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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Zou W Y and Yiuyan Wu. COFDM: An overview [J].IEEETrans. on Broadcasting.1995, 41(1):1-8[2]Foschini G. Layered space-time architecture for wirelesscommunication in a fading environment when usingmulti-element antennas [J].Bell Labs Technical Journal.1996,1(2):41-59[3]Alamouti S M. A simple transmit diversity technique forwireless communications [J].IEEE Journal on Selected Areasin Communications.1998, 16(8):1451-1458[4]Zhang P, Tao X F, and Zhang J H. A vision from Futurebeyond 3G TDD [J]. IEEE Commun Magazine, 2005, 43(1):38-44.[5]Van de Beek J J, Edfors O, and Sandel M, et al.. On channelestimation in OFDM systems [C]. IEEE VTC, Chicago, USA.Jul. 25-28, 1995: 815-919.[6]Li Y, Seshadri N, and Ariyavisitakul S. Channel estimationfor OFDM systems with transmitter diversity in mobilewireless channels [J].IEEE Journal on Selected Areas inCommunications.1999, 17(3):461-471[7]梁永明, 罗汉文, 黄建国. MIMO-OFDM 系统中一种基于自适应滤波的信道估计方法[J].电子与信息学报.2007, 29(2):310-313浏览[8]Auer G, Dammann A, and Sand S. Channel estimation forOFDM systems with multiple transmit antennas byexploiting the properties of the discrete fourier transform [C].PIMRC. Beijing, China. Sep. 7-10, 2003: 1954-1958.[9]Li Y. (Geoffrey)Simplified channel estimation for OFDMsystems with multiple transmit antennas [J].. IEEE Trans. onWireless Communications, Science.2002, 1(1):67-75[10]Min H and Bhargava V K. An investigation into time-domainapproach for OFDM channel estimation [J].IEEE Trans. onBroadcasting.2000, 46(4):240-248[11]Seo J W, Wee J W, and Park Y S, et al.. DFT-based PSAchannel estimation using linear prediction for OFDM systemswith virtual carriers [C]. IEEE VTC, Stockholm, Sweden.May. 30- Jun. 1, 2005: 510-513.[12]唐恬, 姜军, 张平. 一种基于PCC 训练符号的OFDM信道估计方法[J]. 北京邮电大学学报, 2007, 30(4): 37-40.Tang T, Jiang J, and Zhang P. A channel estimationalgorithm for OFDM based on PCC training symbols [J].Journal of Beijing University of Posts andTelecommunications, 2007, 30(4): 37-40.[13]Proakis J G. Digital Communication [M]. 4th Edition. NewYork. McGraw-Hill, 1995: 254-283.[14]Hyunsoo C and Daesik H. Effect of channel estimation errorin OFDM-based WLAN [J].IEEE Commun Letter.2002,6(5):190-192[15][15] ITU-R Recommendation M. 1225, Guidelines for Evaluationof Radio Transmission Technologies for IMT-2000 [S]. 1997.

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