Robust multiuser detector design method

Abstract

The invention relates to a robust multiuser detector design method, which solves the technical problem of high error rate of the traditional robust multiuser detector in an impact noise channel environment. The robust multiuser detector design method comprises the steps of: initializing algorithm parameters; using an opposition-based learning method to initialize a parent population, and determining three wolves in the parent population; updating the parent population by adopting an improved gray wolf algorithm position updating equation, and sorting population individuals according to fitnessvalues from large to small; generating offspring crossover mutants by utilizing the parent population, performing position information differential operation on an evolutionary direction of the offspring crossover mutants and successful crossover mutation probabilistic information when the fitness values of the offspring crossover mutants are superior to that of the parent population, acquiring new evolutionary direction information and saving the new evolutionary direction information, and updating positions of the three wolves. With the adoption of the robust multiuser detector design method adopting a Huber theory and utilizing a residual non-rapid-increasing function to design a multi-user detector in an impact noise channel, the mentioned problem is effectively solved, and the robustmultiuser detector design method can be used in multi-user detector design.

Description

Technical field

[0001] The invention relates to the field of multi-user detection in the field of spread spectrum communication signal processing, and in particular to a robust multi-user detector design method. Background technique

[0002] Code Division Multiple Access (CDMA) is a common communication standard in the field of spread spectrum communication and is widely used in many fields such as satellite navigation and mobile communication. However, the CDMA system has the problems of multiple access interference and near-far effects, both of which are the main factors affecting the communication capacity and performance of CDMA. The idea of ​​multi-user detection (MUD) is put forward, which effectively suppresses the adverse effects of the two on the system. The multi-user detection problem of the CDMA system can be regarded as a group optimization problem of NP combination. The purpose of multi-user detection is mainly to achieve the extraction of target user data informat...

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