Summary
International Symposium on Antennas and Propagation
2006
Session Number:3A2a
Session:
Number:3A2a-5
Robust Beamforming Method for Frequency Offsets in Uplink Multiuser OFDM-MIMO
Yasushi Takatori, Riichi Kudo, Atsushi Ohta, Koichi Ishihara, Kentaro Nishimori, Shuji Kubota,
pp.1-4
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
In uplink MU-MIMO systems, different frequency offsets among multiple mobile stations (MSs) significantly degrade the transmission quality especially when orthogonal frequency division multiplexing (OFDM) is used. In this paper, the influence of the frequency offset is analyzed in a frequency selective fading environment. Moreover, a new beamforming method is proposed to compensate for the frequency offset by introducing an auto frequency controller after the space-frequency equalization in each data stream. The effect of the proposed method is evaluated in a frequency selective fading environment by computer simulation.