离散正交波分系统及其MMSE均衡器设计  

Discrete Orthogonal Wavelet Division Multiplexing Systems and MMSE Equalizer Design

作　　者：史思红[1] 王会琦[2] 

机构地区：[1]海南师范大学数学与统计学院,海南海口571158 [2]四川大学数学学院,四川成都610064

出　　处：《福建师范大学学报（自然科学版）》2014年第4期32-37,117,共7页Journal of Fujian Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(11301360);海南省自然科学基金资助项目(114004)

摘　　要：正交频分复用(OFDM)作为一种高速无线传输技术被广泛用于下一代无线通信系统,但目前常用的指数基内在缺陷制约了其性能的进一步提升.首先利用小波基替代传统指数基,并通过分析二尺度方程,推导出了基于离散小波变换(DWT)的正交波分复用(OWDM)系统的矩阵表达形式,在此基础上设计了多径衰落信道下的最小均方误差(MMSE)均衡器,最后的系统仿真表明当选择合适的小波基类型,所提出的OWDM系统可以有效改善传统OFDM系统性能.Orthogonal frequency division multiplexing （OFDM） has been widely used in next generation wireless communicatiuon systems as a kind of high speed wireless transmission technology, however, the exponent bases in OFDM system constraint the performance improvement. Firstly, the conventional exponent bases are replaced by wavelet bases, the matrix expression of discrete wavelet transform （DWT） based orthogonal wavelet division multiplexing （OWDM） system is dedueed by analyzing double sealing equation, secondly, the minimal mean square error （MMSE） based equalizer is proposed under muhipath fading channel, finally, the system simulations show that the proposed OWDM system performs much better than conventional OFDM system, when the suitable wavelet type is applied.

关 键 词：通信传输技术 多载波调制 小波变换 最小均方误差 

分 类 号：TN929[电子电信—通信与信息系统]