基于非线性动力学系统噪声减缩盲解调负信噪比载频上的随机码流  

Blind Demodulating Random Code Stream on the Carrier Frequency with Negative SNR Based on Noise Reduction of Nonlinear Dynamics Systems

作　　者：王超[1] 黄伟[1] 黄显高[2] 

机构地区：[1]长安大学信息工程学院,西安710064 [2]广州华商职业学院机电系,广州511300

出　　处：《计算机系统应用》2016年第10期27-38,共12页Computer Systems & Applications

基　　金：陕西省自然基金重点项目(2014JZ019);中央高校基本科研业务费资助项目(CHD310824162021)

摘　　要：盲解调技术是获取非协作数字通信信号上携带有用信息的最关键技术之一.首先对现有数字通信信号盲解调进行了综述,然后在我们已发表论文的基础上,进一步完善非线性动力学系统噪声减缩的理论和算法,对负信噪比BPSK调制载频上的随机码流进行盲解调.试测试结果表明,信噪比在Eb/N0>7d B区间,噪声减缩的盲解调的误码率为0,信噪比在0<Eb/N0<7d B区间,噪声减缩的盲解调的误码曲线低于现有非相干解调方法的误码曲线.噪声减缩的盲解调的误码率接近或重合或低于现有相干解调的理论误码曲线.可见,采用非线性动力学系统的噪声减缩的盲解调与现有非相干解调的处理能力比较,至少提高了7d B的处理能力.测试结果表明研究成果为电子侦察信号处理的盲解调提供了一种有效的方法.Blind demodulation is one of the most important technologies to obtain useful information on non cooperative digital communication signals. This article firstly summarizes the blind demodulation of existing digital communication signal. And then it further improves the theory and noise reduction algorithm of nonlinear dynamical system on the basis of our published paper to blind demodulation the random bit stream on carrier frequency modulated by BPSK with negative SNR. The test results show that Bit error rate is 0, using nonlinear dynamical system noise reduction under Eb/N0〉7d B and blind demodulation error curve of noise reduction is lower than the error curve of existing non coherent demodulation method under 0〈Eb/N0〈7d B. Therefore, the blind demodulation of nonlinear dynamical system noise reduction compared with existing non coherent demodulation at least improves the processing capacity of 7 db. Test results show that the research results provide an effective method of blind demodulation for electronic reconnaissance signal processing.

关 键 词：BPSK调制 噪声减缩 盲解调 随机码流 误码率 

分 类 号：TN911.3[电子电信—通信与信息系统]