CNCS Center for Nonlinear and Complex Systems
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Publications [#330754] of David J. Brady

Papers Published

  1. Sung, S; Brady, D, Spectral spatial equalization for OFDM in time-varying frequency-selective multipath channels, Proceedings of the Ieee Sensor Array and Multichannel Signal Processing Workshop, vol. 2000-January (January, 2000), pp. 434-438, IEEE, ISBN 0780363396 [doi]
    (last updated on 2019/11/17)

    Abstract:
    © 2000 IEEE. 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.