音频MFSK数字解调算法设计及DSP实现  

Digital Demodulation Algorithm Design and DSP Realization of Audio MFSK Signal

作　　者：王俊蕊[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电通信技术》2008年第1期32-34,51,共4页Radio Communications Technology

摘　　要：针对音频多进制数字频率调制MFSK信号的特点,设计了一种适用于全数字接收机的非相干数字解调算法。算法主要包括数字滤波、数字变频、求瞬时相位、求瞬时频率、中值滤波、抽取和定时恢复环路几部分。重点介绍MFSK多电平基带的码元定时恢复环路的设计方法,对解调中要注意的几个问题进行了强调说明。在对解调性能进行仿真的基础上,在DSP硬件平台上进行了物理实现验证。This paper designs a kind of noncoherent digital demodulation algorithm adapted to all - digital receivers according to the characteristics of M - ary digital frequency modulated MFSK audio frequency signal. The algorithm mainly includes the digital filter, digital frequency conversion, instantaneous phase, instantaneous frequency, median filter, decimation filter and timing recovery loop. The paper puts emphasis on the method of timing recovery loop aimed at the multi - level baseband of MFSK signal, and explains the questions to be noted in demodulation, and introduces the realization of the algorithm by DSP hardware platform after simulating the performance of the demodulation.

关 键 词：MFSK 非相干 数字解调 DSP 

分 类 号：TN763[电子电信—电路与系统]