Interference Avoidance Function Research of Spread Spectrum System Using Composite Sequence

Abstract

Facing with some problems of there being more narrow-band interference than Anti interference tolerance of Communication system in communication channel, such as the serious deterioration of the communication system and the decreased communication quality. We put forward that generating a new mW sequence by composite m sequence and Walsh sequence. When we use mW sequence to change the cycle of m sequence and the line order of Walsh sequence, the position of composite sequence’s power spectrum in frequency band can be changed too. Using this we can avoid narrow-band interference in communication channel, and improve the reliability and efficiency of communication systems. By the MATLAB simulation of using the mW composite sequence as spread spectrum code, using single frequency interference to simulate narrow-band interference, and contrast on its power spectrum and bit error rate, we can illustrate that mW composite sequence can significantly improve the function of communication system.