| 基于复小波包的OFDM调制方法(CWP-OFDM)的研究 |
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| 引用本文： | 张小东,徐平平,章国安,毕光国.基于复小波包的OFDM调制方法(CWP-OFDM)的研究[J].电子学报,2002,30(4):477-479. |
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| 作者姓名： | 张小东 徐平平 章国安 毕光国 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金 (No .69882 0 0 4 ) |
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| 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(Complex Wavelet Packet)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GSM TU50 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DFT-OFDM同样或更好的误码性能.
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| 关 键 词： | 复小波包 DFT-OFDM CWP-OFDM 多普勒频移 信道估计 |
| 文章编号： | 0372-2112(2002)04-0477-03 |
Study on Complex Wavelet Packet Based OFDM Modulation (CWP-OFDM) |
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| ZHANG Xiao dong ,XU Ping ping ,ZHANG Guo an ,BI Guang guo.Study on Complex Wavelet Packet Based OFDM Modulation (CWP-OFDM)[J].Acta Electronica Sinica,2002,30(4):477-479. |
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| Authors: | ZHANG Xiao dong XU Ping ping ZHANG Guo an BI Guang guo |
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| Affiliation: | 1. NARI Corporation,Nanjing,Jiangsu 210003,China;2. Department of Radio Engineering,Southeast University,Nanjing,Jiangsu 210096,China;3. Nantong Institute of Techcology,Nantong,Jiangsu 226007,China |
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| Abstract: | The 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. |
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| Keywords: | complex wavelet packet DFT OFDM CWP OFDM Doppler frequency shift channel estimation |
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