Channel estimation techniques with long training sequence for IEEE802.11A

We compare and evaluate the channel estimation schemes for IEEE802.11a and present their performance for different SNRs. Time-domain truncation approach for the channel estimation is considered for the fact that the taps with least energy degrade the performance as they become more noisy in low SNR conditions. In the paper, the problem formulation is based on the PLCP preamble of IEEE802.11a in which the long preamble sequence consists of only +1 or -1 or 0. Three popular techniques of equalization, Per-tone, least squares (LS), and minimum mean square error (MMSE) are compared in their performance for various SNR conditions.