【作者】 吴宣利； 沙学军； 张乃通；

【Author】 WU Xuan-li, SHA Xue-jun, ZHANG Nai-tong (Harbin Institute ofTechnoiogy, Communication Research Center, Harbin, 150001, China)

【机构】 哈尔滨工业大学通信技术研究所；

【摘要】 在基于窄脉冲的超宽带(Ultra-Wideband)系统中,经常使用高斯函数来传送信息,然而由于系统中所有用户使用相同的发射脉冲,使得多用户干扰非常大,进而导致系统的误码率也很高。为了降低多用户干扰的影响,本文提出了一种新型的基于正交小波的脉冲波形构造方法——组合波形,并且将这种波形连同跳时序列一起应用到多用户系统中。文中以基于Meyer正交小波的组合波形为例,在TH-BPSK系统中从理论和仿真两方面分析了该方法。结果表明组合波形能够有效地减小多用户干扰并可以实现自适应频谱包络。更多还原

【Abstract】 In impulse radio ultra-wideband (UWB) systems, Gaussian pulse is usually the waveform used to transmit data, however when all the users in a system use same waveform, the effects of multi-user interference (MUI) are great, and then the system bit error rate (BER) is high. In order to reduce the effects of MUI, this paper presents a novel waveform design method based on wavelet-combined waveform, and this waveform is used in a multiple access system with time hopping (TH) sequence. Meyer wavelet based combined waveform is employed as an example, and in a TH-BPSK system this design method is analyzed from two aspects: theory and simulation. Results show that combined-waveform can reduce MUI efficiently and reach the goal of adaptive spectrum envelope.更多还原