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Beam-Space Adaptive Array Antenna for Suppressing the Doppler Spread in OFDM Mobile Reception
Pubudu Sampath WIJESENA Yoshio KARASAWA
Publication
IEICE TRANSACTIONS on Communications
Vol.E87-B
No.1
pp.20-28 Publication Date: 2004/01/01 Online ISSN:
DOI: Print ISSN: 0916-8516 Type of Manuscript: PAPER Category: Wireless Communication Technology Keyword: OFDM, Doppler spread, inter carrier interference, beam-space array antenna, maximal ratio combining,
Full Text: PDF>>
Summary:
This paper examines the Inter Carrier Interference (ICI) due to Doppler spread in OFDM mobile reception and proposes the use of Beam-Space Adaptive Array Antennas for moving receivers. In the proposed system, firstly we separate the multi-path signals into multi-beams according to their incident directions, then correct the frequency shift of each beam signal, considering the beam direction, and finally combine the corrected signals based on Maximal Ratio Combining (MRC). Further this paper clarifies the excellent performance of the proposed system in suppressing the influence of Doppler spread by carrying out computer simulation. Particularly, it was certified that it is possible to suppress the influence of the Doppler spread efficiently for all the receiving directions by using eight-element beam-space array antenna with element spacing of (3/8)λ, and referring three past symbol data when calculating the weight vector of MRC.
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