基于级联随机共振的窄带信号宽带化接收

Broadband receiver of narrowband signal based on the cascaded stochastic resonance

为提高传统窄带接收机的解调增益,提出了基于级联随机共振的窄带信号宽带化接收方法。该方法一方面对接收信号进行随机共振运算,将信号中的噪声转化为信号能量;另一方面通过级联方式将接收信号转化为方波信号,并利用其先验信息构造本地序列进行宽带化相关运算,最终提高了信号处理增益。理论分析与仿真结果表明,该方法相比于传统的处理方式,其信噪比增益提高大于3 d B,并且对于接收信噪比为-7~1 d B的QPSK信号,其增益提高约为20 d B。

To improve the demodulation gain of traditional narrowband receiver, a narrowband signal receiving method of broadband based on cascaded stochastic resonance is proposed. On one hand, the noise in the signal is converted to the signal energy by the stochastic resonance operation on the received signal. On the other hand, by cascading stochastic resonance systems, the received signal is changed into square wave signal; and by constructing related sequences with prior information of received signal, the demodulation output has high gain. Theoretical analysis and simulation results show that compared with the traditional approach, this method improves detection performance in terms of SNR by more than 3 d B. And for receiving SNR of QPSK in-7~1 d B, the gain increased is about 20 d B.