Effective capacity analysis in underlay cooperative cognitive radio network

Based on statistical delay quality of service (QoS) constraints, effective capacity in underlay cooperative cognitive radio network is investigated. Distinct from other researches, the cooperative transmission takes both direct link and relay link of secondary user into account. The secondary receiver merges the signals from the two links to obtain diversity gain and transmission reliability. Under the statistical delay QoS constraints, the paper obtains the maximum arrival-rate supported by the secondary user´s cooperative links, and derives a closed-form expression of effective capacity. Finally, simulations are made to verify the performance of theoretical analysis.