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arXiv 2017年

作者： Yu, Liang Di Xie Jiang, Tao Zou, Yulong Wang, Kun Key Laboratory of Broadband Wireless Communication Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing210003 China Wuhan National Laboratory for Optoelectronics School of Electronics Information and Communications Huazhong University of Science and Technology Wuhan430074 China

In this paper, we investigate the problem of minimizing the long-term total cost (i.e., the sum of energy cost and thermal discomfort cost) associated with a Heating, Ventilation, and Air Conditioning (HVAC) system of a multizone commercial building under smart grid environment. To be specific, we first formulate a stochastic program to minimize the time average expected total cost with the consideration of uncertainties in electricity price, outdoor temperature, the most comfortable temperature level, and external thermal disturbance. Due to the existence of temporally and spatially coupled constraints as well as unknown information about the future system parameters, it is very challenging to solve the formulated problem. To this end, we propose a realtime HVAC control algorithm based on the framework of Lyapunov optimization techniques without the need to predict any system parameters and know their stochastic information. The key idea of the proposed algorithm is to construct and stabilize virtual queues associated with indoor temperatures of all zones. Moreover, we provide a distributed implementation of the proposed realtime algorithm with the aim of protecting user privacy and enhancing algorithmic scalability. Extensive simulation results based on real-world traces show that the proposed algorithm could reduce energy cost effectively with small sacrifice in thermal comfort. Copyright © 2017, The Authors. All rights reserved.

关键词： Smart power grids

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Vision-Assisted Cross-Modal Haptic Data Compression for Immersive communication

Vision-Assisted Cross-Modal Haptic Data Compression for Imme...

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IEEE Conference on wireless communications and networking

作者： Hang Lu Kaixiang Yang Wenqin Zhuang Mingkai Chen Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China Digital Channel Department Limited JiangSu Branch China Life Property & Casualty Insurance Company Nanjing China

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

Haptic data compression has gradually become a key issue for emerging immersive communications. However, it is challenging to achieve a trade-off between high perceptual quality and compression ratio in haptic data compression scheme. Inspired by the perspective of biological cognitive mechanism, we propose a cross-modal haptic compression scheme to improve the perception quality on VR devices in this paper. Since multimodal fusion is routinely employed to improve the ability of system in cognition, we assume that haptic codec is guided by visual semantics to strengthen data relevance in the coding process. We first design a multi-dimensional tactile feature fusion network (MTFFN), which extracts the multi-dimensional features in the material surface and maps them to infer a range of haptic coding parameters. Secondly, we provide second-order difference and linear interpolation to obtain an optimal criterion for the determination of codec parameters, which are inferred by the material surface characteristics. Finally, the simulation results reveal that our compression scheme can efficiently make a customized codec procedure for different materials, obtaining more than 17% improvement in terms of compression ratio with high immersive perceptual quality at the same time.

关键词： Visualization Codecs Sensitivity Simulation Semantics Data compression Feature extraction

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Outage Performance of the Integrated Satellite-Terrestrial network Based on the SNR Threshold

Outage Performance of the Integrated Satellite-Terrestrial N...

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International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Xiaoyu Liu Huaicong Kong Min Lin Wei-Ping Zhu College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China The Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China Concordia University Montreal Canada

In this paper, we investigate and propose a new transmission scheme for integrated satellite-terrestrial relay network, where a terrestrial relay equipped with multiple antennas either keeps silent or forwards message to the terrestrial user according to amplify-and-forward (AF) protocol based on the quality of the channel between the satellite and the user. By utilizing the maximal ratio combining (MRC) and maximal ratio transmission (MRT), we derive a closed-form expression for the exact outage probability (OP) of the system. Finally, numerical simulation results are provided to validate the theoretical performance analysis and reveal the impacts of the channel parameters and SNR threshold on the considered system performance.

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On Cooperative Double-IRS Aided Downlink NOMA System with Multiple Channels

On Cooperative Double-IRS Aided Downlink NOMA System with Mu...

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IEEE Conference on wireless communications and networking

作者： Zaichen Zhu Hong Wang Peiyu Wang Zheng Shi Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China School of Intelligent Systems Science and Engineering Jinan University Zhuhai China

ISBN: (数字)9798350303582

ISBN: (纸本)9798350303599

Both intelligent reflecting surface (IRS) and non-orthogonal multiple access (NOMA) are advocated as the promising technologies to support high spectrum/energy efficiency for future wireless communications. In this paper, we investigate the effect of cooperative-IRS on transmission power consumption for downlink NOMA communication system with multiple channels. To this end, we formulate a power minimization problem for double-IRS aided downlink NOMA system with multiple channels, taking into account the constraint of each user's minimum signal-to-interference-plus-noise-ratio (SINR). In order to solve the non-convex optimization problem brought by double-IRS, we first establish the relation between the transmit power and the phase shifts, and then develop an alternative optimization algorithm to determine the optimal phase shift. Simulation results show that the performance of deploying double-IRS is significantly better than that of deploying a centralized-IRS when there are sufficient number of reflecting elements. Besides, compared with various benchmarking schemes, the proposed joint optimization algorithm can significantly reduce the transmit power consumption.

关键词： wireless communication NOMA Power demand Simulation Quality of service Interference Downlink

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Adaptive spatial modulation for visible light communications with an arbitrary number of transmitters

arXiv

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arXiv 2018年

作者： Wang, Jin-Yuan Ge, Hong Zhu, Jian-Xia Wang, Jun-Bo Dai, Jianxin Lin, Min Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210003 China National Mobile Communications Research Laboratory Southeast University Nanjing210096 China School of Science Nanjing University of Posts and Telecommunications Nanjing210003 China

As a power and bandwidth efficient modulation scheme, the optical spatial modulation (SM) technique has recently drawn increased attention in the field of visible light communications (VLC). To guarantee the number of bits mapped by the transmitter's index at each timeslot is an integer, the number of transmitters (i.e., light-emitting diodes) in the SM based VLC system is often set be a power of two. To break the limitation on the required number of transmitters and provide more design flexibility, this paper investigates the SM based VLC with an arbitrary number of transmitters. Initially, a channel adaptive bit mapping (CABM) scheme is proposed, which includes three steps: Bit mapping in space domain, bit mapping in signal domain, and the channel adaptive mapping. The proposed CABM scheme allows operation with an arbitrary number of transmitters, and is verified to be an efficient scheme through numerical results. Based on the CABM scheme, the information-theoretical aspects of the SM based VLC are analyzed. The theoretical expression of the mutual information is first analyzed. However, it is very hard to evaluate system performance. To obtain more insights, a lower bound of the mutual information is derived, which is in closedform. Both theoretical analysis and numerical results show that the gap between the mutual information and its lower bound is small. Finally, to further improve the system performance, the precoding scheme is proposed for the SM based VLC. Numerical results show that the system performance improves dramatically when using the proposed precoding scheme. Copyright © 2018, The Authors. All rights reserved.

关键词： Visible light communication

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The Proof is in the Pudding: Decision-Oriented Machine-Type wireless Video Transmission

The Proof is in the Pudding: Decision-Oriented Machine-Type ...

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IEEE Conference on Global communications (GLOBECOM)

作者： Jie Song Yun Gao Dan Wu Liang Zhou Yi Qian Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing China Institute of Communications Engineering Army Engineering University of PLA Nanjing China Department of Electrical and Computer Engineering University of Nebraska-Lincoln Lincoln USA

ISBN: (数字)9798350351255

ISBN: (纸本)9798350351262

With the rise of the Internet of Everything, machine-type wireless video applications like intelligent surveillance are increasingly becoming mainstream network services. However, the massive transmission of video streams heavily burdens wireless networks. Existing methods typically establish a correlation between the transmitted content and the quality of experience or service, making it challenging to balance trade-offs among decision quality, bandwidth utilization, and latency requirements. To address this issue fundamentally, this paper proposes a novel perspective by designing wireless video transmission strategies from the angle of decision quality, where only the content that impacts the decision outcomes is transmitted. The highlight of this paper is designing a lightweight yet efficient binary classifier that predicts whether the current content will change decision outcomes based on content discrepancies, measured only through pixel-level differences and macroblock-level similarity. Furthermore, these discrepancies can be used to distinguish the background, thereby further saving bandwidth by reusing the background information. Additionally, a fine-tuning module is incorporated to flexibly update the classifier model, ensuring adaptability across various scenarios. Extensive results demonstrate that the proposed strategy achieves over 81% redundant bandwidth savings while maintaining decision quality and catering to strict latency requirements on computation-constrained devices.

关键词： Correlation wireless networks Surveillance Current measurement Bandwidth Streaming media Quality of experience Internet of Things Global communication Streams

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International Symposium on Computational Intelligence and Design, ISCID

作者： Lijun Yang Chao Ding Meng Wu College of Internet of Things Nanjing University of Posts and Telecommunications Nanjing China College of Computer Science Nanjing University of Posts and Telecommunications Nanjing China Key Lab of “Broadband Wireless Communication and Sensor Network Technology” of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781509035595

The node replica attack is known to be dangerous to wireless sensor networks (WSNs) because it enables the adversary to extend the damage throughout the network with very low cost. To stop such attack, we propose a similarity estimation based scheme with group deployment knowledge. Compared with prior works, our proposal provides extra functionality that prevent replica from generating false location claims. Through simulation experiment, we evaluate the performance of the proposed scheme and demonstrate that our scheme achieves effectiveness and efficiency under different situations and attack strategies.

关键词： wireless sensor networks Authentication Telecommunications Electronic mail Measurement Encoding

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Adaptive Multi-Attention Convolutional Neural network for Fine-Grained Image Recognition

Adaptive Multi-Attention Convolutional Neural Network for Fi...

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IEEE Globecom Workshops

作者： Ang Li Jianxin Chen Bin Kang Wenqin Zhuang Xuguang Zhang College of Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China National Engineering Research Center for Communication and Information Technology (NUPT) Nanjing China Key Laboratory of Broadband Wireless Communications and Sensor Network Technology Ministry of Education (NUPT) Nanjing China

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

Fine-grained recognition is still a difficult task in pattern recognition applications due to the challenge of accurate localization of discriminative parts. Recent CNN-based methods generally utilize attention mechanism to produce attention masks without part labels/annotations and extract corresponding image parts from them. However, these methods extract the attention parts by using fixed-size rectangles to crop images regardless of the size of objects to be recognized, which will hinder the feature expression of the following Part-CNNs. In this paper, we propose an adaptive cropping module based on the information of attention masks to adjust size of cropping rectangles. The training process of adaptive cropping module and Part-CNNscan reinforce each other with the proposed rank loss and the classic softmax loss. To further balance and fuse all attention parts, we propose a part weighting module to evaluate part contributions. Under the optimization of sort loss, the part weighting module will produce part weights in the same order as prediction scores learned by attention parts. The backbone of our network is MA-CNN. Different from MA-CNN, the new proposed adaptive cropping module and part weighting module can jointly guide the framework to produce a more discriminative fine-grained feature. Experiments show that the AMA-CNN outperforms MA-CNN by 1.1% on CUB200-2011 bird dataset.

关键词： Feature extraction Agriculture Training Image recognition Shape Fuses Birds

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Tight capacity bounds for indoor visible light communications with signal-dependent noise

arXiv

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arXiv 2020年

作者： Wang, Jin-Yuan Fu, Xian-Tao Lu, Rong-Rong Wang, Jun-Bo Lin, Min Cheng, Julian Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210003 China Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai200062 China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing210003 China National Mobile Communications Research Laboratory Southeast University Nanjing211111 China School of Engineering University of British Columbia KelownaBCV1V 1V7 Canada

Channel capacity bounds are derived for a point-to-point indoor visible light communications (VLC) system with signal-dependent Gaussian noise. Considering both illumination and communication, the non-negative input of VLC is constrained by peak and average optical intensity constraints. Two scenarios are taken into account: one scenario has both average and peak optical intensity constraints, and the other scenario has only average optical intensity constraint. For both two scenarios, we derive closed-from expressions of capacity lower and upper bounds. Specifically, the capacity lower bound is derived by using the variational method and the property that the output entropy is invariably larger than the input entropy. The capacity upper bound is obtained by utilizing the dual expression of capacity and the principle of "capacity-achieving source distributions that escape to infinity". Moreover, the asymptotic analysis shows that the asymptotic performance gap between the capacity lower and upper bounds approaches zero. Finally, all derived capacity bounds are confirmed using numerical results. Copyright © 2020, The Authors. All rights reserved.

关键词： Gaussian noise (electronic)

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Scheme for realizing passive quantum key distribution with heralded single-photon sources

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Physical Review A 2016年第3期93卷 032312-032312页

作者： Qin Wang Chun-Hui Zhang Xiang-Bin Wang Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 China Department of Physics and State Key Laboratory of Low Dimensional Quantum Physics Tsinghua University Beijing 100084 China Jinan Institute of Quantum Technology Shandong Academy of Information Technology Jinan China

We present a scheme for realizing passive quantum key distribution with heralded single-photon sources. In this scheme, the idler light from the parametric down-conversion process is split into two parts and sent into two local detectors individually. Then all the clicking and nonclicking events are used to herald the arrival and nonarrival of the signal light. As a result, a precise estimation of the behavior of the single-photon pulses can be achieved without changing the light intensity. Furthermore, we compare our scheme with other existing methods with the Bennett-Brassard 1984 (BB84) protocol through numerical simulations. Our simulations demonstrate that the performance of our scheme can greatly overcome other existing practical methods and approach very close to the asymptotic case of using infinite-decoy-state methods.

关键词： Quantum cryptography

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