2-D channel estimation of OFDM systems over time-varying channel

2-D channel estimation of an OFDM system over time-varying channel is investigated in this paper using the Wiener filter. In order to model time-varying channel Clarke’s model is implemented. All the sub-carriers are not required in OFDM systems for channel estimation. The performance of channel estimator can profit from strong frequency correlations and quite strong time correlations when pilot symbols are spaced at interval in frequency and time respectively. Simulation results show that the 2-D channel estimator has better performance as the 1-D channel estimator using the same number of pilots.

Keywords:

2-D channel estimation , OFDM system , wiener filter