Title :
Highly Time Varying Channel Estimation for OFDMA Uplink Transmission in IEEE 802.16e Network
Author :
Rabbi, Mohammad Fazle ; Hou, Shengwei ; Ko, C.C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore
Abstract :
Basis expansion model (BEM) based estimation is studied for highly time varying OFDMA uplink channel. We consider two popular pilot patterns-pilot placed over frequency-time grid as proposed in IEEE 802.16e standard and pilot placed on the time axis. In a high Doppler spread scenario, taking intercarrier interference (ICI) impact from data block into account, least square (LS) estimator is developed for both time and frequency domain pilot aided estimation. From the performance analysis and simulation result, it is shown that, time domain LS (LS-T) estimator performs better than the current frequency domain estimator. The computational complexity for time domain LS is also discussed.
Keywords :
OFDM modulation; WiMax; channel estimation; computational complexity; frequency division multiple access; frequency-domain analysis; intercarrier interference; least squares approximations; time-domain analysis; time-varying channels; Doppler spread scenario; IEEE 802.16 network; OFDMA uplink transmission; WiMax; basis expansion model; computational complexity; frequency domain pilot aided estimation; intercarrier interference; least square estimator; orthogonal frequency division multiple access; pilot patterns-pilot; time domain pilot aided estimation; time varying channel estimation; Analytical models; Channel estimation; Computational complexity; Computational modeling; Frequency domain analysis; Frequency estimation; Interference; Least squares approximation; Performance analysis; Time domain analysis; Channel estimation; IEEE 802.16e; OFDMA uplink; Time varying channel;
Conference_Titel :
Communications Theory Workshop, 2009. AusCTW 2009. Australian
Conference_Location :
Sydney, NSW
Print_ISBN :
978-1-4244-3356-8
Electronic_ISBN :
978-1-4244-3357-5
DOI :
10.1109/AUSCTW.2009.4805591
