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| Performance Analysis and Enhancement of Channel Estimation for STBC-OFDM Systems with Virtual Subcarriers |
| Wang Yi①②; Tao Xiao-feng①②; Zhang Ping①② |
| ① Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China; ②Wireless Technology Innovation Institute, Beijing 100876, China |
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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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Received: 05 November 2007
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2009, Vol. 31 
