基于最佳小波包基的多载波CDMA  

Optimal Wavelet Packet Multicarrier CDMA

作　　者：袁超伟[1] 杨英[1] 

机构地区：[1]北京邮电大学继续教育学院,北京100876

出　　处：《北京邮电大学学报》2001年第3期11-16,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金资助项目 (6 9972 0 10)

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 。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 ration 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.

关 键 词：码分多址联接 小波包 多载波 最佳基 

分 类 号：TN914.53[电子电信—通信与信息系统]