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空时频移键控(ST-FSK)易与跳频通信系统相融合,是一种很有军事价值的调制方式。在介绍ST-FSK基本原理的基础上,文中进一步给出了其发送机和接收机框图,推导了ST-FSK所需的最小频率间隔,讨论了在不同信噪比下不同载波频偏对ST-FSK非相干M L检测器的性能影响。理论分析和仿真结果都表明:①低信噪比弱化了载波频偏对ST-FSK系统可靠性的影响;②相同载波频偏对同等条件下不同进制的ST-FSK误码性能的影响是有所区别的。
Space-Time Frequency Shift Keying (ST-FSK) is easy to integrate with frequency-hopping communication systems and is a very military value modulation method. Based on the introduction of the basic principle of ST-FSK, the block diagram of transmitter and receiver is further given, and the minimum frequency interval required by ST-FSK is deduced. The influences of different carrier frequency offsets on ST -FSK Non-coherent ML detector performance impact. Theoretical analysis and simulation results show that: ① low signal-to-noise ratio weakens the influence of carrier frequency offset on the reliability of ST-FSK system; ② the same carrier frequency offset has the same effect on ST-FSK error performance under different conditions Difference