摘要
在多径衰落信道下,提出了一种基于ML的新型离散小波包调制系统.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.
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.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2006年第4期509-513,共5页
Journal of Xidian University
基金
国家自然科学基金和微软亚洲研究院联合资助项目(60372048)
高等学校优秀青年教师教学科研奖励计划
国家自然科学基金重大项目(60496316)
国家"863"计划课题"认知无线电技术研究"(2005AA123910)
教育部科学技术研究重点项目(104171)
作者简介
周雷(1977-),男,西安电子科技大学博士研究生.