Signal detection method and device applied to non-orthogonal multiple access system

Abstract

The embodiment of the invention provides a signal detection method and device applied to a non-orthogonal multiple access system. The method and device are applied to a multi-user detector. The method comprises the following steps: according to an evaluation probability predicted value on a log domain, currently saved by another user node connected with a resource block node to be updated currently, determining an evaluation probability predicted value on the log domain of the resource block node to be updated currently, transferred to the user node, and sending the value to the user node so as to be saved; according to the evaluation probability predicted value on the log domain, currently saved by the user node and a prior probability value on the log domain of the user node, determining an evaluation probability predicted value on the log domain, transferred to a next resource block node connected with the user node, of the user node; and sending the value to the next resource block node connected with the user node so as to be saved. By applying the embodiment of the invention, the convergence rate of an MPA algorithm can be effectively increased, and the processing delay of the multi-user detector can be reduced.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a signal detection method and device applied to a non-orthogonal multiple access system. Background technique [0002] Non-orthogonal multiple access technology can significantly improve the spectrum efficiency of wireless communication systems, and is one of the important supporting technologies for future mobile communication systems. [0003] In a non-orthogonal access system, the data of different users are directly mapped to different codewords in the multi-dimensional constellation codebook, and multiple users overlap on mutually orthogonal transmission resource blocks at the same time, thereby improving the system spectrum utilization . When detecting multi-users in a non-orthogonal access system, a message propagation algorithm (Message propagation algorithm, MPA) is used to decode the codewords of the multi-users, so as to detect the data signals sent by each use...

AI Technical Summary

Problems solved by technology

[0006] Since the above-mentioned update of the value probability prediction value of the user node and the resource block node in the logarithmic domain is based on the updated value probability prediction value of the user node and the resource block node in the logarithmic domain in the previous cycle. , but the value probability prediction value updated by the user node or resource block node in the logarithmic domain in the current period is different from the corresponding value in the previous period, and the corresponding value cannot be used until the next update period. In this way, As a result, the user bit likelihood ratio determined according to the value probability prediction value of each user node in the logarithmic domain is close to the convergence value. The period becomes longer, the convergence speed is slower, and the multi-user detector has a large processing delay.

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