一种多天线接收的全响应CPM信号解调方法  

A novel demodulation method for full responsible CPM signal based on multiple antenna

作　　者：邵怀宗[1] 吴迪[1] 周莹[1] 

机构地区：[1]电子科技大学通信与信息工程学院,四川成都610054

出　　处：《电波科学学报》2010年第2期297-301,共5页Chinese Journal of Radio Science

摘　　要：由于需要使用匹配滤波器组和复杂的符号与载波同步算法,CPM优化接收机结构复杂。而其非相干解调接收机结构简单,但在低信噪比时,性能较差。针对CPM的这些局限,结合接收天线分集技术,提出了一种适用于全响应CPM信号的非相干解调方法。在该方法中对每路信号进行短时傅立叶变换后进行插值处理来获得谱线包络最大处的频率;然后将各个支路上的输出进行合并,从而直接估计出对应的基带波形;再在基带信号的基础上进行同步处理,恢复出传输的信息。仿真结果表明:该方法可以有效地将对全响应CPM信号进行解调,只要选择合适的接收天线数,可以使非相干解调的性能接近相干解调的性能。Optical CPM receiver is very complex since a large bank of matched filters and high complex symbol and carrier synchronization algorithms must be used;while the non-coherent demodulation receiveris simple,but with bad performance under low SNR.In this paper,a novel non-coherent demodulation method based on multiple antenna for full-response CPM is proposed.The short-time Fourier transform is employed.The frequency is estimated at point of maximum envelope value of spectrum line by interpolation.The baseband signal of frequency-modulation can be obtained by Maximal Ratio Combining for all antennas.The symbol synchronization is operated and information is recovered.The simulation results show that the proposed method can efficiently solve the demodulation problem of full-responsible CPM signal and the performance of the proposed method is close to the optimum receiver when the number of antenna is suitable.

关 键 词：全响应CPM信号 非相干解调 多天线接收机 短时傅立叶变换与插值 

分 类 号：TN911[电子电信—通信与信息系统]