MFSK信号新型正交解调算法  

Novel quadrature demodulation algorithm on MFSK

作　　者：钱者凤 QIAN Zhe-feng(The 50th Research Institute of China Electronics Technology Group Corporation,Shanghai 200331,China)

机构地区：[1]中国电子科技集团公司第五十研究所,上海200331

出　　处：《电子设计工程》2018年第21期106-109,114,共5页Electronic Design Engineering

摘　　要：对数字化正交解调技术进行研究,从仪器系统设计的灵活性和通用性出发,提出MFSK信号的新型正交解调算法,对下变频后的基带同向和正交分量进行鉴频运算,根据瞬时频率符号跳变检测和双线性插值算法提取位同步信号,抽样判决得到码元信息,根据实际调制映射关系解出比特数据。本方案成功用于某通信测试仪项目,实现了2FSK、4FSK信号的解调,数据源选用自定义码和随机码(PN9、PN11),并实现了误码分析。This paper focuses on the digital quadrature demodulation technology.To aim at the characteristic of flexibility and universality,the new algorithm ofquadraturedemodulation is proposed to demod the signal of 4 FSK.Choose frequency discriminator on base data after digital down converter,realizing symbol synchronization based on symbolic jump of instantaneous frequency. Get symbols by Sampling decision. bitsare demoded on the basis of modulation mapping. This method of MFSK demodulation is succeededused in communicationtest instrument item. Design and realize the demodulation of MFSK signal and the error code analysis. Data source can be pseudo-random code and user-designed code.

关 键 词：正交解调 鉴频算法 位同步 调制映射 

分 类 号：TN92[电子电信—通信与信息系统]