system, because the channel transmission environment is very bad, the intersymbol interference caused by multipath transmission and the Doppler frequency shift caused by the user's movement are two very important factors affecting the quality of wireless communication. Therefore, Using diversity technology is one of the effective means to improve communication quality. Recently, with the development of mobile communication, while people are pursuing high-quality voice communication, they also hope that the future mobile communication system can provide high-speed data tra...

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Problems solved by technology

[0006] Trellis space-time code STTC was proposed by Tarokh et al. of Lucent Laboratory. The basic design idea is to use the traditional coding and modulation concept to combine coding and modulation to obtain coding gain under the premise of diversity gain. However, the existing There are several prominent problems in the trellis space-time coding form: (1) The trellis space-time code STTC can only increase the code rate by increasing the modulation order. The number of states of the encoder must be at least equal to the modulation order, so the increase of the code rate will inevitably increase the number of shift registers in the encoder, and the decoding complexity will increase exponentially; (2) the general grid space-time The encoding method of the STTC code is aimed at two transmitting antennas. Although there are grid space-time codes STTC for multiple transmitting antennas at present, because its basic design idea requires that the signal containing the same information bit (3) The optimization of grid space-time code STTC is another difficult problem. Although various grid space-time code STTC optimization methods have been proposed, But they are all proposed on the basis of search, and it is difficult to get an effective optimization method.

[0007] From the above analysis, it can be seen that the three space-time coding methods have their own advantages and disadvantages: although the orthogonal block space-time code OSTBC and the trellis space-time code STTC can achieve high diversity gain, the transmission rate is greatly limited, that is, multiplexing Although the layered space-time code LSTC has a high degree of multiplexing, the diversity gain is relatively low

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