Impact of Wi-Fi deployments and imperfect knowledge of Radar systems on Radar Wi-Fi coexistence

Abstract

Spectrum sharing between dis-similar wireless communication systems has been a focus of on-going research to provide potential solutions for the lack of spectrum availability in the current usable range. This arises from the growing usage in mobile service applications that require very high data rates. In this thesis, we examine the coexistence between wireless local area networks (WLAN) and Radars. A large amount of licensed spectrum is allocated for the use of Radars which allows for sufficient re-use of spectrum due to the spatially and temporally sporadic nature of Radar operation. We present the determination of protection regions around Radar primary users so that the aggregate interference from active Wi-Fi secondary users is kept within acceptable limits. The impact of Wi-Fi deployments - modelled as suitable random processes on the statistics of the protection region is studied. Using the Wi-Fi users, the location and mainbeam direction of the Radar is predicted. Also, a sophisticated software program to compute protection regions in the US is described.