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2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)最新文献

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Outage Probability of Cooperative Relay Networks in eta-µ, kappa-µ and Mixed Fading Channels eta-µ、kappa-µ和混合衰落信道下协同中继网络的中断概率
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288003
Dharmendra Dixit, P. R. Sahu
Outage performance of cooperative relay networks using opportunistic decode-and-forward (DF) relaying in η-μ, κ-μ and mixed η-μ and κ-μ fading channels is analyzed. In DF relaying, a relay is allowed to forward the message from source only if the message is correctly decoded. The destination node combines both the direct signals from the source and the indirect signals from the relays using maximal-ratio diversity combining technique. In our analysis, exact closed-form expressions for the outage probability are obtained in η-μ, κ-μ and mixed η-μ and κ-μ fading channels, respectively. Numerical examples are provided to show the effect of number of relays, transmission rate and fading parameters on the outage probability. Numerical results are verified with Monte Carlo simulations.
分析了在η-μ、κ-μ和混合η-μ和κ-μ衰落信道中采用机会码转发(DF)中继的协同中继网络的中断性能。在DF中继中,只有当消息被正确解码时,才允许中继从源转发消息。目的节点采用最大比分集合并技术,将信号源的直接信号和中继的间接信号进行合并。在我们的分析中,分别得到了在η-μ、κ-μ和混合η-μ和κ-μ衰落信道中中断概率的精确封闭表达式。数值算例说明了中继数、传输速率和衰落参数对中断概率的影响。通过蒙特卡罗模拟验证了数值结果。
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引用次数: 3
On Power Allocation and User Grouping for Sparse Coded Non-Orthogonal Multiple Access in the Downlink 稀疏编码非正交多址下行链路功率分配与用户分组研究
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288409
Johannes Dommel, S. Faehse, L. Thiele
Sparse-spreading based non-orthogonal multiple access is considered to be a key component to support massive connectivity and increased capacity for future wireless communication systems. Since multiple users are co-scheduled on the same physical resources, power allocation cannot be optimized independently per user but also has to consider the assignment of resources between different users. This accounts specifically in the downlink, where the sum power constraint holds. In this paper, we propose a heuristic approach for power allocation in a downlink system using multi-user sparse coded multiple access. The motivation is to improve fairness within a group of users sharing the same physical resources in a non-orthogonal fashion and thus, simplify the receiver processing. An extensive simulation study reveals, that aligning the signal-to-noise ratio of each user within the group, user fairness can be improved without loosing system performance as long as the users are grouped carefully.
基于稀疏传播的非正交多址被认为是支持未来无线通信系统大规模连接和增加容量的关键组件。由于多个用户在同一物理资源上共同调度,所以不能针对每个用户单独优化电力分配,还必须考虑不同用户之间的资源分配。这尤其适用于下行链路,在下行链路中,和功率约束是有效的。本文提出了一种启发式的多用户稀疏编码多址下行系统功率分配方法。其动机是提高以非正交方式共享相同物理资源的用户组内的公平性,从而简化接收器处理。一项广泛的仿真研究表明,只要仔细地对用户进行分组,调整组内每个用户的信噪比,就可以在不损失系统性能的情况下提高用户公平性。
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引用次数: 1
Green C-RAN: A Joint Approach to the Design and Energy Optimization 绿色C-RAN:设计与能源优化的联合方法
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288133
Song Guo, Deze Zeng, Lin Gu
Wireless networks have experienced fast development in the past decades. Various advancing wireless technologies have been proposed. To catch up with the ever-increasing diverse communication needs, cloud-radio access networks (C-RAN), which decouples the baseband processing unit (BBU) from the remote radio head (RRH), has been proposed. On the other hand, it has been widely recognized that huge energy consumption has been raised due to the massive deployment of cellular networks. Lowering the network energy consumption therefore becomes a widely concerned topic. To combat the limitations in traditional power grid, smart grid, with the emphasis on distributed energy resource (DER) and bidirectional energy sharing, is advocated to power the wireless networks. In this paper, we are motivated to investigate a joint RRH-BBU association and energy sharing problem towards brown energy usage minimization in green energy powered C-RAN. The problem is formulated into a mixed integer linear programming (MILP) form. To address the computation complexity of solving MILP, a two-phase heuristic polynomial- time algorithm is proposed and evaluated via extensive simulation based studies.
在过去的几十年里,无线网络经历了快速的发展。人们提出了各种先进的无线技术。为了满足日益增长的多样化通信需求,提出了将基带处理单元(BBU)与远程无线电头(RRH)解耦的云无线电接入网(C-RAN)。另一方面,人们普遍认识到,由于蜂窝网络的大规模部署,造成了巨大的能源消耗。因此,降低网络能耗成为一个备受关注的话题。针对传统电网的局限性,倡导以分布式能源和双向能源共享为重点的智能电网为无线网络供电。在本文中,我们的动机是研究RRH-BBU联合和能源共享问题,以实现绿色能源供电的C-RAN中棕色能源使用的最小化。将该问题表述为混合整数线性规划(MILP)形式。为了解决MILP求解的计算复杂性,提出了一种两阶段启发式多项式时间算法,并通过广泛的仿真研究对其进行了评估。
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引用次数: 0
Bandwidth Minimization under Probabilistic Constraints and Statistical CSI for NOMA 概率约束下的带宽最小化和NOMA的统计CSI
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288401
Krishna Chitti, F. Rusek, Chaitanya Tumula
Non-Orthogonal Multiple Access (NOMA) is studied under statistical Channel State Information (CSI) and probabilistic constraints. Unlike the conventional power domain only NOMA, the definition of NOMA here considers both the power and the frequency domains simultaneously, where a flat power spectrum is assumed for each UE. This increases the capacity region when compared to the conventional definition. The problem of minimizing the number of consumed resource elements (REs) while satisfying the outage constraints is solved. An RE here is a frequency slot of unit bandwidth resolution, so the considered problem translates to a saving in bandwidth. The solution techniques involve a Gaussian Approximation of NOMA user rates and an offline empirical approach based on tail distributions. Numerical results show that the former is a good approximation while the latter provides exact results. In any case, these methods outperform the orthogonal multiple access techniques.
研究了统计信道状态信息(CSI)和概率约束下的非正交多址(NOMA)。与传统的仅功率域的NOMA不同,这里的NOMA定义同时考虑功率域和频域,其中假设每个UE都有平坦的功率谱。与传统定义相比,这增加了容量区域。解决了在满足中断约束的情况下最小化消耗资源元素数量的问题。这里的RE是单位带宽分辨率的频率槽,因此所考虑的问题转化为带宽的节省。解决技术包括对NOMA用户速率的高斯近似和基于尾部分布的离线经验方法。数值结果表明,前者是一个很好的近似,后者提供了精确的结果。在任何情况下,这些方法都优于正交多址技术。
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引用次数: 1
Maximized Traffic Offloading by Content Sharing in D2D Communication D2D通信中基于内容共享的最大流量分流
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288094
X. Yu, Chong Tan, Lin Ma, Min Zheng, Z. Bu
This paper studies the cellular traffic offloading in a content sharing network (CSN) where some mobile devices functioned as caching contributors can provide the nearby devices with popular contents on demand via D2D communication links. In consideration of the inherent selfishness of mobile users, the main challenge turns to be how to urge the device to maximize content sharing actively acting as the contributory caching device (CCD) via D2D link. To facilitate content sharing, a contribution-based incentive mechanism is introduced to encourage the CCDs. We formulate selectively caching as a matching problem and put forward a caching strategy to determine whether to cache some particular contents using Kuhn-Munkres algorithm. And the performances are validated by the numerical results.
本文研究了内容共享网络(CSN)中的蜂窝流量分流问题,其中一些移动设备作为缓存贡献者,通过D2D通信链路向附近的设备提供热门内容。考虑到移动用户固有的自私自利,如何通过D2D链接促使设备作为贡献缓存设备(CCD)主动最大化内容共享成为主要挑战。为了促进内容分享,我们设立了一个以捐款为基础的激励机制,鼓励资讯科技中心分享内容。我们将选择性缓存表述为一个匹配问题,并提出了一种使用Kuhn-Munkres算法确定是否缓存某些特定内容的缓存策略。数值结果验证了该方法的性能。
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引用次数: 3
Cognitive Radio Based Resource Allocation for Sum Rate Maximization in Dual Satellite Systems 基于认知无线电的双卫星系统总速率最大化资源分配
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287984
Dai Nguyen, T. M. Nguyen, L. Le
Satellites operating on same frequency bands with overlapping coverage can suffer from co-channel interference from the others. Hence, resource allocation and interference management for the multi-satellite system are very important to maintain the reliable communications and effective utilization of the radio resources. Such design typically requires the channel state information (CSI) of both desirable and interfering communication links; however, the large round trip delay in satellite communication renders the estimation of instantaneous CSI a difficult task. In this paper, we study the resource allocation for the uplink communications of two satellites using the cognitive radio concept where the two satellites are treated as the primary and secondary satellites. Many of conventional resource allocation problems for sum rate maximization deal with power management. Our design which does not require the instantaneous CSI knowledge aims to maximize the average sum rate of the secondary satellite by optimize both the secondary users' (SU) powers and angles toward the secondary satellite. To tackle the underlying non-convex resource allocation problem, we propose a block coordinate descent based iterative algorithm where in each iteration, the power allocation is solved optimally by using the dual based algorithm and the angles of SUs are determined to achieve the maximum average sum rate while maintaining the average interference constraints. We then conduct numerical studies and show significant performance improvement of the proposed algorithm compared to other conventional algorithms.
在重叠覆盖的同一频段上工作的卫星可能受到来自其他卫星的同信道干扰。因此,多卫星系统的资源分配和干扰管理对于保证通信的可靠性和无线电资源的有效利用具有重要意义。这种设计通常需要期望通信链路和干扰通信链路的信道状态信息(CSI);然而,卫星通信中较大的往返时延使得瞬时CSI的估计成为一项困难的任务。本文采用认知无线电的概念,将两颗卫星分别视为主卫星和副卫星,研究了两颗卫星上行通信的资源分配问题。许多传统的和率最大化资源分配问题都涉及到电源管理问题。我们的设计不需要即时的CSI知识,旨在通过优化辅助用户(SU)功率和对辅助卫星的角度来最大化辅助卫星的平均和速率。为了解决底层的非凸资源分配问题,提出了一种基于块坐标下降的迭代算法,在每次迭代中,使用基于对偶的算法进行最优的功率分配,并确定su的角度以实现最大的平均和速率,同时保持平均干扰约束。然后,我们进行数值研究,并显示与其他传统算法相比,所提出的算法的性能有显着提高。
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引用次数: 5
Generalized Pattern Search for Beam Discovery in Millimeter Wave Systems 毫米波系统波束发现的广义模式搜索
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287912
M. Jasim, N. Ghani
The use of beamforming techniques in millimeter wave systems is crucial for overcoming poor scattering channel impairments. This directional transmission and reception method compels the base station and mobile station to conduct exhaustive spatial beam search, i.e., to determine directions with optimum gains. Consequently, this technique results in high computational complexity, prolonged discovery times and energy inefficiency. Hence this paper proposes a novel initial beam discovery algorithm for sparse millimeter wave channels in non-line of sight outdoor environments. The discovery problem is formulated as an optimization problem, and a modified form of coordinated generalized pattern search is presented to mitigate the aforementioned limitations. Results show that the proposed algorithm delivers significant performance enhancement compared to existing solutions.
在毫米波系统中使用波束形成技术是克服散射信道缺陷的关键。这种定向发射和接收方法迫使基站和移动站进行穷举的空间波束搜索,即确定具有最佳增益的方向。因此,这种技术导致计算复杂度高、发现时间长、能源效率低。为此,本文提出了一种新的非视线室外稀疏毫米波信道初始波束发现算法。将发现问题表述为优化问题,并提出了一种改进的协调广义模式搜索形式以减轻上述局限性。结果表明,与现有算法相比,该算法具有显著的性能提升。
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引用次数: 20
Self-Interference Channel Characteristics of a 2x2 MIMO Full-Duplex Transceiver 2x2 MIMO全双工收发器的自干扰信道特性
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8287889
Fei Chen, R. Morawski, T. Le-Ngoc
This paper investigates the wideband self-interference (SI) channel characteristics for a 2x2 MIMO full-duplex (FD) transceiver with dual-polarized antennas. The measurements, carried out at 2.45GHz with 500MHz span in various environments: anechoic chamber, laboratory- room, and corridor, show that the SI-channel can be represented by a multipath model consisting of two segments: a quasistatic internal SI-sub-channel due to the specific Tx/Rx antenna structure and a time-varying or dynamic external SI-sub-channel due to possible reflections from the surrounding environment. The quasi-static internal SI-sub-channel parameters can be derived from the Tx/Rx antenna structure specifications. The dynamic external SI-channel exhibits cluster reflection arrival features and can be modeled by a modified Saleh-Valenzuela (S-V) model, and the cluster power decays exponentially with cluster arrival delay. However, the path power-versus-arrival delay decay is exponential in a laboratory-room environment while it follows the power law in a corridor environment.
研究了一种具有双极化天线的2x2 MIMO全双工(FD)收发器的宽带自干扰信道特性。在各种环境(暗室、实验室室和走廊)中,在2.45GHz和500MHz范围内进行的测量表明,si通道可以由由两部分组成的多径模型表示:由于特定的Tx/Rx天线结构而产生的准静态内部si子通道和由于周围环境可能反射而产生的时变或动态外部si子通道。准静态内部si子通道参数可以从Tx/Rx天线结构规格中导出。动态外部si通道具有簇反射到达特征,可以用改进的Saleh-Valenzuela (S-V)模型来建模,簇功率随簇到达延迟呈指数衰减。然而,在实验室环境中,路径功率与到达延迟的衰减是指数的,而在走廊环境中,它遵循幂律。
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引用次数: 4
Maximum Achievable Rates with Transmission and Circuit Total Power Constraints 传输和电路总功率限制下的最大可实现速率
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288113
M. Shaqfeh, F. Al-Qahtani, Salah Hessien, H. Alnuweiri
In classical information and communication theory, channel capacity and achievable rate over Gaussian channels, whether for constant or fading channels and whether for single user or multiple users, are characterized as functions of the power that is used for the transmission of the information. The associated circuit power that is needed in real communication transceivers to power up the electronics and to do all required signal processing is typically not involved in the capacity characterization. However, to achieve global energy efficiency of the communication systems, the adaptation of the communication schemes should be based on total power consumption. In this paper, we characterize the maximum achievable rates over many fundamental channels taking total power constraints into considerations.
在经典的信息和通信理论中,高斯信道上的信道容量和可达速率,无论是恒定信道还是衰落信道,无论是单用户信道还是多用户信道,都被表征为用于传输信息的功率的函数。在实际的通信收发器中,为电子设备供电和完成所有所需的信号处理所需的相关电路功率通常不涉及容量表征。然而,为了实现通信系统的整体能源效率,通信方案的适应应以总功耗为基础。在本文中,我们在考虑总功率约束的情况下,描述了许多基本信道上可实现的最大速率。
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引用次数: 0
Prototype System Based Enhanced Scheduled Access Mechanism for WBAN 基于原型系统的WBAN增强型调度访问机制
Pub Date : 2017-09-01 DOI: 10.1109/VTCFall.2017.8288163
Yao Zhang, Changle Li, T. Luan, Yueyang Song, Xiaoming Yuan
Wireless Body Area Networks (WBANs) have attracted significant attentions because of their important role in medical applications with the development of requirements in health monitoring and diagnosis. IEEE 802.15.6, as the international standard for WBAN, supports network in operating on, in or around human body. Owing to the special propagation characteristics as affected by human body, WBAN needs reliable access mechanism to guarantee the stability of nodes access and information transmission. To achieve the high slot utilization rate and low average packet delay, we propose a gated scheduled access mechanism based on IEEE 802.15.6 and study the impact of allocation slot length on network performance. To examine the performance of our proposal, we conduct hardware experiment through a novel prototype system based on IEEE 802.15.6 standard. The experiment results show that the obtained optimal allocation slot length under the gated scheduled access mechanism can well satisfy the Quality of Service (QoS) requirements in different data rates, which is consistent with the results of theoretical analysis. The comparison results also show that our prototype system can be a practical reference in the future study of wireless body area network.
随着健康监测和诊断需求的发展,无线体域网络(wban)在医学应用中的重要作用引起了人们的广泛关注。IEEE 802.15.6作为WBAN的国际标准,支持网络在人体上、人体内或人体周围运行。WBAN由于受人体影响的特殊传播特性,需要可靠的接入机制来保证节点接入和信息传输的稳定性。为了实现高的插槽利用率和低的平均分组延迟,我们提出了一种基于IEEE 802.15.6的门控调度访问机制,并研究了分配插槽长度对网络性能的影响。为了验证该方案的性能,我们通过基于IEEE 802.15.6标准的新型原型系统进行了硬件实验。实验结果表明,在门控调度访问机制下得到的最优分配时隙长度能够很好地满足不同数据速率下的服务质量(QoS)要求,与理论分析结果一致。对比结果也表明,该原型系统可为今后无线体域网络的研究提供实用参考。
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引用次数: 0
期刊
2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)
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