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CrossLayer Optimal Power Allocation Scheme for TwoWay Relaying System with AmplifyandForward Policy
Hui ZHI Yukun ZHA Xiaotong FANG
Publication
IEICE TRANSACTIONS on Communications
Vol.E102B
No.8
pp.17411750 Publication Date: 2019/08/01
Online ISSN: 17451345
DOI: 10.1587/transcom.2019EBP3001
Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: twoway relaying, amplifyandforward, crosslayer power allocation, effective capacity,
Full Text: PDF>>
Summary:
A novel adaptive crosslayer optimal power allocation (OPA) scheme over physical layer and datalink layer for twoway relaying system with amplifyandforward policy (TWRAF) is proposed in this paper. Our goal is to find the optimal power allocation factors under each channel state information (CSI) to maximize the sum throughput of two sources under total transmit power constraint in the physical layer while guaranteeing the statistical delay qualityofservice (QoS) requirement in the datalink layer. By integrating information theory with the concept of effective capacity, the OPA problem is formulated into an optimization problem to maximize the sum effective capacity. It is solved through Lagrange multiplier approach, and the optimal power allocation factors are presented. Simulations are developed and the results show that the proposed crosslayer OPA scheme can achieve the best sum effective capacity with relatively low complexity when compared with other schemes. In addition, the proposed crosslayer OPA scheme achieves the maximal sum effective capacity when the relay is located in (or near) the middle of the two source nodes, and the sum effective capacity becomes smaller when the difference between two QoS exponents becomes larger.

