改进的GMSK正交调制技术实现与仿真分析  

Implementation and Simulation of MSK Demodulation and GMSK Modulation

作　　者：彭玉华[1] 张福洪[1] PENG Yu-hua ZHANG Fu-hong(College of Communication Engineering, Hangzhou Dianzi University, Hangzhou Zhejiang 310018, China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018

出　　处：《通信技术》2017年第4期618-621,共4页Communications Technology

摘　　要：高斯最小频移键控GMSK在最小频移键控MSK的基础上发展而来,是一种典型并广泛应用的连续相位频移调制CPFSK方式,不仅具有MSK调制技术的包络恒定且功率谱密度集中的优点,而且GMSK调制信号带外衰减快,可以满足复杂多变通信环境。在对传统GMSK正交调制解调原理进行研究的基础上,给出一种改进的调制方式,运用查表法思想,将相位分为累积相位和即时相位,简化相位积分的运算量,为硬件实现奠定基础。最后,在MATLAB环境中对其进行了仿真分析。GMSK （Gaussiah Filtered Minimum Shift Keying） is a typical and widely-used continuous phase modulation frequency shift keying way,developed on the basis of MSK（Minimum shift keying） ,which only has the advantage of both constant envelope and power spectral density concentration, and also GMSK modulation signal,for its fast out-of-band attenuation, could meet the requirements of mobile communication.Based on study of the traditional GMSK quadrature modulation and demodulation principle, a modified modulation scheme is proposed, and by using the look-up table method,the phase is divided into the accumulating phase and the instantaneous phase, thus simplifying the calculation of phase integration and laying the foundation for hardware implementation. Finally simulation analysis on its performance is also done in MATLAB environment.

关 键 词：GMSK 正交调制 累加相位 即时相位 

分 类 号：TN919[电子电信—通信与信息系统]