空载波对STBC-OFDM系统信道估计性能的影响分析与改进

王轶; 陶小峰; 张平

doi:10.3724/SP.J.1146.2007.01730

空载波对STBC-OFDM系统信道估计性能的影响分析与改进

doi: 10.3724/SP.J.1146.2007.01730

基金项目:

国家863计划项目(2006AA01Z260)和国家自然科学基金重大项目(NSF60496312)资助课题

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出版历程
- 收稿日期: 2007-11-05
- 修回日期: 2008-04-23
- 刊出日期: 2009-03-19

Performance Analysis and Enhancement of Channel Estimation for STBC-OFDM Systems with Virtual Subcarriers

摘要

摘要: 该文分析了空时分组码-正交频分复用(STBC-OFDM)系统中，空载波对基于离散傅里叶变换(DFT)信道估计的性能影响，推导得出空载波影响下信道估计均方误差及误码率的解析式，并提出一种新的信道估计方法，通过时域乘以干扰因子矩阵的逆消除空载波引起的混叠，提高信道估计精度。仿真结果与理论结果相符，且表明改进的信道估计算法有效消除均方误差地板现象，提高系统性能。
- 正交频分复用;信道估计;空时分组码;空载波
Abstract: Performance of Discrete Fourier Transform (DFT) based channel estimation for Space Time Block Code-Orthogonal Frequency Division Multiplexing (STBC-OFDM) systems with virtual subcarriers is analyzed. The concise expressions for Mean Squared Error (MSE) and corresponding Bit Error Rate (BER) with the effect of virtual subcarriers are provided. Besides, a new channel estimation method based on zero-forcing is presented to eliminate aliasing distortion caused by virtual subcarriers. Simulation results demonstrate the accuracy of the analysis and the efficiency of new method.

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