Intentional-overlapping for multicarrier schemes based on user-specific filters

Authors:
Z. Esad Ankaralı;Alphan Şahin;Hüseyin Arslan
Affiliations:
Department of Electrical Engineering, University of South Florida, Tampa, USA 33620;Department of Electrical Engineering, University of South Florida, Tampa, USA 33620;Department of Electrical Engineering, University of South Florida, Tampa, USA 33620
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2014

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Abstract

In this study, we introduce controlled overlapping in time and frequency between neighboring symbols in multicarrier schemes to increase spectral efficiency. Conventionally, multicarrier schemes are designed based on Nyquist criterion to avoid inter-carrier interference and inter-symbol interference. Also, the time---frequency lattice and the prototype filter are designed considering the worst-case of time-varying multipath channel. However, this approach ignores to make use of multi-user diversity and leads excessive spacings between successive symbols in time and frequency. Unlike the conventional methods, in this study, symbols are allowed to be overlapped (depending on time---frequency dispersion of their individual channels) as long as the signal-to-interference ratios observed by all users are kept above a certain level. Additionally, in order to achieve more flexibility in packing symbols, user specific filters that have different time---frequency characteristics are utilized. This enables further spectral efficiency improvement in our system design.