一种全数字解扩解调方法的性能仿真和技术实现研究

Performance Simulation and Technique Implementation Study of a Digital Despread and Demodulating Method

给出基于软件无线电的扩频通信接收系统实现方案.研究了采用全数字解扩解调方法及其在技术实现过程中对系统误比特率的影响,并与其他方法的扩频通信系统误比特率进行了MATLAB仿真分析比较.实验结果表明,所给方法在相同输入信噪比下,通过合理选取采样率、有效设计低通滤波器,系统误码性能最优.

An implementation scheme of Direct Sequence Spread Spectrum （DSSS） communication receivers system based on software radio is given. The influence of the digital despread and demodulating method and its implementation process on the hit error rate （BER） of DSSS receivers system is studied, and the MATLAB simulation comparison with BER of other DSSS communication systems is presented. The experiments show that the performance of this method is the best under the same signal noise ratio, provided the sample rate and effective low pass filter is chosen rationally.