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检索条件"机构=Beijing Key Laboratory for Network System Architecture and Convergence"

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Experimental demonstration of software defined path for optical network

Experimental demonstration of software defined path for opti...

引用

Asia Communications and Photonics Conference, ACP 2013

作者： Cao, Bei Wang, Jinyu Guo, Junhu Li, Hui Ji, Yuefeng Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

We propose Software Defined Path (SDP) architecture based on OpenFlow (OF) technique, to achieve optical layer optimization and control flexibility. The experimental result shows the optimization and flexibility along... 详细信息

ISBN: (纸本)9781557529893

关键词： Optical amplifiers Optical devices Optical fibers Optical networks Optical signals Wavelength assignment Fiber optics and optical communications (060.0060) Optical communications (060.4510)

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Research on K Anonymity Algorithm based on Association Analysis of Data Utility 2

Research on K Anonymity Algorithm based on Association Analy...

引用

2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Yuanxiunan Gao Tao Luo Jianfeng Li Cong Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Software College Beijing University of Posts and Telecommunications

More and more medical data are shared, which leads to disclosure of personal privacy information. Therefore, the construction of medical data privacy preserving publishing model is of great value: not

ISBN: (纸本)9781467389808

关键词： Algorithm design and analysis Correlation coefficient Data privacy Principal component analysis Optimization Correlation Publishing

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Energy consumption optimization scheme of cloud data center based on SDN 8

Energy consumption optimization scheme of cloud data center ...

引用

8th International Congress of Information and Communication Technology, ICICT 2018

作者： Liao, Qing Wang, Zun Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

In response to the mobile Internet, Internet of things and cloud computing technology fast development, the operation of large-scale distributed computing cloud data center construction in the world at the same time, the network data calculation of energy consumption problem is causing extensive concern. And the software-defined network (SDN) provides a feasible solution to the rigid problem of traditional network architecture. Based on SDN technology, this paper proposes a method of energy consumption control based on cloud data center. Aiming at server energy saving, the multi-objective optimization model of virtual machine migration integration is established, and the integration mechanism of virtual machine migration based on mixed single-parent genetic algorithm is proposed. The experimental results show that the algorithm can be used to solve the problem of virtual machine migration and integration in data center. © 2018 The Authors. Published by Elsevier Ltd.

关键词： Genetic algorithms

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Degree of polarization spectrum sensing algorithm for cognitive radios

Degree of polarization spectrum sensing algorithm for cognit...

引用

2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Lin, Lin Guo, Caili Feng, Chunyan Wu, Xiaobin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications BUPT Beijing China

ISBN: (纸本)9789860334074

A new spectrum sensing algorithm-degree of polarization (DoP) sensing algorithm is proposed in this paper. By exploiting a pair of dual-polarized antenna at the receiver, DoP of the received vector signal is estimated and utilized to detect the presence of primary users (PU) based on the polarization characteristics of electromagnetic waves. This method requires no prior information of the PU signals and the channels from PUs to the secondary users (SU). Theoretical analysis of detection probability, false alarm probability and threshold of the proposed algorithm is presented in detail. The theoretical analysis also shows that our algorithm overcomes the noise uncertainty problem. Simulations based on wireless microphone signals considering different SU receiver scenarios are provided to certify the effectiveness of the proposed method. Compared with the energy detector (ED), the maximum-to-minimum ratio eigenvalue (MME) detector and the arithmetic-to-geometric mean (AGM) detector, by applying polarization information signal carries, DoP achieves a better detection performance than AGM, MME and ED with noise uncertainty. © 2012 NiCT.

关键词： Signal detection

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A Novel Soft-Output Demapper for DOCSIS 3.1 6

A Novel Soft-Output Demapper for DOCSIS 3.1

引用

6th IEEE International Conference on Computer and Communications, ICCC 2020

作者： Zheng, Feng Pang, Bowen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunication Beijing100876 China

ISBN: (纸本)9781728186351

DOCSIS 3.1, the new international standard for high-speed cable television (CATV), uses Low Density Parity Check (LDPC) code for forward error correction (FEC). It is widely known that accurate soft information is critical to the performance of LDPC decoding, but existing bit log-likelihood ratio (LLR) expression only works well under high code rate. In this paper, an improved bit LLR expression is proposed to compensate the difference between the existing LLR expression under low code rate for Gray coded M-ary quadrature amplitude modulation (QAM). In addition to high accuracy, the improved LLR is simple and efficient to manipulate. Besides LDPC, the improved LLR is also applicable to other codes that require soft information. Simulation results show that the improved LLR expression achieves a significant improvement in performance for both LDPC and Turbo decoding. © 2020 IEEE.

关键词： Quadrature amplitude modulation

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A tracker-based cache utilization strategy in CCN 26

A tracker-based cache utilization strategy in CCN

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26th IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications, PIMRC 2015

作者： Hongbao, Liu Muqing, Wu Qian, Hu Li, Peng Ning, Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing100876 China

ISBN: (纸本)9781467367820

One important feature of Content-centric networking (CCN) is to utilize built-in network caches to improve the transmission efficiency of content dissemination. In CCN, all nodes have the function of caching contents. Consequently, caches are ubiquitous and diverse. How to make full use of these caches to reduce the network load and the transmission delay has become a hot research topic in recent years. In order to speed up content distribution and improve network resource utilization, a cooperative caching strategy called Tracker-based Cache Utilization Strategy (TBCUS) is proposed in this paper. In TBCUS, an idea of partial centralized management of the caches is introduced into traditional CCN. Moreover, in order to alleviate the pressure that the incurred overhead imposes on network bandwidth, TBCUS divides the whole caching system into several sub-systems. Each of the sub-systems has a tracker server as the controller and some peers. The contents cached in a sub-system are transparent to each other through the coordination of the tracker server. Once a content request reaches to a sub-system, all the caches in the sub-system can be selected to respond to this request. While the traditional caching strategy in CCN is that only the caches on the delivery path can be used to respond to the content request. TBCUS improves the cache utilization and has higher cache hit ratio and lower transmission delay and network load compared with the traditional caching strategy. © 2015 IEEE.

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Transmission capacity for overlaid wireless networks: A homogeneous primary network versus an inhomogeneous secondary network

Transmission capacity for overlaid wireless networks: A homo...

引用

2013 International Conference on Communications, Circuits and systems, ICCCAS 2013

作者： Liu, Yang Yin, Changchuan Gao, Jing Sun, Xiaohui Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781479930517

We study the transmission capacity of two overlaid wireless ad hoc networks, where a primary network and a secondary network operate in the same geographic region and share the same spectrum. The primary network has a high priority to access the spectrum and is oblivious of the presence of the secondary network while the secondary network limits its interference to the primary network by controlling the density of its transmitters. Assuming the primary transmitter nodes are distributed as a Poisson point process and the secondary transmitter nodes are distributed as a Matern cluster process, we present an upper and a lower bounds for the transmission capacity of the primary network and that of the secondary network. Numerical results show that the transmission capacity of the primary network and that of the secondary network have a small increment due to the inhomogeneity of the secondary network. © 2013 IEEE.

关键词： Transmitters

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Low Complexity Energy-Efficient Resource Allocation in Down-link Dense Femtocell networks

Low Complexity Energy-Efficient Resource Allocation in Down-...

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IEEE 24th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Zhang, Zhicai Zhang, Haijun Zhao, Zhenmin Liu, Hui Wen, Xiangming Jing, Wenpeng Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467362351

Femtocells have attracted growing attentions in academia, industry, and standardization forums in recent years. However, most of existing works on femtocell networks are focused on spectrum efficiency and interference mitigation, energy efficiency aspect is neglected. In this paper, we investigate the maximization of energy efficiency of downlink OFDMA dense femtocell networks by efficient resource allocation. To decrease the complexity, joint subchannel allocation and power control are decomposed into two steps. Power control has been modeled as a non-cooperative game, a closed-form best response of transmit power is obtained. Considering fairness and low complexity, a fair time-averaged subchannel allocation metric have been derived out. Based on that, we propose a distributed suboptimal subchannel allocation and optimal power control algorithm. Simulation results show that the proposed algorithm has a low complexity with slight loss of energy efficiency compared with Round-Robin Scheduling and a noncooperative energy-efficient power optimization algorithm.

关键词： Energy efficiency

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Measurement-based tapped-delay-line (TDL) models for wireless channels under high speed railway scenarios at 2.6 GHz

Measurement-based tapped-delay-line (TDL) models for wireles...

引用

21st International Conference on Telecommunications, ICT 2014

作者： Qian, Wang Chunxiu, Xu Min, Zhao Siyu, Zhang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781479951413

The dramatic development of high speed railway (HSR) has spurred great interest in extensive studies on the fading characteristics of the radio channel in all the relevant scenarios. Approved by the Ministry of Railways of China, single input single output (SISO) measurements were performed at 2.6 GHz with 40 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. In this paper, we provide some fading parameters including the mean excess delay, root-mean-square (RMS) delay spread, the number of paths and the delay Doppler spectrum under diverse HSR scenarios. Plain, viaduct and hilly terrain scenarios are all involved. Based on the extensive body of measured data, tapped-delay-line (TDL) models are established to characterize the time-varying wireless channel, which can be directly employed in the evaluation and comparison of various HSR transmission projects. All these results and models are expected to provide an insight into the behaviors and performance of wireless cellular communication in HSR scenarios. © 2014 IEEE.

关键词： Railroad transportation

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Theoretical polarized channel model and analysis of XPD and polarization correlation under narrowband macrocell environment

Theoretical polarized channel model and analysis of XPD and ...

引用

2012 15th International Symposium on Wireless Personal Multimedia Communications, WPMC 2012

作者： Wu, Xiaobin Guo, Caili Feng, Chunyan Lin, Lin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9789860334074

A theoretical polarized channel model has been proposed by introducing per path polarization characterization based on geometrical depolarization theory. According to the model, polarization array response vector for narrowband macro-cell environment has been derived through intricate geometrical deduction. Mathematical expressions for polarized channel power imbalance XPD (cross polarization discrimination) and polarization correlation have been developed by using VMF (von Mises-Fisher) distribution which characterizes both azimuth and elevation angle. Numerical integration technique is used to analyze the effect of scatterers' angular characteristics including average azimuth angle, average elevation angle and angular spread on XPD and polarization correlation due to the complexity of geometrical deduction. Our analytical results agree well with previous published XPD and polarization correlation measurements and can be used to predict further XPD and polarization correlation characteristics. Analytical results indicate that both XPD and polarization correlation are highly angle-sensitive. © 2012 NiCT.

关键词： Geometry

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