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2015 International Conference on Advanced Technologies for Communications (ATC)最新文献

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A Cooperative — Efficient — Reliable MAC protocol for Vehicular Ad hoc Networks 一种协作高效可靠的车载自组织网络MAC协议
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388357
Duc Ngoc Minh Dang, Ha Dang, P. L. Vo, Q. Ngo
Vehicular Ad hoc NETworks (VANETs), an important part of the Intelligent Transportation System (ITS), should provide the reliable safety message broadcasts and efficient non-safety message transmissions to vehicles. The IEEE 1609.4 MAC is designed for VANETs to support multi-channel operations, but it is neither reliable enough for the safety message broadcast nor efficient enough in the service channel (SCH) resources utilization. In this paper, we propose a Cooperative - Efficient - Reliable multi-channel MAC for VANETs, named CER-MAC, which supports both TDMA and CSMA schemes in accessing the control channel (CCH) and provides cooperation in broadcasting the safety messages. The CER-MAC allows vehicle nodes to send safety messages without collision on the CCH within their reserved time slots or the time slots permitted by the neighbors. Moreover, the CER-MAC utilizes the SCH resources during the control channel interval (CCHI) for the non-safety message transmissions. Compared to the current IEEE 1609.4, the proposed CER-MAC protocol outperforms in the reliability for the safety message broadcast and the efficiency for the service channel utilization.
车辆自组织网络(VANETs)是智能交通系统(ITS)的重要组成部分,它需要向车辆提供可靠的安全信息广播和高效的非安全信息传输。IEEE 1609.4 MAC是为vanet支持多通道操作而设计的,但它在安全消息广播方面不够可靠,在服务通道(SCH)资源利用方面不够高效。在本文中,我们提出了一种合作高效可靠的vanet多通道MAC,称为CER-MAC,它支持TDMA和CSMA两种方式访问控制信道(CCH),并提供合作广播安全消息。CER-MAC允许车辆节点在其预留时隙或邻居允许的时隙内在CCH上发送无冲突的安全消息。此外,CER-MAC在控制信道间隔(CCHI)期间利用SCH资源进行非安全消息传输。与现行的IEEE 1609.4协议相比,本文提出的CER-MAC协议在安全消息广播的可靠性和业务信道利用率方面都有明显提高。
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引用次数: 12
An ultra-small capacitor-less LDO with controlled-resistance technique and MOSFET-only bandgap 一种超小型无电容LDO,具有可控电阻技术和仅mosfet带隙
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388354
Long Nguyen, K. Le, Loan Pham-Nguyen Hanoi
In this paper, we propose an ultra-small low dropout regulator (LDO) for NFC tag combining two new techniques. Firstly, a voltage bandgap is designed using only MOSFET instead of BJT in conventional architecture to reduce significantly the chip size. Secondly, to increase the stability of LDO we proposed a controlled circuit to vary output resistance according to output-load current. The latter technique also allows removing the feedback capacitor normally used in a conventional LDO architecture. The proposed LDO has a stable output voltage at 1.8V with input voltage varying from 2.1V to 3.3 V, a maximum current of 10 mA, and only 0.0058 mm2 chip area.
本文结合两种新技术,提出了一种用于NFC标签的超小型低差调节器(LDO)。首先,仅使用MOSFET而不是传统结构中的BJT来设计电压带隙,以显着减小芯片尺寸。其次,为了提高LDO的稳定性,我们提出了一种根据输出负载电流变化输出电阻的控制电路。后一种技术还允许移除通常在传统LDO架构中使用的反馈电容器。该LDO输出电压稳定在1.8V,输入电压在2.1V ~ 3.3 V之间变化,最大电流为10 mA,芯片面积仅为0.0058 mm2。
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引用次数: 3
A 180-nm CMOS RF transmitter for UHF RFID reader 一个180纳米的CMOS射频发射机,用于UHF RFID阅读器
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388329
K. Tuan, P. M. Cuong Huynh
This paper presents the design of the RF transmitter of RFID reader using 180-nm CMOS technology at 868 MHz. The design of RF transmitter of RFID reader in this paper includes up-conversion mixer, balun and class E of power amplifier. These results are maximum output power of 20.34 dBm, OP1dB of 19.3 dBm, PAE of 38.35% and power consumption of 168.57 mW.
本文采用180nm CMOS技术设计了RFID读写器的射频发射器,工作频率为868 MHz。本文设计的RFID读写器射频发射器包括上变频混频器、平衡器和E类功率放大器。结果表明,最大输出功率为20.34 dBm, OP1dB为19.3 dBm, PAE为38.35%,功耗为168.57 mW。
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引用次数: 0
Ad-Hoc routing and data transmission protocol with Byzantine failure detection and isolation 具有拜占庭式故障检测和隔离的Ad-Hoc路由和数据传输协议
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388322
Norihiro Sota, H. Higaki
Wireless multihop networks consist of numbers of wireless nodes. Hence, introduction of failure detection and recovery is mandatory. Until now, various failure detection and recovery methods such as route switch and multiple routes detection have been proposed based on an assumption with stop failure model. However, the assumption that failed wireless nodes never transmit any messages too restricts the area where the proposed methods can be applied. In order to solve this problem, we propose a novel failure detection and notification method that supports not only stop failure but also Byzantine failure. That is, it is possible for failed wireless nodes to transmit malicious messages not according to the data message transmission and the failure detection and notification protocols unconsciously due to failure or even intentionally. Here, the design of failure detection and notification protocols is critical. In this paper, Byzantine failures in an intermediate node are detected by its multiple neighbor wireless nodes cooperatively since the neighbor wireless nodes are also vulnerable and might transmit erroneous failure notifications. From the performance viewpoint, no additional control messages are required to be transmitted while no failure wireless node is detected, i.e., in usual data message transmissions.
无线多跳网络由许多无线节点组成。因此,引入故障检测和恢复是必须的。到目前为止,各种故障检测和恢复方法,如路由切换和多路由检测,都是基于停止故障模型的假设提出的。然而,故障无线节点从不传输任何消息的假设也限制了所提出方法的应用范围。为了解决这一问题,我们提出了一种新的故障检测和通知方法,该方法不仅支持停止故障,而且支持拜占庭故障。即故障的无线节点有可能由于故障而不自觉地甚至故意地不按照数据报文传输和故障检测通知协议发送恶意报文。在这里,故障检测和通知协议的设计至关重要。在本文中,由于相邻无线节点也是脆弱的,可能会发送错误的故障通知,因此中间节点的拜占庭故障由其多个相邻无线节点协同检测。从性能的角度来看,在没有检测到故障无线节点的情况下,不需要传输额外的控制消息,即在通常的数据消息传输中。
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引用次数: 0
A combination model based on a neural network autoregression and Bayesian network to forecast for avoiding brown plant hopper
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388323
Duy Vu
In this paper, we propose a new approach that is to combine a model of time series with Bayesian networks to create a new forecasting model to predict the occurrence of harmful pests of rice. Ability of forecast system knows when immigrant brown plant hopper (BPH) peaks to make a calendar of sowing rice to avoid them. This is indeed helpful for experts as well as farmers to sow rice of seeds actively and simultaneously on a large scale for each new rice crop. Using knowledge of experts and processing historical data combined with data at present time are able to create more highly accurate forecasts than just relying on historical data. This model is a decision support system for experts in the Plant protection centre of the South of Vietnam to guide farmers to sow cultivation in a specific area, pilot for 22 Southern provinces.
本文提出了一种新的方法,即将时间序列模型与贝叶斯网络相结合,建立一个新的预测模型来预测水稻有害害虫的发生。预报系统能够准确预测褐飞虱的发生高峰,并制定播稻日历以避免褐飞虱的发生。这确实有助于专家和农民积极地同时大规模地为每一种新的水稻作物播种水稻种子。利用专家的知识和处理历史数据与当前数据相结合,能够比仅仅依靠历史数据做出更准确的预测。该模型是越南南部植物保护中心专家的决策支持系统,用于指导农民在特定地区播种种植,在南部22个省份进行试点。
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引用次数: 2
New upper bound for high-rate spatial modulation systems using QAM modulation 采用QAM调制的高速率空间调制系统的新上界
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388413
Van-Thien Luong, Minh-Tuan Le, D. Nguyen, X. Tran, Vu-Duc Ngo
In this paper, we present a new upper bound for the bit error probability (BEP) of the so-called High-Rate Spatial Modulation (HR-SM) system using QAM modulation introduced by Thu Phuong Nguyen et al. in [1], over a quasi-static Rayleigh fading channel. Our approach based on the Verdu's theorem [2], the concept of the spatial constellation (SC) codewords and maximum likelihood (ML) decoder in [1] results in the new upper bound which is tighter than the union bound due to eliminating a number of redundant pairwise error probabilities (PEPs). Therefore, by using the new upper bound rather than the union bound, we can evaluate the bit-error performance of HR-SM systems more exactly, especially when the signal-to-noise power ratio (SNR) is sufficiently high.
在本文中,我们提出了所谓的高速率空间调制(HR-SM)系统的误码率(BEP)的新上界,该系统使用Thu Phuong Nguyen等人在[1]中引入的QAM调制,在准静态瑞利衰落信道上。我们的方法基于Verdu定理[2],[1]中的空间星座(SC)码字和最大似然(ML)解码器的概念,由于消除了许多冗余的对错误概率(pep),从而得到比联合界更紧的新上界。因此,使用新的上界而不是联合界可以更准确地评价HR-SM系统的误码性能,特别是在信噪比足够高的情况下。
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引用次数: 1
Applying queuing theory to evaluate performance of cluster wireless sensor networks 应用排队论评价集群无线传感器网络的性能
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388380
Ngo Van Mao, V. Son
Enhancement of Wireless Sensor Networks (WSNs) by improving the network performance has been researched in recent years. This paper presents the application of queuing theory to evaluate performance of WSNs using queuing network models. The analysis of performance parameters consider both kinds of data and routing packets. Moreover, the optimal values of parameters such as service rate and queue length of each sensor node are also investigated under the consideration of lossy WSNs with the coverage of signal transmission and packet loss ratio. The results of the proposed analytical model is compared with the simulation results in various scenarios for validation.
通过提高网络性能来增强无线传感器网络(WSNs)是近年来研究的热点。本文利用排队网络模型,将排队理论应用于无线传感器网络的性能评估。性能参数的分析考虑了两种类型的数据和路由数据包。此外,在考虑信号传输覆盖率和丢包率的有耗wsn情况下,研究了各传感器节点的服务率和队列长度等参数的最优值。将所提出的分析模型的结果与不同场景下的仿真结果进行了比较,以验证其有效性。
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引用次数: 3
Investigation on visible light communication system using OLED with dimming support 具有调光支持的OLED可见光通信系统研究
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388366
P. Q. Thai, Nguyen Xu Lin, S. Shigeru, Jiang Liu, Zhong Wende
In this paper, a visible light communications (VLC) system prototype using organic light emitting diode (OLED) with dimming support was realized and tested. Frequency response and driving range of OLED were measured and discussed. Considering practical applications of OLED, variable pulse position modulation (VPPM) signal was used to support data transmission under dimming condition. Our prototype was able to transmit up to 85 kbps data rate using an OLED with only 7 kHz 3 dB modulation bandwidth. For the target BER=10-3 with FEC, the luminous flux could be varied within 5-8 lm.
本文利用有机发光二极管(OLED)实现了一个具有调光支持的可见光通信(VLC)系统原型,并进行了测试。对OLED的频率响应和驱动范围进行了测量和讨论。考虑到OLED的实际应用,采用可变脉冲位置调制(VPPM)信号支持调光条件下的数据传输。我们的原型能够使用仅7 kHz 3 dB调制带宽的OLED传输高达85 kbps的数据速率。对于BER=10-3且FEC的目标,光通量可在5-8 lm范围内变化。
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引用次数: 0
Doubly selective channel estimation in full-duplex MIMO-OFDM systems 全双工MIMO-OFDM系统中的双选择信道估计
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388395
V. Nguyen-Duy-Nhat, H. Nguyen-Le, Chien Tang-Tan, T. Bui-Thi-Minh
This paper studies the problem of frequency-and time-selective (doubly selective) channel estimation in full-duplex multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In particular, the maximum-likelihood (ML) principle is employed to formulate a pilot-aided channel estimation algorithm. To reduce the number of doubly selective channel parameters to be estimated, various basis expansion models (BEMs) are used as fitting parametric models. The use of BEMs enables an increase in the system spectral efficiency since estimating a reduced number of channel parameters entails a reduction in used pilot overhead. This paper provides analytical and empirical results of the BEM-based channel estimation accuracy. Several mean square error (MSE) results show that the discrete prolate spheroidal (DPS) or Karhuen Loeve (KL) basis functions would be a suitable choice for BEM-based full-duplex doubly selective channel estimation.
研究了全双工多输入多输出(MIMO)正交频分复用(OFDM)系统中频率和时间选择性(双选择性)信道估计问题。特别地,采用最大似然(ML)原理来制定导频辅助信道估计算法。为了减少需要估计的双选择性信道参数的数量,采用各种基展开模型作为拟合参数模型。bem的使用可以提高系统的频谱效率,因为估计减少的信道参数数量需要减少使用的导频开销。本文给出了基于边界元法的信道估计精度的分析和实证结果。均方误差(MSE)结果表明,离散长球面基函数(DPS)或Karhuen Loeve基函数(KL)是基于bem的全双工双选择性信道估计的合适选择。
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引用次数: 2
Background subtraction with neighbor-based intensity correction algorithm 基于邻域强度校正算法的背景减法
Pub Date : 2015-10-01 DOI: 10.1109/ATC.2015.7388331
Thien Huynh-The, O. Baños, Ba-Vui Le, Dinh-Mao Bui, Sungyoung Lee, Yongik Yoon, T. Le-Tien
An efficient foreground detection algorithm is presented in this work to be robust against consecutively illuminance changes and noise, and adaptive with dynamic speeds of motion in the background. The scene background is firstly modeled by a novel algorithm, namely Neighbor-based Intensity Correction, which identifies and modifies motion pixels extracted from the difference of the background and the current frame. Concretely the first frame is assumed as an initial background to be updated at each new coming frame based on the mechanism of the standard deviation value comparison. Two pixel windows used for standard deviation calculation are generated surrounding a corresponding motion pixel from the background and the current frame. The steadiness of the current background at the pixel-level is measured by a constantly updating factor to decide the usage of the algorithm or not. In the next stage, the foreground of the current frame are detected by the background subtraction scheme with an optimal Otsu threshold. This method is evaluated on various well-known datasets in the object detection and tracking area and then compared with recent approaches via some common quantitative measurements. From experimental results, the proposed method achieves the better results (approximately 5-20%) in term of the foreground detection accuracy.
本文提出了一种有效的前景检测算法,该算法对连续的照度变化和噪声具有鲁棒性,并能自适应背景中的动态运动速度。首先采用基于邻域的强度校正算法对场景背景进行建模,该算法对从背景和当前帧的差中提取的运动像素进行识别和修正。具体地说,假设第一帧作为初始背景,在每一帧到来时,基于标准差值比较的机制进行更新。围绕来自背景和当前帧的相应运动像素生成两个用于标准差计算的像素窗口。当前背景在像素级的稳定性通过一个不断更新的因子来衡量,以决定是否使用该算法。下一阶段,采用最优Otsu阈值的背景相减方案检测当前帧的前景。该方法在目标检测和跟踪领域的各种已知数据集上进行了评估,然后通过一些常见的定量测量与最近的方法进行了比较。实验结果表明,该方法在前景检测精度方面达到了较好的效果(约为5-20%)。
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引用次数: 1
期刊
2015 International Conference on Advanced Technologies for Communications (ATC)
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