An improved lms-rake receiving method and system for accelerating convergence in a leo satellite mobile communication system

Abstract

The invention discloses an improved LMS-Rake receiving method and system for accelerating convergence in a LEO satellite mobile communication system. The method includes: S1: at the nth moment, obtain the input signal u(n), weight matrix w(n); S2: complete the LMS operation; S3: the data register stores the corresponding parameters of each module of the LMS-Rake receiver in real time ; S4: The parameters of the data memory are operated by the LMS to provide data for the Aitken accelerated convergence algorithm; S5: Realize the optimization of the weight obtained in the step S4. The invention considers that the Rake receiver based on the self-adaptive algorithm LMS has the disadvantage of slow convergence speed, and introduces the Aitken accelerated convergence algorithm to improve the traditional LMS-Rake receiver. Compared with the traditional LMS-Rake receiver, although the present invention increases the amount of calculation for each iteration, overall, the number of convergences of the present invention is greatly reduced, the convergence speed can be significantly improved, and the total amount of calculation is also reduced to a certain extent reduce. At the same time, the algorithm itself introduces relatively few parameters and calculations, and is easy to implement in hardware.

Description

technical field The invention relates to the technical field of satellite mobile communication, in particular to an improved LMS-Rake receiving method and system for accelerating convergence in a LEO satellite mobile communication system. Background technique Satellite mobile communication has become an indispensable means of communication in modern communication due to its advantages such as wide coverage area, long communication distance, large transmission capacity, strong invulnerability, flexible networking, and cost independent of communication distance. It has been widely used in the fields of radio and television, broadband multimedia communication, personal mobile communication, emergency communication and military communication. In the satellite communication system, according to the orbit of the communication satellite and the motion state relative to the earth, it can be divided into a geostationary orbit satellite communication system and a non-geostationary orb...

AI Technical Summary

Problems solved by technology

Diversity combining in the Rake receiver includes two problems: (1) multipath separation problem: how to separate the received multipath signals so that they are not correlated with each other; (2) multipath combining problem: how to separate the multipath signals How to combine the signals to obtain the maximum signal-to-noise ratio benefit

The advantage of the LMS algorithm is that the algorithm has low complexity, high stability, and the algorithm is easy to implement, but the convergence speed of the algorithm is slow, which makes the total calculation amount of the algorithm large, and it takes a long time to realize the algorithm.

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