Incremental Pragmatic Distribution Algorithm for Cooperative Cognitive Radio Network

Abstract

CooperativeCooperative communication in cognitive radio networks (CRNs) is an emerging communication prototype which offers enhanced reachability and improved capacity. In such mode of communication, the Cognitive Users (CUs) can work as relay nodes for conveying the signal received from the Primary Users (PUs) to required destinations, while satisfying the PUs’ and the CUs’ minimum rate requirements. The PUs’ are motivated to cooperate by the incentive to attain a higher PU rate with low power requirement, while concurrently allowing an access to CUs to share their spectral band. This arrangement is usually called as Overlay CRN. Several schemes are available in the literature which provide efficient spectral access for multiple PUs and CUs in cooperative CRNs. However, in such schemes the PUs enhanced performance does not necessarily translates into a satisfactory performance for the CUs and vice versa. Existing cooperative distribution algorithms such as Pragmatic Distribution Algorithms (PDA) and Conventional Distribution Algorithms (CDA) do not support the transmission rate enhancement for both PUs and CUs simultaneously and an improved performance of one network (PUs or CUs) results into poor performance of the other. In this paper, an improved algorithm namely ‘Incremental Pragmatic Distribution Algorithm (IPDA)’ is proposed, which attempts to improve the average transmission rate of both CUs and PUs.