Resource allocation for relay assisted cognitive radio networks

In this paper, we present two optimal resource allocation schemes that maximize throughput and symbol correct rate (SCR). The throughput and SCR are derived. The derived throughput and SCR are optimized with respect to the sensing time, the source transmission power and the relay transmission power. Numerical results show that the optimal sensing time is dependent on the primary user´s signal-to-noise-ratio (SNR). They also show that SCR increases with increase in the number of relays.