Implementation of OFDM baseband transceiver with dynamic spectrum access for cognitive radio systems

Authors:
Ryoji Hashimoto;Toshimitsu Tatsuka;Masahide Hatanaka;Takao Onoye;Hironobu Hatamoto;Shinsuke Ibi;Sinichi Miyamoto;Seiichi Sampei
Affiliations:
Dept. Information Systems Engineering, Osaka University;Dept. Information Systems Engineering, Osaka University;Dept. Information Systems Engineering, Osaka University;Dept. Information Systems Engineering, Osaka University;Dept. Electrical, Electronic, and Information Engineering, Osaka University;Dept. Electrical, Electronic, and Information Engineering, Osaka University;Dept. Electrical, Electronic, and Information Engineering, Osaka University;Dept. Electrical, Electronic, and Information Engineering, Osaka University
Venue:
ISCIT'09 Proceedings of the 9th international conference on Communications and information technologies
Year:
2009

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Abstract

VLSI architecture for OFDM baseband transceiver is developed, which is dedicated to cognitive radio systems. To facilitate dynamic spectrum access, this transceiver architecture employs a specialized FFT/IFFT module and a mapping/demapping module. Efficient mechanisms to omit input/ output of unused subcarriers are introduced. Also, calculation of spectrum intensity for subcarrier level carrier sensing is successfully integrated to the FFT module. Whole transmitter/ receiver modules are implemented by keeping compatibility with IEEE 802.11g. A prototype system is constructed by using Xilinx Virtex-II FPGA, which can transmit video sequence in real time.