Abstract: In recent years dynamic spectrum sharing (DSS) has emerged as a key technique for increasing the radio spectrum utilization by accommodating unlicensed devices (UDs) on underutilized licensed (primary) frequencies. The first authorised application of DSS is specified in recent regulations issued by the Federal Communications Commission (FCC) for operation of UDs on DTV channels. The FCC regulations implement interference control from co-channel UDs by a UD exclusive region (protection region) around the primary system. However, the FCC regulations consider interference to DTV receivers from a single UD only. We extend the FCC model by considering aggregate interference from multiple randomly located UDs and develop analytical techniques for determining the required protection regions. We also analyse the feasibility of operation of multiple WLAN hotspots on adjacent channels inside the DTV service contour. We analyse the capacity of an unlicensed system operating under constraints imposed by the DTV system performance requirements, determining the optimal operational conditions for which the maximum capacity is obtained. The analysis of the aggregate interference at DTV receivers and the capacity of the unlicensed system for realistic system parameter values provides information directly relevant to system planners.
Biography: Rachita Dahama is currently pursuing a PhD degree at the University of Auckland, New Zealand. She received her BE degree in Electrical and Electronic Engineering from the University of Auckland in 2007. Her current research interests include interference management techniques for spectrum sharing systems, statistical interference modelling and the application of the statistical interference models to extend the regulations issued by spectrum regulatory bodies for the operation of unlicensed systems on DTV channels.