Title :
An efficient channel estimation technique for OFDM systems with transmitter diversity
Author :
Gi Jeon, Won ; Hyun Paik, Kyung ; Soo Cho, Yong
Author_Institution :
Sch. of Electron. & Electr. Eng., Chung-Ang Univ., South Korea
Abstract :
We propose an efficient channel estimation technique for orthogonal frequency-division multiplexing (OFDM) systems with transmitter diversity. The proposed technique estimates uniquely all channel frequency responses needed in space-time coded OFDM systems using “comb-type” training symbols. The computational complexity of the proposed technique is reduced dramatically, compared with the previous minimum mean-squared error (MMSE) technique, due to the all the processing being done in the frequency-domain. Also, several other techniques for mitigating the random noise effect and tracking channel variation are discussed to further improve the performance of the proposed approach. The performances of the proposed approach are demonstrated by computer simulation for mobile wireless channels
Keywords :
OFDM modulation; Rayleigh channels; computational complexity; diversity reception; frequency response; frequency-domain analysis; land mobile radio; least squares approximations; parameter estimation; radio tracking; radio transmitters; random noise; MMSE; channel frequency response; comb-type training symbols; computational complexity reduction; computer simulation; efficient channel estimation; frequency-domain processing; independent Rayleigh-fading; minimum mean-squared error; mobile wireless channels; orthogonal frequency-division multiplexing; random noise effect; space-time coded OFDM systems; tracking channel variation; transmitter diversity; Channel estimation; Computational complexity; Computer simulation; Diversity reception; Frequency division multiplexing; Frequency estimation; OFDM; Radio transmitters; Receiving antennas; Transmitting antennas;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881618