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2019 28th Wireless and Optical Communications Conference (WOCC)最新文献

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Latency Optimization for Multi-user NOMA-MEC Offloading Using Reinforcement Learning 基于强化学习的多用户NOMA-MEC卸载延迟优化
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770605
Peitong Yang, Lixin Li, Wei Liang, Huisheng Zhang, Z. Ding
Both non-orthogonal multiple access (NOMA) and mobile edge computing (MEC) have been recognized as important techniques in future wireless networks, and the combination of them has received attention recently. It has been demonstrated that in a dual-user scenario, the use of the NOMA can effectively reduce the latency and energy consumption of MEC offloading. However, the scenario of multiple users needs to be considered further, which is more practical. In this paper, we consider a NOMA-MEC system with multiple users and single MEC server, and investigate the problem of minimizing offloading latency. Through using the Reinforcement learning (RL) algorithm Deep Q-network (DQN) to select the users who offload at the same time without knowing the actions of other users in advance, we will obtain the optimal user combination state and minimize system offloading latency. Simulation results show that the proposed method can significantly reduce the system offloading latency in the multi-user scenario of applying NOMA to MEC.
非正交多址(NOMA)和移动边缘计算(MEC)都被认为是未来无线网络的重要技术,它们的结合近年来受到了人们的关注。研究表明,在双用户场景下,使用NOMA可以有效地降低MEC卸载的延迟和能耗。但是,多用户的场景需要进一步考虑,这更实际。本文考虑了一个多用户、单MEC服务器的NOMA-MEC系统,研究了最小化卸载延迟的问题。通过使用强化学习(RL)算法Deep Q-network (DQN)在不事先知道其他用户动作的情况下选择同时卸载的用户,得到最优的用户组合状态,最小化系统卸载延迟。仿真结果表明,在多用户场景下,该方法可以显著降低系统卸载延迟。
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引用次数: 27
Generalized Spatial Modulation for Multi-User in Visible Light Communication 可见光通信中多用户的广义空间调制
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770618
M. Jha, Navin Kumar, Y. Lakshmi
In this paper, we analyzed the generalized spatial modulation (generalized SM) transmission technique for multi user indoor visible light communication (VLC) system. In generalized SM, number of bits conveyed per transmitter includes modulation symbol bits and active transmitter indices bits. Block diagonalization (BD) precoding technique is used to avoid multi user interference (MUI) in the transmitter without interference between photodiodes of the same user resulting in the noise reduction. A comparison is performed between the generalized SM with conventional Multiple Input Multiple Output (MIMO), spatial multiplexing (SMP) MIMO and spatial modulation MIMO transmission technique for multi user VLC system with regard to bit error rate (BER) performance using simulation. Simulation results show that generalized SM MIMO technique offers better signal to noise ratio (SNR) than SM MIMO by 2 dB, SMP MIMO by 5 dB and conventional MIMO technique by 8.5 dB to achieve the same BER of 10−6. We also analyzed the influence of field of view (FOV) at an optical receiver on SNR performance with respect to single light emitting diode (LED) power.
本文分析了多用户室内可见光通信(VLC)系统的广义空间调制(广义SM)传输技术。在广义SM中,每个发射机传输的比特数包括调制符号比特和主动发射机索引比特。块对角化(BD)预编码技术用于避免发射机中的多用户干扰(MUI),而不会导致同一用户的光电二极管之间的干扰,从而降低噪声。通过仿真比较了多用户VLC系统中广义SM与传统多输入多输出(MIMO)、空间复用(SMP) MIMO和空间调制MIMO传输技术在误码率(BER)方面的性能。仿真结果表明,广义SM MIMO技术的信噪比(SNR)比SM MIMO提高了2 dB,比SMP MIMO提高了5 dB,比传统MIMO提高了8.5 dB,达到10−6的误码率。我们还分析了光接收器的视场(FOV)对单个发光二极管(LED)功率的信噪比性能的影响。
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引用次数: 4
TOA based Target Tracking using Optimal Estimation Methods 基于TOA的最优估计目标跟踪方法
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770656
Shihong Duan, Yuanyuan Li, Cheng Xu, Jiawang Wan, Jie He
Position is one of the essential attributes of an object. With the development of wireless communication and ranging technology, localization algorithms should also been investigated to improve its accuracy. Ultra Wideband (UWB) has the potentials of low cost and high precision. However, its accuracy is susceptible to environment, such as non-line-of-sight conditions. There is a pressing need for a suitable algorithm to reduce the impact of ranging errors, and ensure the performance of the positioning systems when the ranging error varies.
位置是物体的基本属性之一。随着无线通信和测距技术的发展,需要研究定位算法来提高定位精度。超宽带(UWB)具有低成本、高精度的潜力。然而,其精度容易受到环境的影响,例如非视线条件。迫切需要一种合适的算法来减小测距误差的影响,并保证测距误差变化时定位系统的性能。
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引用次数: 0
Traffic Classification for Mobile Video Streaming Using Dynamic Warping Network 基于动态翘曲网络的移动视频流流量分类
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770669
Shuang Tang, Chensheng Li, Xiaowei Qin, Guo Wei
Traditional traffic classification methods generally sort the Internet traffic for video streaming to the same category. However, video streaming should be treated differently according to different streaming techniques for the task of QoE evaluation. Meanwhile, end-to-end encryption and different encrypted forms make traffic classification even more challenging because of insufficient distinguishable characteristics. In this work, we propose a novel Dynamic Warping Network (DWN) model that allows us to differentiate different streaming techniques based on traffic patterns. We compute soft Dynamic Time Warping (DTW) distances between the download speed series and a set of warping series, which are further fed to Multi-Layer Perceptions (MLP) for traffic classification. We also show how to train the MLP and warping series jointly using back-propagation algorithm. The proposed model outperforms the start-of-the-art MaMPF model for distinguishing Internet traffic between different streaming techniques, where the accuracy for Video on Demand (VoD) using HTTP Adaptive Streaming (HAS) and live broadcasting (LB) reaches 90.51% and 88.84% respectively.
传统的流量分类方法一般是将视频流的互联网流量分类到同一类。然而,对于QoE评价任务,视频流应该根据不同的流技术进行不同的处理。同时,端到端加密和不同的加密形式使流量分类变得更加困难,因为它们缺乏可区分的特征。在这项工作中,我们提出了一种新的动态翘曲网络(DWN)模型,该模型允许我们根据流量模式区分不同的流技术。我们计算下载速度序列和一组扭曲序列之间的软动态时间扭曲(DTW)距离,并将其进一步馈送到多层感知(MLP)进行流量分类。我们还展示了如何使用反向传播算法联合训练MLP和翘曲序列。该模型在区分不同流媒体技术之间的互联网流量方面优于最先进的MaMPF模型,其中使用HTTP自适应流媒体(HAS)和直播(LB)的视频点播(VoD)的准确率分别达到90.51%和88.84%。
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引用次数: 2
High energy efficient relay adaptive transmission strategy 高能效继电器自适应传输策略
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770682
Shu Gui, Runhe Qiu
This Cooperative relay technology has been widely studied, but the energy efficiency (EE) of relay transmission system is not always higher than that of direct transmission system. In this paper, the EEs of the direct transmission (DT) mode, the One - way relay transmission (OWRT) mode and the two-way relay transmission (TWRT) mode in different channel fading conditions are studied, and the expressions of EE are obtained. Comparing to the EEs of the three transmission modes under different channel fading, the system adaptively selects the transmission mode with higher EE according to the actual data transmission rate. Simulation results show that, compared to the traditional transmission mode, the proposed energy-efficient relay adaptive transmission strategy greatly improves the EE of the relay transmission system.
这种协同中继技术得到了广泛的研究,但中继传输系统的能效并不总是高于直接传输系统。本文研究了直接传输(DT)模式、单向中继传输(OWRT)模式和双向中继传输(TWRT)模式在不同信道衰落条件下的EE,得到了EE的表达式。对比三种传输方式在不同信道衰落下的EE,系统根据实际数据传输速率自适应选择EE较高的传输方式。仿真结果表明,与传统的传输方式相比,所提出的节能中继自适应传输策略大大提高了中继传输系统的能效。
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引用次数: 1
Simultaneously Power and Information Transmission for Half-duplex Massive MIMO with Spatial Basis Expansion Model 基于空间基扩展模型的半双工大规模MIMO功率与信息同步传输
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770621
Na Li, Dongmei Zhang, Wei Xie, Meng Wang, Kui Xu, Jianhui Xu, Qingsong Zhang
In this paper, we consider the beam-domain time-switching (TS) simultaneous wireless information and power transfer (SWIPT) protocol design in half-duplex (HD) massive multiple-input multiple-output (MIMO) system, where the sensors are uniformly distributed in its coverage area. In order to reduce the computational complexity, we propose spatial basis expansion model (SBEM) with rotation angle to improve the performance of SWIPT technology. In the proposed scheme, the transmit time interval is decomposed to three subintervals, the duration of each subinterval is optimized to maximize the system spectrum efficiency.
本文研究了半双工(HD)海量多输入多输出(MIMO)系统中传感器均匀分布的波束域时间切换(TS)同步无线信息与功率传输(SWIPT)协议设计。为了降低计算复杂度,我们提出了带有旋转角度的空间基展开模型(SBEM)来提高SWIPT技术的性能。该方案将发射时间区间分解为三个子区间,并对每个子区间的持续时间进行优化,使系统的频谱效率最大化。
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引用次数: 0
A Fast-Convergent Detector Based on Joint Jacobi and Richardson Method for Uplink Massive MIMO Systems 基于联合Jacobi和Richardson方法的快速收敛检测器用于上行海量MIMO系统
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770631
I. A. Khoso, T. Javed, Shanshan Tu, Yuanyuan Dong, Hua Li, Xiyuan Wang, Xiaoming Dai
Minimum mean squared error (MMSE) detector achieves near-optimal error rate performance for massive multiple-input multiple-output (M-MIMO) systems but involves large-scale matrix inversion operations with high complexity. Therefore, several approximated matrix inversion algorithms have been proposed. However, their convergence turns out to be very slow. In this paper, a new approach based on joint Jacobi and Richardson method is proposed. We show that the proposed method accelerate the convergence rate at low-complexity for different base station (BS)-to-user-antenna ratio (BUAR). Moreover, a promising initial estimate is utilized to achieve closer-to-optimal initialization for the proposed method. To further accelerate the convergence rate, we introduce a new approximated-eigenvalue based relaxation parameter. The convergence proof of the proposed algorithm is also provided in this work. We analyze the computational complexity of different methods and demonstrate the performance differences with numerical simulations.
最小均方误差(MMSE)检测器在大规模多输入多输出(M-MIMO)系统中实现了接近最优的误差率性能,但涉及大规模矩阵反演操作,且复杂度高。因此,提出了几种近似矩阵反演算法。然而,它们的收敛速度非常慢。本文提出了一种基于Jacobi和Richardson联合方法的求解方法。结果表明,该方法在不同的基站与用户天线比(BUAR)条件下,在低复杂度下加快了收敛速度。此外,利用一个有希望的初始估计来实现所提出方法的更接近最优的初始化。为了进一步加快收敛速度,我们引入了一个新的基于近似特征值的松弛参数。本文还给出了算法的收敛性证明。分析了不同方法的计算复杂度,并通过数值模拟验证了其性能差异。
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引用次数: 5
Deep Learning based Automatic Modulation Classification for Varying SNR Environment 基于深度学习的变信噪比自动调制分类
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770611
Xiaojuan Xie, Yanqin Ni, Shengliang Peng, Yu-dong Yao
Automatic modulation classification (AMC) is a crucial task for various communications applications. Deep learning (DL) based classifier is emerging as a prevalent choice for AMC. Previous research on DL based AMC usually assumes an environment of fixed signal to noise ratio (SNR). This paper considers DL based AMC for varying SNR environment. Two algorithms, including M2M4-aided algorithm and multi-label DL based algorithm, are proposed to combat the varying SNR. The former utilizes an M2M4 estimator to estimate SNR, according to which a proper trained DL model can be selected for AMC. The latter exploits multi-label DL to train a model, with which SNR scenario and modulation type can be inferred simultaneously. Experiment results show that the performance of both algorithms is fairly close to that of DL based AMC under fixed SNR environment.
自动调制分类(AMC)是各种通信应用中的一项重要任务。基于深度学习(DL)的分类器正在成为AMC的普遍选择。以往基于深度学习的AMC研究通常假设一个固定信噪比的环境。本文研究了在变信噪比环境下基于深度学习的AMC算法。针对不同的信噪比,提出了m2m4辅助算法和基于多标签深度学习的算法。前者利用M2M4估计器估计信噪比,根据信噪比选择合适的训练好的深度学习模型进行AMC。后者利用多标签深度学习训练模型,可以同时推断信噪比场景和调制类型。实验结果表明,在固定信噪比环境下,两种算法的性能都与基于深度学习的AMC相当接近。
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引用次数: 18
Real-time Sound Detection and Regeneration Based on Optical Flow Algorithm of Laser Speckle Images 基于激光散斑图像光流算法的实时声音检测与再生
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770661
Nan Wu, S. Haruyama
Sound detection with optical means is an appealing research topic. Laser speckle is one effective method to detect the sound due to its sensitivity to tiny motion. The traditional laser-speckle sound recovery methods require a high-speed camera to record fast-moving speckle images and then recover the original sound signals from the motion information of the captured speckle images. In this manuscript, a laser microphone system is proposed to detect and regenerate the sound signal in real time. In the proposed system, only a small part of the imaging sensor is used to ensure a high sampling rate with a common industrial camera and reduce the computation time consumption. Meanwhile, optical flow algorithm is employed to obtain the motion information of captured speckle images and regenerate the sound. These two points allow us to capture images from the camera and regenerate sound in real time without storing any data into the computer, which greatly increases the speed of the system and achieves a microphone-like functions. Experiments are conducted to show that the proposed system can detect and regenerate the sound signal in real-time with a high quality.
用光学手段检测声音是一个很有吸引力的研究课题。激光散斑对微小运动的敏感性使其成为一种有效的声音探测方法。传统的激光散斑声音恢复方法需要高速摄像机记录快速运动的散斑图像,然后从捕获的散斑图像的运动信息中恢复原始声音信号。本文提出了一种激光传声器系统,用于实时检测和再生声音信号。在该系统中,仅使用了一小部分成像传感器,以保证与普通工业相机相同的高采样率,并减少了计算时间。同时,利用光流算法获取采集到的散斑图像的运动信息,重新生成声音。这两点使我们可以在不向计算机中存储任何数据的情况下,从相机中实时捕捉图像并重新生成声音,从而大大提高了系统的速度,实现了类似麦克风的功能。实验结果表明,该系统能够实时检测并生成高质量的声音信号。
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引用次数: 5
Study on the Detecting Technology of Mine Internet of Things Based on RSSI Technology 基于RSSI技术的矿山物联网检测技术研究
Pub Date : 2019-05-01 DOI: 10.1109/WOCC.2019.8770663
Jian Ming, Aibing Jin, Jinhai Sun, D. Hu, Yan Xia
Based on the theory and technology of Internet of Things(IOT) and digital mine, the Mine Internet of Things (perception Mine) is used to detect and control of the personnel, equipment and mine environment, which can improve the ability of perceiving the operation status of the personnel and the equipment and controlling risks in mining production. Field experiments of RSSI distance measurement were conducted on account of characteristics of the operational environment and engineering arrangements of the underground mine. In view of field experiments results, the RSSI-distance relation model was established. The trilateration positioning model and BP neural network positioning model were used to process and analyze the node positioning data. The mine cave-back monitoring method based on RSSI distance measurement is introduced.
矿山物联网(感知矿山)是基于物联网(IOT)和数字矿山的理论和技术,对人员、设备和矿山环境进行检测和控制,提高对矿山生产中人员和设备运行状态的感知能力和风险控制能力。结合井下作业环境特点和工程布置,进行了RSSI测距的现场试验。根据现场试验结果,建立了rssi -距离关系模型。采用三边定位模型和BP神经网络定位模型对节点定位数据进行处理和分析。介绍了一种基于RSSI距离测量的矿山塌方监测方法。
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引用次数: 0
期刊
2019 28th Wireless and Optical Communications Conference (WOCC)
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