Sum-rate analysis of the two-way relay channel in spectrum-sharing environments

This paper examines the two-way relay channel (TWRC) in a spectrum-sharing environment. Two secondary users, a primary user and a relay are the involved nodes in our model. The transmit power of the secondary users and the relay are adapted optimally to approach the maximum achievable sum-rate while keeping the interference level at the primary user below a threshold. Numerical simulations are conducted to demonstrate the performance of the proposed scenario.