NDLI: Spectral spatial equalization for OFDM in time-varying frequency-selective multipath channels

Content Provider	IEEE Xplore Digital Library
Author	Sanghoon Sung Brady, D.
Copyright Year	2000
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA (Sanghoon Sung)
Abstract	Orthogonal frequency division multiplex (OFDM) transmission over a time-variant frequency-selective multipath fading channel suffers from significant attenuation on faded frequency regions as well as inter-channel interference (ICI) due to the loss of subchannel orthogonality. To mitigate signal fading and ICI, we introduce a frequency-space domain equalization (FSDE) using an antenna array. Unlike conventional combining diversity or selection diversity, this scheme differs in that it attempts to prevent the occurrence of the frequency-selective fading and ICI rather than compensates for them. A FSDE on the received OFDM signal is performed by space-time Fourier transform (STFT) and frequency-domain equalization (FDE). While a time-domain Fourier transform in STFT demodulates OFDM signals, a space-domain Fourier transform attenuates the OFDM signals arriving at the antenna array through unwanted paths. This approach includes the blind estimation of the direction-of-arrival (DOA) for the multiple paths by employing the cyclostationarity of the OFDM signal. A FDE is applied to the output of the STFT to compensate for the effect of the remaining ICI. The effectiveness of FSDE is examined in terms of the resulting frequency-selective fading, ICI and SINR gain.
Starting Page	434
Ending Page	438
File Size	393559
Page Count	5
File Format	PDF
ISBN	0780363396
DOI	10.1109/SAM.2000.878046
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-03-17
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	OFDM Fading Diversity reception Fourier transforms Antenna arrays Frequency division multiplexing Attenuation Interchannel interference Propagation losses Frequency diversity
Content Type	Text
Resource Type	Article

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