Cooperative Multi-Relay Resource Allocation Algorithm in Cognitive Radio Networks

Shibing Zhang, Xin Guo, Zhihua Bao, Xiaoge Zhang
2017 ICIC Express Letters  
Cognitive radio (CR) is an effective way to improve the utilization of spectrum resource. This paper focuses on the resource allocation in cooperative multi-relay cognitive radio networks and proposes a cooperative multi-relay transmission algorithm. In the algorithm, secondary users (SUs) work as the relays of a primary user (PU) to cooperate PU transmitting its data. The transmission slot is divided into two sub-slots. In the first slot, the PU chooses suitable SUs and sub-channels to relay
more » ... 's data, and then the SUs who have been chosen as the relays, select the remaining idle sub-channels to transmit their own data. In the second slot, the SUs who work as the relays forward PU's data by decode-and-forward (DF) protocol; meanwhile, all SUs who want to access the network select the remaining idle sub-channels to transmit their own data. It would accelerate the data transmission of the PU and achieve higher throughput of the CR network, especially when the channel between primary transmitter (PT) and primary receiver (PR) is weak. Simulation results show that the cooperative multi-relay would improve the throughput of the CR network obviously compared with the single relay.
doi:10.24507/icicel.11.07.1237 fatcat:zonfnttii5egdbngr37sjwvimy