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2018 Twenty Fourth National Conference on Communications (NCC)最新文献

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Hybrid Satellite-Terrestrial Cooperative Communication with Mobile Terrestrial Nodes 基于移动地面节点的星地混合协同通信
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8599994
Neeraj Varshney, A. Jagannatham
This work investigates the performance of hybrid satellite-terrestrial systems over time-selective fading links arising due to the node mobility with multiple relay based selective decode-and-forward cooperation. The aerial satellite-to-relay and satellite-to-destination links are non-identical time-selective shadowed Rician fading in nature, whose parameters depend on the elevation angle of the satellite, whereas the terrestrial relay-destination links are assumed to be non-identical time-selective generalized Nakagami faded. Closed form expressions are derived for the per-frame average symbol error rate (SER) and asymptotic SER floor considering the transmission of Mary PSK modulated symbols. It is observed that the time-varying nature of the links significantly degrades the system performance. Further, the impact of the satellite elevation angles at the terrestrial nodes is explicitly demonstrated through simulations, along with the effect of preamble versus midamble for channel estimation. The error rate of the system is seen to reduce significantly with increasing satellite elevation angle at the relay when the satellite-destination link experiences frequent heavy shadowing (FHS) and the relay-destination links are relatively strong. However, for other scenarios when the relay-destination links are relatively weak and satellite-relay links experience FHS, significant performance improvement can be seen by increasing the satellite elevation angle at the destination UE.
本文研究了卫星-地面混合系统在时间选择性衰落链路上的性能,这种衰落链路是由基于多中继的选择性译码转发合作的节点移动性引起的。航空星中继链路和卫星目标链路本质上是非同时选择性的阴影时延衰落,其参数取决于卫星的仰角,而地面中继链路本质上是非同时选择性的广义Nakagami衰落。考虑多个PSK调制符号的传输,导出了每帧平均误码率(SER)和渐近误码率层的封闭表达式。可以观察到,链路的时变特性显著降低了系统的性能。此外,卫星仰角在地面节点上的影响通过模拟得到了明确的证明,以及前置和中前置对信道估计的影响。当卫星-目的链路频繁发生重阴影(FHS)且中继-目的链路相对较强时,随着中继处卫星仰角的增大,系统的误差率显著降低。然而,对于中继-目的链路相对较弱且卫星-中继链路经历FHS的其他场景,通过增加目标终端的卫星仰角可以看到显著的性能改善。
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引用次数: 4
A Polarization-Independent Tunable Microwave Absorber with Wide Tuning Range 具有宽调谐范围的偏振无关可调谐微波吸收器
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8600063
Saptarshi Ghosh, Harsh Sheokand, K. V. Srivastava
In this paper, a tunable microwave absorber has been presented for L-band applications. The proposed design consists of square loops which are connected through varactor diodes across the diagonals. By controlling the reverse voltage of the varactors, the absorption frequency can be tuned for a wide frequency range. The novelty of the proposed design lies in its four-fold symmetry, which makes the structure polarization-insensitive unlike the earlier reported tunable absorbers. Furthermore, a prototype of the proposed structure has been fabricated where the active components are regulated using a novel biasing technique. The measured results also show good agreement with the simulated responses under normal incidence as well as for different polarization angles.
本文提出了一种用于l波段的可调谐微波吸收器。所提出的设计包括通过跨对角线的变容二极管连接的方形环路。通过控制变容管的反向电压,可以在很宽的频率范围内调节吸收频率。所提出的设计的新颖之处在于它的四重对称,这使得结构对极化不敏感,不像以前报道的可调谐吸收器。此外,所提出的结构的原型已经制造,其中的有效成分是使用一种新的偏置技术进行调节。测量结果与正入射和不同偏振角下的模拟结果吻合较好。
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引用次数: 0
Channel Allocation for Multiple D2D-Multicasts in Underlay Cellular Networks using Outage Probability Minimization 基于中断概率最小化的底层蜂窝网络中多个d2d组播信道分配
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8599925
Ajay Bhardwaj, S. Agnihotri
Underlay in-band device-to-device (D2D) multicast communication, where same content is disseminated via direct links in a group, has potential to improve the spectral and energy efficiencies of cellular networks. However, existing resource allocation techniques may not work well for multicast in next generation wireless networks with many simultaneously connected devices. To address this problem, we focus on channel allocation algorithms where multiple D2D multicast groups (MGs) share the channel with a cellular user (CU). The objective is to maximize the sum throughput of CUs and D2D multicast groups, while ensuring a certain level of quality of service (QoS) to CUs and D2D MGs. Our main contributions are the exact calculation of outage probability experienced by a D2D receiver in the multicast group and a scheme to share channels among D2D MGs and CUs by minimizing these probabilities. Numerical results demonstrate the impact on the sum throughput of the number of MGs sharing the channel with a CU, geographical spread of MGs, and the maximum transmit power of cellular users.
底层带内设备对设备(D2D)多播通信,其中相同的内容通过一组中的直接链接传播,具有提高蜂窝网络频谱和能量效率的潜力。然而,现有的资源分配技术可能不能很好地解决具有多个设备同时连接的下一代无线网络中的组播问题。为了解决这个问题,我们将重点放在信道分配算法上,其中多个D2D多播组(mg)与蜂窝用户(CU)共享信道。目标是最大化cu和D2D组播组的总吞吐量,同时保证对cu和D2D组播组的服务质量(QoS)。我们的主要贡献是精确计算多播组中D2D接收器经历的中断概率,以及通过最小化这些概率在D2D mg和cu之间共享信道的方案。数值结果显示了与一个CU共享信道的mg数量的总吞吐量、mg的地理分布以及蜂窝用户的最大发射功率的影响。
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引用次数: 3
Performance Evaluation and Optimization of Multiantenna Two-Way Relaying System with CCI 带CCI的多天线双向中继系统性能评估与优化
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8599943
Imtiyaz Khan, Krishna Kanth Dhulipudi, Poonam Singh
In this paper, we investigate the performance of multiple antenna two-way relay network with transmit beamforming and maximum ratio combining, in the presence of multiple interferers and noise over Nakagami-m fading channels. We have evaluated the signal-to-interference-plus-noise ratio (SINR) in closed-form, along with the tight lower bound on the outage probability (OP). The average symbol error probability (SEP) for binary phase shift keying is evaluated by using cumulative distribution function of the SINR. Furthermore, to render insights into the performance degradation due to the effect of interference, asymptotic expression of OP and SEP are obtained, which easily enables us to evaluate diversity order and coding gain. We further investigate the joint optimization problem of relay location and power allocation to minimize the OP. Finally, the tightness of our analysis is attested through Monte Carlo simulation.
本文研究了具有发射波束形成和最大比合并的多天线双向中继网络在Nakagami-m衰落信道中存在多重干扰和噪声时的性能。我们以封闭形式评估了信噪比(SINR),以及中断概率(OP)的紧密下界。利用信噪比的累积分布函数计算二相移键控的平均符号误差概率(SEP)。此外,为了深入了解由于干扰的影响而导致的性能下降,我们得到了OP和SEP的渐近表达式,使我们能够轻松地评估分集顺序和编码增益。进一步研究了继电器定位和功率分配的联合优化问题,以使op最小化。最后,通过蒙特卡罗仿真证明了分析的严密性。
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引用次数: 0
A Study on Pathloss Model for UAV Based Urban Disaster and Emergency Communication Systems 基于无人机的城市灾害应急通信系统路径损失模型研究
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8600260
A. Ranjan, B. Panigrahi, H. Rath, P. Misra, Anantha Simha, H. B. Sahu
In recent times, airborne Base Station (BS) or Unmanned Aerial Vehicle (UAV) mounted Evolved Node B (UeNBs) are used to provide broadband services, and rescue responses in emergency and natural disaster scenarios. Most of the prior studies on airborne BS assume outdoor users only and consider their position coordinates in a two-dimensional (2-D) plane considering only Euclidean distance based pathloss. However in urban natural disaster scenarios such as flooding or cyclone, users are trapped inside single or multi-storey buildings; user positions are in three-dimensional (3-D) plane. Reliable communication and rescue operations in such situation is possible if pathloss characteristics for both, user to UeNB (uplink) and vice versa (downlink), are known a-priori. Since pathloss in above scenarios is a combination of indoor and outdoor component, it becomes a challenge to adopt appropriate model which can be used during communications. In this paper, we have studied several state-of-the-art pathloss models applicable in the above scenarios and compared their performances. We have also studied the impact of indoor and outdoor environments on the uplink and downlink pathloss models. Our extensive simulation results give a full fledged insight to uplink and downlink channel characteristics of UAV based wireless emergency communication system. From our extensive studies and simulations, we have learnt that Winner II model [1] with additional indoor blockage component provides the best pathloss model for an urban emergency scenario. Furthermore, we have also analyzed the impact of different topological parameters such as UeNB hovering altitude, building heights, indoor and outdoor distance of users, etc., on the pathloss characteristics.
近年来,机载基站(BS)或搭载进化节点B (uenb)的无人机(UAV)被用于提供宽带服务,以及在紧急情况和自然灾害场景下的救援响应。以往的机载BS研究大多只假设室外用户,并且只考虑基于欧氏距离的路径损失,在二维平面上考虑其位置坐标。然而,在城市自然灾害情况下,如洪水或气旋,用户被困在单层或多层建筑物内;用户位置在三维平面上。如果先验地知道用户到UeNB(上行链路)和用户到UeNB(下行链路)的路径丢失特性,就有可能在这种情况下进行可靠的通信和救援行动。由于上述场景的路径损耗是室内和室外组件的结合,因此采用合适的模型在通信过程中使用成为一个挑战。在本文中,我们研究了几种适用于上述场景的最先进的路径损失模型,并比较了它们的性能。我们还研究了室内和室外环境对上行和下行路径损耗模型的影响。广泛的仿真结果使我们对基于无人机的无线应急通信系统的上行和下行信道特性有了全面的了解。从我们广泛的研究和模拟中,我们了解到含有额外室内阻塞成分的Winner II模型[1]为城市应急场景提供了最佳的路径损失模型。此外,我们还分析了不同拓扑参数如UeNB悬停高度、建筑高度、用户室内外距离等对路径损失特性的影响。
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引用次数: 15
A Simple Robust Equal-Split T-Junction Power Divider at Three Frequencies 一个简单的鲁棒等分裂t结功率分压器在三个频率
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8600226
D. Banerjee, A. Saxena, M. Hashmi
This paper presents a novel design of a tri-band equal-split T-junction power divider incorporating a new concept of impedance matching using a common frequency. The power divider hence designed is able to divide power equally between the two output ports at three desired frequencies of interest- 900MHz (GSM downlink), 1.8GHz (GSM uplink) and 3.5GHz (WiMAX and 5G communication under testing). An FR4 prototype, fabricated based on the theoretical formulations, shows a good agreement between the simulated and measured results.
本文提出了一种新颖的三频带等分路t结功率分配器的设计,该分配器采用了使用公共频率进行阻抗匹配的新概念。因此设计的功率分配器能够在三个感兴趣的期望频率下在两个输出端口之间平均分配功率- 900MHz (GSM下行链路),1.8GHz (GSM上行链路)和3.5GHz(测试中的WiMAX和5G通信)。基于理论公式制作的FR4样机,仿真结果与实测结果吻合较好。
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引用次数: 1
Balanced Use of Battery Power in Ad-hoc Wireless Sensor Networks 自组织无线传感器网络中电池电量的均衡使用
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8600143
Hemant Aggarwal, Santosh Shah
We focused on a problem where balanced use of sensor nodes' battery power is considered to maximize the overall lifetime of ad-hoc Wireless Sensor Networks. A process in which utilizing less attended sensor nodes compare to sensor nodes which are used more frequently enhances the overall network lifetime. To perform this process, we propose a joint optimization problem to select a subset of active sensor nodes and a multi-hop routing structure interconnecting all selected sensor nodes, which helps to route the aggregated information to a querying node. Our optimization problem becomes non-convex over the subset selection and the multi-hop routing paths selection, thus belonging to the class of NP-hard problems. We solve our problem by relaxing one of the variable so that optimization problem becomes convex over this variable, which can be solved efficiently. We also propose an iterative algorithm to solve this problem distributively. We demonstrate by extensive simulation that the above mentioned both the approaches increase the overall network lifetime for a given power budget. One another important result is that the distributed approach provides an optimal routing structure considering over the well known shortest path tree based routing structure.
我们关注的问题是平衡使用传感器节点的电池功率,以最大限度地提高自组织无线传感器网络的整体寿命。与使用更频繁的传感器节点相比,利用较少参与的传感器节点的过程可以提高整个网络的生存期。为了实现这一过程,我们提出了一个联合优化问题,以选择主动传感器节点的子集和连接所有选定传感器节点的多跳路由结构,这有助于将聚合信息路由到查询节点。我们的优化问题在子集选择和多跳路由路径选择上变得非凸,因此属于np困难问题。我们通过松弛其中一个变量来解决问题,使优化问题对这个变量变得凸,这样可以有效地解决问题。我们还提出了一种分布式迭代算法来解决这一问题。我们通过广泛的仿真证明,上述两种方法都可以在给定的功率预算下增加总体网络生命周期。另一个重要的结果是,考虑到众所周知的基于最短路径树的路由结构,分布式方法提供了最优的路由结构。
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引用次数: 0
Training-Based Joint Antenna and Relay Selection in Multiuser Downlink Cellular Network with RF Impairments 射频损伤下多用户蜂窝网络中基于训练的联合天线和中继选择
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8600092
A. Mishra, Poonam Singh
We analyze the performance of a dual-hop downlink cellular amplify-and-forward cooperative system in the presence of both channel estimation errors and radio frequency (RF) impairments, where multiple antennas are deployed only at the base station (BS) and single-antenna at relays and mobile stations (MS). Specifically, we derive approximate as well as exact closed-form expressions for the outage probability and expected spectral efficiency. In addition, simple asymptotic expressions at the high signal-to-noise ratio (SNR) regime are obtained, which facilitate the characterization of the achievable diversity order of the system. To validate the derived analytical expressions, we presented simulation results which are sufficiently tight across the entire range of SNRs. Findings of the paper suggest that full diversity order can be achieved only when the RF front-end hardware is assumed to be perfect, while in practice the imperfections in hardware are inevitable and reduce diversity order of the system. Moreover, the influence of key parameters such as the number of antennas, users, and relays on the system performance has been presented with the influence of the level of RF impairments.
我们分析了双跳下行蜂窝放大转发合作系统在信道估计误差和射频(RF)损伤存在下的性能,其中多个天线仅在基站(BS)部署,而在中继和移动站(MS)部署单天线。具体地说,我们导出了停电概率和期望频谱效率的近似和精确的封闭表达式。此外,得到了高信噪比下的简单渐近表达式,便于表征系统可实现的分集阶数。为了验证导出的解析表达式,我们给出了在整个信噪比范围内足够紧密的仿真结果。本文的研究结果表明,只有在假设射频前端硬件完善的情况下才能实现全分集顺序,而在实际应用中,硬件的不完善是不可避免的,会降低系统的分集顺序。此外,还讨论了天线数量、用户数量和中继数量等关键参数对系统性能的影响,以及射频损伤水平的影响。
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引用次数: 0
A Deep Learning Based Technique for Anomaly Detection in Surveillance Videos 基于深度学习的监控视频异常检测技术
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8599969
Prakhar Singh, Vinod Pankajakshan
In this paper the problem of anomaly detection in surveillance videos is addressed, which refers to the detection of events that do not conform to normal behaviour. To solve this problem, this paper proposes an approach that utilizes a Deep Neural Network (DNN) to model normal behaviour. Specifically, a DNN is built that learns to predict future frames from past frames using a normal (anomaly free) dataset. The predictions from the model are then compared with testing video for similarity, and the resulting error is used to detect anomalies. Benchmarks of the proposed approach on two datasets common in the anomaly detection literature show that it performs comparably to other methods in the literature, even though it does not rely on any hand-crafted features. Moreover, comparison to other deep learning techniques in the literature shows that the proposed approach is significantly less complex.
本文研究了监控视频中的异常检测问题,即对不符合正常行为的事件进行检测。为了解决这个问题,本文提出了一种利用深度神经网络(DNN)来模拟正常行为的方法。具体来说,我们构建了一个深度神经网络,它可以使用正常(无异常)数据集从过去的帧中学习预测未来的帧。然后将模型的预测结果与测试视频的相似性进行比较,并使用产生的误差来检测异常。在异常检测文献中常见的两个数据集上对所提出的方法进行的基准测试表明,尽管它不依赖于任何手工制作的特征,但它的性能与文献中的其他方法相当。此外,与文献中其他深度学习技术的比较表明,所提出的方法明显不那么复杂。
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引用次数: 22
Deterministic Evolution Through Indexed Leaf Node Based Attachment in Complex Networks 复杂网络中基于索引叶节点连接的确定性进化
Pub Date : 2018-02-01 DOI: 10.1109/NCC.2018.8599918
G. Suresh, Abhishek Chakraborty, B. S. Manoj
Complex networks are abstract graphs where the nodes are real-world entities and their relationships can be imitated as links. The relationships among various real-world entities are neither entirely random nor fully regular, thus, the structures of evolving complex networks are non-trivial in nature. To study the characteristics of such evolving complex networks, efficient network models, that can emulate the realworld networks, are needed. In this paper, a novel network model, deterministic evolution through leaf node attachment (DELNA), that can efficiently emulate many real-world networks, such as technological networks, social networks, and other manmade networks, is proposed. We also compare our DELNA-based network model with a few existing network evolution models, namely Barabási-Ravasz-Vicsck deterministic network model and Barabási-Albert network evolution model. DELNA can find applications in the Internet of things and the satellite communications, where the network resilience is a very crucial parameter.
复杂网络是抽象的图,其中的节点是真实世界的实体,它们之间的关系可以被模仿成链接。各种现实世界实体之间的关系既不是完全随机的,也不是完全规则的,因此,进化的复杂网络结构在本质上是非平凡的。为了研究这种不断演变的复杂网络的特性,需要能够模拟现实世界网络的高效网络模型。本文提出了一种新的网络模型,即通过叶节点连接的确定性进化(DELNA),该模型可以有效地模拟许多现实世界的网络,如技术网络、社会网络和其他人工网络。我们还将基于delna的网络模型与现有的几种网络演化模型,即Barabási-Ravasz-Vicsck确定性网络模型和Barabási-Albert网络演化模型进行了比较。DELNA可以在物联网和卫星通信中找到应用,在这些领域,网络弹性是一个非常关键的参数。
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引用次数: 0
期刊
2018 Twenty Fourth National Conference on Communications (NCC)
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