摘要
在基于窄脉冲的超宽带(UWB)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,进而恶化了系统的误码率。为了降低多用户干扰的影响,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M eyer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。
In impulse radio ultra-wideband (UWB) systems, when all the users use same pulse waveform, the effects of multi-user interference (MUI) are great, and then the system bit error rate (BER) is deteriorated. In order to reduce the effects of MUI, this paper presents a novel waveform design method based on wavelet-combined waveforms, 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.
出处
《南京邮电大学学报(自然科学版)》
2006年第2期12-16,共5页
Journal of Nanjing University of Posts and Telecommunications:Natural Science Edition
基金
国家自然科学基金重点项目(60432040)资助项目