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On a Novel Pre-FFT OFDM Adaptive Antenna Array for Delayed Signal Suppression
Montree BUDSABATHON Shuichi HANE Yoshitaka HARA Shinsuke HARA
Publication
IEICE TRANSACTIONS on Communications
Vol.E86-B
No.6
pp.1936-1945 Publication Date: 2003/06/01 Online ISSN:
DOI: Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technology Keyword: pre-FFT OFDM, adaptive antenna array, delayed signal, maximum SNIR criterion, MMSE criterion,
Full Text: PDF>>
Summary:
It is well known that Orthogonal Frequency Division Multiplexing (OFDM) scheme is robust to frequency selective fading in wireless channels. However, once delayed signals beyond a guard interval of an OFDM symbol are introduced in a channel with large delay spread, inter-symbol interference causes a severe degradation in the transmission performance. In this paper, we propose a novel pre-Fast Fourier Transform (FFT) OFDM adaptive antenna array, which requires only one FFT processor at a receiver, for suppressing such delayed signals. We analytically derive the optimum weights for the beamformer based on the Maximum Signal-to-Noise-and-Interference power Ratio (SNIR) and the Minimum Mean Square Error (MMSE) criteria, respectively. Computer simulation results show its good performance even in a channel where Directions of Arrival (DoAs) of arriving waves are randomly determined.
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