A Novel OFDMA Cellular System Based on Multiple FrFT Angles Reuse Scheme

Authors:
Huiqi Wang;Wangyong Lv;Wensimi Bai;Hong Ma
Affiliations:
College of Mathematics, Sichuan University, Chengdu, China 610064;College of Mathematics and Software Science, Sichuan Normal University, Chengdu, China 610068;College of Mathematics, Sichuan University, Chengdu, China 610064;College of Mathematics, Sichuan University, Chengdu, China 610064
Venue:
Wireless Personal Communications: An International Journal
Year:
2012

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Abstract

In conventional Orthogonal Frequency Division Multiple Access (OFDMA) cellular systems, the fundamental cause of inter-cell interference (ICI) is that the signals from serving Base Station (BS) and interference BSs, are modulated by same exponential bases, at same subcarrier. In this letter, an effective OFDMA cellular mobile system based on multiple fractional Fourier transform (FrFT) angle reuse scheme is proposed. In this system, FrFT angle is regarded as new resource, which can be optimally allocated to each BS of cellular system. Because chirp bases, generated by different FrFT with optimally allocated angle, are mutually approximately orthogonal at same subcarrier, ICI can be perfectly suppressed. Both theory and simulations show the essential advantages over conventional OFDMA cellular systems for ICI suppression and bit error rate.