Title :
Decision-directed channel estimation method for OFDM systems with high velocities
Author :
Ran, Jianjun ; Grunheid, R. ; Rohling, Hermann ; Bolinth, Edgar ; Kern, Ralf
Author_Institution :
Dept. of Telecommun., Technische Univ. Hamburg-Harburg, Hamburg, Germany
Abstract :
The preamble-based channel estimation schemes typically applied in both the HIPERLAN/2 and IEEE 802.11a systems cannot fulfill the requirements in scenarios with high velocities. Therefore, this paper deals with the decision-directed estimation (DDE) method for a blind channel estimation procedure. With the help of the output decision symbols from the demodulator at the receiver side, the statistical characteristics of the transmitted data via the noisy fading channel are applied for tracking the fast changing channel transfer function. As a result, DDE can improve the performance of OFDM systems in high velocity applications with a very low computation complexity.
Keywords :
OFDM modulation; channel estimation; computational complexity; fading channels; statistical analysis; transfer functions; wireless LAN; OFDM systems; blind channel estimation; channel transfer function; computation complexity; decision-directed channel estimation method; high performance local area network; noisy fading channel; orthogonal frequency division multiplexing; preamble-based method; recursive filter; statistical characteristics; Bandwidth; Blind equalizers; Channel estimation; Demodulation; Diversity reception; Fading; OFDM modulation; Radio access networks; Transfer functions; Wireless LAN;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
Print_ISBN :
0-7803-7757-5
DOI :
10.1109/VETECS.2003.1208811
