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基于分数间隔均衡器和ML算法的新型DWPM调制系统
引用本文:周雷,李建东,张光辉.基于分数间隔均衡器和ML算法的新型DWPM调制系统[J].西安电子科技大学学报,2006,33(4):509-513.
作者姓名:周雷  李建东  张光辉
作者单位:西安电子科技大学信息科学研究所宽带无线通信实验室,陕西西安710071
基金项目:国家自然科学基金委员会-微软亚洲研究院联合资助项目;高等学校优秀青年教师教学科研奖励计划;国家自然科学基金;国家高技术研究发展计划(863计划);教育部科学技术研究重点项目
摘    要:在多径衰落信道下,提出了一种基于ML的新型商散小波包调制系统.利用基于LMS算法的分数间隔均衡抑制由多径衰落信道引起的码间干扰并且利用最大似然算法对解调后的码元进行检测.在多径衰落信道和白高斯噪声情况下,分析了基于小波包的新型多载波调制系统的传输性能.仿真结果表明,所提出的基于小波包的新型多载波调制系统的性能要优于传统的正交频分复用多载波调制系统.

关 键 词:离散小波包调制  分数间隔均衡器  最大似然检测算法  多径衰落信道  LMS算法
文章编号:1001-2400(2006)04-0509-05
收稿时间:2005-08-06
修稿时间:2005-08-06

Novel DWPM system based on fractionally spaced equalizers and the maximum likelihood algorithm
ZHOU Lei,LI Jian-dong,ZHANG Guang-hui.Novel DWPM system based on fractionally spaced equalizers and the maximum likelihood algorithm[J].Journal of Xidian University,2006,33(4):509-513.
Authors:ZHOU Lei  LI Jian-dong  ZHANG Guang-hui
Affiliation:Lab. of Broadband Wireless Communications, Research Inst. of Information Science, Xidian Univ., Xi′an 710071, China
Abstract:A novel Discrete Wavelet Packet Modulation(DWPM) system based on Fractionally Spaced Equalizers(FSE) and the Maximum Likelihood(ML) algorithm is studied for multipath fading channels.The proposed FSE based on the least mean square(LMS) algorithm can mitigate the detrimental effects of the inter-symbol interference(ISI) caused by the multipath fading channel.The demodulated symbols are detected by the maximum likelihood(ML) algorithm.The transmission performance is analyzed in the multipath fading channel and the Additive Gaussian White Noise(AWGN).Simulation results show that the proposed DWPM scheme can provide greater immunity to multipath fading channels and AWGN than the traditional orthogonal frequency division multiplexing(OFDM) scheme.
Keywords:DWPM  fractionally spaced equlizers  maximum likelihood algorithm  multipath fadingchannels  LMS algorithm
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