746RadioCommunicationsTechnologyVol.49No.42023doi:10.3969/j.issn.1003-3114.2023.04.021引用格式:陈建斌,王刚,吴毅杰,等.GMSK多通道接收机的非相干解调算法及FPGA实现[J].无线电通信技术,2023,49(4):746-752.[CHENJianbin,WANGGang,WUYijie,etal.Non-coherentDemodulationAlgorithmandFPGAImplementofGMSKMulti-channelReceiver[J].RadioCommunicationsTechnology,2023,49(4):746-752.]GMSK多通道接收机的非相干解调算法及FPGA实现陈建斌,王刚,吴毅杰,王新玥(上海航天电子技术研究所,上海201109)摘要:针对硬件资源受限的高斯最小频移键控(GaussianFilteredMinimumShiftKeying,GMSK)信号多通道接收机,设计了一种硬件资源占用极少、译码性能良好的解调算法。对通用数字环路硬件资源进行优化,提出了一种改进算法,将环路捕获速度提升了5倍,引入一种位同步算法,该算法同步精度高、占用硬件资源少、采样率低、易于工程实现。并对2-bit差分解调算法进行改进,完成差分解调模块设计。测试结果表明,改进后的差分解调算法比改进前译码性能提升了约2dB。该解调算法与理论值相比仅有0.6dB的解调损耗,具有良好的解调性能,满足工程实际应用需求。关键词:高斯最小频移键控;通用数字环;位同步;2-bit差分解调;FPGA中图分类号:V556.1文献标志码:A开放科学(资源服务)标识码(OSID):文章编号:1003-3114(2023)04-0746-07Non-coherentDemodulationAlgorithmandFPGAImplementofGMSKMulti-channelReceiverCHENJianbin,WANGGang,WUYijie,WANGXinyue(ShanghaiAerospaceElectronicTechnologyInstitute,Shanghai201109,China)Abstract:AimingattheGaussianFilteredMinimumShiftKeying(GMSK)signalmulti-channelreceiverwithlimitedhardwarere-sources,ademodulationalgorithmwithlowhardwareresourceoccupationandgooddecodingperformanceisdesigned.Generaldigitalloophardwareresourcesareoptimized,andanimprovedalgorithmisproposed,whichincreasestheloopcapturespeedby5timesandintroducesabitsynchronizationalgorithmwithhighsynchronizationaccuracy,lesshardwareresources,andlowsamplingrate.Thisap-proachfacilitatesengineeringimplementation.Anda2-bitdifferentialdemodulationalgorithmisimprovedtocompletedifferentialde-modulationmoduledesign.Testresultsshowthattheimproveddifferentialdemodulationalgorithmimprovesdecodingperformancebya-bout2dBco...
