Cooperative Relay Communication Performance under Spectrum-Sharing Resource Requirements

We propose using cooperative relaying technique in spectrum-sharing systems to more effectively and efficiently use the available transmission resources, such as power, rate and bandwidth, while adhering to the spectrum-sharing resource requirements of the licensed (primary) user. Specifically, we consider that the secondary user of the spectrum is assisted by a decode-and-forward (DF) relay to help in the communication between its source and destination nodes. In this context, we obtain the end-to-end performance of the proposed spectrum-sharing cooperative relaying system in terms of the average symbol error rate (SER) of the secondary´s communication under appropriate constraints on the interference power at the primary receiver. We further analyze our theoretical results through simulations and comparisons illustrating the SER performance of the proposed spectrum-sharing cooperative system for different operating scenarios.