Doppler-Compensation for OFDM-Transmission by Sectorized Antenna Reception

Authors: P. Klenner, K.-D. Kammeyer
Abstract: Rapidly time-varying channels are a major obstacle for successful data-transmission via OFDM. The resulting loss of orthogonality among neighboring subcarriers leads to intercarrier-interference, which affects channel estimation. This in turn impedes the subsequent data detection. Literature contains numerous approaches to cope with this problem working either in time- or frequency-domain. Our concern in this paper is a novel time-domain method which relies on the use of multiple directional receive antennas. Each of these antennas experiences only a fraction of the total Doppler spread of a comparable omnidirectional antenna. This not only eases channel estimation but also allows for a diversity gain due to maximum-ratio-combining. We will demonstrate that our scheme copes well with large maximum Doppler frequencies.
Document type: Conference Paper
Publication: Herrsching, Germany, 7. - 9. May 2007
Conference: 6th International Workshop on Multi-Carrier Spread Spectrum (MCSS 07)
Index: 281
MCSS_2007_klenner.pdf168 KB
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