基于FPGA的改进正交GMSK调制器  

An implementation orthogonal GMSK modulator based on FPGA

作　　者：韩喆[1] 宁永海[1] 沈森[1] 

机构地区：[1]河南科技大学电子信息工程学院,河南洛阳471003

出　　处：《电源技术》2013年第2期292-294,共3页Chinese Journal of Power Sources

摘　　要：GSM系统中采用GMSK调制方式。GMSK调制恒定包络,且具有较高的频谱利用率,与其它调制技术相比,GMSK具有频谱副瓣低、带外辐射小等优点。目前,GMSK调制主要有锁相环与正交调制两种实现方式,随着软件无线电的提出,正交调制实现方式逐渐得到广泛的研究与应用。介绍了利用波形存储正交调制法调制GMSK的方法,同时利用单象限正余弦波形存储结构降低波形存储容量,提高了硬件的性能。GSM system uses GMSK modulation. GMSK modulation has the characteristics of constant envelope, and high spectral efficiency, compared with other modulations, the advantages of GMSK with low side lobe spectrum and small-band radiation. Currently, there are two ways which are phase-locked loop and orthogonal modulation for GMSK modulation, the former of which has been in the earlier application. But with the proposed of software radio, orthogonal modulation implementation get widely research and application. The use of the waveform storage and orthogonal modulation of the GMSK was presented. At the same time, the single-quadrant cos （sin） waveform storage structure was used to reduce storage capacity and improve hardware performance.

关 键 词：GMSK 正交调制 FPGA 

分 类 号：TM935.25[电气工程—电力电子与电力传动]