基于复小波包的OFDM调制方法(CWP-OFDM)的研究  

Study on Complex Wavelet Packet Based OFDM Modulation (CWP-OFDM)

作　　者：张小东 徐平平[2] 章国安[3] 毕光国[2] 

机构地区：[1]南瑞集团通信系统分公司,江苏南京210003 [2]东南大学无线电系,江苏南京210096 [3]南通工学院,江苏南通226007

出　　处：《电子学报》2002年第4期477-479,共3页Acta Electronica Sinica

基　　金：国家自然科学基金 (No .69882 0 0 4 )

摘　　要：目前 ,基于DFT变换的OFDM高效调制方法 (DFT OFDM)已经成为无线传输领域中的重要研究热点 .但是 ,为达到较高的业务质量 ,DFT OFDM采用了插入循环前缀 (CP)的办法以减少ISI,从而降低了频谱利用率 .为进一步改善频谱的利用效率 ,本文提出一种基于复小波包 (ComplexWaveletPacket)正 /反变换的OFDM调制方法 (CWP OFDM) ,并且将其与DFT OFDM进行比较 .仿真结果表明 ,在GSMTU5 0信道环境中 ,当具有更高频谱效率的情况下 ,CWP OFDM可以具有与DFTThe DFT based OFDM has currently been mostly focused in the area of wireless communications.To attain to a high level QOS and reduce ISI,cyclic prefixes are inserted between DFT OFDM symbols,which decrease the efficiency of spectrum.To improve spectrum efficiency,a complex wavelet packet transform based OFDM (CWP OFDM) is proposed in this paper and used to compare with the DFT OFDM under the same conditions.Simulation results show that,over GSM TU50 channels,when there is a much higher efficiency in using wireless spectrum,CWP OFDM performs the same as or better than DFT OFDM.

关 键 词：调制方法 复小波包 CWP-OFDM 多普勒频移 信道估计 无线通信 

分 类 号：TN92[电子电信—通信与信息系统]