FM-DCSK调制在AWGN和多径信道下性能的仿真

The Simulation for FM-DCSK Modulation in AWGN Channel and in Multi-path Channel

FM- DCSK调制的抗噪声性能在混沌键控数字调制方案中是最优的 ,尽管在可加白高斯噪声信道下它的抗噪声性能不是最好的 ,但混沌信号天生的宽带特性使得它在多径传播条件下优于传统的窄带调制方案。在双射线多径信道下进行仿真的结果表明 ,在传统的窄带调制方案无能为力的情况下 ,FM- DCSK系统仅仅在它的噪声性能方面下降了 5 d B.

This paper shows that the performance of FM DCSK is the best one in chaotic digital modulation schemes.In AWGN channel the performance of FM DCSK is inferior to the conventional narrow band modulation schemes,but in multi path channel it is superior to the latter because the chaotic signal is a wide band signal.The simulation results for two propagation paths present that the performance loss is less than 5 dB for FM DCSK modulation when conventional narrow band systems fail catastrophically under these conditions.