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无线协作网络中存在干扰时的中继选择协议 被引量:2
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作者 司江勃 李赞 刘增基 《西安交通大学学报》 EI CAS CSCD 北大核心 2010年第2期72-76,共5页
针对无线协作网络中共道干扰影响中继选择的问题,提出一种存在干扰的中继选择协议(RSI).该协议以最小化系统中断概率为目标,选择具有最大瞬时端到端信干比的中继节点转发源节点信息,并且在考虑直接传输时,目的节点采用选择合并... 针对无线协作网络中共道干扰影响中继选择的问题,提出一种存在干扰的中继选择协议(RSI).该协议以最小化系统中断概率为目标,选择具有最大瞬时端到端信干比的中继节点转发源节点信息,并且在考虑直接传输时,目的节点采用选择合并策略合并直接传输和中继传输,从而充分利用空间分集增益,降低了系统的中断概率.RSI协议不需要中继节点之间交互信息,通过竞争的方式完成数据传输,节省了系统开销,具有较好的实用性.仿真结果表明,在瑞利信道中,当中继节点个数为4、中断概率为10^-2时,与最大最小中继选择协议相比,RSI协议能够取得约3~4dB的信噪比增益. 展开更多
关键词 无线协作网络 干扰 中断概率 中继选择
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基于能量收集技术的无线协作网络中继选择 被引量:5
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作者 踪征雪 丁恩杰 +2 位作者 刘燕 张丙鑫 赵端 《工矿自动化》 北大核心 2020年第3期49-54,共6页
针对目前能量收集技术能够收集到的可用能量受限,导致无线协作网络中继节点处易出现能量短板的问题,为了避免整个网络因中继节点大量死亡而瘫痪,提出了一种基于能量收集技术的无线协作网络中继选择方案,即联合最大能量和最大数据传输链... 针对目前能量收集技术能够收集到的可用能量受限,导致无线协作网络中继节点处易出现能量短板的问题,为了避免整个网络因中继节点大量死亡而瘫痪,提出了一种基于能量收集技术的无线协作网络中继选择方案,即联合最大能量和最大数据传输链路的中继选择方案。首先,基于节点的能量收集状况,选出每跳中能量最大的节点进行解码转发;然后,结合每连续两跳的链路传输状态,选出与源节点和目的节点之间的数据传输信道最优者作为中继节点。结合Nakagami-m信道衰落模型,将该方案与随机选择方案、最大数据链路信道增益(MaDs)方案和基于中继-窃听链路最小信道增益(BNBF)方案进行对比分析,结果表明:在满足收集的能量足够用于下一时隙能量收集和数据传输的前提下,用于能量收集的比例越小,网络中断概率越小;联合最大能量和最大数据传输链路的中继选择方案在网络中断性能方面优于其他方案,其中断概率随信噪比的增大而减小,特别是当平均信噪比为38dB时,网络中断概率降到10^-5。 展开更多
关键词 矿山物联网 无线协作网络 能量收集 中继节点 中继选择 网络中断性能
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综合上下行链路的无线能量收集协作网络资源分配 被引量:1
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作者 周欣彤 肖琨 《浙江大学学报(工学版)》 EI CAS CSCD 北大核心 2023年第12期2544-2552,共9页
为了提高和平衡时分双工系统上下行链路之间的能效,在无线能量收集(EH)协作网络中开展节能资源分配算法研究.建立考虑无线能量收集、频谱共享、系统功率受限的协作网络模型;基于所建模型,形成综合上下行链路、功率约束、带宽约束和上下... 为了提高和平衡时分双工系统上下行链路之间的能效,在无线能量收集(EH)协作网络中开展节能资源分配算法研究.建立考虑无线能量收集、频谱共享、系统功率受限的协作网络模型;基于所建模型,形成综合上下行链路、功率约束、带宽约束和上下行速率匹配的优化问题,分别优化系统的绿色能效和传统能效.对优化问题进行数学分析,得到资源分配的最优解,即源节点、中继节点和目的节点的最优发射功率,上下行链路最优的带宽分配,能量收集节点最优的功率分割以及最优的系统能效;归纳得到分别基于系统绿色能效最大化和基于系统能效最大化的资源分配算法.对所建模型与所得资源分配算法开展蒙特卡洛仿真分析,将所得算法与文献算法进行对比.仿真结果表明,通过综合优化系统上下行链路的资源分配,所得算法有效提升了绿色能效和传统能效. 展开更多
关键词 无线协作网络 能量收集(EH) 资源分配 频谱共享 能量效率
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基于多维资源自适应分配的协作认知传输机制
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作者 李钊 李意文 《电子与信息学报》 EI CSCD 北大核心 2016年第9期2248-2254,共7页
该文针对协作认知无线电网络提出一种时域、频域和空域资源联合分配的传输机制,在改善授权用户传输性能的前提下使参与协作的认知用户获得合理的回报。所提机制利用多天线认知节点担任中继,通过自适应的时隙划分与带宽分配,对两跳传输... 该文针对协作认知无线电网络提出一种时域、频域和空域资源联合分配的传输机制,在改善授权用户传输性能的前提下使参与协作的认知用户获得合理的回报。所提机制利用多天线认知节点担任中继,通过自适应的时隙划分与带宽分配,对两跳传输链路中的瓶颈予以消除;并在包含多个协作认知用户的场景中,给出一种考虑公平性的中继选择算法。该方法一方面采用比例公平的思想实现认知用户间的公平性,另一方面通过调整奖励因子,使中继获得合理的回报。仿真结果表明,所提算法能够改善授权与认知系统的数据速率,同时给予认知中继公平的回报。 展开更多
关键词 协作认知无线网络 资源分配 自适应 中继选择 公平
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Reputation-Based Hierarchically Cooperative Spectrum Sensing Scheme in Cognitive Radio Networks 被引量:3
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作者 CHEN Huifang XIE Lei NI Xiong 《China Communications》 SCIE CSCD 2014年第1期12-25,共14页
Cooperative spectrum sensing in cog- nitive radio is investigated to improve the det- ection performance of Primary User (PU). Meanwhile, cluster-based hierarchical coop- eration is introduced for reducing the overh... Cooperative spectrum sensing in cog- nitive radio is investigated to improve the det- ection performance of Primary User (PU). Meanwhile, cluster-based hierarchical coop- eration is introduced for reducing the overhead as well as maintaining a certain level of sens- ing performance. However, in existing hierar- chically cooperative spectrum sensing algo- rithms, the robustness problem of the system is seldom considered. In this paper, we pro- pose a reputation-based hierarchically coop- erative spectrum sensing scheme in Cognitive Radio Networks (CRNs). Before spectrum sensing, clusters are grouped based on the location correlation coefficients of Secondary Users (SUs). In the proposed scheme, there are two levels of cooperation, the first one is performed within a cluster and the second one is carried out among clusters. With the reputa- tion mechanism and modified MAJORITY rule in the second level cooperation, the pro- posed scheme can not only relieve the influ- ence of the shadowing, but also eliminate the impact of the PU emulation attack on a rela- tively large scale. Simulation results show that, in the scenarios with deep-shadowing or mul- tiple attacked SUs, our proposed scheme ach- ieves a better tradeoff between the system robustness and the energy saving compared with those conventionally cooperative sensing schemes. 展开更多
关键词 cognitive radio networks coop- erative spectrum sensing cluster location cor- relation REPUTATION
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Broadband & Digital Content-Couple Subscriber Cooperative Relaying Networks for Uplink Transmission using Hierarchical Game Approach 被引量:3
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作者 Song Meil Teng Yinglei Niu Fang Zhang Yong Wang Li 《China Communications》 SCIE CSCD 2010年第2期16-31,共16页
Cooperation allows wireless network users to benefit from various gains such as an in- crease in the achieved rate or an improvement in the bit error rate. In the paper, we propose a distributed Hierarchical Game (HG... Cooperation allows wireless network users to benefit from various gains such as an in- crease in the achieved rate or an improvement in the bit error rate. In the paper, we propose a distributed Hierarchical Game (HG) theoretic framework over multi-user cooperative communication networks to stimulate cooperation and improve the network performance. First, we study a two- user decision making game in the OFDMA based subscriber cooperative relaying network, in which subscribers transmit their own data in the first phase, while helping to retransmit their partner's or choosing to freeride in the second phase. Instead of consulting to a global optimal solution, we decouple the cooperation resource allocation into two level subproblems: a user level Nash game for distributed cooperation decision and a Base Station (BS) level coalition game for centralized resource allocation. In the proposed HG algorithm, where mutual cooperation is preferred and total payoff is transferable, we prove it converges to a unique optimal equilibrium and resolve the subcarrier as-signment and power allocation among the couples. Besides, we discuss the existence of the publishing and rewarding coefficients in order to encourage cooperation. Then, we extend the HG to multi-user cases by coupling among subscribers according to the location information. The simulation results show that the proposed scheme with the distributed HG game achieves a well tradeoff between fairness and efficiency by improving the transmission efficiency of adverse users and outperforms those employing centralized schemes. 展开更多
关键词 cooperative relay hierachical game infrastructure relay subscriber relay Nash Equilibrium
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A Sensor-Service Collaboration Approach for Target Tracking in Wireless Camera Networks 被引量:1
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作者 Shuai Zhao Le Yu 《China Communications》 SCIE CSCD 2017年第7期44-56,共13页
Mobile target tracking is a necessary function of some emerging application domains, such as virtual reality, smart home and intelligent healthcare. However, existing portable devices for target tracking are resource ... Mobile target tracking is a necessary function of some emerging application domains, such as virtual reality, smart home and intelligent healthcare. However, existing portable devices for target tracking are resource intensive and high-cost. Camera tracking is an effective location tracking way for those emerging applications which can reuse the existing ubiquitous video monitoring system. This paper proposes a dynamic community-based camera collaboration(D3C) framework for target location and tracking. The contributions of D3C mainly include that(1) nonlinear perspective projection model is selected as the camera sensing model and sequential Monte Carlo is employed to predict the target location;(2) a dynamic collaboration scheme is proposed, it is based on the local community-detection theory deriving from social network analysis. The performance of proposed approach is validated by both synthetic datasets and real-world application. The experiment results show that D3C meets the versatility, real-time and fault tolerance requirements of target tracking applications. 展开更多
关键词 service collaboration camera tracking community detection sequential monte carlo
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