Implementation of interface agility for duplex dynamic spectrum access radio using USRP

Abstract

Dynamic Spectrum Access (DSA) based Cognitive Radio (CR) allows a secondary user (SU) to use spectrum in an opportunistic manner when the primary user (PU) of that spectrum is not transmitting. Conventional dynamic spectrum allocation methods deal with acquiring spectrum as fixed width channels. In this paper, we propose a novel technique where a node inside a network can dynamically access the spectrum of any width. We also show that a node can create multiple virtual interfaces to communicate with multiple neighbors simultaneously. With a prototype built with off-the-shelf software defined radio, we indicate that a node can achieve duplex communication with multiple neighbors utilizing a single transceiver.