一种2FSK非相干盲解调系统设计
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摘要
针对复杂电磁环境下通信侦察接收机侦收的通信信号难以被准确解调的问题,在传统差分解调算法的基础上设计出一种2FSK信号非相干盲解调算法。该算法利用估计的载波频率将信号下变频到准基带,通过差分解调算法解调出基带信号,利用基于码元跳变点的定时同步算法完成实时解调处理。仿真结果表明,该算法抗噪声与载频估计误差性能好,当SNR≥4 d B时,解调算法的误码率(BER)小于1%。
Considering the problem that the communication signals which received by communication reconnaissance receiver is difficult to be accurately demodulated in complex electromagnetic environment,a 2FSK non-coherent blind demodulation algorithm based on traditional differential demodulation algorithm is designed. This algorithm uses the estimated carrier frequency to down-converting the received signal to quasi baseband,obtains the baseband signal via the differential demodulation algorithm and completes the demodulation processing by using timing synchronization algorithm which is based on coding changing. The simulation results show that the algorithm has better anti-noise performance and high carrier frequency estimation error resistance. And the bit error rate( BER) of the demodulation of 2FSK signal is less than 1% when the SNR is equal or more than 4 d B.
Considering the problem that the communication signals which received by communication reconnaissance receiver is difficult to be accurately demodulated in complex electromagnetic environment,a 2FSK non-coherent blind demodulation algorithm based on traditional differential demodulation algorithm is designed. This algorithm uses the estimated carrier frequency to down-converting the received signal to quasi baseband,obtains the baseband signal via the differential demodulation algorithm and completes the demodulation processing by using timing synchronization algorithm which is based on coding changing. The simulation results show that the algorithm has better anti-noise performance and high carrier frequency estimation error resistance. And the bit error rate( BER) of the demodulation of 2FSK signal is less than 1% when the SNR is equal or more than 4 d B.
引文
[1]许小东.非协作数字通信系统盲解调[D].安徽:中国科学技术大学,2007.
[2]樊昌信.通信原理教程[M].北京:电子工业出版社,2004.
[3]李琦,杨幸芳,刘丁.一种2FSK解调算法的DSP实现[J].现代电子技术,2004(3):84-86.
[4]王伟,张靖,王伟伟.FSK信号非相干解调的数字实现[J].无线电通信技术,2010,36(4):61-64.
[5]王楠,古瑞江,于宏毅.一种新型的FSK解调系统设计[J].通信技术,2008,41(9):29-31.
[6]屈超.一种高速跳频信号跳时钟恢复方法[J].无线电通信技术,2013,39(4):67-69.
[7]王永庆,乔媛,吴嗣亮.基于早迟门位同步环的FPGA实现[J].微计算机信息,2009,25(3-2):178-180.
[8]王兰勋,荣民.一种位同步时钟提取方案及实现[J].无线电工程,2003,33(10):59-61.
[9]胡延平,李纲,王展,等.一种基于DSTFT解调2FSK信号的新方法[J].通信学报,2000,21(6):54-59.
[10]毛炜,金荣洪,李家强,等.基于HHT变换的时频分析法及其在2FSK系统解调中的应用[J].电子与信息学报,2006,28(12):2 318-2 322.
[2]樊昌信.通信原理教程[M].北京:电子工业出版社,2004.
[3]李琦,杨幸芳,刘丁.一种2FSK解调算法的DSP实现[J].现代电子技术,2004(3):84-86.
[4]王伟,张靖,王伟伟.FSK信号非相干解调的数字实现[J].无线电通信技术,2010,36(4):61-64.
[5]王楠,古瑞江,于宏毅.一种新型的FSK解调系统设计[J].通信技术,2008,41(9):29-31.
[6]屈超.一种高速跳频信号跳时钟恢复方法[J].无线电通信技术,2013,39(4):67-69.
[7]王永庆,乔媛,吴嗣亮.基于早迟门位同步环的FPGA实现[J].微计算机信息,2009,25(3-2):178-180.
[8]王兰勋,荣民.一种位同步时钟提取方案及实现[J].无线电工程,2003,33(10):59-61.
[9]胡延平,李纲,王展,等.一种基于DSTFT解调2FSK信号的新方法[J].通信学报,2000,21(6):54-59.
[10]毛炜,金荣洪,李家强,等.基于HHT变换的时频分析法及其在2FSK系统解调中的应用[J].电子与信息学报,2006,28(12):2 318-2 322.