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Energy-Efficient Joint User Association and power allocation in Relay-Aided Massive MIMO Systems

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Journal of Communications and Information Networks 2018年第2期3卷 58-65页

作者： Jing Chen Hongbin Chen Feng Zhao Key Laboratory of Cognitive Radio and Information Processing Guilin University of Electronic TechnologyGuilin 541004China

Energy efficiency is an important metric for downlink transmission in an amplify-and-forward relay-aided massive multiple-input multiple-output system,but has not been well *** this work,considering the characteristics of such a system and quality-of-service requirements of users,the energy-efficient joint user asso-ciation and power allocation problem is ***,the closed-form expression of system energy efficiency under the proportional fairness criterion is ***,the proportionally fair utility of system energy efficiency is maximized under constraints of minimum signal-to-noise ratio requirements of users and maximum transmit powers of the base station(BS)and relay *** it is difficult to solve this optimization problem directly due to its mixed-integer and non-convex features,the original problem is decomposed into a user association sub-problem and a power allocation *** the former,optimum user association is determined by solving a Lagrangian dual problem with a sub-gradient algorithm;for the latter,optimum transmit powers of the BS and each relay station are determined by using Newton’s ***,a sub-optimal solution of the original problem is obtained by a low-complexity iterative *** results show that the proposed joint user association and power allocation algorithm can offload the traffic of the BS effectively,keep the BS and relay stations operate at low power levels,and improve the system energy efficiency significantly,compared with user association-only schemes.

关键词： massive MIMO relay energy efficiency user association power allocation

Optimal power allocation for downlink two-user non-orthogonal multiple access in visible light communication

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Journal of Communications and Information Networks 2017年第4期2卷 57-64页

作者： Hong Shen Yanfei Wu Wei Xu Chunming Zhao National Mobile Communications Research Laboratory Southeast UniversityNanjing 210096China

In this work,we consider employing the NOMA(Non-Orthogonal Multiple Access)technique in downlink VLC(Visible Light Communication)for performance *** particular,focusing on a typical NOMA scenario with two users,we optimize the power allocation strategies under both sum-rate maximization and max-min fairness criteria,where practical optical power and QoS(Quality of Service)constraints are *** our main contribution,we achieve optimal power allocation solutions in semi-closed forms via mathematical analysis,which,to the best of our knowledge,have not been reported in *** results demonstrate that NOMA can provide remarkable performance gains over OMA(Orthogonal Multiple Access)in the context of VLC downlinks.

关键词： NOMA VLC power allocation sum-rate maximization max-min fairness

A Joint power and Bandwidth allocation Method Based on Deep Reinforcement Learning for V2V Communications in 5G

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China Communications 2021年第7期18卷 25-35页

作者： Xin Hu Sujie Xu Libing Wang Yin Wang Zhijun Liu Lexi Xu You Li Weidong Wang School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China China Unicom Research Institute Beijing 100032China Department of Geomatics Engineering University of CalgaryAB T2N 1N4Canada

Vehicular communications have recently attracted great interest due to their potential to improve the intelligence of the transportation *** maintaining the high reliability and low latency in the vehicle-to-vehicle(V2V)links as well as large capacity in the vehicle-to-infrastructure(V2I)links,it is essential to flexibility allocate the radio resource to satisfy the different requirements in the V2V *** paper proposes a new radio resources allocation system for V2V communications based on the proximal strategy optimization *** this radio resources allocation framework,a vehicle or V2V link that is designed as an *** through interacting with the environment,it can learn the optimal policy based on the strategy gradient and make the decision to select the optimal sub-band and the transmitted power *** the proposed method can output continuous actions and multi-dimensional actions,it greatly reduces the implementation complexity of large-scale communication *** simulation results indicate that the allocation method proposed in this paper can meet the latency constraints and the requested capacity of V2V links under the premise of minimizing the interference to vehicle-to-infrastructure communications.

关键词： 5G V2V communication power allocation bandwidth allocation deep reinforcement learning

Joint power and spectrum allocation in multi-hop cognitive radio networks

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The Journal of China Universities of Posts and Telecommunications 2014年第2期21卷 9-14页

作者： WU Jing LI Yi LIU Gang JI Hong School of Telecommunication Engineering Beijing University of Posts and Telecommunications

Various cognitive network technologies are developed rapidly. In the article, the power and spectrum allocation in multi-hop cognitive radio network （CRN） with linear topology is investigated. The overall goal is to minimize outage probability and promote spectrum utility, including total reward and fairness, while meeting the limits of total transmit power and interference threshold to primary user simultaneously. The problem is solved with convex optimization and artificial bee colony （ABC） algorithm jointly. Simulation shows that the proposed scheme not only minimizes outage probability, but also realizes a better use of spectrum.

关键词： cognitive radio power allocation outage probability spectrum utility ABC algorithm

Distributed Dynamic power allocation Strategy Based on Energy Balance in Wireless Sensor Networks for Smart Grid

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Distributed Dynamic Power Allocation Strategy Based on Energ...

作者： Gang SHAO Wen-qin WU Lei YIN Chen-yang DING Xiao-yuan ZHANG State Grid Chongqing Electric power Company Nan'an power Supply Branch State Grid Corporation of China NARI Group Corporation(State Grid Electric power Research Institute)

The characteristics of wireless sensor networks can solve many problems in smart grid construction. The power allocation strategy can effectively improve the energy efficiency of wireless sensor networks, but the static strategy will lead to unbalanced network energy consumption. So we construct a function of the energy condition of the reaction node. The transmission power of nodes is changed dynamically through the exchanging of information between neighbor nodes. And a distributed dynamic power allocation strategy based on energy balance is proposed. Simulation results show that it can effectively prolong the overall survival time of the network. This method can be used in a power system private network.

关键词： Wireless sensor networks power allocation Energy balance Survival time

Optimizing Multiuser Multimedia Transmission Through power allocation in SLNR-precoding-based MISO Downlink Systems

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Optimizing Multiuser Multimedia Transmission Through Power A...

2012 IEEE 14th International Conference on Communication Technology

作者： Kai Zhao Haixia Zhang Dongfeng Yuan Wireless Mobile Communication and Transmission Lab.School of Information Science and Engineering Shandong University

ISBN: (纸本)9781467321006

Transmission of the multimedia video streaming has been an important topic in wireless *** a metric of video quality at the application layer,peak signal-to-noise ratio （PSNR） is affected by the capacity at the physical layer which can be improved by power controlling and *** paper investigates an optimal power allocation scheme which can maximize the sum PSNR of all users in an SLNR-precoding- based multiuser multiple input single output （MISO） *** power allocation problem can be transformed into a convex optimization problem when the system works in the high signal to interference plus noise ratio （SINR） *** of the proposed power allocation scheme is evaluated through computer *** show that,when the system works in the high SINR region,performance improvement in terms of sum PSNR through power allocation is neglectable while the effects of different precoding schemes on the sum PSNR performance are obvious.

关键词： power allocation signal to leakage noise ratio (SLNR) precoding multiuser multimedia transmission.

Study on MIMO Precoder and power allocation Based on BD for Fairness

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Study on MIMO Precoder and Power Allocation Based on BD for ...

2011 IEEE International Conference on Information Theory and Information Security(ICITIS 2011)

作者： Liguo Zhao Department of Computer and Information Engineering Luoyang Institute of Science and Technology Luoyang China

A joint linear precoding and power allocation algorithm based on users’ QoS is proposed for the downlink of multiuser MIMO systems. This algorithm will improve the channel capacity of the multiuser MIMO system and guarantee different user’s QoS requirement at the same time. The complex problem is simplified and decomposed into three separate steps. First, transmit precoding is computed based on block diagonalization. Second, power matched with least rate requirement each user is allocated. Last, remained power is divided for all over the users in method named filling water. The simulation result shows that it will not only cancel CCI, but also but also meet the users’service requirement compared with the other schemes at the cost of little capacity lost.

关键词： multiuser MIMO Precoding power allocation QoS

Relay Selection and power allocation for Spectrum Leasing in Cooperative Cognitive Radio Networks

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Relay Selection and Power Allocation for Spectrum Leasing in...

第36届中国控制会议

作者： Zhixin Liu Mingye Zhao Yuan’ai Xie Xinbin Li Kai Ma Institute of Electrical Engineering Yanshan University

ISBN: (纸本)9781538629185

Cognitive radio is a promising technology to relieve the pressure of spectrum crisis with the sharp increasement ot wireless *** this paper,the game model for spectrum leasing in cognitive radio network is considered,where the Primary Transrnitter（PT） will choose some Secondary Transmitter（ST） as relay to resist multi-path fading and enhance the transmission *** a reward,the PT leases the authorized spectrum bands to the ST,which will use the authorized spectrum bands to communicate with the Secondary Receiver（SR）.The PT attempts to get more help from STs,meanwhile,in order to enhance transmission capacity,each ST wants to get more access time for authorized spectrum ***,game theory is employed to balance the profit between PT and *** from previous works,we focus on the dynamic leasing time of the authorized spectrum,which is the key factor that affects the transmission efficiency both of PT and *** employing game theory,we derive the Nash bargaining solution:the optimal spectrum leasing time and allocated power of *** with traditional case that PT directly transmits data to Primary base（PB）,the transmission efficiency of the PT in proposed model is improved ***,the ST gets more transmission *** results show that the proposed scheme is feasible and efficient.

关键词： Cognitive radio Game power allocation Relay selection Spectrum leasing

The Optimal power allocation Policies with Perfect Channel Side Information and Buffer State Information

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The Optimal Power Allocation Policies with Perfect Channel S...

The 2004 Joint Conference of the 10～(th) Asia-Pacific Conference on Communications and the 5～(th) International Symposium on Multi-Dimensional Mobile Communications

作者： Wei Chen Pingyi Fan Zhigang CaoDept. Electronic Engineering of Tsinghua UniversityState Key Lab on Microwave and Digital CommunicationsBeijing China

＜正＞In multi-user wireless communication systems, dynamic allocation of transmit power is an important means to deal with the time-varying nature both at physical layer and at network layer. Optimal power allocation with perfect channel and buffer state information is studied in this paper. We first build up the cross-layer model by integrating that of physical layer and network layer and then formulate the optimization problem on power and rate allocations. We prove that the optimal solution to power allocation problem can be regarded as an extension of traditional water-filling technique. The corresponding dynamic programming algorithm is presented. Finally, rate allocation problem is solved as an inverse problem to the power allocation.

关键词： wireless network power allocation fading channel cross-layer design