Beam-space adaptive array antenna for suppressing the Doppler spread in OFDM mobile reception

摘要

This paper examines the Inter Channel Interference (ICI) due to Doppler spread in OFDM mobile reception and has proposed to use Beam-Space Adaptive Array Antennas as the moving receiver. In the proposed system, first separate the multi-path signals into multi-beams by the degree of their Doppler frequency shift, then correct the frequency shift considering their beam directions, and finally combine the corrected signals using Maximal Ratio Combiner (MRC). Further this paper has clarified the excellent performance of the proposed system in suppressing influence of Doppler spread by carrying out computer simulation. Particularly, it was certified that it is possible to receive and 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.