Title :
Low Complexity Fast LMMSE-Based Channel Estimation for OFDM Systems in Frequency Selective Rayleigh Fading Channels
Author :
Hou, Shibo ; Jiang, Jiamo
Author_Institution :
Key Lab. of Universal Wireless Commun., Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
Channel estimation (CE) is a challenging problem and one of the key technologies in Orthogonal Frequency Division Multiplexing (OFDM) systems. The Linear Minimum Mean Square Error (LMMSE) proposed for OFDM systems has excellent Mean Square Error (MSE) performance. However, the conventional method requires the statistical knowledge of the channel information in advance and the complicated inverse operation of large dimension matrices. In this case, an enhanced fast LMMSE channel estimation using Fast Fourier Transform (FFT) operation and the most significant taps (MST) algorithm for OFDM systems is proposed. This method has the advantage of low computational complexity and no requirement on the detailed channel information. In addition, simulation results demonstrate that the proposed algorithm outperforms other LMMSE methods in terms of bit error rate (BER) without the loss of MSE performance.
Keywords :
OFDM modulation; Rayleigh channels; channel estimation; error statistics; least mean squares methods; BER; FFT operation; MSE performance; MST algorithm; OFDM system; bit error rate; channel information; computational complexity; fast Fourier transform; frequency selective Rayleigh fading channel; linear minimum mean square error; low complexity fast LMMSE-based channel estimation; most significant taps; orthogonal frequency division multiplexing system; Bit error rate; Channel estimation; Complexity theory; Correlation; Estimation; Fading; OFDM;
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2012 IEEE
Conference_Location :
Quebec City, QC
Print_ISBN :
978-1-4673-1880-8
Electronic_ISBN :
1090-3038
DOI :
10.1109/VTCFall.2012.6398922