Method and device for eliminating time-domain narrowband interference of direct sequence spread spectrum communication system

Abstract

The invention provides a method for eliminating time-domain narrowband interference of a direct sequence spread spectrum communication system, which comprises the following steps of: 1) dividing received spread spectrum signals into two paths of same signals, wherein one path of signals are delayed and then output to an interference estimating module, and the other path of signals are taken as reference signals; 2) estimating interference signals in the first path of the spread spectrum signals by a transverse filter with unequal interval taps through a time-domain arithmetic, and outputting the interference signals; and 3) subtracting the interference signals from the reference signals, and obtaining the spread spectrum signals of which the narrowband interference is eliminated. In addition, the invention also provides a device for eliminating the time-domain narrowband interference of the direct sequence spread spectrum communication system. The method and the device have the advantages of little computation workload, no need of complicated hardware structure and easy digitalization. The transverse filter with the unequal interval taps can adapt to estimating more types of narrowband interference, and solves the problems of complicated realization of variable tap intervals and poor system continuous work performance at the same time.

Description

technical field [0001] The technology for eliminating narrow-band interference in a wireless communication system of the present invention specifically relates to a method and device for eliminating time-domain narrow-band interference in a direct sequence spread spectrum communication system. Background technique [0002] The Direct Sequence Spread Spectrum Communication System (DSSS) uses the higher rate PN code to spread the narrower frequency band signal to a wider frequency band for transmission, and the receiving end restores the original signal through the correlation processing between the PN code and the received signal. When the interference is a narrowband signal, during the cross-correlation process between the received signal and the PN code, the interference signal will spread to the entire frequency band to reduce the influence of the interference, so the spread spectrum signal can weaken the narrowband interference to a certain extent. The anti-interference a...

AI Technical Summary

Problems solved by technology

Among them, the narrowband interference suppression scheme based on the LMS algorithm has a simple structure and is convenient for digital realization. The disadvantage is that there are many calculation points

The narrowband interference suppression scheme based on the RLS algorithm converges quickly, but the calculation is complicated

[0010] The commonly used transversal filters for narrowband interference suppression in the time domain are each adapted to the same module delay interval, which is usually set to the chip interval or half a chip interval of the spreading code, which can overcome most narrowband interference. People have further proposed a variable tap interval implementation scheme, but the variable tap interval control on the one hand increases the complexity of the implementation, and at the same time affects the continuous working performance of the system

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