一种高效直扩通信体制及其抗噪性能的研究

DS/SS Communication System with High Efficiency and Its Performance of Interference Rejection

基于一种并行组合直扩通信系统研究其抗噪性能，在考虑非线性处理（软限幅）和“ε－混合”噪声模型的前提下分析了单个直扩数字相关器的渐近相对效率（ＡＲＲ）．并由计算机模拟验证了这种理论分析的准确性。给出了该系统比特误码率（ＢＥＲ）的数值分析结果，表明软限幅对该系统的性能有较大影响，合理利用这种非线性处理可使系统性能得到改善。研究结果还表明，在一定条件下该系统与常规直扩通信系统相比具有相近的ＢＥＲ性能。

In this peper, the performance of interference rejection is invotignted based on a parallel combinitory DS/SS communication system. In the case which nonlinear processing (soft limitation) and'εmixtured' noise model are considered,the asymptotic relative efficiency (ARE) of single spread spectrum digital correlator is analysed,and the accuracy of the theoretical analysis is tested and verified by computer simulation. Numerical analysis results of BER performance of the system are provided. It is shown that the soft limiation has a strong impact on the system performance,and by properly making use of the nonlinear processing the performance can be improved. And also,it can be concluded that the proposed system can get a BER performance near to that of an usual DS/SS system under some conditions.