基于差分检测的多载波无线通信系统研究

Study on multi-carrier wireless communication system based on differential detection

针对载波相位难以恢复的不足,在研究的基础上选择了独特的方式对多载波频域扩频码片级差分进行检测,检测时克服各种难度,同时对接收机设计进行简化。该方法可提高直接序列扩频系统抵抗信道时间选择性衰落的能力,同时针对多载波频域扩频码片级差分检测的误码率性能进行理论分析。仿真实验表明,该方法可减少载波间干扰对码片级差分检测的影响,改善了在时间选择性较强的多载波频域扩频码片级差分检测信道中的性能。

To overcome the shortcoming that the carrier phase is difficult to restore,the unique method is selected to detectthe multi?carrier frequency domain spreading code chip?level difference to overcome various test difficulties,and the receiver de?sign is simplified. This method can improve the ability of direct sequence spread spectrum system resisting the channel time selec?tive fading. The bit error rate performance of the multi?carrier frequency domain spreading code chip?level differential detection isanalyzed in this paper theoretically. The simulation experiment results show this method can reduce the effect of inter?carrier inter?ference on code chip?level differential detection,and improve the performance of multi?carrier frequency domain spreading codechip?level differential detection with strong time selectivity in the channel.