Bit Error Rate Analysis of OFDM with Pilot-Assisted Channel Estimation

The objective of this paper is to develop the theoretical foundation to the pilot-assisted channel estimation using delay-time domain windowing for the coherent detection of OFDM signals. The pilotassisted channel estimation using delay-time domain windowing is jointly used with polynomial interpolation, decision feedback and Wiener filter. A closed-form BER expression is derived. The impacts of the delay-time domain window width, multipath channel decay factor, the maximum Doppler frequency are discussed. The theoretical analysis is confirmed by computer simulation. key words: OFDM, channel estimation, impulse response, polynomial interpolation, decision feedback, Wiener filter