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空时编码多载波码分多址MIMO系统下行频率选择性信道盲估计
引用本文:任爱锋,殷勤业,罗 铭. 空时编码多载波码分多址MIMO系统下行频率选择性信道盲估计[J]. 通信学报, 2005, 26(7): 114-118
作者姓名:任爱锋  殷勤业  罗 铭
作者单位:1. 西安交通大学,电子与信息工程学院,陕西,西安,710049;西安电子科技大学,电子工程学院,陕西,西安,710071
2. 西安交通大学,电子与信息工程学院,陕西,西安,710049
基金项目:国家自然科学基金资助项目(60272071),教育部博士点基金项目(20020698024)
摘    要:基于子空间方法的无线信道盲估计由于其算法的固有特性,使得估计结果与实际信道之间存在一个不确定复系数,无法得到无线信道的精确估计。在利用子空间分解方法对空时编码多输入多输出MC-CDMA系统下行频率选择性信道盲估计的基础上,利用发射符号的有限码集特性,将单载波系统下的模糊复系数盲辨识方法推广到多载波多输入多输出系统,从而得到信道的精确估计。Monte-Carlo仿真表明,在信噪比较低的情况下,本方法的信道估计误差仍然较小。

关 键 词:空时编码  子空间方法  盲信道估计  多输入多输出
文章编号:1000-436X(2005)07-0114-05
收稿时间:2004-06-08
修稿时间:2004-06-08

Downlink frequency-selective fading channel blind estimation for space-time coded MC-CDMA MIMO systems
REN Ai-feng,YIN Qin-ye,LUO Ming. Downlink frequency-selective fading channel blind estimation for space-time coded MC-CDMA MIMO systems[J]. Journal on Communications, 2005, 26(7): 114-118
Authors:REN Ai-feng  YIN Qin-ye  LUO Ming
Abstract:Since inherent characteristic of blind channel estimation algorithm based on subspace method, there existed an ambiguous complex coefficient between estimated channels and real channels. The downlink frequency-selective fading channel estimation problem of the space-time coded (STC) multiple-input multiple-output (MIMO) MC-CDMA systems were focused on. Based on subspace decomposition technique and the subspace orthogonality property, A blind accurate estimation scheme of downlink frequency-selective fading channels for multiuser STC MIMO MC-CDMA systems were derived. Thus, the blind identification method of ambiguous complex coefficient from single carrier systems to multi-carrier MIMO systems were generalized. Monte Carlo simulations show that when the SNR is low, the error of channel estimation is relatively small.
Keywords:space-time code  subspace method  blind channel estimation  MIMO  
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