Blind adaptive multi-user detection method based on generalized maximum correlation entropy criterion

Abstract

The invention discloses a blind adaptive multi-user detection method based on a generalized maximum correlation entropy criterion. The method comprises the following steps: S100, modeling a satelliteCDMA (Code Division Multiple Access) communication system, and connecting a plurality of ground users with satellites covering the areas of the ground users through an uplink of satellite communication; expressing a discrete-time dynamic state space multi-user detector as a combination of a process equation and an observation equation; S200, using the generalized maximum correlation entropy of thedifference between the observed value and the estimated value as a loss function; S300, according to a loss function of a generalized maximum correlation entropy criterion and partial derivatives relative to detector parameters, enabling the loss function to be equal to zero, and deriving an expression of the blind self-adaptive multi-user detector; and S400, solving an expression of the blind self-adaptive multi-user detector by using an immobile point iteration method, and converging an expression algorithm, thereby obtaining a solution of the blind self-adaptive multi-user detector. Compared with traditional blind self-adaptive multi-user detection, the method has better convergence performance and can have a better bit error rate under impact noise.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a blind self-adaptive multi-user detection method based on the generalized maximum correlation entropy criterion. Background technique [0002] Satellite systems play an indispensable role in the global communication system, providing important services for maritime communications, communications in earthquake-stricken areas, etc. CDMA technology has been widely used in various satellite communication systems due to its advantages in flexibility, economy and anti-interference ability. In order to coordinate a large number of users in a satellite communication channel, the CDMA system uses different signal waveforms to distinguish different users. When these signal waveforms are not orthogonal, each user will suffer from multiple access interference, which requires multi-user detection methods. The multi-user detection method has been developed for many years, an...

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Problems solved by technology

[0004] For the impact noise problem in the satellite communication channel, the purpose of the present invention is to provide a kind of blind self-adaptive multi-user detection method based on generalized maximum correlation entropy criterion for the satellite CDMA communication system, has solved traditional blind self-adaptive multi-user detection for impact noise The sensitivity of the problem ensures the stability of the detector, and the fixed point iterative method is used to calculate the optimal detector derived from the new loss function, which ensures the convergence speed of the detector

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