Abstract
This paper is aiming at solving a joint optimization of transmit powers (TPs) and transmit time (TT) allocation problem. The joint optimization problem needs to consider nonideal power amplifiers (PAs) efficiency, non-negligible circuit powers (CPs) consumption and direct links (DLs) in relaying transmission (RT) simultaneously. Firstly, transmission models, spectral-efficiency (SE) analysis, and total energy consumption (TEC) models with the existence of DLs in RT are given. Secondly, minimizing TEC analysis with joint optimization of TPs and TT under non-negligible CPs consumption and nonideal PAs efficiency is given. In addition, the gradient-descent algorithm which is used to solve the joint optimization problem is given. Furthermore, optimal relay position (ORP) problems are analyzed. Simulations are presented to validate the theoretical analysis. Results reveal that the relay technique and DLs in RT can improve the system's SE and energy-efficiency (EE).
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