Title :
Time-varying channel estimation for MIMO OFDM systems
Author :
Hu, Die ; Yang, Luxi ; He, Zhenya
Author_Institution :
Dept. of Radio Eng., Southeast Univ., Nanjing, China
Abstract :
Time-varying channel estimation methods for MIMO OFDM systems, based on pilot sequences, are investigated. In this paper, we assume that the channel varies in a linear fashion during a block period and express the channel impulse response (CIR) as a function of the middle impulse response and the slope of the channel variation. Hence, the channel estimation method proposed first estimates the middle CIR of the current OFDM symbol and then estimates the slope. The mean square error (MSE) part of the estimation is computed and the optimal pilot sequences which can reduce the MSE are given. The simulation results show that the proposed estimation method has good performance and the use of the optimal pilot sequences can enhance channel estimation.
Keywords :
MIMO systems; OFDM modulation; channel estimation; least mean squares methods; optimisation; time-varying channels; transient response; CIR; MIMO OFDM systems; MSE reduction; channel impulse response; channel variation slope; estimation mean square error; linear varying channel; pilot sequence optimization; time-varying channel estimation; Ambient intelligence; Channel estimation; Estimation error; Helium; MIMO; Mean square error methods; OFDM; Receiving antennas; Time-varying channels; Transmitting antennas;
Conference_Titel :
Intelligent Multimedia, Video and Speech Processing, 2004. Proceedings of 2004 International Symposium on
Print_ISBN :
0-7803-8687-6
DOI :
10.1109/ISIMP.2004.1434008
