直扩系统复合干扰抑制不确定性解决方案

Solution of uncertainties in mixed interference suppression for DSSS

为了解决FICA用于抑制直扩系统复合干扰时出现的输出排列无序性、符号不确定性问题,引入带宽识别和帧头识别技术,提出基于FICA的直扩系统复合干扰抑制改进方案。该方案利用FICA的信号分选能力和带宽识别技术实现干扰的抑制,采用帧头识别技术确保解调输出数据符号的准确性。理论分析和实验结果表明,在Eb/No=4 dB时,该方案的复合干扰分离精度大于99%,带宽识别和帧头识别方法对直扩信号的识别率大于99.4%,能够准确分离干扰和信号并剔除干扰。

This paper proposed two algorithms： bandwidth and frame recognition,for solving the disorder arrangement and uncertain symbols caused by suppressing the multiple interferences using FICA in direct sequence spread spectrum（DSSS） systems.The bandwidth recognition realized interference suppression by using the signal sorting ability of FICA,and to ensure the accuracy of the demodulated data.The theoretical analysis and simulation results verify the effectiveness of the algorithms.When E_b/N_o=4dB,the rate of signal separation is above 99% and the rate of signal recognition is above 99.4%.