UWB通信中几种TH-PPM调制信号的性能比较

The Performance Analysis and Comparision of Several Block Wavdform PPM Signal in Ultra-wideband Communication

超宽带通信要克服多径衰落、功率限制、窄带和宽带干扰,为用户提供多址接入、高速率、可靠同步通信,系统必须采用可靠、高效、新颖的调制方案。三种TH-PPM多维调制信号作为UWB通信的多址接入,可以满足系统设计的要求。当利用这三种信号作为UWB多址接入的系统性能、接收机结构复杂度、系统传输速率、抗多径干扰能力时,从接收机结构而言,ORPPM调制信号是最简单;从系统性能角度来看,仅有AWGN干扰时,OPPM是最好;而在多径干扰环境下,NOPPM调制信号最佳。

Wireless spread spectrum multiple access(SSMA)using time hopping and block waveform encoded (Mary) pulse position modulated signals is analyzed.We describe three signal sets with the PPM structure.For different Mary PPM signal designs,the performance in AWGN of the three sets of signals is calculated and the multipleaccess performance is compared in terms of the number of users supported by the system for a given bit error rate,signaltonoise ratio,bit transmission rate ,and number of signals in the Mary set.Their receiver complexity is discussed.In the end ,the performance of the signal over the multipath channel is compared.