GMSK调制及其在软件无线电上的应用  

Modulation of GMSK and its implementation in software radio based on MATLAB

作　　者：陈淑融[1] 王勇[1] 

机构地区：[1]南京邮电大学,南京210003

出　　处：《电子测试》2010年第5期81-85,共5页Electronic Test

摘　　要：GMSK(高斯最小移频键控)是一种典型的连续相位调制方式,具有包络恒定、频谱紧凑、抗干扰能力强等特点。本文阐述了GMSK调制的原理与特点,提出了其在软件无线电发射机系统中的应用,通过MATLAB软件,利用Simulink建模仿真,详细分析了各模块作用及设置,最后给出了GMSK信号调制的信号仿真图。仿真结果表明,GMSK基带信号具有良好的功率谱,同时能够有效避免I/Q两条支路信号幅度及正交载波相位失衡,可有效降低邻道干扰,在通信中有广阔的应用前景。Minimum Gaussian frequency shift keying（GMSK）is a typical continuous phase modulation method,which has the characteristics of constant envelope,compact spectrum.and anti-jamming performance.This paper introduces the theory and property of GMSK modulation,provides its implementation in the transmitter of SDR（software definition radio） system.through the MATLAB software,modeling and simulation using simulink,analyse detialed the role of each module and the setting up,finally gives the plot for simulation signals of GMSK modulation.Simulation result show that GMSK signal has nice PSD.Also,the effect of quadrature phase error and amplitude imbalance is avoided. Besides,GMSK can effectively reduce inter—channel interference,and has been widely used in the communication system.

关 键 词：GMSK MATLAB 软件无线电 仿真 

分 类 号：TN911.3[电子电信—通信与信息系统]