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2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)最新文献

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Stochastic Graph Filtering Under Asymmetric Links in Wireless Sensor Networks 无线传感器网络非对称链路下的随机图滤波
Leila Ben Saad, B. Beferull-Lozano
Wireless sensor networks (WSN s) are often characterized by random and asymmetric packet losses due to the wireless medium, leading to network topologies that can be modeled as random, time-varying and directed graphs. Most of existing works related to graph filtering in the context of WSNs assume that the probability of delivering an information from one node to a neighbor node is the same as in the reverse direction. This assumption is not realistic due to the typical link asymmetry in WSNs caused by interferences and background noise. In this work, we analyze the problem of applying stochastic graph filtering over random time-varying asymmetric network topologies. We show that it is possible to perform stochastic graph filtering under asymmetric links with node-variant graph filters, while optimizing a trade-off between the expected error (bias) and the variance of the error, with respect to performing graph filtering over a fixed static topology given by a certain connectivity radius of the nodes.
无线传感器网络(WSN)的特点是由于无线介质导致的随机和非对称丢包,导致网络拓扑可以建模为随机、时变和有向图。现有的大多数与wsn背景下的图过滤相关的工作都假设从一个节点向相邻节点传递信息的概率与反向传递信息的概率相同。由于干扰和背景噪声导致的无线传感器网络中典型的链路不对称,这种假设是不现实的。在这项工作中,我们分析了在随机时变非对称网络拓扑上应用随机图滤波的问题。我们证明了在非对称链路下使用节点变量图过滤器执行随机图过滤是可能的,同时优化预期误差(偏差)和误差方差之间的权衡,相对于在由节点的特定连接半径给定的固定静态拓扑上执行图过滤。
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引用次数: 5
Full-Duplex Amplify-and-Forward Transmitter Cooperations for Compound Multiple Access Channels 复合多址通道的全双工放大和转发发射机合作
Jianhao Huang, Dan Wang, Chuan Huang
This paper considers a compound multiple access channel (MAC), where two transmitters send two messages to two receivers respectively and each receiver decodes both the source messages. In particular, transmitter cooperations by utilizing in-band full-duplex (FD) amplify-and-forward (AF) scheme are deployed to enhance the system performance. Based on the proposed scheme, the equivalent channel model is analyzed, as well as the statistics of the accumulated residual self-interference and noise (ARIN). With the joint decoding scheme, the corresponding achievable rate region is derived by a two-step iterative algorithm. Simulation results reveal that the proposed scheme can significantly improve the achievable rate under several typical scenarios.
本文研究了一种复合多址信道(MAC),其中两个发送器分别向两个接收器发送两个消息,每个接收器对两个源消息进行解码。特别是,利用带内全双工(FD)放大转发(AF)方案部署发射机合作,以提高系统性能。在此基础上,分析了等效信道模型,统计了累计残差自干扰和噪声(ARIN)。采用联合译码方案,通过两步迭代算法推导出相应的可达率区域。仿真结果表明,在几种典型场景下,该方案可以显著提高可达率。
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引用次数: 2
Ultrasonically Rechargeable Platforms for Closed-Loop Distributed Sensing and Actuation in the Human Body 用于人体闭环分布式传感和驱动的超声可充电平台
R. Guida, T. Melodia
In the near future, innovative medical therapies will be administered by means of intra-body wireless sensor networks of implantable medical devices (IMDs). However, realizing wireless networks with traditional implantable biosensors and actuators is challenging, because (i) they often rely on wired connections that are invasive and prone to infections; and (ii) they are powered by batteries that occupy most of the device volume and have a relatively short lifetime. This article reports on the design of a system of interconnected implantable nodes that leverage ultrasonic wireless propagation to (i) be remotely recharged, removing the need for batteries; (ii) to create wireless communication links avoiding wires or radio-frequency (RF) connections that have poor performance when operating in tissues. We illustrate the design of the core building blocks to realize ultrasonically rechargeable medical sensors and actuators equipped with ultrasonic connectivity. We further demonstrate their use in a practical implementation of a sensing/actuation closed-loop system with distributed sensor nodes. We also develop and experimentally validate a mathematical model to predict the system performance.
在不久的将来,创新的医疗疗法将通过植入式医疗设备(imd)的体内无线传感器网络进行管理。然而,用传统的植入式生物传感器和执行器实现无线网络是具有挑战性的,因为(i)它们通常依赖于有线连接,这是侵入性的,容易感染;(ii)它们由电池供电,电池占据了设备的大部分体积,使用寿命相对较短。这篇文章报道了一个相互连接的可植入节点系统的设计,该系统利用超声波无线传播来(1)远程充电,消除了对电池的需求;(ii)建立无线通信链路,避免在组织中运行时性能不佳的有线或射频(RF)连接。我们举例说明了实现超声可充电医疗传感器和具有超声连接的执行器的核心构建模块的设计。我们进一步演示了它们在具有分布式传感器节点的传感/驱动闭环系统的实际实现中的应用。我们还开发并实验验证了预测系统性能的数学模型。
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引用次数: 3
Online Energy-Efficient Power Control in Wireless Networks by Deep Neural Networks 基于深度神经网络的无线网络在线节能功率控制
A. Zappone, M. Debbah, Z. Altman
The work describes how deep learning by artificial neural networks (ANNs) enables online power allocation for energy efficiency maximization in wireless interference networks. A deep ANN architecture is proposed and trained to take as input the network communication channels and to output suitable power allocations. It is shown that this approach requires a much lower computational complexity compared to traditional optimization-oriented approaches, dispensing with the need of solving the optimization problem anew in each channel coherence time. Despite the lower complexity, numerical results show that a properly trained ANN achieves similar performance as more traditional optimization-oriented methods.
该研究描述了人工神经网络(ann)的深度学习如何在无线干扰网络中实现在线功率分配,以实现能效最大化。提出并训练了一种深度神经网络结构,以网络通信信道作为输入,输出合适的功率分配。结果表明,与传统的面向优化的方法相比,该方法的计算复杂度要低得多,并且无需在每个通道相干时间内重新求解优化问题。尽管复杂度较低,但数值结果表明,经过适当训练的人工神经网络的性能与传统的面向优化的方法相似。
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引用次数: 34
Super-Resolution for Achieving Frequency Division Duplex (FDD) Channel Reciprocity 实现频分双工(FDD)信道互易的超分辨率
Wanshan Yang, Lijun Chen, Y. Liu
Channel state information at transmitter (CSIT) allows wireless communication systems to fully utilize the degree of freedom of the channel. Time division duplex (TDD) systems can take the advantage of channel reciprocity to obtain forward link CSIT from reverse link training. We tackle the seemingly impossible task of doing the same for frequency division duplex (FDD) systems, where the conventional method is to obtain CSIT from feedback from the receiver. Channel state feedback causes delay and consumes prohibitive amount of system resource, especially when the number of transmit antennas is large, such as in massive MIMO systems. However, if the channel parameters, such as the complex path gain, path delay, and angle of arrival/departure of each individual path, are accurately estimated from pilot signals in one frequency band, the channel state in another frequency band can be calculated from these parameters. Accuracy is the key because small estimation error will be magnified by the multiplication of the frequency difference between the bands. The required accuracy is not achievable for narrow band and single antenna systems. But current and future wireless systems have and will have increasingly large bandwidth and number of antennas, making the FDD channel reciprocity possible. To achieve the FDD channel reciprocity, we propose to employ super-resolution theory. Another possible compressed sensing approach is to put the channel parameters on a multi-dimensional grid and for each point of the grid, estimate the corresponding complex gain. We adapt both approaches for our problem and show that the compressed sensing approach is not well suited for this purpose and the super-resolution approach can achieve our goal.
发射机信道状态信息(CSIT)允许无线通信系统充分利用信道的自由度。时分双工(TDD)系统可以利用信道互易性从反向链路训练中获得正向链路CSIT。我们解决了看似不可能的任务,为频分双工(FDD)系统做同样的事情,其中传统的方法是从接收器的反馈中获得CSIT。信道状态反馈会导致延迟,并消耗大量的系统资源,特别是在发射天线数量很大的情况下,例如在大规模MIMO系统中。然而,如果从一个频段的导频信号中准确地估计出通道参数,如复路径增益、路径延迟和每条路径的到达/离开角,则可以从这些参数中计算出另一个频段的通道状态。精度是关键,因为小的估计误差将被放大的频带之间的频率差的乘法。对于窄带和单天线系统,所要求的精度是无法实现的。但是当前和未来的无线系统已经并将拥有越来越大的带宽和天线数量,这使得FDD信道互易成为可能。为了实现FDD信道互易性,我们提出采用超分辨率理论。另一种可能的压缩感知方法是将通道参数放在多维网格上,并对网格的每个点估计相应的复增益。我们采用这两种方法来解决我们的问题,并表明压缩感知方法不适合这个目的,而超分辨率方法可以实现我们的目标。
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引用次数: 13
Delay Performance of Multi-Antenna Multicasting in Wireless Networks 无线网络中多天线组播的延迟性能
M. Kountouris, Apostolos Avranas
Low-latency communication is currently attracting significant attention due to the emergence of mission-critical Internet of Things (IoT) applications and content-centric services. A deep understanding of the delay performance is essential for efficient wireless system design and end-to-end latency guarantees. In this paper, we investigate the network-layer performance of physical layer multi-antenna multicasting, i.e., when the same data is simultaneously conveyed to multiple users. We provide a statistical characterization of the service process in terms of its Mellin transform and derive probabilistic delay bounds using tools from stochastic network calculus. Furthermore, using extreme value theory, we characterize the service process for very large number of users and derive scaling laws as the number of antennas an d/or users is taken to infinity. Our results can be used for system dimensioning to guarantee the delay requirements in wireless multicast networks.
由于任务关键型物联网(IoT)应用和以内容为中心的服务的出现,低延迟通信目前引起了极大的关注。深入了解延迟性能对于有效的无线系统设计和端到端延迟保证至关重要。在本文中,我们研究了物理层多天线组播的网络层性能,即当相同的数据同时传送给多个用户时。我们用Mellin变换给出了服务过程的统计特征,并利用随机网络微积分的工具导出了服务过程的概率延迟界。在此基础上,利用极值理论刻画了用户数量非常大时的服务过程,并推导出天线和用户数量趋近无穷大时的标度规律。我们的研究结果可用于无线组播网络的系统维数,以保证延迟要求。
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引用次数: 3
Analysis of a One-Dimensional Continuous Delay-Tolerant Network Model 一维连续容延迟网络模型的分析
D. Cheliotis, Ioannis Kontoyiannis, M. Loulakis, S. Toumpis
The packet speed and transmission cost are examined, for a single packet traveling along a simple one-dimensional, continuous-time network, using a combination of wireless transmissions and physical transports. We assume that the network consists of two nodes moving at constant speed on a circle, and changing their direction of travel after independent exponential times. The packet wishes to travel in the clockwise direction as fast and as far as possible. It travels either by being physically transported on a node's buffer, or by being wirelessly transmitted to the other node when the two are in the same location. We derive exact, explicit expressions for the long-term average packet speed (in the clockwise direction), and also for the average wireless transmission cost. These results can be viewed as initial steps towards the development of analogous exact expressions for the speed and cost, in more realistic, two-dimensional wireless delay-tolerant network models.
在简单的一维连续网络中,使用无线传输和物理传输的组合,对单个数据包的传输速度和传输成本进行了检查。我们假设网络由两个节点组成,在圆周上以恒定速度运动,并在独立的指数次后改变其行进方向。数据包希望沿顺时针方向尽可能快和远地行进。它可以在节点的缓冲区上进行物理传输,也可以在两个节点处于同一位置时通过无线传输到另一个节点。我们推导出长期平均数据包速度(顺时针方向)和平均无线传输成本的精确、显式表达式。这些结果可以被看作是在更现实的二维无线容忍延迟网络模型中开发速度和成本的类似精确表达式的初步步骤。
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引用次数: 2
Zero-Padded FDM-FDCP: Real-Time Signal Processing for Underwater Channels 零填充FDM-FDCP:水下信道的实时信号处理
Thomas R. Dean, Mainak Chowdhury, A. Goldsmith
We present an extension of the FDM-FDCP waveform and demonstrate the performance of this waveform in underwater acoustic channels in the presence of AWGN. In this extension, we simply replace the frequency-domain cyclic prefix with guard bands, analogous to zero-padded OFDM. We argue and provide empirical evidence for that this approach in fact improves performance. FDM-FDCP is designed to operate in low-delay, high-Doppler environments; we discuss maximum delay spread that our waveform can tolerate. All modulation and demodulation operations used in this work are accomplished in O(N N) time complexity, implying that FDM-FDCP is suitable for real-time signal processing in underwater channels.
我们提出了FDM-FDCP波形的扩展,并演示了该波形在AWGN存在下的水声信道中的性能。在这个扩展中,我们简单地用保护带替换频域循环前缀,类似于补零OFDM。我们论证并提供了经验证据,证明这种方法实际上可以提高性能。FDM-FDCP设计用于低延迟、高多普勒环境;我们讨论了波形所能容忍的最大延迟扩展。本研究中所有调制解调操作的时间复杂度均为0 (N N),表明FDM-FDCP适用于水下信道的实时信号处理。
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引用次数: 3
Limited Complexity Optimization of the Uplink Performance in Cloud Cellular Networks 云蜂窝网络中上行链路性能的有限复杂度优化
S. Govindasamy, I. Bergel
We consider a cooperative cellular network where the signal from a mobile is detected jointly by base stations close to it using a minimum-mean-square-error (MMSE) estimator. We assume a network where different numbers of cooperating base stations can be used for the detection of each mobile. We also assume that all signals are delivered to a processing center which has limited computational capabilities. We present an upper bound on the achievable weighted sum rate for a given computational complexity. We also derive a simple and practical optimization scheme that is based on asymptotic results for the spectral efficiency of a typical link in a Poison point process model. The derived scheme results in a computational savings over schemes that use a fixed number of cooperating base stations for each mobile. The suggested scheme also enables an easy tuning of the computational complexity, according to system needs and energy requirements.
我们考虑一个合作蜂窝网络,其中来自移动设备的信号由靠近它的基站使用最小均方误差(MMSE)估计器共同检测。我们假设有一个网络,其中可以使用不同数量的合作基站来检测每个移动设备。我们还假设所有的信号都被传送到一个计算能力有限的处理中心。对于给定的计算复杂度,我们给出了可实现的加权和速率的上界。我们还推导了一个简单实用的优化方案,该方案基于一个典型环节的谱效率的渐近结果。所导出的方案比为每个移动设备使用固定数量的合作基站的方案节省了计算量。建议的方案还可以根据系统需求和能源需求轻松调整计算复杂度。
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引用次数: 0
Secure Storage for Identification 身份识别的安全存储
Sebastian Baur, C. Deppe, H. Boche
Ahlswede and Dueck introduced identification via channels as a new paradigm in information theory. They showed that the number of messages that can reliably be identified over a noisy channel grows doubly exponentially with the block length. In this work we also consider identification, but we assume that messages are stored on a database such that they can be identified. Additionally the legitimate users have access to the output of a source. This source allows us to store messages securely. It is also used to increase the number of messages that can be stored securely on the database and identified reliably. We define a protocol for secure storage for identification such that the number of stored messages that can be identified grows doubly exponentially with the number of symbols read from the source and the number of storage cells available respectively. We also consider the privacy leakage of the protocols used for identification. As a by-product we also get new results on common randomness generation.
Ahlswede和Dueck将通过渠道识别作为信息论的新范式。他们表明,可以在噪声信道上可靠地识别的消息数量随着块长度呈双指数增长。在这项工作中,我们还考虑识别,但我们假设消息存储在数据库中,以便可以识别它们。此外,合法用户可以访问源的输出。这个源允许我们安全地存储消息。它还用于增加可以安全地存储在数据库上并可靠地识别的消息的数量。我们定义了一种用于标识的安全存储协议,使得可以标识的存储消息的数量随着从源读取的符号数量和可用的存储单元数量分别呈指数倍增长。我们还考虑了用于识别的协议的隐私泄露。作为一个副产品,我们也得到了关于普通随机性生成的新结果。
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引用次数: 4
期刊
2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)
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