Design for GMSK Frequency-Hopping Communication System Based on Simulink

To seach the best mode of freqyency-hopping modulation,the thesis compares with some digital modulation modes and the factors affecting the error rate of systems is analysed,which include different SNR(Signal Noise Ratio) in each mode and different BT values of GMSK(Gauss filtered Minimum Shift frequency Keying) modulation systems.The error rate is 0.03% under SNR is-4 dB,when the system adopts GMSK modulation.It is better than 2FSK(2-ary Frequency Shift Keying)(the error rate is 3.33%),while it is worse than BPSK(Binary Phase Shift Keying)(the error rate is 0.017%) and MSK(Minimum Shift frequency Keying)(the error rate is 0.02%).GMSK is optimal on the utilization of frequency band.The result indicates that GMSK modulation mode is reasonable and necessary.The modulation and demodulation of GMSK frequecy-hopping signals are simulated by Matlab 's Simulink communication module base.Finally a feasible GMSK frequecy-hopping modulation system is designed.