Systematic design of single carrier overlap frequency domain equalization |
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Authors: | Wladimir Bocquet Kazunori Hayashi Hideaki Sakai |
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Institution: | (1) Department of Electrical & Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA |
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Abstract: | This paper proposes a systematic design method of overlap frequency domain equalization (FDE) for single carrier (SC) transmission
without a guard interval (GI). Based on the analysis of signal-to-interference-plus-noise ratio (SINR) of the equalizer output
for each symbol, the authors adaptively determine the block of the overlap FDE, where the block is defined as a set of symbols
at the equalizer output with sufficiently low error rate, for a certain fixed sliding window size, which corresponds to a
fast Fourier transform (FFT) window size. The proposed method takes advantage of the fact that the utility part of the equalized
signal is localized around the center of the FFT window. In addition, the authors also propose to adjust the block size in
order to control the computational complexity of the equalization per processed sample associating with the average bit error
rate (BER) of the system. Simulation results show that the proposed scheme can achieve comparable BER performance to the conventional
SC-FDE scheme with sufficient GI insertion for both the coded and uncoded cases with various modulation levels, while requiring
lower computational complexity compared to the SC overlap FDE transmission with the fixed block. |
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Keywords: | |
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