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Ad-Hoc and Sensor networks Symposium

作者： Rongqing Zhang Xiang Cheng Liuqing Yang Department of Electrical & Computer Engineering Colorado State University State Key Laboratory of Advanced Optical Communication Systems & Networks School of Electronics Engineering and Computer Science Peking University

ISBN: (纸本)9781479966653

In this paper, we investigate the physical layer security issue in Device-to-Device (D2D) communications underlaying cellular networks. In order to optimize the system secrecy rate of the cellular secure communication, we derive the optimal joint power control solutions of both the cellular communication links and D2D pairs in terms of the secrecy capacity. Furthermore, we propose a secrecy-based joint power and access control (JPAC) scheme with optimum D2D pair selection mechanism that can achieve an improved network secrecy performance with very low computational complexity. Simulation results validate the efficiency of the proposed secrecy-based JPAC scheme.

关键词： Cellular networks Physical layer access control Privacy communication system security communication Research Joints Joints Device-to-device communication system Failure Rate

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Radio Resource Allocation for Device-to-Device Underlay communication Using Hypergraph Theory

Radio Resource Allocation for Device-to-Device Underlay Comm...

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作者： Zhang, Hongliang Song, Lingyang Han, Zhu State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing100871 China Department of Electrical and Computer Engineering University of Houston HoustonTX77004 United States Department of Computer Science University of Houston HoustonTX77004 United States

Device-to-device (D2D) communication has been recognized as a promising technique to offload the traffic for the evolved Node B (eNB). However, D2D transmission as an underlay causes severe interference to both the cellular and other D2D links, which imposes a great technical challenge to radio resource allocation. Conventional graph based resource allocation methods typically consider the interference between two user equipments (UEs), but they cannot model the interference from multiple UEs to completely characterize the interference. In this paper, we study channel allocation using hypergraph theory to coordinate the interference between D2D pairs and cellular UEs, where an arbitrary number of D2D pairs are allowed to share the uplink channels with the cellular UEs. Hypergraph coloring is used to model the cumulative interference from multiple D2D pairs, and thus, eliminate the mutual interference. Simulation results show that the system capacity is significantly improved using the proposed hypergraph method in comparison to the conventional graph based one. © 2002-2012 IEEE.

关键词： Resource allocation

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Quasi-static time-slot allocation in hybrid optical packet/circuit switched networks

Quasi-static time-slot allocation in hybrid optical packet/c...

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Asia communications and Photonics Conference, ACPC 2015

作者： Liao, Wenjiao Sun, Weiqiang Xiao, Shilin Feng, Zhangxiao State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

We propose a quasi-static time-slot allocation scheme in hybrid optical packet/circuit switched networks. We study the utilization and latency performance of this scheme. Both the theoretical and simulation results ve... 详细信息

ISBN: (纸本)9781943580064

关键词： Packet networks

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A compact optical clock scheme based on caesium atomic beam

A compact optical clock scheme based on caesium atomic beam

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IEEE International Frequency Control Symposium

作者： Shengnan Zhang Xiaogang Zhang Zhaojie Jiang Duo Pan Xiang Peng Haijun Chen Jingbiao Chen Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China National Key Laboratory of Science and Technology on Vacuum Electronics Beijing Vacuum Electronics Research Institute Beijing China

ISBN: (纸本)9781509020928

We report a compact optical clock scheme based on caesium (Cs) atomic beam, which extends the application of Cs from microwave frequency standard to optical frequency standard. Considering the 1.2 MHz narrow natural-linewidth of the excited state 7P 1/2 and 7P 3/2 , we can lock the laser frequency on the 455 nm or 459 nm transition line with the method of saturated absorption spectroscopy (SAS) to achieve a compact optical clock. Under the condition of 1.4 MHz narrow-linewidth laser spectrum and 100,000 signal to noise ratio (SNR), the limited stability of the compact Cs optical clock is expected to be 2.2×10 -14 at 1 s. The performance of this Cs optical clock is superior to that of hydrogen atomic clock. Compared with the traditional Cs atomic clocks, the compact Cs optical clock has potentially better stability.

关键词： Calibration Receivers Correlation Global Positioning system Delays Software Uncertainty

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Coherent pulse stacking extension of CPA to 9ns effectively-long stretched pulse duration

Coherent pulse stacking extension of CPA to 9ns effectively-...

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Conference on Lasers and Electro-Optics (CLEO)

作者： John Ruppe Siyun Chen Tong Zhou Morteza Sheikhsofla Zhigang Zhang Guoqing Chang Franz Kärtner John Nees Almantas Galvanauskas Center for Ultrafast Optical Science University of Michigan Ann Arbor Michigan USA State Key Laboratory of Advanced Optical Communication System and Networks Peking University Beijing China DESY Center for Free-Electron Laser Science Hamburg Germany

Coherent pulse stacking with a 9ns effectively-long burst of equal amplitude chirped pulses into a single pulse using a compact cascade of four Gires-Tournois interferometers is experimentally demonstrated with a fibe... 详细信息

ISBN: (纸本)9781943580118

关键词： optical fiber amplifiers Stacking Chirp Phase modulation Cavity resonators optical fiber networks

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Practical security of continuous-variable quantum key distribution with finite sampling bandwidth effects

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Physical Review A 2016年第2期93卷 022315-022315页

作者： Chao Wang Peng Huang Duan Huang Dakai Lin Guihua Zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Key Laboratory on Navigation and Location-Based Service and Center of Quantum Sensing and Information Processing (QSIP) Shanghai Jiao Tong University Shanghai 200240 China College of Information Science and Technology Northwest University Xi'an 710127 Shanxi China

Practical security of the continuous-variable quantum key distribution (CVQKD) system with finite sampling bandwidth of analog-to-digital converter (ADC) at the receiver's side is investigated. We find that the finite sampling bandwidth effects may decrease the lower bound of secret key rate without awareness of the legitimate communicators. This leaves security loopholes for Eve to attack the system. In addition, this effect may restrains the linear relationship of secret key bit rate with repetition rate of the system; subsequently, there is a saturation value for the secret key bit rate with the repetition rate. To resist such kind of effects, we propose a dual sampling detection approach in which two ADCs are employed so that the finite sampling bandwidth effects are removed.

关键词： Quantum cryptography Quantum information processing with continuous variables

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Continuous-variable quantum key distribution based on a plug-and-play dual-phase-modulated coherent-states protocol

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Physical Review A 2016年第3期94卷 032305-032305页

作者： Duan Huang Peng Huang Tao Wang Huasheng Li Yingming Zhou Guihua Zeng State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai 200240 China College of Information Science and Technology Northwest University Xi'an 710127 Shaanxi China

We propose and experimentally demonstrate a continuous-variable quantum key distribution (CV-QKD) protocol using dual-phase-modulated coherent states. We show that the modulation scheme of our protocol works equivalently to that of the Gaussian-modulated coherent-states (GMCS) protocol, but shows better experimental feasibility in the plug-and-play configuration. Besides, it waives the necessity of propagation of a local oscillator (LO) between legitimate users and generates a real local LO for quantum measurement. Our protocol is proposed independent of the one-way GMCS QKD without sending a LO [Opt. Lett. 40, 3695 (2015); Phys. Rev. X 5, 041009 (2015); Phys. Rev. X 5, 041010 (2015)]. In those recent works, the system stability will suffer the impact of polarization drifts induced by environmental perturbations, and two independent frequency-locked laser sources are necessary to achieve reliable coherent detection. In the proposed protocol, these previous problems can be resolved. We derive the security bounds for our protocol against collective attacks, and we also perform a proof-of-principle experiment to confirm the utility of our proposal in real-life applications. Such an efficient scheme provides a way of removing the security loopholes associated with the transmitting LO, which have been a notoriously hard problem in continuous-variable quantum communication.

关键词： Quantum cryptography Quantum information processing with continuous variables

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Terabit coherent optical transmission of Nyquist PDM 64-QAM signal

Terabit coherent optical transmission of Nyquist PDM 64-QAM ...

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Optoelectronic Devices and Integration, OEDI 2015

作者： Zhang, Fan Wang, Dan Ding, Rui Zhu, Lixin Chen, Zhangyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

We report an experimental terabit coherent optical transmission system with 1.25Tb/s Nyquist PDM 64-QAM signal. This is achieved over 400km standard single-mode fiber with erbium-doped fiber amplifier only amplificati... 详细信息

ISBN: (纸本)9781943580019

关键词： Pulse width modulation

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Demonstration of 1-to-72 multicasting (8 wavelengths × 9 orbital angular momentum modes) of DMT QPSK signal in a free-space IM-DD system

Demonstration of 1-to-72 multicasting (8 wavelengths × 9 or...

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Asia communications and Photonics Conference, ACPC 2015

作者： Zhu, Yixiao Zou, Kaiheng Wang, Dan Zhang, Fan State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

We investigate the performance of free-space discrete multi-tone (DMT) modulation and direct detection system. 1-to-72 multicasting (8 wavelengths × 9 OAM modes) of 17.875 Gb/s DMT QPSK signal is demonstrated and... 详细信息

ISBN: (纸本)9781943580064

关键词： Multicasting

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Secure Relay Beamforming with Correlated Channel Models in Dual-hop Wireless communication networks

Secure Relay Beamforming with Correlated Channel Models in D...

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IEEE Global communications Conference

作者： Zhenhua Yuan Chen Chen Lin Bai Ye Jin Jinho Choi State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University School of Electronic and Information Engineering Beihang University School of Information and Communications Gwangju Institute of Science and Technology (GIST)

ISBN: (纸本)9781509013296

In this article, the authors focus on a correlated channel model for secure relay beamforming in the relay-eavesdropper network. In this network, a single-antenna source-destination pair transmits secure information with the help of a amplify-and-forward (AF) relay equipped with multiple antennas. The relay cannot obtain the instantaneous channel state information (CSI) of the eavesdropper. The relay only have the knowledge of correlation information between the legitimate and eavesdropping channels. Depending on this information, we derived the conditional distribution of the eavesdropping channel. Three beamformers at the relay are studied: the zero-forcing (ZF) beamformer, the generalized match-forward (GMF) beamformer and the general-rank beamformer (GRBF). The authors found that the ZF beamformer is invalid in this system, and the GMF beamformer is the optimal rank-1 beamformer, and the GRBF is the iteratively optimal beamformer. Numerical results are presented to illustrate three beamformers' performance, and the impacts of different parameters, especially the channel correlation, on the system performance are analyzed.

关键词： relay channel model Wireless networks Secure system performance Beamforming beamformers Glia Maturation Factor Wire tapping zero frequency information

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