An Adaptive Antenna Using Orthogonal Projection for OFDM Transmission

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Kihira, Kazunari; Ohtsuka, Masataka; Konishi, Yoshihiko (Information Technology R&D Center, Mitsubishi Electric Corporation, 5-1-1 Ofuna, Kamakura-shi 247-8501, JAPAN)

OFDM systems are known to outperform singlecarrier systems in a multipath environment. However, multipath waves, whose delay times are longer than the guard interval, cause intersymbol interference, because of which the performance of the system degrades. The effectiveness of adaptive arrays in overcoming this problem has been investigated. This paper proposes the use of an adaptive array with orthogonal projection for OFDM transmission with zero carriers. In the proposed method, the projection matrix is calculated from the zero carriers including the interference wave, and the matrix is used to suppress the undersired waves. Then, maximal-ratio combining is performed in each subcarrier. Simulation results show that the proposed method effectively suppresses undesired waves.