This paper addresses two important issues in channel estimation for OFDM system: the selection of the pilot tones and the interpolation methods. We first obtain the minimum number and the optimal position sets of the pilot tones, and the MSE bound of the channel estimation. Then two special schemes of channel estimate for IEEE802.11a WLAN system are proposed, which are named as LS method and interpolation method. We compare the performance by measuring MSE of the channel estimate and BER with BPSK, QPSK and 16QAM as uncoded OFDM modulations. The simulation results show that these two proposed schemes are pretty good especially for interpolation method. The MSE of these estimations are close to the bound, and the BER performance of uncoded system is very close to the case with known channel response.
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