用户间UWB脉冲相互正交的TH-BPSK超宽带系统  

A TH-BPSK Ultra-Wide Bandwidth System Based on Different User Using Mutual Orthogonal UWB Waveform

作　　者：李耀民[1] 朱雪田[1] 周正[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《北京邮电大学学报》2004年第5期65-69,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：教育部科学技术研究重点项目(03035);国家"863计划"项目(2003AA123240);国家自然科学基金项目(60372097)

摘　　要：超宽带(UWB)系统中各用户通常使用同一种UWB脉冲发送数据,系统中存在多用户干扰,使系统误码率(BER)升高.为减小多用户干扰,以修正的Hermite多项式作为一组正交的UWB脉冲,提出了一种基于正交UWB脉冲的TH-BPSK(跳时二相相移键控超宽带系统),系统中每个用户使用的UWB脉冲互不相同,而且是相互正交的,由于UWB脉冲的正交性,在系统实现时隙同步的基础上,接收机可减小系统中的多用户干扰,系统的BER性能得到很大的提高.理论计算和仿真结果表明:与系统中各用户仅使用一种UWB脉冲的TH-BPSK超宽带系统相比,提出的系统具有更低的BER.An UWB(ultra wide band) system usually transmits the same UWB impulse for all users. When many users are active in the system simultaneously, the effects of multi-user interference are great and the system BER(bit error rate) is high. A TH-BPSK UWB system is proposed to decrease the effects of multi-user interference. Each user is assigned a different orthogonal UWB impulse of the modified Hermite polynomial function. Due to the orthogonality of UWB impulses, the multi-user interference can be eliminated completely if chip synchronism is assumed and the system BER performance is enhanced. Simulation results and theoretical analysis indicate that the proposed system has much lower BER compared with the TH-BPSK UWB system using the same UWB impulse.

关 键 词：超宽带 Hermite函数 正交 跳时二相相移键控 

分 类 号：TN914.3[电子电信—通信与信息系统]