带判决反馈的GMSK差分解调算法研究与实现  

Research and implementation of GMSK differential demodulation algorithm with decision feedback

作　　者：卫洪春[1] 姜凯 

机构地区：[1]四川文理学院,计算机学院,四川达州635000 [2]中原电子集团研发中心,湖北武汉430000

出　　处：《现代电子技术》2014年第17期1-4,8,共5页Modern Electronics Technique

基　　金：国家自然科学基金(61152003)资助项目

摘　　要：在超短波电台通信中,由于GMSK调制算法前后码元之间的相关性,码元之间存在码间串扰,传统的GMSK1比特差分解调算法性能不够理想。在分析GMSK信号特性的基础上,提出一种带判决反馈的1比特差分检测算法。在对两种解调算法进行研究比较后对其进行了仿真,仿真结果表明带判决反馈的1比特差分检测算法在满足解调性能时获得了3 dB的解调增益。最后使用VHDL语言在FPGA芯片中实现了该算法,并已成功用于超短波电台通信系统中。In VHF radio communication,GMSK suffers from significant inter-symbol interference because of its symbols co-herent. Since the traditional 1-bit differential demodulation algorithm of GMSK is not perfect,the 1-bit differential detection algo-rithm with decision feedback is presented based on the analysis of the GMSK signal characteristics. The two demodulation algo-rithms were simulated after comparing the two demodulation algorithms. Simulation results show that 1-bit differential detection algorithm with decision feedback obtains about 3 dB demodulation gain. This algorithm was implemented in FPGA by using VHDL language. It was applied to VHF radio communication succesfully.

关 键 词：GMSK 判决反馈 差分解调 信号特性分析 

分 类 号：TN924-34[电子电信—通信与信息系统]