在具有点到点通信的蜂窝网络中面向节能的分布式功率控制(英文)

Device-to-Device(D2D) communication has been proposed as a promising implementation of green communication to benefit the existed cellular network.In order to limit cross-tier interference while explore the gain of short-range communication,we devise a series of distributed power control(DPC) schemes for energy conservation(EC)and enhancement of radio resource utilization in the hybrid system.Firstly,a constrained opportunistic power control model is built up to take advantage of the interference avoidance methodology in the presence of service requirement and power constraint.Then,biasing scheme and admission control are added to evade ineffective power consumption and maintain the feasibility of the system.Upon feasibility,a non-cooperative game is further formulated to exploit the profit in EC with minor influence on spectral efficiency(SE).The convergence of the DPC schemes is validated and their performance is confirmed via simulation results.     

一种分布式蜂窝通信功率控制算法

在蜂窝通信系统中，为了减小由于频率复用造成的共信道干扰，必须对用户的发送功率进行控制。针对已有文献存在的问题，如控制步长和迭代需要全局信息，迭代步数对于信道环境敏感，迭代约束条件苛刻等，本文提出了一种新型的分布式功控算法。研究结果表明，与其它算法相比，本算法性能和迭代速度得到明显提高。     

Ad hoc网络非合作博弈功率控制研究

根据Ad hoc网络的分布式特性,提出一种新的以干扰为代价的非合作功率控制博弈算法,让产生较大干扰的发送节点受到更多惩罚,验证其存在唯一的纳什均衡。仿真结果表明,该算法具有较快的收敛速度,与NPG和NPGP模型相比,可以有效抑制产生较大干扰的链路的发送功率。在保证链路接收信号质量的同时,不仅有效减小干扰以提高网络容量,而且还在一定程度上兼顾了节点之间的公平性。     

Performance Tradeoff Between Energy Conservation and User Fairness for D2D Communication Underlaying Cellular Networks

Device-to-Device (D2D) communication is viewed as an emerging technology in the fifth generation systems to fully explore the proximate gain residing in lo-cal communicating pairs. But the interference imposed to the existing Cellular links (C-link) should be addressed in the optimization for underlaid D2D links (D-link). There is a performance tradeoffbetween Energy conservation (EC) and the number of links with satisfied Quality-of-service (QoS) requirement or System capacity (SC). We aim to weight the above tradeofffor D-links by specifying it into optimizing EC on the condition that SC is maximized and QoS requirements of C-links are fully guaranteed. A three-stage joint power control and channel assignment mecha-nism is proposed including feasibility check, SC maximiza-tion and greedy optimization for EC. Thanks to numeri-cal results, we illustrate the necessity to conduct our per-formance tradeoffand observe the gain when multiple re-source variables are in elaborate cooperation.     

D2D通信系统中节能功率控制算法

针对设备到设备(D2D)通信的功率控制问题,该文提出一种带有权重的优化异构小区能效的目标以及在该问题下一个基于博弈理论的学习方法。具体地,在利用一个下界表达式代替原始优化目标的情况下,建模这个功率控制问题为一个势博弈模型,并且证明它的最优纳什均衡点就是优化下界的最优解。最后,为了找到这个最优的纳什均衡点,设计一个低复杂度和快速收敛的学习算法。仿真结果表明该文提出方法的可行性和有效性。     

混合蜂窝和端到端网络中的分布式功率控制算法

该文针对蜂窝模式和端到端模式混合网络,提出了一种端到端分布式功率控制方法。该算法以最大化系统频谱效率为目标,以凸优化工具为基础,提出了分布式功率控制的具体算法。在算法设计中考虑了混合网络中不同通信模式之间的有害干扰,提出了有效的干扰避免方法,从而提高了系统吞吐量。仿真结果对算法的收敛性和性能进行了验证。     

衰落信道下基于中继选择与功率控制的节能协作通信

In order to save energy and make more efficient use of wireless channel, this article puts forward an energy saving cooperative relaying scheme which actuates the cooperative transmission only when the feedback from the destination indicates failure of the direct transmission. The proposed scheme selects the optimal relay and its corresponding transmission power in each time slot based on channel condition and residual energy with the objective of minimizing energy consumption and extending network lifetime. In the study, the finitestate Markov channel model is used to characterize the correlation structure of channel fading in wireless networks, and the procedure of relay selection and transmission power decision is formulated as a Markov decision process. Numerical and simulation results show that the proposed scheme consumes less energy and prolongs the network lifetime.     

蜂窝终端直通混合网络中基于不同终端速率要求的资源调度策略

该文针对蜂窝终端直通(Device-to-Device,D2D)混合网络的两类终端提出一种新的无线资源调度策略,以提高混合网络整体性能实现无线资源的高效利用。该文无线资源调度问题分为频谱资源块和终端功率分配两个部分,首先,对该问题以混合网络和速率最大为优化目标进行理论建模,其约束条件为最大功率限制以及速率需求比值。速率需求比值可以用来区分蜂窝和直通(D2D)两类终端各自的速率需求,从而满足不同的服务质量(Quality of Service,QoS)。接着,通过拉格朗日乘数求解法,得到了上述最优化问题的最优解,即蜂窝和直通(D2D)终端分配的最优资源块序号以及功率值。从最优解可以看出,资源块的选取和功率分配两者互为条件选择的关系。根据这一结论,该文给出相应的调度策略,其中功率分配部分采用注水算法来实现。最后,通过系统级仿真,可以看出提出的新调度策略在混合网络的总吞吐和终端用户的公平性上都可实现较大提升。     

干扰系统中基于非合作博弈的功率控制

对现有干扰系统中非合作博弈功率控制问题进行了总结和分析。主要分析了四种效用函数,并研究了相应的应用策略。从中可以看出,基于互信息量的效用函数运算较复杂,目标容量确定下的效用函数与目标信干噪比确定下的效用函数在性能不影响的情况下,计算复杂度大大降低。基于效率的效用函数能有效抑制各用户对发射功率的盲目追求,提高了用户单位功率下的性能,即提高了效率。     

一种基于分布式功率控制的侧行链路高谱效传输机制

第五代(5th Generation, 5G)无线通信系统除了支持蜂窝通信,还支持侧行链路(Sidelink, SL)通信,即两个用户设备(User Equipment, UE)之间可以直接通信,而不需要经过基站中转,有利于降低传输时延、提升资源利用率。在现有的SL分布式系统中,主要通过简单的能量测量进行干扰规避,资源复用准则欠佳,导致中高用户密度场景下吞吐受限。为此,提出了一种基于分布式功率控制的SL高谱效传输机制。各发送UE基于目标链路的信道状态信息(Channel State Information, CSI)和其他干扰链路的CSI进行功率优化,以实现局部范围内多个通信链路的和吞吐最大化;进一步,设计了广播式的CSI测量上报机制能实现多链路的分布式功率控制和资源选择。仿真结果表明,所提方案相比于现有的SL分布式资源分配机制,在中高用户密度下可获得30%～100%的吞吐增益;此外,所提方案相比于现有WiFi的载波侦听多址(Carrier Sense Multiple Access, CSMA)分布式信道接入机制,在中高用户密度下可获得50%～200%的吞吐增益。     

Distributed Power Control for Energy Efficient Routing in Ad Hoc Networks

In this paper, distributed power control is proposed as a means to improve the energy efficiency of routing algorithms in ad hoc networks. Each node in the network estimates the power necessary to reach its own neighbors, and this power estimate is used both for tuning the transmit power (thereby reducing interference and energy consumption) and as the link cost for minimum energy routing. With reference to classic routing algorithms, such as Dijkstra and Link State, as well as more recently proposed ad hoc routing schemes, such as AODV, we demonstrate by extensive simulations that in many cases of interest our scheme provides substantial transmit energy savings while introducing limited degradation in terms of throughput and delay.     

现代通信网的分布式供电设计

分析了通信网的供电方式,讨论了分布式供电的优缺点以及现代通信网的供电要求。提出了一种能满足现代通信设备供电要求分布式供电方案,对从事现代通信网供电设计的工程技术人员有一定指导意义。     

Distributed Discrete Power Control in Cellular PCS

Transmitter power control has proven to be an efficient method to control cochannel interference in cellular PCS, and to increase bandwidth utilization. Power control can also improve channel quality, lower the power consumption, and facilitate network management functions such as mobile removals, hand-off and admission control. Most of the previous studies have assumed that the transmitter power level is controlled in a continuous domain, whereas in digitally power controlled systems, power levels are discrete. In this paper we study the transmitter power control problem using only a finite set of discrete power levels.The optimal discrete power vector is characterized, and a Distributed Discrete Power Control (DDPC) algorithm which converges to it, is presented. The impact of the power level grid on the outage probability is also investigated. A microcellular case study is used to evaluate the outage probabilities of the algorithms.     

中继增强的无线蜂窝多小区系统的联合调度与功率控制算法

针对采用全局频率复用的中继增强的无线蜂窝多小区系统,该文考虑多种通信模式并存的混合场景,提出了一种干扰感知的联合资源分配策略。以最大化系统总吞吐量为目标,同时考虑小区间干扰对中继节点与移动站点的影响,以及基站与中继节点各自的发射功率约束。为了降低计算复杂度,针对用户与中继节点配对问题提出了一种基于小区间干扰的调度算法;针对功率控制问题分别提出了一种基于符号规划的最优功率分配算法和一种次优的最小能耗功率分配算法。仿真结果表明,该文所提算法逼近最优资源分配,在系统吞吐量与能量效率等性能方面具有显著优势。     

多输入多输出天线蜂窝系统中的分布式功率控制方法

在蜂窝无线通信系统设计中,基于信号干扰比(SIR)测量的功率控制方法得到广泛的应用。该文提出多输入多输出(MIMO)天线蜂窝系统中的基于SIR测量的分布式功率控制(DPC)方法。该方法通过控制移动台或者基站的发射功率可以达到以下两个目标的其中之一：(1)最小化所有基站或者移动台的平均接收SIR中断概率;(2)在满足目标SIR要求的前提下最小化平均发射功率。数值仿真结果显示,该文提出的DPC方法在低的计算复杂度下,可以达到降低SIR中断概率和减小发射功率的目的。     

CDMA蜂窝集群前向功率控制技术的研究

本文对基于CDMA的集群通信系统的功率控制进行了初步的研究。针对集群通信的特点，本文提出了CDMA共享信道的概念和集中式前向功率控制技术，并进行相应的仿真。结果表明，该技术很好地解决了在CDMA蜂窝通信中实现集群功能的功率控制问题，大大增加了系统的容量。     

Uplink Power Control for MIMO-OFDMA Cellular Systems

In this paper, we propose a novel uplink power control algorithm, SMST, for multiple-input multiple-output orthogonal frequency-division multiple access (MIMO-OFDMA).We perform an extensive system-level simulation to compare different uplink power control algorithms, including the FPC adopted in 3GPP LTE and LTE-Advanced. Simulations show that SMST adopted in IEEE 802.16m outperforms other algorithms in terms of spectral efficiency, cell-edge performance, interference control, and trade-off control between sector-accumulated throughput and cell-edge user throughput. The SMST performance gain over FPC can be more than 40%.     

基于博弈论功率控制的串行干扰消除算法

无线网络实现串行干扰消除算法可以提高网络吞吐量,在采用串行干扰消除算法的无线网络系统中,如何控制节点间传输功率使系统效用最大化是一个NP-Hard难题。针对此问题提出非合作博弈算法来解决节点间的传输功率控制,提出了串行干扰消除算法功率控制的非合作博弈,证明了纳什均衡,所提算法可以获得较高的无线网络吞吐量,仿真实验证实了分析结果并展示了算法的优越性。     

一种新的认知无线电非合作功率控制博弈算法

当认知无线电网络以"衬底式"(Underlay)的方式与主用户网络共享频谱时,需要对认知用户进行功率控制,以确保认知用户在不干扰主用户的前提下,公平地共享认知频谱资源。利用博弈分析的方法,设计了一个基于链路增益因子的代价函数,并据此提出了一种新的非合作功率控制博弈算法。仿真结果表明,该算法的均衡结果既改善了用户的帕累托(Pareto)性能,又提高了链路增益较差的用户的吞吐量,实现了网络资源的平等共享。     

Distributed Power Balancing with Linear Prediction and Adaptive On-Off Strategies for CDMA Cellular Mobile Systems

Several distributed balance (DB) power control algorithms that can achieve SIRbalance have already been proposed for cellular mobile systems [1–3].In the present paper, two simple strategies, namely linear prediction andadaptive on-off strategies, are further applied to forward link distributedbalance (DB) power control in DS/CDMA cellular mobile systems. The linearprediction is used to track the variance of the short-term fading andcompensate it in advance, and the adaptive on-off strategy is applied to solvethe problem that the received SIR of all the communication links less than theminimum required SIR. Simulation results indicate that DB power control withthese two strategies can achieve much better performance than the original DBpower control.