Pothan, Enukonda Venkata2025-04-072025-04-072025ROLL NO.176102102https://gyan.iitg.ac.in/handle/123456789/2840Supervisor: Kashyap, SalilThe design of wireless communication networks continues to evolve in order to meet the ever-increasing requirements for higher spectral efficiency (SE) and the need to support diverse technologies, services and applications. The data rates and the number of users that can be served depend heavily on the wireless spectrum that is available. However, below 6 GHz, we do not have sufficient free spectrum available for new technologies. This has motivated spectrum regulatory bodies around the globe, for example, the Federal Communications Commission (FCC) in the USA to actively consider spectrum sharing as a potential solution to enable efficient reuse of the already allocated spectrum. In this thesis, we focus on concurrent spectrum sharing, where the cognitive user (CU) also referred to as the unlicensed user may transmit simultaneously with the incumbent primary user (PU) who owns the spectrum provided it satisfies an interference constraint. To prevent adverse impact of spectrum sharing on the primary performance, the CU must adapt its transmit power, which, in turn, limits its SE measured in bits/s/Hz.enThesis