QAM-OFDMシステムのブラインドチャンネル推定  [in Japanese] Blind Channel Estimation for QAM-OFDM Systems  [in Japanese]

In the present paper, a blind method is proposed to estimate QAM-OFDM channels of which transmitting and receiving stations are in line-of-sight, under the assumptions: i) the absolute value of phase rotation is less than π/2 at all sub-channels, and ii) for at least one sub-channel among them, it is less than π/4. From several simulation results for 50 sub-carriers with 16 QAM using 2048 OFDM blocks, it is confirmed that, when the SNR (Signal-to-Noise Ratio) in baseband region is over 20[dB], the QAM-OFDM channel is estimated at high precision by the proposed method and the restored symbols resulting from the channel estimates give the bit-error-rate about 10^-3 or less at SNR≥20[dB].