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2021 Advanced Communication Technologies and Signal Processing (ACTS)最新文献

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Development of a Learning-aid tool using Hand Gesture Based Human Computer Interaction System 基于手势的人机交互系统辅助学习工具的开发
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708354
Bidyut Jyoti Boruah, A. K. Talukdar, K. K. Sarma
A hand gesture recognition system is a natural and simple way of communicating in today’s world. The development of teaching methods by using technology-dependent useful items to increase communication and interaction between the teacher and the student is a major part of today’s e-learning. In this paper, we have proposed an interactive learning-aid tool based on a vision-based hand gesture recognition system. The system uses MediaPipe for hand gesture recognition. The recognized hand gestures use a virtual-mouse-based object controlling system to control various virtual objects created using Unity. The system has been tested using six hand gestures and it is found that the system can be used effectively for controlling various virtual objects.
在当今世界,手势识别系统是一种自然而简单的交流方式。通过使用依赖于技术的有用项目来增加教师和学生之间的交流和互动的教学方法的发展是当今电子学习的主要组成部分。本文提出了一种基于视觉手势识别系统的交互式学习辅助工具。该系统使用MediaPipe进行手势识别。识别手势使用基于虚拟鼠标的对象控制系统来控制使用Unity创建的各种虚拟对象。通过六种手势对系统进行了测试,发现该系统可以有效地用于控制各种虚拟物体。
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引用次数: 6
ADMM based Deep Denoiser Prior for Enhancing Single Coil Magnitude MR images 基于ADMM的单圈磁共振图像深度去噪先验增强
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708111
Aneeta Christopher, R. Harikishan, P. Sudeep
Recently, deep learning methods are employed for image restoration tasks. An unsupervised learning technique is appropriate for many real time applications due to the scarcity of a large amount of data for training. The conventional deep image prior (DIP) is a CNN based denoiser prior that perform different image restoration tasks by using only a single degraded image. Alternating Direction Method of Multipliers (ADMM) framework over a standard sub-gradient method has already been proposed with DIP method. Inspired by this, we propose a variant of ADMM-DIP method for enhancing single coil magnitude magnetic resonance (MR) images. It is well known that the noise distribution in single coil magnitude MR images is stationary Rician. We achieve the Rician noise removal from single MR image by utilizing the combined effect of MSE, KL divergence and perceptual loss functions. Also, the attention guided dense upsampling network (AUNet) was engaged as the CNN denoiser prior. Our experiments on simulated MR images indicate a better performance of the proposed method. We evaluated different denoising methods both qualitatively and quantitatively.
最近,深度学习方法被用于图像恢复任务。由于缺乏大量的训练数据,无监督学习技术适用于许多实时应用。传统的深度图像先验(DIP)是一种基于CNN的去噪先验,仅使用单个退化图像执行不同的图像恢复任务。基于标准次梯度法的交替方向乘法器(ADMM)框架已经提出了DIP法。受此启发,我们提出了一种ADMM-DIP方法的变体,用于增强单线圈量级的磁共振(MR)图像。众所周知,单线圈级磁共振图像的噪声分布是平稳的。利用MSE、KL散度和感知损失函数的综合作用,实现了对单幅MR图像的去噪。采用注意力引导密集上采样网络(AUNet)作为CNN去噪先验。在模拟MR图像上的实验表明,该方法具有较好的性能。我们从定性和定量两方面评价了不同的去噪方法。
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引用次数: 1
Study of Substrate Integrated Waveguide Fed Slot Antenna for Ka Band Application Ka波段基板集成波导馈电槽天线的研究
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708154
A. Singh, R. Chandan, S. Pal
This paper presents a parametric analysis of a substrate integrated waveguide fed slot antenna for Ka-band application. The slot’s comprehensive behavior and its resonance frequency dependence on its dimension, translational and rotational position, have been analyzed. The optimal return loss for the microstrip to SIW transition has been investigated by maximizing the tapering dimension for the Ka-band of operation by using a commercial 3D electromagnetic CST Microwave Studio Design Suit. The slot antenna resonates at various frequencies following parametric variation. For the study, 27.74 GHz resonance points have been considered, as it comes under the 28 GHz band spectrum. For this bandwidth, the broadside gain is more than 6 dB. Radiation efficiency typically stays over 75 percent across the whole operating band. The co-polarization to cross-polarization deviation for both XZ and YZ planes is more than 40 dB at the resonance point.
本文对一种用于ka波段的基片集成波导馈电缝隙天线进行了参数分析。分析了槽的综合性能及其共振频率与槽的尺寸、平移位置和旋转位置的关系。利用商业3D电磁CST微波工作室设计套装,通过最大化ka波段操作的锥形尺寸,研究了微带到SIW转换的最佳回波损耗。槽形天线随参数变化在不同频率下产生共振。本研究考虑了27.74 GHz的谐振点,因为它属于28ghz频段频谱。对于这个带宽,宽频增益大于6db。在整个工作波段,辐射效率通常保持在75%以上。在谐振点处,XZ和YZ平面的共极化与交叉极化偏差均大于40 dB。
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引用次数: 0
Adaptive Kernelized Subfilter Nonlinear AEC Algorithm 自适应核化子滤波非线性AEC算法
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708184
Srikanth Burra, Asutosh Kar
The acoustic echo canceller developed based on a linear echo path suffers performance degradation due to distortion induced by the electronic components in hands-free devices. Recently kernel-based approach is proposed to minimize the effects of distortion. Here, the distortion is modeled using the kernel method. However, there exists a scope to further enhance the performance of echo cancellers. In this work, we propose an improved variant of the kernel approach for enhancing the performance by maintaining a better trade-off between the rate of convergence and steady-state. Simulation results show that the proposed approach was able to perform better than the existing kernel method in minimizing the impact of the sigmoidal-based saturation distortion on the echo cancellation performance.
基于线性回波路径开发的声回波消除器由于免提设备中电子元件引起的失真而导致性能下降。最近提出了一种基于核的方法来最小化失真的影响。在这里,使用核方法对失真进行建模。但是,回波消除器的性能还有进一步提高的空间。在这项工作中,我们提出了一种改进的核方法,通过在收敛速度和稳态之间保持更好的权衡来提高性能。仿真结果表明,该方法在最大限度地减少基于s型模的饱和失真对回波抵消性能的影响方面优于现有的核方法。
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引用次数: 0
Recent Trends in Terahertz Communication: Applications and Open Research Problems 太赫兹通信的最新趋势:应用和开放研究问题
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708383
Anusaya Swain, S. Hiremath, Koushik Batchu, Vijay Kumar
Over the past years, the demand to meet the bandwidth requirement forces us to increase the carrier frequency used for wireless communication. To fulfill the rapid increase of mobile data demand the research community addressed the development of wide radio bands such as millimeter wave (mmW) frequencies and others were attracted towards the optical communication frequency which allowed high data rates, better physical security, and avoids the interference of electromagnetic waves. With an exponential rise in the data traffic the terahertz frequency band seems to be promising to support the next generation wireless network beyond fifth-generation (5G) as well as bridging a gap between optical frequency range and millimeter wave frequency range. This paper provides a review on key technologies encountered in THz wireless communication systems such as channel modeling, beamforming, and beam tracking using Massive MIMO and use of artificial intelligence (AI) based framework to meet the future demands for future generation networks and also provide a case study on THz channel modeling using the machine learning technique. It also throws light on the challenges faced in THz communication.
在过去的几年里,满足带宽需求的需求迫使我们增加了用于无线通信的载波频率。为了满足快速增长的移动数据需求,研究界致力于毫米波(mmW)频率等宽无线电频段的发展,而光通信频率则被吸引,因为光通信频率具有高数据速率,更好的物理安全性,并且避免了电磁波的干扰。随着数据流量的指数级增长,太赫兹频段似乎有望支持第五代(5G)以上的下一代无线网络,并弥合光频率范围和毫米波频率范围之间的差距。本文综述了太赫兹无线通信系统中遇到的关键技术,如信道建模、波束成形和波束跟踪,使用大规模MIMO和使用基于人工智能(AI)的框架来满足下一代网络的未来需求,并提供了一个使用机器学习技术进行太赫兹信道建模的案例研究。它还揭示了太赫兹通信面临的挑战。
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引用次数: 0
Passive RFID Transponders Based on SRR and Koch-island Fractal for Bit-Coding Enhancement 基于SRR和Koch-island分形的无源RFID应答器的比特编码增强
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708360
Durga Prasad Mishra, S. Behera
To date, Chipless Radio Frequency Identification (RFID) has become one of the prominent methods for identifying and detecting objects. The advantage of tagging technology over optical barcodes is that it does not rely on line-of-sight communication. In this paper, the design, simulation, and fabrication of chipless RFID transponders, based on the square Split-Ring Resonators (SRR) and the Koch-island fractal of the third iteration are analyzed. The Radar Cross Section (RCS) and frequency coding techniques are investigated along with a comparison, showing the vital features like physical footprint and spatial density etc. of the transponders. It leads to the cost reduction in tag manufacturing which is suitable for mass industrial production. The maximum RCS are found to be −20.90 dBsm and −25.6 dBsm for transponders 1 and 2 respectively. The spatial densities are found to be 0.125 bits/mm2 for tag 1 and 0.041 bits/mm2 for tag 2.
迄今为止,无芯片射频识别(RFID)已成为识别和检测物体的重要方法之一。与光学条形码相比,标签技术的优势在于它不依赖于视距通信。本文分析了基于方形劈裂环谐振器(SRR)和第三次迭代科赫岛分形的无芯片RFID应答器的设计、仿真和制作。雷达横截面(RCS)和频率编码技术进行了研究,并进行了比较,显示了应答器的物理足迹和空间密度等重要特征。从而降低了吊牌制造的成本,适合大规模工业生产。应答器1和应答器2的最大RCS分别为- 20.90 dBsm和- 25.6 dBsm。标签1的空间密度为0.125 bits/mm2,标签2的空间密度为0.041 bits/mm2。
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引用次数: 1
TQWT based Electrocardiogram Compression using Optimized Thresholding 基于优化阈值的TQWT心电图压缩
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708289
H. Pal, Adarsh Kumar, A. Vishwakarma
The electrocardiogram (ECG) is a salient signal that is commonly utilized to diagnose heart patients. The recording of ECG signals generates a large amount of data when continuous monitoring of the heart is necessary. Hence, there is a strong motivation to develop a suitable compression technique to minimize bandwidth and memory requirements. In this context, this work proposes a compression technique using tunable-Q wavelet transform (TQWT) and an optimized dead-zone quantizer (ODZQ). The TQWT is used for the decomposition of ECG signal and DZQ for thresholding and quantization. The swarm-based method, particle swarm optimization (PSO) is used to obtain the optimized threshold values. The compressed signal is obtained by thresholding, quantization, and encoding of quantized coefficients. Encoding is performed by utilizing run-length encoding (RLE), which helps to achieve further compression. The proposed method is assessed using percentage-root-mean square difference (PRD), compression ratio (CR), and quality score (QS). The obtained results from the proposed method are CR=17.2553, PRD=2.9360, and QS=6.4354.
心电图(ECG)是一种常用的诊断心脏病的重要信号。当需要对心脏进行连续监测时,心电信号的记录会产生大量的数据。因此,有强烈的动机开发一种合适的压缩技术,以最小化带宽和内存需求。在此背景下,本工作提出了一种使用可调q小波变换(TQWT)和优化死区量化器(ODZQ)的压缩技术。用TQWT对心电信号进行分解,用DZQ进行阈值化和量化。采用基于群体的粒子群算法(PSO)获得优化后的阈值。压缩信号是通过阈值化、量化和量化系数编码得到的。编码通过使用运行长度编码(RLE)来执行,这有助于实现进一步的压缩。采用百分比-均方根差(PRD)、压缩比(CR)和质量评分(QS)对所提出的方法进行评估。所得结果CR=17.2553, PRD=2.9360, QS=6.4354。
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引用次数: 5
Traffic-Aware UAV Placement Strategies for Load Balancing in 5G Cellular Hotspots 基于流量感知的5G蜂窝热点负载均衡无人机布局策略
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708242
Byomakesh Mahapatra, Anuradha Verma, Deepika Gupta, Pankaj Sharma, A. K. Turuk
In the fifth-generation (5G) network, dependency on the cellular platforms increases due to an increase in the number of cellular and wireless devices. In such network, a hotspot situation arises when the user density goes beyond the threshold capacity. To reduce the load of this hotspot we have proposed a traffic-aware proactive load balancing (TPLBA) strategy. This strategy used a feedback approach to monitor and control the traffic load at the cellular base station or gNodeB. When the traffic load goes beyond a certain value, the main control unit (MCU) present at the base band unit (BBU) takes preventive actions by putting one or more number of F-RRHs at the probable hotspot. These F-RRH share the traffic load of the gNB to maintain the quality-of-service (QoS) of the cellular network. To implement the proposed strategy, we have used Tu-Vienna LTE simulator. Further, the simulation results show that the proposed TPLBA algorithm significantly improves the QoS by improving UE throughput, UE spectral efficiency, and blocking probability.
在第五代(5G)网络中,由于蜂窝和无线设备数量的增加,对蜂窝平台的依赖性增加。在这种网络中,当用户密度超过阈值容量时,就会出现热点现象。为了减少该热点的负载,我们提出了一种流量感知的主动负载平衡(TPLBA)策略。该策略使用反馈方法来监视和控制蜂窝基站或gndeb上的流量负载。当业务负载超过一定值时,BBU (base band unit)所在的MCU (main control unit)通过在可能的热点位置放置一个或多个f - rrh来采取预防措施。这些F-RRH分担gNB的流量负载,以维持蜂窝网络的QoS (quality-of-service)。为了实现所提出的策略,我们使用了Tu-Vienna LTE模拟器。仿真结果表明,TPLBA算法通过提高UE吞吐量、UE频谱效率和阻塞概率,显著提高了QoS。
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引用次数: 3
Energy Consumption Evaluation of LoRa Sensor Nodes in Wireless Sensor Network 无线传感器网络中LoRa传感器节点能耗评估
Pub Date : 2021-12-15 DOI: 10.1109/ACTS53447.2021.9708341
M. Philip, Poonam Singh
The battery life of sensor nodes in a wireless sensor network (WSN) is usually limited. In most Internet of Things (IoT) applications, sensor nodes must operate reliably for a longer duration. Energy efficiency is crucial for extending the lifetime of sensor nodes. In addition, the radio settings should withstand a better data rate transmission while maintaining energy efficiency. LoRa/LoRaWAN is a low-power wide-area network (LPWAN) technology that has recently received a lot of interest. This work proposes a LoRa-based energy consumption model that can be used to estimate the amount of energy each sensor node element in a WSN consumes. The effect of sensing interval and spreading factor on battery lifetime is discussed to determine its effects, when used for field application.
无线传感器网络(WSN)中传感器节点的电池寿命通常是有限的。在大多数物联网(IoT)应用中,传感器节点必须可靠地运行更长时间。能源效率是延长传感器节点寿命的关键。此外,无线电设置应承受更好的数据速率传输,同时保持能源效率。LoRa/LoRaWAN是一种低功耗广域网(LPWAN)技术,最近受到了很多关注。本文提出了一种基于lora的能量消耗模型,该模型可用于估计WSN中每个传感器节点元素消耗的能量。讨论了传感间隔和扩频因子对电池寿命的影响,以确定其在现场应用时的影响。
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引用次数: 5
[ACTS 2021 Front cover] [act 2021封面]
Pub Date : 2021-12-15 DOI: 10.1109/acts53447.2021.9708304
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引用次数: 0
期刊
2021 Advanced Communication Technologies and Signal Processing (ACTS)
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