Proceedings ArticleDOI
Energy- and Spectral-Efficiency Tradeoff in Downlink OFDMA Networks
Cong Xiong,Geoffrey Ye Li,Shunqing Zhang,Yan Chen,Shugong Xu +4 more
- pp 1-5
TLDR
The fundamental tradeoff between energy efficiency (EE) and SE in downlink orthogonal frequency division multiple access (OFDMA) networks is addressed and a low-complexity but near-optimal resource allocation algorithm is developed for practical application of the EE-SE tradeoff.Abstract:
Conventional design of wireless networks mainly focuses on system capacity and spectral efficiency (SE). As green radio (GR) becomes an inevitable trend, energy-efficient design in wireless networks is becoming more and more important. In this paper, the fundamental tradeoff relation between energy efficiency (EE) and SE in downlink orthogonal frequency division multiple access (OFDMA) networks is addressed. We obtain a tight upper bound and lower bound on the optimal EE-SE tradeoff relation for general scenarios based on Lagrange dual decomposition, which accurately reflects the optimal EE-SE tradeoff relation. We then focus on a special case that priority and fairness are considered and derive an alternative upper bound, which is even proved to be achievable for flat fading channels. We also develop a low-complexity but near-optimal resource allocation algorithm for practical application of EE-SE tradeoff. Numerical results demonstrate that the optimal EE-SE tradeoff relation is a bell shape curve and can be well approached with our resource allocation algorithm.read more
Citations
More filters
Journal ArticleDOI
Fundamental Green Tradeoffs: Progresses, Challenges, and Impacts on 5G Networks
TL;DR: This paper provides a comprehensive overview on the extensive on-going research efforts and categorize them based on the fundamental green tradeoffs and focuses on research progresses of 4G and 5G communications, such as orthogonal frequency division multiplexing and non-orthogonal aggregation, multiple input multiple output, and heterogeneous networks.
Journal ArticleDOI
Energy- and Spectral-Efficiency Tradeoff for Distributed Antenna Systems with Proportional Fairness
TL;DR: This paper proposes an EE scheme with proportional fairness for the downlink multiuser distributed antenna systems (DAS) and exploits multi-criteria optimization method to systematically investigate the relationship between EE and spectral efficiency (SE).
Journal ArticleDOI
Recent Advances in Underlay Heterogeneous Networks: Interference Control, Resource Allocation, and Self-Organization
TL;DR: The potential open issues for underlay HetNets to improve SE and EE when combining with energy harvesting and cloud computing are outlined.
Journal ArticleDOI
Energy Efficiency and Spectrum Efficiency of Multihop Device-to-Device Communications Underlaying Cellular Networks
TL;DR: The average energy efficiency and spectral efficiency of multihop D2D communications under Rayleigh fading channels are analyzed and close analytical approximations based on Taylor series expansion are provided.
Journal ArticleDOI
A Survey of Energy Efficient Resource Management Techniques for Multicell Cellular Networks
Jaya Rao,Abraham O. Fapojuwo +1 more
TL;DR: This paper surveys the recent findings in the area of energy efficient radio resource management in cellular networks and identifies the key techniques that have the highest energy saving potential to be developed in the context of Green Networks while serving as a guideline for future research endeavours.
References
More filters
Journal ArticleDOI
Multiuser OFDM with adaptive subcarrier, bit, and power allocation
TL;DR: The results show that the proposed algorithm outperforms multiuser OFDM systems with static time-division multiple access (TDMA) or frequency-divisionmultiple access (FDMA) techniques which employ fixed and predetermined time-slot or subcarrier allocation schemes.
Journal ArticleDOI
Energy-efficiency of MIMO and cooperative MIMO techniques in sensor networks
TL;DR: This work considers radio applications in sensor networks, where the nodes operate on batteries so that energy consumption must be minimized, while satisfying given throughput and delay requirements, and analyses the best modulation and transmission strategy to minimize the total energy consumption.
Journal ArticleDOI
Dual methods for nonconvex spectrum optimization of multicarrier systems
TL;DR: It is shown that under a certain condition called the time-sharing condition, the duality gap of the optimization problem is always zero, regardless of the convexity of the objective function, which leads to efficient numerical algorithms that solve the nonconvex problem in the dual domain.
Proceedings ArticleDOI
Increase in capacity of multiuser OFDM system using dynamic subchannel allocation
Wonjong Rhee,John M. Cioffi +1 more
TL;DR: A multiuser convex optimization problem is derived to find the optimal allocation of subchannels, and a low-complexity adaptive subchannel allocation algorithm is proposed that performs almost as well as the optimal solution.
Journal ArticleDOI
Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints
TL;DR: A set of proportional fairness constraints is imposed to assure that each user can achieve a required data rate, as in a system with quality of service guarantees, and a low-complexity suboptimal algorithm that separates subchannel allocation and power allocation is proposed.