Optimized Power Allocation Scheme for Distributed Antenna Systems with D2D Communication

Xingquan LI  Chunlong HE  Jihong ZHANG  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.5   pp.1061-1068
Publication Date: 2019/05/01
Publicized: 2018/11/21
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3005
Type of Manuscript: PAPER
Category: Terrestrial Wireless Communication/Broadcasting Technologies
distributed antenna systems,  co-located antenna systems,  D2D communication,  spectral efficiency,  energy efficiency,  power allocation,  

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In this paper, we investigate different power allocation optimization problems with interferences for distributed antenna systems (DAS) with and without D2D communication, respectively. The first objective problem is maximizing spectral efficiency (SE) of the DAS with D2D communication under the constraints of the minimum SE requirements of user equipment (UE) and D2D pair, maximum transmit power of each remote access unit (RAU) and maximum transmit power of D2D transmitter. We transform this non-convex objective function into a difference of convex functions (D.C.) then using the concave-convex procedure (CCCP) algorithm to solve the optimization problem. The second objective is maximizing energy efficiency (EE) of the DAS with D2D communication under the same constraints. We first exploit fractional programming theory to obtain the equivalent objective function of the second problem with subtract form, and then transform it into a D.C. problem and use CCCP algorithm to obtain the optimal power allocation. In each part, we summarize the corresponding optimal power allocation algorithms and also use similar method to obtain optimal solutions of the same optimization problems in DAS. Simulation results are provided to demonstrate the effectiveness of the designed power allocation algorithms and illustrate the SE and EE of the DAS by using D2D communication are much better than DAS without D2D communication.