无线携能网络中一种基于时隙切换的中继辅助信能同传协议

针对网络终端设备低能耗和网络环境延长生命周期的需求,无线信息与能量协同传输技术已成为当前无线通信领域中新的绿色传输技术之一。论文以绿色无线携能（SWIPT）网络为研究背景,引入具有能量收集功能的SWIPT中继,给出了SWIPT网络中基于时隙切换（TS）的中继辅助信息与能量同传的场景与数学模型。论文设计了基于TS的中继辅助信能同传协议与SWIPT中继接收机结构,分析了系统中断性能（OP）与能效性能（EE）,给出了时隙切换因子对OP与EE的影响。数值仿真结果表明,为兼顾SWIPT网络中的中断和能效,源节点应以最优功率发送信号,以实现绿色SWIPT网络信息传输与能量收集均衡。      

可见光无线信能同传网络中能量有效的波束赋形设计

物联网是6G的核心应用场景,然而由于射频频谱资源稀缺,为数以百亿计的物联网设备提供高质量无线覆盖服务面临挑战。可见光通信(Visible Light Communication, VLC)作为射频通信的补充,提供了丰富的高频频谱资源。该文研究多用户VLC无线信能同传网络的可达能量效率(Energy Efficiency, EE)性能界,即在用户信息和能量需求、避免LED谐波失真以及VLC发射机总功率约束下最大化EE。为求解所考虑的问题,结合Dinkelbach方法和连续凸近似方法构建迭代算法优化波束赋形向量和直流偏置。从理论上证明了所提算法的收敛性,并讨论了避免LED谐波失真的工作条件对EE的影响。仿真结果验证了所提方法的有效性,分析了信息需求、能量需求和VLC发射机总功率对EE的影响规律,并讨论了LED视野对EE和VLC信号传播的影响。     

合作认知无线网络中能效最优资源分配

针对能量受限的合作认知网络,该文研究在保证主用户服务质量要求下,认知用户能量效率最大化问题。认知用户利用信能同传技术接收主用户信号,并采用解码转发协议协助主用户通信。基于分式规划和引入辅助变量将原始非凸问题转换为凸优化问题进行求解,并提出一种迭代的资源分配算法。仿真结果表明,所提算法能够快速收敛于最优解。与能量合作方案相比,该文所采用方案能量效率显著提高,同时能更好地保证主用户服务质量要求。     

多标签无线供电反向散射通信网络能效优化算法

为了提高物联网(IoT)节点的运行周期和能量利用率,该文提出一种多标签无线供电反向散射通信网络能效最大化资源分配算法。考虑传输速率约束、能量收集约束以及发射功率约束,建立了基于系统能效最大化的资源分配模型。利用Dinkelbach理论、2次变换以及变量替换法,将原分式非凸问题转化为可求解的凸优化问题。通过拉格朗日对偶理论求得优化问题的全局最优解。仿真结果表明,该算法具有较好的收敛性和能效。     

基于上行多用户大规模MIMO系统能效优化算法

针对上行多用户大规模多输入多输出（MIMO）系统,提出了基于能效优化的资源分配方法。所提方法采用迫零(ZF)接收,以最大化系统能效下界为准则,系统功率消耗考虑电路功率消耗和发射功率消耗2部分,通过联合调整基站端的发射天线数和用户的数据速率来优化能效函数。首先,根据目标函数的性质,证明全局最优速率分配和天线数的存在性和唯一性,然后,根据分数规划的性质,把原始的分数最优化问题转换成减式形式,进而提出一种新的迭代算法。仿真结果表明,所提算法以较少迭代次数取得了接近最优算法的性能。     

基于多小区通信系统能效优化研究

随着移动信息产业的发展,无线通信设备剧增,通信系统能耗也随之增加。不断攀升的系统能耗问题制约了移动通信的发展,以基站资源块和发射功率的最优分配方案来提高无线通信系统能效(EE,Energy Efficiency,能量效率)已经成为当下研究的热点。文章首先构造了系统能效优化的函数,采用KKT、凸优化的算法,获得最大的系统能效。然后针对系统能效优化的系统模型进行分析,对不同网络场景下的能效优化研究现状进行综述。最后,对多小区通信系统能效优化的研究进行了总结与分析。     

解码转发双向无线携能全双工中继系统的能效研究

为了优化双向单中继全双工系统的能效,在中继节点引入无线携能技术,提出了一个双向无线携能全双工中继系统。该系统中继节点以功率分割方式进行能量收集,将收集的能量用于解码转发,在保证用户的服务质量需求下,将能效优化问题转化为能量消耗最小的优化问题,依据传输时隙以及各时隙信道容量需求进一步划分为两个子优化问题;然后,以能效最大化为目标,根据各时隙的信道容量求出传输功率,利用解码转发特性求出传输时间和功率分割因子,得出能效最优解。仿真表明,所提出的双向无线携能全双工中继系统的能效是单向无线携能全双工系统的1.3倍、双向全双工放大转发中继系统的2倍和双向全双工解码转发中继系统的2.6倍。      

面向能效优化的MIMO系统参数配置

基于点对点多输入多输出(MIMO)通信系统的张量模型,提出了一种以能效最大化为目标的传输参数联合优化方法.首先根据信号矩阵、编码矩阵、信道矩阵构建了接收信号的张量模型和系统能效模型,然后利用张量平行因子(PARAFAC)分解的k-秩条件,通过迭代拟合对能效函数所包含的收发端天线数目、编码长度等传输参数进行联合优化.仿真结果表明,利用穷尽搜索,可以找到一组对应系统能效最大化的传输参数组合.     

ARM与传能光纤在激光雕刻系统中的应用

介绍了以嵌入式ARM9+S3C2440为控制核心及传能光纤为控制媒介的激光雕刻系统,对雕刻机控制系统的软硬件进行了设计,使雕刻机成本降低,控制精确。系统采用了雕刻范围大、可维护性好的传能光纤取代原有的复杂的光路系统。通过对步进电机和激光器开关电源的精确控制,实现高精度、高效率地雕刻加工。     

基于噢易硬盘保护系统的网络同传性能测试与分析

在高校实验室机房维护过程中,经常要对各个终端计算机进行网络同传。本文针对噢易硬盘保护系统的网络同传功能进行了性能测试,并对影响其性能的原因进行分析,最终得出结论,为以后的实验室计算机维护工作提供了一套行之有效的解决方案。     

Opportunistic secure transmission scheme for simultaneous wireless information and power transfer

Aiming at the different requirements of energy transmission and information transmission in simultaneous wireless information and power transfer (SWIPT),an opportunistic transmission scheme was proposed for enhancing physical layer security.Firstly,a SWIPT network with multi-cells was considered where multi-users,multi-eavesdroppers and the users were assumed to adopt time-switching based receivers and employ non-linear conversion model to harvest energy.The transmitter could dynamically switch between information transmission and power transfer according to the channel state,breaking the traditional fixed slot allocation scheme of energy transmission and information transmission.On this basis,the performances of energy transmission and information transmission were analyzed comprehensively,including the stability and efficiency of energy transmission,and the reliability and security of information transmission in the scenario of independent eavesdropping and joint eavesdropping.Next,a switching threshold optimization model was given to maximize its secrecy throughput under the constraint of the energy transmission,the reliability and secrecy performance requirements of information transmission.Finally,simulation results verify the validity of the proposed scheme.     

Artificial noise-aided robust secure information and power transmission scheme in heterogeneous networks with simultaneous wireless information and power transfer

A heterogeneous network with simultaneous wireless information and power transfer under the stochastic channel state information (CSI) error was considered.In this network,to guarantee the security and reliability of information and energy transmission,an artificial noise (AN)-aided robust secure information and power transmission scheme was proposed.By jointly designing the downlink information beamforming and AN matrix of macrocell base station and femtocell base stations,the eavesdroppers were jammed and the energy receiving performance of system was improved simultaneously.The problem of maximizing the energy receiving performance was modeled under the constraints on the base station power,the outage probability of information transfer and confidential information eavesdropped.Due to the probabilistic and rank-one constraints,this problem was non-convex.To obtain the solution,the original problem was first transformed into an equivalent form,which was easy to process.Then,the Bernstein-type inequality and the Large-deviation inequality was utilized to transform the outage probability limits into convex linear matrix inequalities,respectively.Finally,the rank-one beamforming constraints were processed with quadratic equality constraint procedure.Simulation results show that the proposed scheme has higher energy receiving performance and feasible performance in comparison with compared schemes,which validates the effectiveness and the robustness of our proposed scheme.     

PLC-RF无线传输网络中的能效最优设计方法

针对电力线通信（PLC）和射频（RF）无线通信混合传输的室内通信场景,提出了一种基于角度信息的信道状态信息（AI-CSI）的能效优先传输方案。首先,Wi-Fi无线网络和PLC网络分别作为主网络和次级网络,并且采用认知无线电技术来提高频谱效率的情况下,建立次级网络总能效最大化为目标函数的优化问题。其次,为了求解该问题,通过基于AI-CSI的迫零波束成形方法,获得波束成形权矢量,并进一步提出Dinkelbach与拉格朗日乘子法相结合的优化方法,进行最优的功率分配。最后,计算机仿真结果不仅验证了所提方案的有效性和优越性,而且分析了中继天线数和用户个数等典型参数对系统能效带来的影响,从而为实际系统设计提供了参考和依据。     

一种基于无线携能通信的MEC与用户匹配算法

多接入边缘计算（Multi-access Edge Computing,MEC）和无线携能通信可有效提高用户的服务质量和体验。在计算、通信和能量等资源的约束条件下,用户匹配是优化MEC任务卸载时系统效用的重要方法。针对无线携能通信的MEC网络结构,综合考虑用户的需求差异性和多元化能量供给,建立了基于计算资源、传输资源和能量资源的系统效用函数;以系统效用最大化为目标,采用基于多维背包理论的多轮拍卖,提出了一种适用于多用户和多网络边缘服务器的用户匹配算法。仿真验证了所提用户匹配算法的有效性与可靠性,结果表明所提匹配算法可优化系统资源配置,有效提高整体性能。     

Time-modulated multi-tone antenna array for wireless information and power transfer

This paper aims to design a multi-tone radiator exploiting harmonic radiation characteristic of time-modulated antenna array for wireless information and power transmission (WIPT) and multi-operational WIPT receiver. The time-modulated linear antenna array (TMLAA) radiating simultaneously at modulating and harmonic frequencies separated in multiple switching periods is utilized as a multi-tone radiating system. TMLAA with suitable power in harmonic bands generates multi-tone radiation by employing an optimized switching sequence. The ON and OFF time instants of the TMLAA are optimized to suppress sidelobe level and enhance sideband level. A population-based optimization algorithm, teaching learning based optimization (TLBO), is employed to optimize the ON and OFF instants of the TMLAA to suppress sidelobe level and enhance sideband level. TLBO is utilized for a 16-element TMLAA with minimizing cost function to achieve the above objectives. The 16-element TMLAA with optimized switching radiates multi-tone beams with a minimum of 5 dB peak power difference exploited as WIPT. The purpose of multi-operation is accomplished by utilizing the Wilkinson power divider in the receiver system; its power dividing capability is analyzed using applied wave research (AWR). A voltage doubler type rectifier is modeled for DC generation and is tested using AWR. The DC generating capability is tested for fixed power available at various frequencies, and the fixed desired frequency with various available power levels is tested. The results show that the designed circuitry provides a maximum of 80% power conversion efficiency (PCE).     

Optimization of wireless information and power transfer in multiuser OFDM systems

Simultaneous wireless information and power transfer (SWIPT), which belongs to energy harvesting techniques, is an important research topic. In existing literature, two SWIPT schemes, namely the time switching (TS) scheme and the power splitting (PS) scheme are adopted. For multiuser orthogonal frequency division multiple (OFDM) systems, this paper proposes a new SWIPT scheme named as the subcarrier sharing (SS) scheme. Resource allocation algorithms for the SS scheme are then proposed for maximizing the sum rate under the minimum harvested energy constraint. We show that the SS scheme outperforms the existing TS and the PS schemes.     

Simultaneous wireless information and power transfer with fixed and adaptive modulation

Activating Wireless Power Transfer (WPT) in Radio-Frequency (RF) to provide on-demand energy supply to widely deployed Internet of Everything devices is a key to the next-generation energy self-sustainable 6G network. However, Simultaneous Wireless Information and Power Transfer (SWIPT) in the same RF bands is challenging. The majority of previous studies compared SWIPT performance to Gaussian signaling with an infinite alphabet, which is impossible to implement in any realistic communication system. In contrast, we study the SWIPT system in a well-known Nakagami-m wireless fading channel using practical modulation techniques with finite alphabet. The attainable rate-energy-reliability tradeoff and the corresponding rationale are revealed for fixed modulation schemes. Furthermore, an adaptive modulation-based transceiver is provided for further expanding the attainable rate-energy-reliability region based on various SWIPT performances of different modulation schemes. The modulation switching thresholds and transmit power allocation at the SWIPT transmitter and the power splitting ratios at the SWIPT receiver are jointly optimized to maximize the attainable spectrum efficiency of wireless information transfer while satisfying the WPT requirement and the instantaneous and average BER constraints. Numerical results demonstrate the SWIPT performance of various fixed modulation schemes in different fading conditions. The advantage of the adaptive modulation-based SWIPT transceiver is validated.     

Distributed simultaneous wireless information and power transfer in multiuser amplify‐and‐forward ad hoc wireless networks

This paper studies the problem of stable node matching for distributed simultaneous wireless information and power transfer in multiuser amplify‐and‐forward ad hoc wireless networks. Particularly, each source node aims to be paired with another node that takes the role of an amplify‐and‐forward relay to forward its signal to the destination, such that the achievable rate is improved, in return of some payment made to the relaying node. Each relaying node splits its received signal from its respective source into two parts: one for information processing and the other for energy harvesting. In turn, a matching‐theoretic solution based on the one‐to‐one stable marriage matching game is studied, and a distributed polynomial‐time complexity algorithm is proposed to pair each source node with its best potential relaying node based on the power‐splitting ratios, such that their utilities or payments are maximized while achieving network stability. For comparison purposes, an algorithm to enumerate all possible stable matchings is also devised to study the impact of different matchings on the source and relay utilities. Simulation results are presented to validate the proposed matching algorithm and illustrate that it yields sum‐utility and sum‐payment that are closely comparable to those of centralized power allocation and node pairing, with the added merits of low complexity, truth telling, and network stability.     

磁耦合谐振无线携能通信系统建模与分析

摆脱有形介质的束缚,让信息与能量传输能够更加灵活方便一直是用户对于设备的潜在需求。文中基于磁耦合谐振方式提出一种无线能量与信息同步传输并形成信息回路反馈的方式,通过建立实验装置模型,验证系统方案的可行性,并对系统能量传输效率部分建立等效模型分析,通过仿真给出传输效率与距离的关系曲线,并通过对比仿真数据与实验数据,验证了等效模型分析的正确性。     

基于ERPT无线供电系统的设计

为了解决电能传输中由摩擦与传输介质老化产生的电能传输风险等问题,提出了基于电磁谐振型电能够传输技术（ERPT）的无线供电系统设计,主要通过调节发射场电磁频率使之与接收场固有频率一致,进而引起电磁共振产生强电磁耦合实现电能的无线高效传输。通过分析线圈谐振频率、互感系数、线圈内阻等参数之间的关系得到ERPT的理论效率值,并通过实际例子验证了理论值的正确性。