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2010
IEEE

Physical Layer for Spectrum-Aware Reconfigurable OFDM on an FPGA

10 years 10 months ago
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 subcarriers. Sets of subcarriers 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 subcarriers 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. Keywords-FPGA; OFDM; Cognitive Radio; Spectrum Sensing; Dynamic Spectrum Access
Adolfo Recio, Peter M. Athanas
Added 10 Feb 2011
Updated 10 Feb 2011
Type Journal
Year 2010
Where DSD
Authors Adolfo Recio, Peter M. Athanas
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