Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (9): 20-24.doi: 10.3969/j.issn.1000-565X.2010.09.004

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

Multiple Access Scheme of Ultra-Wideband System in Fractional Fourier Transform Domain

Qiu Xin  Sha Xue-jun  Ning Xiao-yan   

  1. Communication Research Center,Harbin Institute of Technology,Harbin 150080,Heilongjiang,China
  • Received:2009-11-11 Revised:2010-03-17 Online:2010-09-25 Published:2010-09-25
  • Contact: 沙学军（1966-），男，教授，博士生导师，主要从事超宽带通信系统、变换域通信系统、adhoe传感器网络等研究．E—mail：shaxuejun@hit．edu．cn E-mail:qiuxin100@163．com
  • About author:邱昕（1984-），女，博士生，主要从事变换域通信系统、泛在网络研究．
  • Supported by:

    国家“973”计划项目（2007CB310606）; “新一代宽带无线移动通信网”国家科技重大专项（2009ZX03004-001）

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Abstract:

Proposed in this paper is a multiple access scheme based on fractional Fourier transform（FrFT） to improve the bit error rate（BER） performance of ultra-wideband（UWB） system.In this scheme,with the combination of TDMA（Time Division Multiple Access） and the utilization of phase change in waveform selection,a set of orthogonal pulse waveforms are designed and applied to the ultra-wideband system.Then,based on the energy-aggregating characteristics of the signal in the order-FrFT domain,filtering is conducted to reduce the multiple access interference.Simulated results indicate that the proposed scheme effectively improves the system capacity and the orthogonality among pulse waveforms,and that the filtering in FrFT domain further improves the BER perfor-mance of the system.

Key words: ultra wideband, fractional Fourier transform, multiple access, bit error rate, single-frequency interference