A method to reduce the complexity of turbo-mpa receiver

Abstract

The invention discloses a method for reducing the complexity of a Turbo-MPA receiver, and belongs to the technical field of wireless communication. The method disclosed by the invention comprises thesteps of: obtaining the posterior log-likelihood ratio of received signals through an MPA receiver in a condition of prior equal-probability, namely in a condition that the prior log-likelihood ratiois zero, calculating extrinsic information of coding bits by utilizing the posterior log-likelihood ratio and a bayes formula, selecting a coding bit set having relatively low credibility from the extrinsic information, and outputting the corresponding log-likelihood ratio; determining a check bit set related to the coding bit set having low credibility through the check relationship; furthermore, updating the log-likelihood ratio of the coding bit set having low credibility by utilizing the check bit set, the check relationship and a sum product algorithm, so that the prior log-likelihood ratio is updated; and, replacing the zero prior log-likelihood ratio by the updated prior log-likelihood ratio, iterating to the maximum iteration time, and finally, outputting decoding bits. By means of the method for reducing the complexity of the Turbo-MPA receiver disclosed by the invention, the calculation complexity and the processing delay of the Turbo-MPA receiver in the iteration process can be reduced.

Description

technical field [0001] The invention relates to a method for reducing the complexity of a Turbo-MPA receiver, in particular to a method suitable for reducing the complexity of a multi-user receiver in a mobile communication system, and belongs to the technical field of wireless communication. Background technique [0002] With the explosive growth of the number of mobile communication devices, "low latency and massive connections" has become an important requirement for the next generation of wireless communication technology. Compared with the traditional orthogonal multiple access technology, the non-orthogonal multiple access (NOMA) technology can further improve the user capacity, among which the sparse code multiple access (SCMA) technology proposed by H Nikopour et al. The excellent performance in efficiency and throughput has become one of the strong competitors in the fifth generation mobile communication technology (5G). [0003] The main idea of ​​SCMA is to combi...

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Problems solved by technology

[0006] The technical problem to be solved by a method for reducing the complexity of the Turbo-MPA receiver disclosed by the present invention is: to reduce the computational complexity of the receiving end for multi-user access in the wireless communication system under the condition of ensuring the reliable reception of the Turbo-MPA receiver In order to reduce the processing delay, it can meet the requirements of low-latency and high-reliability scenarios for 5G wireless communication systems

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