The ... IEEE Annual Wireless and Microwave Technology Conference. IEEE Annual Wireless and Microwave Technology Conference最新文献

英文中文

UHF RFID tag localization using pattern reconfigurable reader antenna. 使用模式可重构阅读器天线的超高频RFID标签定位。

The ... IEEE Annual Wireless and Microwave Technology Conference. IEEE Annual Wireless and Microwave Technology Conference

Pub Date : 2022-04-01 DOI: 10.1109/wamicon53991.2022.9786069

Md Shakir Hossain, Md Abu Saleh Tajin, Kapil R Dandekar

Passive ultra high frequency (UHF) radio frequency identification (RFID) tags have the potential to find ubiquitous use in indoor object tracking, localization, and contact tracing. We propose a machine learning-based method for RFID indoor localization using a pattern reconfigurable UHF RFID reader antenna array. The received signal strength indicator (RSSI) values (from 10,000 tags) recorded at the reader antenna units are used as features to evaluate the machine learning models with a train-test split of 75%-25%. The training and testing data is generated by a wireless ray tracing simulator. Five machine learning models: random forest regressor, decision tree regressor, Nu support vector regressor, $k$ nearest regressor, and kernel ridge regressor are compared. Random forest regressor has the lowest localization error both in terms of average Euclidean distance (AED) and root-mean-square error (RMSE). For random forest regressor, localization error results show that 90% of the tags are within 1 meter of their true position, and 67% are within 50 cm of their true position based on Euclidean distance.

无源超高频(UHF)射频识别(RFID)标签有可能在室内物体跟踪，定位和接触追踪中无处不在。我们提出了一种基于机器学习的RFID室内定位方法，使用模式可重构的UHF RFID读取器天线阵列。在读取器天线单元记录的接收信号强度指标(RSSI)值(来自10,000个标签)被用作特征，以75%-25%的训练测试分割来评估机器学习模型。训练和测试数据由无线射线追踪模拟器生成。比较了随机森林回归器、决策树回归器、Nu支持向量回归器、k最近回归器和核脊回归器五种机器学习模型。随机森林回归量在平均欧氏距离(AED)和均方根误差(RMSE)方面具有最低的定位误差。对于随机森林回归器，定位误差结果显示，基于欧氏距离，90%的标签距离真实位置在1米以内，67%的标签距离真实位置在50厘米以内。

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引用次数: 3

Channel Emulation for the Characterization of Wearable RFID Systems. 用于鉴定可穿戴式 RFID 系统的信道仿真。

The ... IEEE Annual Wireless and Microwave Technology Conference. IEEE Annual Wireless and Microwave Technology Conference

Pub Date : 2021-04-01 Epub Date: 2021-06-03 DOI: 10.1109/wamicon47156.2021.9443623

Md Abu Saleh Tajin, Marko Jacovic, William Mongan, Kapil R Dandekar

Wearable sensors with RFID (Radio Frequency Identification) tags are considered to be an integral part of the upcoming revolution in the IoT (Internet of Things) sector. As with many deployed IoT sensor systems, dynamic environment conditions present challenges in reliably measuring system performance; this difficulty is enhanced due to proprietary details about the sensors, such as an RFID chip embedded within a novel knitted antenna acting as a passive sensor. A repeatable and scalable platform is necessary to evaluate the performance of the entire system in the pre-deployment stage in order to compare the predicted effects of varying components, design, and integration of sensors in an integrated IoT device. This paper demonstrates the development of an RFID channel emulation testbed in the United States ISM band (902-928 MHz). The testbed includes a commercial RFID interrogator, a custom-built circuit board housing a commercial passive RFID chip, and a dynamic spectrum environment emulator (DYSE) for wireless channel emulation. A single link scenario was considered where the DYSE emulates the antenna gain fluctuation due to the sensing of breathing with a fabric-based RFID. Two regular and one irregular breathing scenarios were emulated, and breathing rate or anomaly was detected from post-processed RSSI (Received Signal Strength Indicator) data received by the RFID interrogator.

带有 RFID（射频识别）标签的可穿戴传感器被认为是即将到来的物联网（IoT）领域革命中不可或缺的一部分。与许多已部署的物联网传感器系统一样，动态环境条件给可靠地测量系统性能带来了挑战；由于传感器的专有细节（如嵌入在新型针织天线内的 RFID 芯片充当无源传感器），这种难度进一步加大。有必要建立一个可重复、可扩展的平台，以评估整个系统在部署前阶段的性能，从而比较不同组件、设计和集成传感器在集成物联网设备中的预测效果。本文展示了美国 ISM 频段（902-928 MHz）RFID 信道仿真测试平台的开发过程。该试验台包括一个商用 RFID 询问器、一个内置商用无源 RFID 芯片的定制电路板和一个用于无线信道仿真的动态频谱环境仿真器 (DYSE)。在单链路场景中，DYSE 模拟了基于织物 RFID 的呼吸感应引起的天线增益波动。模拟了两种规律呼吸和一种不规律呼吸的情况，并从 RFID 询问器接收到的后处理 RSSI（接收信号强度指示器）数据中检测呼吸频率或异常情况。

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引用次数: 0

AOA-based localization and tracking in multi-element VLC systems 多元素VLC系统中基于aoa的定位与跟踪

The ... IEEE Annual Wireless and Microwave Technology Conference. IEEE Annual Wireless and Microwave Technology Conference

Pub Date : 2015-04-13 DOI: 10.1109/WAMICON.2015.7120424

Yusuf Said Erogluy, Ismail Guvency, Nezih Palay, Murat Yukselz

Visible light communication (VLC) is an emerging technology that is expected to be widely used for indoor wireless communications. Accurate localization of VLC equipment has a wide variety of applications in indoor scenarios, where GPS receivers do not work. This paper proposes a new and effective method for localization of VLC devices based solely on the connectivity information. Due to narrow field of view characteristics of connected LEDs, angle of arrival to an access point can be estimated accurately. Exploiting such features, a least square estimator is developed for location estimation, and a Kalman filter is utilized for improving the tracking performance of a mobile device. Simulation results show that average localization accuracies on the order 0.2 meters can be achieved in various different access point topologies.

可见光通信(VLC)是一项新兴技术，有望在室内无线通信中得到广泛应用。VLC设备的精确定位在GPS接收器无法工作的室内场景中具有广泛的应用。本文提出了一种新的、有效的基于连接信息的VLC器件定位方法。由于连接的led视野狭窄，可以准确地估计到达接入点的角度。利用这些特征，开发了用于位置估计的最小二乘估计器，并利用卡尔曼滤波器来提高移动设备的跟踪性能。仿真结果表明，在不同的接入点拓扑结构下，平均定位精度可达到0.2 m左右。

引用次数: 43

Effect of wind-generated bubbles on the clustered OFDM power loading for time-varying shallow water acoustic channels with limited feedback 风致气泡对有限反馈时变浅水声信道聚类OFDM功率负载的影响

The ... IEEE Annual Wireless and Microwave Technology Conference. IEEE Annual Wireless and Microwave Technology Conference

Pub Date : 2011-04-18 DOI: 10.1109/WAMICON.2011.5872907

Xiaopeng Huang, Victor B. Lawrence

Wind blowing over the sea surface generates many dramatic effects. One of the most important effects is bubbles generated by breaking waves, which can have a major effect on high frequency acoustic propagation, sound speed profile and ambient noise due to the sound scattering and absorption properties of a thin layer of bubbles. In this paper, on one hand, we analyze several important properties of bubbles and their effect on acoustic propagation and sound speed profile, based on the proposed propositions; on the other hand, we propose an optimization model aiming at maximizing the capacity with constraints of the total transmission power in a symbol. It is achieved by adopting the Lloyd algorithm based limited feedback procedure. Simulation results will reveal the underwater acoustic (UWA) channel impulse response with the effect of bubbles, and compare the difference of system capacities in terms of limited feedback procedure, based on with and without the effect of bubbles respectively.

吹过海面的风会产生许多戏剧性的效果。其中最重要的影响之一是破碎波产生的气泡，由于气泡薄层的声音散射和吸收特性，它可以对高频声传播，声速分布和环境噪声产生重大影响。在本文中，一方面，我们分析了气泡的几个重要性质及其对声传播和声速分布的影响;另一方面，我们提出了一种以最大容量为目标的优化模型，并以符号的总传输功率为约束。该算法采用基于有限反馈过程的Lloyd算法实现。仿真结果将揭示在气泡作用下的水声信道脉冲响应，并分别比较在有气泡作用和无气泡作用下，在有限反馈过程下系统容量的差异。

引用次数: 0

Parametric power amplifiers: Old ideas, new technologies 参数化功率放大器:旧思想，新技术

The ... IEEE Annual Wireless and Microwave Technology Conference. IEEE Annual Wireless and Microwave Technology Conference

Pub Date : 2010-04-12 DOI: 10.1109/WAMICON.2010.5461850

J. Kenney

This paper discusses the use of parametric circuits to achieve high power, high efficiency power amplification over wide bandwidths. A new architecture is proposed that uses an upconverting parametric amplifier as a polar modulator. In addition, applications of multiferroic materials to achieve wideband parametric amplification are discussed.

本文讨论了利用参数化电路实现高功率、高效率的宽带宽功率放大。提出了一种采用上变频参数放大器作为极性调制器的新结构。此外，还讨论了多铁性材料在实现宽带参数放大方面的应用。

引用次数: 0

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