Narrowband interference suppression method and device used in spread spectrum communication system and receiver

Abstract

The invention provides a narrowband interference suppression method used in a wideband spread spectrum communication system, comprising the following steps: firstly, carrying out grouping and caching process on the receiving signal and obtaining the receiving signal vector; secondly, calculating auto-correlation P matrix; thirdly, carrying out linear conversion on the receiving signal by the auto-correlation P matrix and obtaining the receiving signal vector after the narrowband interference suppression; fourthly, carrying out the power normalization treatment on the receiving signal after narrowband interference suppression and obtaining the receiving signal vector after power adjustment; and fifthly, recovering the receiving vector signal after power adjustment to the normal receiving code signal. The invention also provides a narrow interference suppression device and a receiver. By adopting the narrowband interference suppression method and device used in the wideband spread spectrum communication system and the receiver, the various narrowband interferences can be suppressed effectively, and simultaneously the complexity is low and the robustness is strong.

Description

technical field [0001] The invention belongs to the field of wideband spread spectrum communication systems, in particular to a narrowband interference suppression method, device and receiver in the wideband spread spectrum communication system. Background technique [0002] Broadband spread spectrum communication system is one of the most widely used digital communication systems at the present stage, and has many advantages such as strong anti-multipath ability, low transmission power, and low interception rate. Narrowband interference (such as monotone interference, narrowband digital interference, etc.) figure 1 Shown is a schematic diagram of spectrum overlap between wideband spread spectrum communication system and narrowband system. figure 1 It can be seen from the figure that the frequency spectrum of the wideband signal and the narrowband signal overlap, so the systems will generate spectrum interference with each other. [0003] Existing narrowband interference s...

AI Technical Summary

Problems solved by technology

The problem of transform domain technology is spectrum leakage and loss of useful signal

Fixed code-assisted technology requires prior information of the interfering signal, which is inconvenient to implement in practical systems

However, the performance of adaptive code-assisted technology is not ideal, and the amount of calculation is too large when dealing with the autocorrelation matrix whose dimension is the spreading factor

In addition, the code-assisted technology needs to be carried out when the received signal is synchronized. In the case of strong interference, the system often cannot be synchronized smoothly.

[0007] The wideband spread spectrum communication system has a certain ability to resist narrowband interference, and it increases with the increase of the spread spectrum gain, but the use of increasing the spread spectrum gain to resist narrowband interference will reduce the system capacity and increase the system complexity

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