基于多相滤波的PCM/FM正交解调  

PCM/FM Quadrature Demodulation based on Poly-phase Filter

作　　者：杨小华[1] 姚远程[1] 

机构地区：[1]西南科技大学信息工程学院,四川绵阳621010

出　　处：《通信技术》2011年第11期1-3,共3页Communications Technology

基　　金：国家自然科学基金和NASF联合基金资助:基于软件无线电的中频数字化接收机技术研究(NO.10876035)

摘　　要：传统的相干正交解调方法,需要提取同频同相的载波,从而增加了解调的难度。根据遥测系统脉冲编码调制/调频(PCM/FM,Pulse Code Modulation-Frequency Modulation)信号的特点,采用基于多相滤波的解调方法。该方法通过多相滤波的方式来实现正交变换,不需要在接收端恢复同频同相的载波,从而降低了传统解调方法中电路实现的难度。通过MATLAB对信号进行调制解调的仿真,比较了不同解调方法对信号的解调效果,并在表格中显示了解调的误码率数据,从而验证了该方法的可行性和优越性。The traditional coherent orthogonal demodulation method requires the extraction of carrier signal with the same frequency and phase,thus increasing the demodulation difficulty.According to the characteristics of PCM/FM radio signal in telemetry system,the demodulation method based on Poly-phase filter orthogonal transform technique is adopted.This method,by the multiphase filtering method,realizes orthogonal transformation and requires no recovery of the carrier signal in the receiver,thus reducing the circuit implementation complexity in the traditional demodulation.The demodulation effect of the different methods is simulated with MATLAB and compared,the error rate data given in the table,and the feasibility and superiority of the method verified.

关 键 词：正交解调 多相滤波 脉冲编码调制/调频 遥测系统 

分 类 号：TN911.72[电子电信—通信与信息系统]