北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2001, Vol. 24 ›› Issue (3): 11-16.

• 学术论文 • 上一篇    下一篇

基于最佳小波包基的多载波CDMA

袁超伟, 杨 英   

  1. 北京邮电大学继续教育学院, 北京 100876
  • 收稿日期:2000-01-08 出版日期:2001-10-10
  • 作者简介: 袁超伟(1961—),男,博士,教授.
  • 基金资助:
    国家自然科学基金资助项目(69972010)

Optimal Wavelet Packet Multicarrier CDMA

YUAN Chao-wei, YANG Ying   

  1. Continuing Education School, Beijing University of posts and telecommunications, Beijing 100876, China
  • Received:2000-01-08 Online:2001-10-10
  • Supported by:
     

摘要: 得出了如下结论: 接收信号中的噪声分量的平均功率与选用的小波包基无关; 接收信号中的有用信号分量与符号间干扰分量之和与选用的小波包基无关, 但是有用信号分量与符号间干扰分量却分别与选用的小波包基有关. 找到了一种快速搜索最佳小波包基的方案, 可以使有用信号分量与符号间干扰分量的比值(SIR)最大,并通过仿真验证了以上所得结论的正确性.

关键词: 码分多址联接, 小波包, 多载波, 最佳基

Abstract: CDMA is an interference limited system. Of which, the multicarrier CDMA integrate orthogonal frequency division modulation (OFDM) into CDMA,the interference including ISI and ACI is one of the main performance affected issue for multicarrier CDMA. We establish some important conclusions. 1).The noise average power of the receiver signal is independent of the modulation and demodulation scheme. 2).The sum of the required signal and intersymbol interference has no relative with the scheme,but the required signal and intersymbol interference are individually dependent on the scheme.Furthermore,if we change the scheme,an optimum scheme can be found to make the signal to intersymbol interference's ratio maximum.A fast searching optimal wavelet packet bases algorithm is presented to find optimal modulation and demodulation scheme,simulations have been made to prove the above conclusions.

Key words: CDMA, wavelet packet, multicarrier, optimum bases

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