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检索条件"主题词=Network coding"

共 10840 条记录，以下是1281-1290 订阅

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Maximizing network coding Opportunity through Buffer Management in Wireless networks

Maximizing Network Coding Opportunity through Buffer Managem...

引用

9th IEEE Int Conf on Internet of Things / 12th IEEE Int Conf on Green Comp and Communicat / 9th IEEE Int Conf on Cyber, Phys, and Social Comp / IEEE Int Conf on Smart Data

作者： Liu, Qinglong Wang, Gang Feng, Gang Guo, Yantao Yao, Qian Univ Elect Sci & Technol China Natl Key Lab Sci & Technol Commun Chengdu Peoples R China Sci & Technol Informat Transmiss & Disseminat Com Shijiazhuang Hebei Peoples R China

ISBN: (纸本)9781509058808

Due to asynchronous packet transmissions and rate mismatch among different coding flows in existing opportunistic network coding architectures, such as COPE, the amount of packets which can be coded together may be insufficient and thus the performance gain of network coding cannot be fully exploited. One feasible solution for this problem is to make coding node purposely delay some packet transmissions so as to increase more coding opportunities. However, extra delay could be introduced and it will impose an adverse influence on delay-sensitive applications, such as video streaming. In this paper, we propose to use buffer management to maximize the coding opportunity while meeting the delay constraints of traffic flows. We formulate the design of delaying policy as an optimization problem. Based on the model, the network-coding-aware buffer management policy (NBM) consists of packet delaying and scheduling mechanisms, and each node independently decides whether and for how long to delay a packet. Numerical results validate our analytical model and show that NBM can substantially improve the performance gain of network coding compared with COPE.

关键词： Encoding network coding Delays Throughput Wireless networks Optimization network topology

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Comparison of Selection and Maximal Ratio Combining in Cooperative network coding with AF and DF 5

Comparison of Selection and Maximal Ratio Combining in Coope...

引用

5th IEEE International Conference on Communication, networks and Satellite (COMNETSAT)

作者： Iqbal, Muhammad Suwadi Wirawan Pudjiastuti, Rina Inst Teknol Sepuluh Nopember Dept Elect Engn Surabaya Indonesia Univ Telkom Bandung Indonesia

ISBN: (纸本)9781509054466

Cooperative communication of network coding system is a technique used to overcome the problems of multipath fading, despite the obstacles that still occur are not yet optimal SNR to be good performance. In this paper the author provides a solution by considering two concepts combining which used selection combining (SC) and maximal ratio combining (MRC). By using two general strategies relay protocols of cooperative that amplify-and-forward (AF) and decode-and-forward (DF). Components of the measurement are to calculate the bit error rate (BER) and throughput. Results of the research are SC value BER better than MRC, because network coding have fading coefficient MRC becomes greater than SC only choose one of the best signal. Throughput which on using MRC and SC resulted greater value using network coding than without using network coding.

关键词： Cooperative network coding AF DF MRC and SC

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A Joint Duty Cycle and network coding MAC Protocol for Underwater Wireless Sensor networks 25

A Joint Duty Cycle and Network Coding MAC Protocol for Under...

引用

25th IEEE International Conference on Computer Communications and networks (ICCCN)

作者： Qin, Zhenquan Sun, Yingxiao Sun, Liang Wang, Lei Zhang, Wenzhe Lu, Bingxian Shu, Lei Dalian Univ Technol Sch Software Dalian Liaoning Peoples R China Guangdong Univ Petrochem Technol Guangdong Petrochem Equipment Fault Diag Key Lab Maoming Guangdong Peoples R China

ISBN: (纸本)9781509022793

Currently, various Medium Access Control (MAC) protocols have been proposed for underwater wireless sensor networks. Unlike terrestrial networks, underwater networks utilize acoustic waves, which have comparatively lower loss and longer range in underwater environments. However, the use of acoustic waves incurs long propagation delays that typically lead to low throughput especially in protocols that require receiver feedback such as multimedia stream delivery and the energy cost of transmission is much higher than receptions. Thus, collision and retransmission should be reduced in practice in order to reduce energy cost and improve throughput. Based on these motivations, we propose a novel MAC protocol called NCDCMAC. NCDC-MAC leverages network coding and duty cycle, the combination of which is seldom explored, to solve these challenges. Heterogeneous wireless networks and node roles are considered while designing our algorithms. Meanwhile, fairness including schedule and service time assignment is supported in our approach. Extensive simulations show that our approach can achieve significantly better performance.

关键词： network coding

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Combining Forward Error Correction and network coding in Bufferless networks: a Case Study for Optical Packet Switching 17

Combining Forward Error Correction and Network Coding in Buf...

引用

17th IEEE International Conference on High Performance Switching and Routing (HPSR)

作者： Biczok, Gergely Chen, Yanling Kralevska, Katina Overby, Harald Budapest Univ Technol & Econ MTA BME Future Internet RG Budapest Hungary Univ Duisburg Essen Inst Digital Signal Proc Duisburg Germany Norwegian Univ Sci & Technol Dept Telemat Trondheim Norway

ISBN: (纸本)9781479989508

Bufferless network operation is favorable in many application domains such as industrial networks, on-chip networks and optical packet switching (OPS). The main challenge with zero buffers is the avoidance or handling of contention;indeed, many domain-specific contention resolution techniques have been proposed in the literature. In this paper, we propose a generic combined forward error correction (FEC) and network coding (NC) scheme, which mitigates the negative impact of contentions at the network layer. Specifically, we present a case study for OPS utilizing FEC at the ingress node and NC at an intermediary optical packet switch to reduce packet loss due to contention. Our analysis shows that if used in a smart way, our mechanism can reduce decoding error and packet loss with multiple orders of magnitude while adhering to buffering limitations and meeting delay requirements. We believe that such a combined coding scheme has the potential to be utilized both in OPS (data center and core networks) and other networks where (near-)zero buffers are required.

关键词： network coding

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Ensuring Privacy Preservation in Wireless networks against Traffic Analysis by employing network coding and Blowfish Encryption

Ensuring Privacy Preservation in Wireless Networks against T...

引用

International Conference on Signal and Information Processing (IConSIP)

作者： Dongre, V. C. Shikalpure, S. G. Govt Engn Coll Dept Comp Sci & Engn Aurangabad Maharashtra India

ISBN: (纸本)9781509015221

Open air transmission is imperative asset of Multihop wireless network;which enables malicious attackers to do attacks such as traffic analysis. This motivates enormous need of securing privacy of MWN. The necessity of privacy issue pioneers concept of network coding. To avert traffic analysis attacks it has to be implemented which integrates coding and mixing operation at in-between nodes. Simple use of network coding is not enough to resolve privacy threat in MWN. This paper proposes random network coding scheme along with Blowfish encryption algorithm to achieve source anonymity and message data concealment. To effectively prohibit traffic analysis attacks, this algorithm enhances features of homomorphic encryption such as Paillier encryption used in existing system. This proposed system offers the feature of random coding. Property of inverting GEVs with a very high probability is used by each sink to recover the source packets. The strength and efficiency of the proposed system is evident through theoretic exploration and simulative data assessment.

关键词： Traffic analysis Privacy preservation network coding Blowfish encryption

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Experimental Assessment of Using network coding and Cooperative Diversity Techniques in IEEE 802.15.4 Wireless Sensor networks 12

Experimental Assessment of Using Network Coding and Cooperat...

引用

IEEE World Conference on Factory Communication Systems (WFCS)

作者： Valle, O. T. Budke, G. Montez, C. Pinto, A. R. Hernandez, F. Vasques, F. Vargas, F. Gatti, E. Fed Inst Santa Catarina Florianopolis SC Brazil Univ Fed Santa Catarina BR-88040900 Florianopolis SC Brazil Univ ORT URSEC Montevideo Uruguay Univ Porto FEUP INEGI Porto Portugal PUCRS Catholic Univ Rio Grande do Sul SiSC Porto Alegre RS Brazil INTI Buenos Aires DF Argentina

ISBN: (纸本)9781509023394

The use of wireless sensor networks (WSN) to support critical monitoring applications is becoming a relevant topic of interest. These networks allow a highly flexible approach to data monitoring and, consequently, a major breakthrough for several application domains, from industrial control applications to large building domotics and health care applications. One of the major impairments of using wireless networks to support critical monitoring applications is the electromagnetic noise, which may increase the packet loss ratio to unacceptable values. In this paper, we assess different techniques of cooperative communication and network coding that can be useful to mitigate the aforementioned problem. These techniques may be implemented in WSN nodes in conformance with the IEEE 802.15.4 standard, to reduce the impact of electromagnetic interferences upon the packet loss ratio. In this paper, we report an experimental assessment of the network coding and cooperative diversity techniques, where the network is subjected to a controlled electromagnetic interference inside of an anechoic chamber. The experimental results show that, by using these techniques, it is possible to increase the success rate of communication in typical electromagnetic noisy environments.

关键词： IEEE 802.15.4 network coding reliability

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Performance Analysis of Sliding Window network coding in MANET 1

引用

11th Conference on Advanced Computer Architecture (ACA)

作者： Sun, Baolin Gui, Chao Song, Ying Chen, Hua Zhu, Xiaoyan Hubei Univ Econ Sch Informat & Engn Wuhan 430205 Peoples R China Wuhan Technol & Business Univ Dept Publ Basic Course Wuhan 430065 Peoples R China Jianghan Univ Sch Math & Comp Sci Wuhan 430056 Peoples R China

ISBN: (数字)9789811022098

ISBN: (纸本)9789811022098;9789811022081

network coding (NC) enables us to mix two or more packets into a single coded packet at relay nodes and improve performances in mobile ad hoc networks (MANETs). Sliding window network coding is a variation of NC that is an addition to data packet streaming and improves the data delay on MANETs. In this paper, we propose a Sliding Window network coding in MANETs (SWNCM). SWNCM preserves the degree distribution of the encoded data packets through the recombination at the nodes. SWNCM enables to control the decoding complexity of each sliding window independently from the data packets received and recover the original data. The performance of the SWNCM is studied using NS2 and evaluated in terms of the network throughput, encoding overhead, decoding delay, packet transmission rate when data packet is transmitted. The simulations result shows that the SWNCM with our proposition can significantly improve the network throughput and achieves higher diversity order.

关键词： MANET Sliding window network coding Performance analysis

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Joint Hierarchical Modulation and network coding for Asymmetric Data Transmission in Wireless Cooperative Communication

Joint Hierarchical Modulation and Network Coding for Asymmet...

引用

International Conference on Computer, Information and Telecommunication Systems (CITS)

作者： Dai, Cui-Qin Huang, Nan-Nan Ran, Hai-Xia Chongqing Univ Posts & Telecommun Chongqing Key Lab Mobile Commun Technol Chongqing Peoples R China

ISBN: (纸本)9781509006908

Asymmetric data transmission is a challenge factor in wireless communication channel. In this paper, we study the issue of data processing in asymmetric data transmission from different sources in wireless communication channel, and propose a Joint Hierarchical Modulation and network coding (JHMNC) scheme. In the proposed scheme, the procedure of JHMNC is analyzed and compared with the traditional zero padding and Opportunistic User Selection (OUS) schemes which are the generally existed schemes in asymmetric data transmission in wireless channel, and the closed-form expressions of the End-to-End (E2E) Bit Error Rate (BER) for the aforementioned schemes are derived by analyzing the transmission of each node. Simulation results illustrate that the proposed scheme improves the BER performance without additional complexity compared with the traditional zero padding scheme, also can outperform OUS scheme in terms of the average throughput and the channel access probability.

关键词： hierarchical modulation network coding asymmetric data transmission wireless communication

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Optimal Control for network coding Broadcast 59

Optimal Control for Network Coding Broadcast

引用

59th Annual IEEE Global Communications Conference (IEEE GLOBECOM)

作者： Skevakis, Emmanouil Lambadaris, Ioannis Carleton Univ Dept Syst & Comp Engn Ottawa ON K1S 5B6 Canada

ISBN: (纸本)9781509013289

Random linear network coding (RLNC) has been shown to efficiently improve the network performance in terms of reducing transmission delays and increasing the throughput in broadcast and multicast communications. However, it can result in increased storage and computational complexity at the receivers end. In our previous work we considered the broadcast transmission of large file to N receivers. We showed that the storage and complexity requirements at the receivers end can be greatly reduced when segmenting the file into smaller blocks and applying RLNC to these blocks. To that purpose, we proposed a packet scheduling policy, namely the Least Received. In this work we will prove the optimality of our previously proposed policy, in terms of file transfer completion time, when N = 2. We will model our system as a Markov Decision Process and prove the optimality of the policy using Dynamic Programming. Our intuition is that the Least Received policy may be optimal regardless of the number of receivers. Towards that end, we will provide experimental results that verify that intuition.

关键词： network coding

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A Weakly-Secure and Reliable network coding Scheme 1

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11th International Scientific Conference on Future Information Technology (FutureTech) / 10th International Conference on Multimedia and Ubiquitous Engineering (MUE)

作者： Wu, Hao Li, Hui Song, Mengjing Peking Univ ECE Beijing Peoples R China

ISBN: (数字)9789811015366

ISBN: (纸本)9789811015366;9789811015359

It has been shown that network coding can effectively improve the throughput of multicast communication sessions in directed acyclic graphs, achieving their cut-set capacity bounds. However, network coding is highly susceptible to eavesdropping and pollution attacks in which malicious nodes attacks cannot be prevented. In this paper, we propose several ways to enhance the security and reliability of random networking coding transmission. Schemes which encrypt the random coefficients and the coding payload could ensure the information has a relatively low probability to be cracked. We also implement the reliable transmission by forward error-correction. It has been shown that random network coding with encryption and forward error-correction can help achieve provably good overall security and reliability performance.

关键词： network coding Security Reliability Error-correction

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