摘要
为提高现有直接序列扩频通信的接收信号的解调增益,提出分层级联随机共振接收算法。通过在接收信号的载波下变频和基带信号解扩过程中分别设计级联双稳态随机共振系统,一方面实现了正弦载波信号的宽带化解调接收,另一方面实现了信道噪声的能量向信号能量的逐步转化。理论分析和仿真实验结果表明,所提算法可以通过改变采样频率扩大接收机的频谱适用范围,同时通过增加两层级联随机共振系统的级联数量提高接收机性能。
To improve the demodulation performance of received direct sequence spread spectrum signal, a layered and cascaded stochastic resonance algorithm was presented. Two cascaded bistable stochastic resonance systems were designed respectively in the down-conversion process for carrier removing and the dispreading of baseband signal. By both of the systems, the broadband receiving of narrowband signal and the transformation from the energy channel noise to the signal energy were implemented. The theoretical analysis and simulation results show that the proposed algorithm can enlarge the application scope of frequency spectrum of the receiver, and improve the performance of receiver by increasing the number of the cascades of two-layer cascaded stochastic resonance system.
出处
《计算机应用》
CSCD
北大核心
2015年第4期934-937,959,共5页
journal of Computer Applications
基金
国家自然科学基金资助项目(60472064
61201380)
忻州师范学院教改项目(JG201206
JG201311)
关键词
无线通信
随机共振
级联
直接序列扩频
wireless communication
stochastic resonance
cascade
direct sequence spread spectrum
