Title :
Pilot-aided channel estimation for multiuser MIMO-OFDM systems
Author :
Yang, Qinghai ; Xu, Shaoyi ; Lim, Jong Kyoung ; Kwak, Kyung Sup
Author_Institution :
Graduate Sch. of Inf. Technol. & Telecommun., Inha Univ., Inchon, South Korea
Abstract :
This paper addresses a pilot aided maximum likelihood (ML) channel estimation scheme for the uplink of multiuser multiple-input multiple-out (MIMO) orthogonal frequency division multiplexing (OFDM) systems. We derive the optimal pilot symbols and develop the optimal placement of pilot tones with respect to the mean square error (MSE) of channel estimate. In addition, a gradient algorithm for channel tracking is proposed to enhance the channel estimation.
Keywords :
MIMO systems; OFDM modulation; channel estimation; gradient methods; maximum likelihood estimation; mean square error methods; multiuser channels; radio links; channel tracking; gradient algorithm; mean square error; multiple-input multiple-out orthogonal frequency division multiplexing; multiuser MIMO-OFDM systems; optimal pilot symbols; pilot aided maximum likelihood channel estimation; AWGN; Base stations; Channel estimation; MIMO; Maximum likelihood detection; Maximum likelihood estimation; Mean square error methods; OFDM; Receiving antennas; Transmitting antennas;
Conference_Titel :
Communications and Information Technology, 2005. ISCIT 2005. IEEE International Symposium on
Print_ISBN :
0-7803-9538-7
DOI :
10.1109/ISCIT.2005.1567037
