Physical Layer for Spectrum-Aware Reconfigurable OFDM on an FPGA

Orthogonal Frequency Division Multiplexing (OFDM) can provide a flexible usage of the spectrum by controlling individual sub carriers. Sets of sub carriers can be zero-modulated to avoid interfering narrowband primary users, making OFDM a strong candidate for Cognitive Radio implementations. This pa...

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Bibliographic Details
Published in2010 13th Euromicro Conference on Digital System Design: Architectures, Methods and Tools pp. 321 - 327
Main Authors Recio, Adolfo, Athanas, Peter
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2010
Subjects
Channel estimation
Cognitive Radio
Correlation
Dynamic Spectrum Access
FPGA
Modulation
OFDM
Receivers
Resource management
Spectrum Sensing
Transmitters
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Summary:Orthogonal Frequency Division Multiplexing (OFDM) can provide a flexible usage of the spectrum by controlling individual sub carriers. Sets of sub carriers can be zero-modulated to avoid interfering narrowband primary users, making OFDM a strong candidate for Cognitive Radio implementations. This paper presents the design and implementation of a non-contiguous OFDM physical layer (PHY) capable of supporting arbitrary allocation vectors and spectrum sensing for cognitive radio applications. Least squares methods applied on an arbitrary set of pilot sub carriers are used to estimate and track the phase errors caused by residual carrier frequency offset and by non-ideal sampling frequency at the receiver. A full FPGA prototype was developed and evaluated using Virtex-4 devices, including over-the-air testing in the 2.05 GHz radio band.
ISBN:9781424478392
1424478391
DOI:10.1109/DSD.2010.110