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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Fulong Jiang Hao Liu National ASIC System Engineering Research Center Southeast University Nanjing China Jiangsu Provincial Key Laboratory of Sensor Network Technology Southeast University in Wuxi Wuxi China

ISBN: (纸本)9781479913275

In this paper, we propose a new asynchronous MAC protocol, the AW-MAC, for bulk-data collection in wireless sensor networks. We develop a routing-enhanced adaptive wakeup mechanism and an on-demand channel assignment scheme that allow the protocol to transform from single channel asynchronous schedule to multi-channel TDMA schedule in an on-demand fashion. These schemes overcome the sleep latency problem of duty-cycling and avoid the inefficiency of unscheduled asynchronous channel access. The simulation results show that our protocol largely reduces the latency on collecting bulk data then the state-of-the-art asynchronous duty-cycle MAC protocol while consuming similar energy.

关键词： Media Access Protocol Wireless sensor networks Packet loss Schedules Receivers

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Background Calibration in Pipelined SAR ADCs Exploiting PVT-Tracking Metastability Detector

Background Calibration in Pipelined SAR ADCs Exploiting PVT-...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Lizhen Zhang Jianhui Wu National ASIC Research Center Southeast University Nanjing China Jiangsu Provincial Key Laboratory of sensor network technology Southeast University Nanjing China

A dither-based digital background calibration exploiting metastability detector (MD) to correct capacitor mismatch error and gain error in pipelined successive approximation register (SAR) analogue-to-digital converters (ADCs) is proposed. The comparator resolving time is utilized for dither injection only when the residue is in the vicinity of the comparator threshold, thereby minimizing the loss of dynamic range. Besides, the residue amplifier is reused as a delay reference to construct the MD. By executing a dedicated delay- control calibration, the MD realizes a robustness against process, voltage, and temperature (PVT) variations. In addition, this paper also introduces the circuit design of the PVT-tracking MD. The schematic-based simulation results show that the delay- control calibration converges within thousands of decision cycles. The proposed bit-weight calibration is verified in a 14-bit pipelined SAR ADC. Behavioral simulation results show that, with calibration, the signal to noise and distortion ratio (SNDR) is improved from 58.2 to 79.1 dB and spurious-free dynamic range (SFDR) is increased from 64.5 to 97.1 dB.

关键词： Simulation Detectors Dynamic range Robustness Calibration Delays Convergence

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An Optimization Algorithm Based on GA for Multicast network

An Optimization Algorithm Based on GA for Multicast Network

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IEEE International Conference on Automation, Electronics and Electrical engineering (AUTEEE)

作者： Along Xu Linghua Zhang College of Telecommunication & Information Engineering NJUPT Nanjing China Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology Nanjing China

ISBN: (纸本)9781538678626;9781538678619

In the traditional wireless sensor network (WSN), the multicast router uses the store-and-forward mode to transmit data, which limits the throughput of the wireless sensor network. In 2000, the network coding is proposed by Rudolf Ahlswede, Li Shuoyan et al. Therefore, the wireless sensor network can reach the theoretical maximum throughput, save energy and improve the security of data transmission. However, network coding operations involve complex data operations. Excessive coding consumes a large amount of computer CPU and memory resources. Therefore, how to reduce the number of network coding to reduce the computational cost is a prerequisite academic problem on the premise of reaching rate of multicast. An extremely important academic research issue is called network Coding Resource Minimization (NCRM). Aiming at the NCRM problem in static wireless sensor networks, this paper proposes an improved path-relinking optimization algorithm based on genetic algorithm, which can locate the initialization parameters to the feasible solution region and adopt local search method to search optimal solution. The strategy further enhances the search ability of chromosomes in optimization algorithm. Experiments show that this algorithm spends less coding times and calculation time than the traditional simple genetic algorithm when achieving the same network throughput.

关键词： Biological cells network coding Genetic algorithms Wireless sensor networks Encoding Throughput Optimization

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Optimization of SEP Protocol Based on Relative Residual Energy

Optimization of SEP Protocol Based on Relative Residual Ener...

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International Symposium on Computational Intelligence and Design, ISCID

作者： Chenghui Wu Linghua Zhang College of Telecommunication & Information Engineering NJUPT Nanjing China Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology Nanjing China

This paper proposes an improved cluster head election algorithm, which mainly solves the problem that the Stable election protocol (SEP), a network topology protocol for wireless sensor networks (WSN), does not take the available energy of nodes into account after the first round election. This solution may cause the node which has less energy to act as the cluster head, causing a problem that this node may be invalid due to excessive energy consumption. In this paper, the relative residual energy is taken as a factor to consider to achieve the purpose of optimizing the network performance. The simulation results indicate that the algorithm has better performance from the perspective of rational use of energy and extension of network life cycle.

关键词： Computational intelligence Design optimization Protocols

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0.5 V 4.8 GHz CMOS LC VCO for WSN application

Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of ...

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Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and technology (Natural Science Edition) 2012年第6期13卷 611-614页

作者： Li, Zhi-Qun Zhao, Sheng Institute of RF and OE-ICs Southeast University Nanjing 210096 China Engineering Research Center of RF-ICs and RF-Systems Ministry of Education Southeast University Nanjing 210096 China Jiangsu Provincial Key Laboratory of Sensor Network Technology Wuxi 214135 China

A 0.5 V 4.8 GHz CMOS LC VCO for WSN application was designed. The VCO uses traditional differential negative-resistance structure. With a switched capacitor array, VCO achieves a large tuning range. Thanks to the combination of voltage-boosting circuit, VCO can have a control voltage larger than the supply voltage. Several technologies like width-length-ratio-adjusting of the transistors were used to optimize phase noise performance. The VCO uses 0.13 μm CMOS technology. The proposed VCO achieves a phase noise less than -115 dBc/Hz@1 MHz, and -121.2 dBc/Hz at most and consumes about 2.6 mA core current at 0.5 voltage supply. The performance of VCO meets the requirement of the design target.

关键词： Phase noise

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Optimization Clustering Algorithm Based on Multi-factor Improved SEP in WSN

Optimization Clustering Algorithm Based on Multi-factor Impr...

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International Symposium on Computational Intelligence and Design, ISCID

作者： Runhua Wang Linghua Zhang College of Telecommunication & Information Engineering NJUPT Nanjing China Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology Nanjing China

ISBN: (数字)9781728146539

ISBN: (纸本)9781728146546

Stable Election Protocol(SEP) algorithm is often used to divide the sensors into clusters in Wireless sensor network(WSN).This paper proposes an improved SEP protocol that can divide cluster by comprehensively considering the influence of remaining energy, signal strength, and distribution density on WSN energy consumption. It can be proved by the exprimental results that the method can effectively save the power and extend the usage time of WSNs.

关键词： Wireless sensor networks Protocols Clustering algorithms Voting Energy consumption Temperature sensors

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An Improved Protocol Based on Directed Diffusion Routing Protocol with network Coding 2019

An Improved Protocol Based on Directed Diffusion Routing Pro...

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Proceedings of the 2019 8th International Conference on networks, Communication and Computing

作者： Weixin Huang Linghua Zhang College of Telecommunication & Information Engineering NJUPT Nanjing China Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology Nanjing China

ISBN: (纸本)9781450377027

The emergence of network coding technology is not too early. This technology emerged in the information field in recent years. It is a data storage technology that combines routing and coding to improve transmission efficiency by additionally encoding data at intermediate nodes[1]. This kind of new technology is able to enhance data throughput, cut down node energy consumption, and achieve energy balance by utilizing the inherent spatial diversity and data redundancy features of WSN. Routing protocol is an important technology in the design of wireless sensor networks. Aiming at the traditional directed diffusion routing protocol (DD), this paper analyzes the problem that the original protocol costs too much in energy and time, and proposes an efficient and energy-saving improved directed diffusion routing protocol NC-DD (network Coding-DD). This protocol solves the problem of excessive energy consumption when the node works caused by a improper forwarding strategy in the original protocol. Experiments show that the NC-DD protocol model can effectively enhance data throughput and cut down time and energy overhead

关键词： Energy consumption Interest diffusion NC-DD model Random linear network coding

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A hybrid opportunistic Routing Scheme based on nodes grouping strategy for VANETs in Urban Scenarios

A hybrid opportunistic Routing Scheme based on nodes groupin...

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International Conference on Wireless and Optical Communications ( WOCC)

作者： Yuanfa Xie Jianmin Bao Zhihua Song Ya Zhou Bell Honors School Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology Nanjing China

The increasing mobile devices with better wireless communication facilities trends to be a good opportunity for the development of vehicular ad-hoc networks (VANETs). The opportunistic routing protocols are generally developed from the Delay Tolerant network (DTN). In this paper, we propose an opportunistic routing algorithm called RSUS (Routing Scheme for Urban Scenarios) based on a grouping strategy which considers both internal property and external contacts of nodes. The nodes of network are divided into super nodes, backbone nodes and ordinary nodes. Each type of nodes uses different routing strategy respectively. Then simulations were carried out by the ONE simulator and evaluations compared with the traditional single opportunistic algorithms. Furthermore RSUS was simulated in three different cities. Results show that RSUS algorithm can obtain the optimal performance with a low network overhead ratio and a high delivery rate, it is also suitable for different urban scenarios.

关键词： Routing Urban areas Algorithm design and analysis Wireless communication Ad hoc networks Delays Optical fiber communication

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Optimization of Spin Protocol Combined with network Coding

Optimization of Spin Protocol Combined with Network Coding

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IEEE International Conference on Communication and Information Systems (ICCIS)

作者： Daren Bi Linghua Zhang Nanjing University of Posts and Telecommunications Nanjing China Jiangsu Provincial Engineering Research Center of Telecommunications and Network Technology Nanjing China

ISBN: (数字)9781728162973

ISBN: (纸本)9781728162980

For classic wireless sensor networks (WSN), the received data is only stored and forwarded by nodes [1]. Existing research has shown that network coding can make the nodes form a store-encode-forward mode, which is a great improvement on the performance of wireless sensor networks. According to the above analysis, this paper chooses the SPIN protocol as our research object and looks for opportunities to use the network coding in the SPIN protocol when the intermediate node broadcasts the ADV message [2]. On this basis, this paper proposes a new improved routing protocol NC-SPIN based on network coding. Through simulation experiments, it can be found that the NC-SPIN routing protocol has improved throughput and communication performance and decreased energy consumption at intermediate nodes compared to the SPIN protocol.

关键词： network coding Encoding Wireless sensor networks Metadata Throughput Routing protocols

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Joint DBF and SAO parallel filtering based on multithread load balancing

Joint DBF and SAO parallel filtering based on multithread lo...

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2020 International Symposium on Automation, Information and Computing, ISAIC 2020

作者： Ma, Hao Hu, Dong Li, Yi Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing210003 China Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing210003 China Education Ministry’s Engineering Research Center of Ubiquitous Network and Heath Service Nanjing University of Posts and Telecommunications Nanjing210003 China

This paper presents a joint parallel loop filtering algorithm based on multi-thread load balancing in HEVC decoding, which implements the parallel processing of deblocking filtering (DBF) and sample adaptive compensation (SAO). Because of the diversity of video, the texture of different regions in an image is also different, which leads to various CTU partition methods. Therefore, the number of the boundary to be filtered is greatly different, resulting the computation load among multiple threads unbalanced in parallel processing. To solve this problem, an area division scheme is proposed, which divides the image into multiple areas, and the number of boundaries to be filtered in each area is similar. Then, the mapping relationship table is used to allocate these areas to multiple threads for parallel processing, so as to achieve the load balancing among the filtering threads. Finally, the cache technology is used to combine DBF and SAO to reduce the delay between them and improve the overall parallelism of the loop filter. Experimental results show that the performance of the proposed load balancing joint filtering algorithm is 8.15% higher than the previous scheme. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Textures

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