振动环境下GMSK与QPSK性能对比

Performance Comparison of GMSK and QPSK for a Vibration Environment

针对频率源在振动环境中相位噪声恶化的问题,开展GMSK调制和QPSK调制受相位噪声影响的对比分析。首先,对频率源的振动敏感特性进行分析。然后,推导GMSK和QPSK受相位噪声影响的误码率函数,指出相位噪声恶化将导致误码性能下降,并且对QPSK的影响更大。随后,采用某振动环境的相位噪声数据进行仿真和分析,得出与理论推导相同的结论。最后,结合工程实践给出可以采用信道编译码改善系统性能的建议。

In view of the deterioration of the phase noise of frequency source in vibration environ-ment,the performance comparison of GMSK and QPSK is analyzed.Firstly,the vibration sensitiv-ity of frequency source is analyzed.Then,the bit error rate function of GMSK and QPSK affected by phase noise is deduced,and it is pointed out that the deterioration of phase noise will lead to the decline of bit error rate performance,and the impact on QPSK is even worse.Then,the com-parison of a vibration environment is simulated and analyzed,and the same conclusion is ob-tained as the theoretical derivation.Finally,a suggestion of using channel coding to improve sys-tem performance is proposed.