Exploiting the cylic prefix for beamforming in OFDM receivers
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Blind and semiblind antenna array algorithms are proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems in the time domain. A blind technique is proposed for the maximization of the temporal Signal to Noise plus In- terference Ratio (SNIR) in frequency-selective channels exploiting the Cyclic Prefix (CP). In OFDM systems, this max- imization does not imply the minimization of the Bit Error Rate (BER). Thus, a semiblind method that takes advantage of both known training data and the CP is obtained, which provides the best results in terms of link quality. Simula- tions are conducted for Hiperlan/2 (HL/2) parameters, and a slight modification of its fixed pilot position is proposed, so as to improve the BER performance of the algorithms and to obtain estimates of the channel for the blind method.
CitacióPérez, A.; Bartolome, D. Exploiting the cylic prefix for beamforming in OFDM receivers. A: IX European Signal Processing Conference. "IX European Signal Processing Conference". Toulouse: 2002, p. 383-386.