A new flexible channel access scheme using overlap FFT filter-bank for dynamic spectrum access

Authors:
Motohiro Tanabe;Masahiro Umehira;Koichi Ishihara;Yasushi Takatori
Affiliations:
Graduate School of Science and Engineering, Ibaraki University, Hitachi-shi, Ibaraki, Japan;Graduate School of Science and Engineering, Ibaraki University, Hitachi-shi, Ibaraki, Japan;NTT Network Innovation Laboratories, Yokosuka-shi, Kanagawa, Japan;NTT Network Innovation Laboratories, Yokosuka-shi, Kanagawa, Japan
Venue:
APCC'09 Proceedings of the 15th Asia-Pacific conference on Communications
Year:
2009

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Abstract

An OFDMA based channel acces scheme is proposed for dynamic spectrum access to utilize frequency spectrum efficiently. However, the OFDMA signal has large PAPER (Peak to Average Power Ratio). In addition, if the OFDMA receiver does not use filter(s) to extract block(s) of sub-carriers before FFT(Fast Fourier Transform), the designated sub-carriers suffer large ACI (Adjacent Channel Interefrence) in the FFT processing. To solve these problems of PAPR and ACI, this paper proposes a new flexible channel access sheme using overlap FFT filter-bank based on single carrier modulation for dynamic spectrum access. It also evaluates the performance by computer simulation.