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Joint Resource Allocation for Lifetime-aware Cooperative Multi-carrier DF System

International Journal of Automation and computing 2014年第1期11卷 87-92页

作者： Chao-Ping Guo Kun Han Xiao-Long Zhang Hai-Lin Zhang State Key Laboratory of Integrated Services Network Xidian University Xi'an Communication Institute

In this paper,we study the problem of optimal resource allocation for lifetime maximization in an orthogonal-frequencydivision multiplexing(OFDM)system with decode-and-forward *** goal is to minimize total energy cost of the system by jointly optimizing power allocation,subcarrier pairing and relay *** present a heuristic solution that is composed of two *** first part is an optimal power allocation approach to allocate power to a subcarrier pair of the source and the *** second part is a modified Hungarian algorithm to make subcarrier pairing and relay *** show that the presented scheme outperforms other schemes in the total transmitted data and the network lifetime.

关键词： Cooperative communications resource allocation decode-and-forward orthogonal-frequency-division multiplexing(OFDM) subcarrier pairing power allocation relay selection

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Energy efficiency based multi-relay selection and power allocation in OFDM cooperation networks

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The Journal of China Universities of Posts and Telecommunications 2014年第3期21卷 10-17页

作者： WANG Rui JI Hong LI Xi Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications

Getting along with the improvement of green communications, the energy efficiency （EE） of wireless network becomes more and more important. However, in nmlti-relay-assisted systems, the related work obviously depends on the end-to-end performance, whereas EE of relays has not attracted enough attention. The authors propose an orthogonal frequency division multiplexing （OFDM） multi-relay system based on amplify and forward （AF） mode. Taking incorporating EE and remaining energy as factor, decision criteria of attending cooperation is designed. The EE based asynchronous power iteration method is presented, and the existence and convergence of nash equilibrium （NE） is proven. Furthermore, a joint algorithm in subcarrier pairing, relay selection and power allocation is given. Genetic algorithm （GA） and iteration method are integrated to improve the convergence speed additionally. Simulation demonstrates the obvious improvement of EE, decrease of power consumption and increase of lifetime in relays of this algorithm with the constraint of minimum data transmission rate.

关键词： EE OFDM Multi-relay selection power allocation subcarrier pairing

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维普期刊数据库

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A novel resource optimization scheme for multi-cell OFDMA relay network

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Frontiers of Information Technology & Electronic Engineering 2016年第8期17卷 825-833页

作者： Ning DU Fa-sheng LIU College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao 266590 China Department of Mathematics and Information Engineering Dongchang College of Liaocheng University Liaocheng 252000 China

In cellular networks, users communicate with each other through their respective base stations（BSs）.Conventionally, users are assumed to be in different cells. BSs serve as decode-and-forward（DF） relay nodes to *** addition to this type of conventional user, we recognize that there are scenarios users who want to communicate with each other are located in the same cell. This gives rise to the scenario of intra-cell communication. In this case, a BS can behave as a two-way relay to achieve information exchange instead of using conventional DF *** consider a multi-cell orthogonal frequency division multiple access（OFDMA） network that comprises these two types of users. We are interested in resource allocation between them. Specifically, we jointly optimize subcarrier assignment, subcarrier pairing, and power allocation to maximize the weighted sum rate. We consider the resource allocation problem at BSs when the end users＇ power is fixed. We solve the problem approximately through Lagrange dual decomposition. Simulation results show that the proposed schemes outperform other existing schemes.

关键词： Intra-cell communication Two-way relay subcarrier assignment subcarrier pairing

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