New Channel Estimation Exploiting Reliable Decision-Feedback Symbols for OFDM Systems

The conventional pilot-aided orthogonal frequency division multiplexing (OFDM) systems use the fixed number of pilots to estimate the channel. In this paper, we propose a new channel estimation scheme that exploits reliable decision-feeback symbols in the OFDM systems. The reliable symbols having low symbol error rate can be used to refine the channel estimate again. The resultant algorithm gives a more accurate channel estimate and lower bit error rate (BER) than the conventional method. The analysis of Cramér Rao lower bound (CRLB) and simulation results verify our claims that the enhanced channel estimation and lower BER can be achieved.