直扩系统对抗窄带干扰能力的影响因素分析

通过将得到的窄带干扰信号经过直接序列扩频接收系统的解扩解调模块后的形式,推导出了窄带干扰下直接序列扩频通信系统处理增益的表达式,从理论上分析系统对抗窄带干扰的特性,对影响其抗干扰能力的因素进行了多方面的分析。利用Matlab仿真得出其抗干扰能力不仅与扩频倍数有关,与窄带干扰的形式以及干扰相对载波的位置等因素相关的结论,为进一步研究和提高直接序列扩频系统对抗窄带干扰的能力打下基础。

Analysis of Influence Factors of Narrow-Band Interference on Direct Sequence Spread Spectrum Communication System

The expression for processing the gain by the direct sequence spread spectrum （DSSS） communication system is derived from the form that the gained narrow band signals pass through the dispreading and demodulation module of DSSS receiving system. The characteristic that the system withstands the narrow-band interference is analyzed theoretically. The factors that affect the antijamming capability of the system are also analyzed. The conclusions that the antijamming capability is not only related to the magnification of DSSS, but also to the form of narrow-band interference and the relative position of the carrier, are abtained.