Cross Layer Power Allocation For Selection Relaying and Incremental Relaying Protocols Over Single Relay Networks

摘要

The purpose of this paper is analyzing and improving delay quality of service (QoS) provisioning of adaptive selection relaying protocol (SRP) and adaptive incremental relaying protocol (IRP) in single relay networks. In relation to delay QoS provisioning, the concept of effective capacity (EC) is utilized. So, as the first step, we find the EC functions of SRP and IRP and mathematically analyze the ECs to derive the closed form expressions of them which reduce the computational complexity. Then, by the goal of maximizing the ECs or equivalently improving delay QoS provisioning, we propose cross layer adaptive power allocation (APA) schemes as two closed form algorithms for both SRP and IRP strategies. The proposed cross layer APA algorithms depend on the delay QoS constraint and instantaneous channel conditions. Also, by applying the closed form ECs, two cross layer fixed power allocation (FPA) schemes are represented over both SRP and IRP that depend on delay QoS constraint and statistical channel conditions. The numerical results validate the derived closed form equations for the ECs of the protocols and also show that our proposed APA schemes achieve a significant improvement in EC performance of the system with both protocols, especially for stringent QoS requirements.