中文摘要：

在瑞利衰落信道和同步多用户环境下，分别针对逐符号检测和按序列检测两种信号检测方法，从理论上分析了差分跳频通信系统的误符号性能，同时做出相应的计算机仿真。仿真结果证实了差分跳频通信技术和按序列检测方法的结合，使系统的多用户性能得到了一定程度的提升。

英文摘要：

Symbol-by-symbol detection and sequence detection are adopted in differential frequency-hopping （DFH） system. With these two detection methods, the synchronous multi-user performances of DFH system are analyzed over Rayleigh-fading channels. Simulations validate the analyses. The results of analyses and simulations prove that the DFH system with sequence detection can achieve better synchronous multi-user performance than that of conventional frequency-hopping （FH） systems.