A narrowband interference detection and suppression method, device and receiver in a communication system

Abstract

The invention provides a method for detecting and suppressing interference in a wideband spread spectrum communication system, comprising: step 1, performing packet buffer processing on the received signal to obtain a received signal vector; step 2, detecting whether there is narrowband interference in the received signal vector, and if so, switching to Go to step 3; if it does not exist, go to step 5; step 3, calculate the autocorrelation P matrix; step 4, use the autocorrelation P matrix to perform linear transformation on the received signal vector, and obtain the received signal vector after narrowband interference suppression; step 5, Perform power normalization processing on the received signal vector after narrowband interference suppression to obtain a power-adjusted received signal vector; step 6, restore the power-adjusted received vector signal to a normal received chip signal. The invention also provides a narrowband interference detection and suppression device and receiver. The narrowband interference detection and suppression method, device and receiver provided by the invention can effectively detect and suppress various narrowband interferences, and have low complexity and strong robustness.

Description

technical field [0001] The invention belongs to the field of wideband spread spectrum communication systems, in particular to a narrowband interference detection and suppression method, device and receiver in a 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 in...

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] After research, it is found that in the case of interference in the wideband spread spectrum communication system, the use of the narrowband interference suppression module can significantly improve the system performance. However, when there is no narrowband interference, the interference suppression module will have the following two problems: (1) Increase the complexity of the system; (2) It does not help the improvement of system performance

The above problems limit the practical application of narrowband interference suppression technology, so it is necessary to study a narrowband interference detection and suppression scheme to solve the practical application problems of interference suppression technology

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