Title :
Low rank channel estimation for space-time coded wideband OFDM systems
Author :
Gong, Yi ; Letaief, K.B.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ. of Sci. & Technol., China
fDate :
6/23/1905 12:00:00 AM
Abstract :
To provide high-speed data transmission for the next generation wireless communication systems employing multiple transmit antennas, a space-time coded orthogonal frequency division multiplexing (OFDM) system has previously been proposed as a promising and efficient approach with both transmit diversity and high coding gains. In this paper, we study the channel estimation for spacetime coded OFDM using least squares (LS) and minimum mean-squared error (MMSE) criteria. In particular, the MSE bounds are given for the temporal channel estimations. By assuming that the channel frequency response is quasi-static over two consecutive OFDM symbols, a low rank Wiener filter based channel estimator is proposed. This significantly reduces the computation complexity while retaining accurate frequency domain channel estimation. Numerical results are provided to demonstrate the performance of the low-rank frequency-domain channel estimation for space-time coded OFDM systems
Keywords :
OFDM modulation; Wiener filters; antenna arrays; broadband networks; fading channels; least mean squares methods; mobile radio; modulation coding; multipath channels; transmitting antennas; MMSE criteria; channel frequency response; coding gains; computation complexity; frequency domain channel estimation; high-speed data transmission; least squares; low rank Wiener filter based channel estimator; low rank channel estimation; minimum mean-squared error criteria; multiple transmit antennas; next generation wireless communication systems; space-time coded orthogonal frequency division multiplexing; space-time coded wideband OFDM systems; transmit diversity; Channel estimation; Data communication; Frequency estimation; Frequency response; Least squares approximation; OFDM; Transmitting antennas; Wideband; Wiener filter; Wireless communication;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.956875