基于小波的变换域通信系统抗干扰性能研究

变换域通信系统通过信道估计在变换域设计信号波形避开干扰,它没有采用载波调制,而是用一个类似噪声的基函数进行信息调制。对高斯白噪声信道下的取不同门限值的基于小波的变换域通信系统与DSSS的抗干扰性能作了比较分析,仿真结果表明基于小波的变换域通信系统相比于DSSS在单音、多音、线性调频、10%部分带宽干扰下误码率平均改进约10dB,在70%部分带宽干扰下误码率平均改进约5dB,并对基于小波的变换域通信系统门限值的选取给出了建议。

Research on the Anti-jamming Performance of Transform Domain Communication System Based on Wavelet

The fundamental idea in transform domain communication system is to synthesize a smart adaptive waveform to avoid interference at the transmitter.Its communication waveform is designed in transform domain according to the estimation of electromagnetic environment and no carrier modulation is employed,but a noise-like basis function is used to modulate the data.Comparing the anti-jamming performance of TDCS based on wavelet transformation to DSSS with scenarios for AWGN channel.The simulation results demonstrate that the average TDCS bit error rates improvement relative to an equivalent DSSS system is 10 dB with single-tone,multiple-tone,line frequency modulation and 10% part-jamming.The improvement is 5dB with 70% part-jamming.We also simulate and analyze the problem of threshold selection.Some advices about threshold selection are given on basis of the simulation results.