一种突发模式下GMSK信号相干解调的方法

GMSK信号是一种连续相位调制方式，由于它具有较好的功率效率和频谱利用率，因此在无线通信领域得到广泛的应用。在此给出一种适合于数字化处理的突发GMSK调制信号的相干解调方式，利用基于FFT的载波频偏及符号时钟误差联合估计算法，实现前导字检测以及频偏和符号定时误差的估计和补偿。采用基于匹配滤波的前向位同步技术实现位同步，对存在残留频偏误差情况下该相干解调系统的解调性能进行了计算机仿真分析。仿真和实验表明，该解调方法具有良好的误码性能。

Coherent Demodulation of GMSK Signal in Burst Mode

The coherent demodulation of GMSK modulation signal in burst mode which is fit for digital processing is presented. Based on the FFT algorithm of joint symbol timing error and frequency offset estimation, the detection of the preamble is completed and the symbol timing error and frequency offset are compensated. The technique is adopted based on the match filtering to realize the bit synchronization. The performance of the coherent demodulation system with residual frequency offset was also simulated. The results of the simulation and the test show that the performances of the demodulation system are all right.