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International Conference on wireless communications and Signal Processing

作者： Yidan Zhuang Su Zhao Xiaorong Zhu Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education (Nanjing University of Posts & Telecommunications)

ISBN: (纸本)9781467358309

Femtocell networks which use femtocell access point (FAP) and existing networks as backhaul connectivity can meet the requirement of high data rate for wireless communication system as well as solve the indoor coverage problem. The handover from femtocell to femtocell is quite demanding and complicated because there are hundreds of possible target FAPs when mobile station (MS) moves out from the coverage of its serving FAP. In this paper, we propose a new mechanism for femtocell-to-femtocell handover which considers several factors such as received signal level, the hidden FAP problem and the access mode of femtocell. The simulation results show that our proposed scheme has a lower handover failure rate and a smaller neighbor femtocell list than the traditional scheme which is based on received signal level only.

关键词： handover femtocell received signal strength indicator femtocell access point

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Resource Allocation Scheme for Device-to-Device Communication Underlying LTE Downlink network

Resource Allocation Scheme for Device-to-Device Communicatio...

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International Conference on wireless communications and Signal Processing

作者： Ran An Jun Sun Su Zhao Shixiang Shao Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education (Nanjing University of Posts & Telecommunications)

ISBN: (纸本)9781467358309

Future cellular networks such as IMT-Advanced are expected to allow Device-to-Device (D2D) communication as an underlay. During the downlink period, both of the D2D receiver and cellular user will suffer from interference caused by radio resource sharing. In this paper, a joint resource allocation and resource reuse scheme is investigated, in which resource allocation to cellular users is employed on proportional fair algorithm and resource reuse to D2D users is employed on a greedy heuristic algorithm. The greedy heuristic algorithm determines the D2D mode is appropriate or not by path loss comparison, then decreases the interference to cellular user by selection of the minimum channel gain between cellular user and D2D transmitter each time. System simulations in two different scenarios demonstrate that sum throughput of cellular user and D2D pair is improved using the proposed scheme, and the interference to cellular user is under control.

关键词： Device-to-Device resource allocation mode selection resource reuse interference control

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Energy-efficient resource allocation for uplink OFDMA systems using correlated equilibrium

Energy-efficient resource allocation for uplink OFDMA system...

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2012 IEEE Global communications Conference (GLOBECOM)

作者： Dan Wu Liang Zhou Yueming Cai Joel Rodrigues Institute of Communications Engineering PLA University of Science and Technology Nanjing China The Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China National Mobile Communications Research Laboratory Southeast University Nanjing China Instituto de Telecomunicaçőes University of Beira Interior Portugal

In this work, we propose a correlated equilibrium (CE)-based energy-efficient resource allocation scheme for uplink OFDMA systems. At first, we construct an energy-efficient resource allocation game, where each subcarrier is viewed as a player to choose the most satisfying user, and the objective is to balance the tradeoff between the total energy efficiency and the fairness. Since the CE can achieve better performance by helping the non-cooperative players coordinate their strategies, we employ the CE to analyze the proposed game. Next, we derive the condition under which the CE is Pareto optimal and employ linear programming duality to show its closed-form expressions. Furthermore, we present a linear programming method and a distributed algorithm based on the regret matching procedure to implement the CE, respectively. Simulation results demonstrate that our scheme is able to achieve good convergence, Pareto optimality, and fairness.

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IOT platform-oriented Socket design and optimization

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2012年第SUPPL. 1期42卷 290-294页

作者： Wang, Kun Yu, Yue Zhang, Yu-Hua Guo, Huang Wang, Lin-Lin Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

An efficient design for a Socket server with buffer pool and a thread pool for concurrent request on the IOT platform is presented. This reduces the system overhead and buffer usage to the largest extent while faced with a large number of connections and digital requests. The simulation results show that a Socket server with a thread pool and buffer pool could lower the overhead on the context switch of threads as well as the I/O blocking.

关键词： Lakes

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Packet sending algorithm based on bundle protocol in DTN networks

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and technology Edition) 2012年第SUPPL. 1期42卷 285-289页

作者： Wang, Kun Yu, Yue Zhang, Yu-Hua Guo, Huang Wang, Lin-Lin Key Lab. of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

Bundle and block were introduced into DTN transmission protocol, which shred data into bits to deal with frequent interruption in DTN network. Bundle and LTP protocol in DTN transmission layer were put forward, and the impact of block size on transmission efficiency was investigated when network environment probably vary dramatically in a short time. Finally we put forward a Bundle sending algorithm that dynamically changes its strategy in DTN network to achieve the best transmission efficiency and system performance. Simulation results show that selecting proper size of data block can increase the transmission effectiveness.

关键词： Efficiency

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Resource allocation algorithm for uplink OFDMA-based cognitive radio systems

Resource allocation algorithm for uplink OFDMA-based cogniti...

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2011 IEEE 3rd International Conference on Communication Software and networks, ICCSN 2011

作者： Wang, Yanping Yang, Longxiang Liu, Xu Jiangsu Key Lab of Wireless Communications Nanjing University of Posts and Telecommunications Nanjing China Key Lab of Broadband Wireless Communications and Sensor Network Technology Nanjing China

ISBN: (纸本)9781612844855

This context addresses the subcarrier and power allocation problem in the uplink of an OFDMA system under the cognitive radio environment. The objective is to maximize the sum transmission rate of secondary users, without causing adverse interference to the primary users. We formulate the optimization problem subject to the individual power constraints and the interference constraints. We also propose two suboptimal power loading algorithms that are less complex and a new subcarrier allocation algorithm. The performance of the optimal scheme is compared with the performance of the suboptimal. Simulation results show that the optimal algorithm significantly improves the sum transmission rate, and provides good convergence. © 2011 IEEE.

关键词： Cognitive radio

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Multi-user cooperative communication based on linear network coding

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Journal of Computational Information Systems 2012年第2期8卷 801-807页

作者： Lv, Zheng Yu, Zhijun Liu, Haitao Key Lab. of Wireless Sensor Network and Communications Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China Wuxi SensingNet Industrialization Research Institute Wuxi 214135 China Software Engineering Institute East China Normal University Shanghai 200063 China

Cooperative communication is one of the most efficient ways to improve reliability of wireless links. We introduce linear network coding into multi-user cooperative communication system, and propose a new cooperating protocol. In the first phase, each user in the cooperative communication system transmits its own data, because of broadcast nature of wireless channel, the other users can overhear this data;in forwarding phase, each cooperating user encodes all the data from the other users and its own data together by linear network coding, and forwards this coded packet. Theoretical analysis and simulation show that, compared to traditional protocol based on XOR-network-coding, our protocol can achieve higher diversity order and lower system outage probability. 1553-9105/Copyright © 2012 Binary Information Press.

关键词： network coding

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Efficient two-step entanglement concentration for arbitrary W states

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Physical Review A 2012年第4期85卷 042302-042302页

作者： Yu-Bo Sheng Lan Zhou Sheng-Mei Zhao Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Telecommunications & Information Engineering 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 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

We present two two-step practical entanglement concentration protocols for concentrating an arbitrary three-particle less-entangled W state into a maximally entangled W state assisted with single photons. The first protocol uses the linear optics and the second protocol adopts the cross–Kerr nonlinearity to perform the protocol. In the first protocol, based on the postselection principle, three parties say Alice, Bob, and Charlie in different distant locations can obtain the maximally entangled W state from the arbitrary less-entangled W state with a certain success probability. In the second protocol, the parties are not required to possess the sophisticated single-photon detectors and the concentrated photon pair can be retained after performing this protocol successfully. Moreover, the second protocol can be repeated to get a higher success probability. Both protocols may be useful in practical quantum-information applications.

关键词： Photons

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Efficient single-photon-assisted entanglement concentration for partially entangled photon pairs

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Physical Review A 2012年第1期85卷 012307-012307页

作者： Yu-Bo Sheng Lan Zhou Sheng-Mei Zhao Bao-Yu Zheng Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China College of Telecommunications & Information Engineering 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 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

We present two realistic entanglement concentration protocols (ECPs) for pure partially entangled photons. A partially entangled photon pair can be concentrated to a maximally entangled pair with only an ancillary single photon with a certain probability, while the conventional ECPs require two copies of partially entangled pairs at least. Our first protocol is implemented with linear optics and the second protocol is implemented with cross-Kerr-nonlinearities. Compared with other ECPs, they do not need to know the accurate coefficients of the initial state. With linear optics, it is feasible with current experiments. With cross-Kerr-nonlinearities, it does not require sophisticated single-photon detectors and can be repeated to get a higher success probability. Moreover, the second protocol can get the higher entanglement transformation efficiency and it may be the most economical protocol by far. Meanwhile, both protocols are more suitable for multiphoton system concentration because they need less operations and classical communications. All these advantages make the two protocols useful in current long-distance quantum communications.

关键词： QUANTUM entanglement NONLINEAR theories PROBABILITY theory MULTIPHOTON processes QUANTUM communication OPTICAL communications

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BIPR: A new TCP variant over satellite networks

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Journal of China Universities of Posts and Telecommunications 2011年第SUPPL. 1期18卷 34-39页

作者： Xiao, Fu Sun, Li-Juan Wang, Ru-Chuan Fang, Yue-Chao College of Computer Science and Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China

Standard TCP perform poorly in satellite networks since the long delay, high bit error ratio and other characters. A new TCP variant, called BIPR for satellite networks is presented in this paper. Using the binary increase of window growth function, long bandwidth-delay product can be overcome, while probe method is also adopted in BIPR for conquer the high bit error rates in satellite links. Simulation results show that good performances in terms of throughput, link utilization and RTT fairness can be achieved in satellite networks using our method. © 2011 The Journal of China Universities of Posts and Telecommunications.

关键词： Satellites

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