Title :
Adaptive grouping MMSE channel estimation in OFDM-based wireless systems
Author :
Ban, Dae-Seung ; Kim, Cheong-Hwan ; Lee, Yong-Hwan
Author_Institution :
Sch. of Electr. Eng. & INMC, Seoul Nationl Univ., Seoul
Abstract :
In this paper, we design an minimum mean-square error (MMSE)-type channel estimation scheme in orthogonal frequency division multiplexing-based wireless systems. By using the averaged channel frequency response (CFR) of pilot symbols in a group as a representative CFR, the proposed MMSE channel estimator can reduce the mean-square error (MSE) of channel estimation by achieving the signal-to-noise ratio (SNR) gain without increasing the computational complexity compared to conventional MMSE channel estimator. The grouping size of pilot symbols is optimized to minimize the MSE according to the channel correlation characteristics. Finally, the performance of the proposed channel estimation scheme is verified by computer simulation.
Keywords :
OFDM modulation; channel estimation; least mean squares methods; radiocommunication; OFDM-based wireless systems; adaptive grouping MMSE; averaged channel frequency response; channel estimation; minimum mean-square error; orthogonal frequency division multiplexing; pilot symbols; signal-to-noise ratio; Channel estimation; Computer simulation; Delay effects; Frequency division multiplexing; Frequency domain analysis; Frequency estimation; Frequency response; Interpolation; OFDM; Signal to noise ratio; Channel estimation; grouping minimum mean-square error (MMSE); orthogonal frequency-division multiplexing (OFDM);
Conference_Titel :
Communications, 2008. APCC 2008. 14th Asia-Pacific Conference on
Conference_Location :
Tokyo
Print_ISBN :
978-4-88552-232-1
Electronic_ISBN :
978-4-88552-231-4
