检索结果-内蒙古大学图书馆

Low-overhead coordination in sub-28 millimeter-wave networks

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Ghauch, Hadi Kim, Taejoon Skoglund, Mikael Fischione, Carlo Dept. of Electrical Engrng and Computer Science Univ of Kansas Lawrence United States School of Electrical Engineering Royal Inst. of Techn. KTH

In this paper, we present some contributions from our recent investigation. We address the open issue of interference coordination for sub-28 GHz millimeter-wave communication, by proposing fast-converging coordination algorithms, for dense multi-user multi-cell networks. We propose to optimize a lower bound on the network sum-rate, after investigating its tightness. The bound in question results in distributed optimization, requiring local information at each base station and user. We derive the optimal solution to the transmit and receive filter updates, that we dub non-homogeneous waterfilling, and show its convergence to a stationary point of the bound. We also underline a built-in mechanism to turn-off data streams with low SINR, and allocate power to high-SNR streams. This "stream control" is a at the root of the fast-converging nature of the algorithm. Our numerical result conclude that low-overhead coordination offers large gains, for dense sub-28 GHz systems. These findings bear direct relevance to the ongoing discussions around 5G New Radio. Copyright © 2018, The Authors. All rights reserved.

关键词： 5G mobile communication systems

Enhancement of spectral efficient modulation by hybridization of different modulation technique for fiber transmission 3

学校读者我要写书评

暂无评论

Enhancement of spectral efficient modulation by hybridizatio...

3rd International Conference on Advances in Computing, Communication and Automation (Fall), ICACCA 2017

作者： Vishwakarma, Sandeep Yadav, Preeti Samant, Pramit Computer Science and Engineering Raj Kumar Goel Inst. of Tech. Ghaziabad India Computer Science and Engineering MJP Rohilkhand University Bareilly India Computer Science and Engineering Dr. K.N. Modi I.E.T. Ghaziabad India

ISBN: (纸本)9781509064038

The request of cutting edge optical fiber correspondence frameworks is high information rate like 20 GB/s, 40 GB/s up to 100 GB/s per channel. That is extremely testing to send more channels into one single fiber channel separating needs to diminished from 250GHz to 50GHz or much littler. The consequence of that straight and nonlinear corrupting impact will be serious in such high information rate optical frameworks. The examination of a few diverse adjustment designs and produce unearthly proficient regulation configuration in rapid information rate lightwave frameworks are investigated. NRZ, RZ, Duobinary, Manchester, and Manchester Duobinary are under the proposed examine. As a matter of first importance, framework exhibitions of NRZ, RZ, Duobinary and Manchester more than a few existing transmission strands are thought about at various information rate, length and laser control and got the prevailing corrupting impact is subject to information rate;length, and laser control. Manchester Duobinary is observed to be the most spectral productive among the examined adjustment groups. Furthermore, last, examine about in what manner can enhance the Quality factor of Manchester Duobinary when information rate increment for future research. © 2017 IEEE.

关键词： Optical fibers

Rao based watermark detector through two-level hierarchical prior in transform domain 2017

学校读者我要写书评

暂无评论

Rao based watermark detector through two-level hierarchical ...

21st Pan-Hellenic Conference on Informatics, PCI 2017

作者： Mairgiotis, Antonis Koliopanos, Christos Kondi, Lisimachos P. Dept. of Computer Science and Engineering Tech. Educ. Inst. of Thessaly Larissa Greece Technological Educational Institute of Epirus Arta Greece Dept. of Computer Science and Engineering University of Ioannina Ioannina Greece

ISBN: (纸本)9781450353557

In this work, we propose a transform based blind zero-bit watermark detector, designed based on a hierarchical, two-level image prior. This model is applied through Rao hypothesis test, where we detect the hidden information with unknown amplitude. The proposed method is suitable for wavelet domain watermark detection without the need to estimate the appropriate parameters under the alternative hypothesis. The proposed system shows efficient robustness against.a variety of known attacks. The experimental results show that the proposed detector has a good performance with or without attacks in terms of ROC (receiver operating characteristics) curves compared with other known state-of-The-Art statistical detectors.

关键词： Signal processing

Cost-aware software-defined hybrid object-based storage system 18

学校读者我要写书评

暂无评论

Cost-aware software-defined hybrid object-based storage syst...

18th International Conference on Parallel and Distributed Computing, Applications and Technologies, PDCAT 2017

作者： Lu, Yung-Feng Kuo, Chin-Fu Chou, Shih-Chun Li, Jhong-Syuan Lai, Yan-Wei Department of Computer Science and Information Engineering National Taichung University of Science and Technology Taiwan Department of Computer Science and Information Engineering National University of Kaohsiung Taiwan Innovative Digitech-Enabled Applic. and Services Inst. Institute for Information Industry Taiwan

ISBN: (纸本)9781538631515

Object-based storage is a storage architecture that manages data as objects, as opposed to other storage architectures like file systems which manage data as a file hierarchy and block storage which manages data as blocks within sectors and tracks. In general, each object typically includes the data itself, a variable amount of metadata, and a globally unique identifier. Object storage seeks to enable capabilities not addressed by other storage architectures such as data replication and data distribution at object-level granularity. A distributed data store is a computer network where information is stored on more than one node, often in a replicated fashion. Recently, there are many excellent researches target on energy aware, performance-aware, and trade-of on cloud storage. However, less on the scheduling on the cost-efficient designs. This paper, aims to evaluate the data storage performance with hybrid storage. We try to provide a cost-aware scheme for tier-based hybrid storage. Our scheme can provide a proper placement for data. Thus, users and venders can use lower cost to get the performance that they need. © 2017 IEEE.

关键词： Network architecture

A novel sub-nyquist multiband signal detection algorithm for cognitive radio

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Cao, Kai Lu, Peizhong Zou, Yan Ling, Lin National Digital Switching Engineering Technological Research Center Zhengzhou450002 China Department of Computer Science and Engineering Fudan University Shanghai200433 China Southwest Inst. of Electron & Telecom. Tech. Shanghai200434 China

Wideband spectrum sensing (WSS) is an essential technology for cognitive radio. However, the sampling rate is still a bottleneck of WSS. Several sub-Nyquist sensing methods have been proposed. These technologies deteriorate in the low signal to noise ratio (SNR) regime or suffer high computational complexity. In this paper, we propose a novel sub-Nyquist WSS method based on Multi-coset (MC) sampling. We design a simple SNR-robust and low-complexity multiband signal detection algorithm. In particular, the proposed method differs the commonly used detection algorithms which are based on energy detection (ED), matched filter (MF) or cyclostationary detection (CD). We exploit the linear recurrent relation between the locations of nonzero frequencies and the DFT of the arithmetic-shifted subsampled signals. These relations can be uniquely expressed by a series of the so-called frequency locator polynomials (FLPs). The scalar of the relations is related to the bandwidths of the subsignals. Basing on this, we propose a detector for sparse multiband signals along with the method estimating carrier frequency and bandwidth. The detector does not require priori knowledge about the frequency locations of the signals of interest. Moreover, it has lower complexity of both samples and computation compared to CD in sparse case. Experimental results show the detector outperforms ED in the sub-Nyquist regime especially in low SNRs. Copyright © 2018, The Authors. All rights reserved.

关键词： Cognitive radio

First field-trial of a high capacity micro-comb based optical communications system

学校读者我要写书评

暂无评论

First field-trial of a high capacity micro-comb based optica...

45th European Conference on Optical Communication (ECOC 2019)

作者： Bill Corcoran Mengxi Tan Xingyuan Xu Jiayang Wu Thach G. Nguyen Sai T. Chu Brent E. Little Roberto Morandotti Andreas Boes Arnan Mitchell David J. Moss Department of Electrical and Computer System Engineering Monash University Clayton Australia Centre for Micro-Photonics Swinburne University of Technology Hawthorn Australia School of Engineering RMIT University Melbourne Australia Department of Physics and Material Science City University of Hong Kong Hong Kong China Xi'an Institute of Optics and Precision Mechanics Precision Mechanics of CAS Xi'an China INRS-Énergie Matériaux et Télécommunications Varennes Canada ITMO University St. Petersburg Russia Inst. of Fundamental and Frontier Sciences U. of Electronic Science and Tech. of China Chengdu China

ISBN: (纸本)9781839531859

We present the first demonstration of micro-comb based communications system in inst.lled optical fibre. Robust soliton-crystal states enable open-loop control, and achieve 32.5 Tb/s (8.2 b/s/Hz spectral efficiency) over 72.8 km, providing a path to compact, high capacity transceivers for legacy fibre, metro-area systems.

关键词：

Switch Radix Reduction and Support for Concurrent Bidirectional Traffic in RotorNets

学校读者我要写书评

暂无评论

Switch Radix Reduction and Support for Concurrent Bidirectio...

International Conference on Photonics in Switching (PS)

作者： Yitzhak Birk William M. Mellette Eitan Zahavi Electrical Engineering Dept Technion – Israel Inst. of Technology Haifa Israel Computer Science and Engr. Dept University of California San Diego San Diego CA USA Mellanox Technologies Yokneam Israel

ISBN: (纸本)9781538693933

Rotor Switches are optical switches that provide cyclic-shift permutations with a fixed round-robin schedule. They have been shown to offer high throughput while significantly reducing control complexity, making them a promising candidate for use in optical data center interconnects. We successfully address two critical challenges impeding the adoption of such circuit switched data center interconnects: 1) switch scalability, and 2) support for simultaneous 2-way connectivity to enable using low-latency protocols.

关键词： Optical switches Rotors Switching circuits Optical fiber networks Schedules Data centers

Symbol Emergence in Cognitive Developmental Systems: A Survey

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Taniguchi, Tadahiro Ugur, Emre Hoffmann, Matej Jamone, Lorenzo Nagai, Takayuki Rosman, Benjamin Matsuka, Toshihiko Iwahashi, Naoto Oztop, Erhan Piater, Justus Wörgötter, Florentin College of Information Science and Engineering Ritsumeikan University 1-1-1 Noji Higashi Shiga Kusatsu525-8577 Japan Dept. of Computer Engineering Bogazici University Istanbul Turkey Dept. Cybernetics Faculty of Electrical Engineering Czech Technical University Prague Czech Republic School of Electronic Engineering and Computer Science Queen Mary University of London United Kingdom Faculty of Informatics and Engineering The University of Electro-communications Japan Mobile Intelligent Autonomous Systems The Council for Scientific and Industrial Research The School of Computer Science and Applied Mathematics The University of the Witwatersrand South Africa Department of Cognitive and Information Science Chiba University Japan Faculty of Computer Science and Systems Engineering Okayama Prefectural University Japan Dept. of Computer Science Ozyegin University Istanbul Turkey The Dept. of Computer Science Universität Innsbruck Austria The Department for Computational Neuroscience The Bernstein Center of the University of Göttingen Inst. F. Physics Iii Germany

Humans use signs, e.g., sentences in a spoken language, for communication and thought. Hence, symbol systems like language are crucial for our communication with other agents and adaptation to our real-world environment. The symbol systems we use in our human society adaptively and dynamically change over time. In the context of artificial intelligence (AI) and cognitive systems, the symbol grounding problem has been regarded as one of the central problems related to symbols. However, the symbol grounding problem was originally posed to connect symbolic AI and sensorimotor information and did not consider many interdisciplinary phenomena in human communication and dynamic symbol systems in our society, which semiotics considered. In this paper, we focus on the symbol emergence problem, addressing not only cognitive dynamics but also the dynamics of symbol systems in society, rather than the symbol grounding problem. We first introduce the notion of a symbol in semiotics from the humanities, to leave the very narrow idea of symbols in symbolic AI. Furthermore, over the years, it became more and more clear that symbol emergence has to be regarded as a multifaceted problem. Therefore, secondly, we review the history of the symbol emergence problem in different fields, including both biological and artificial systems, showing their mutual relations. We summarize the discussion and provide an integrative viewpoint and comprehensive overview of symbol emergence in cognitive systems. Additionally, we describe the challenges facing the creation of cognitive systems that can be part of symbol emergence systems. Copyright © 2018, The Authors. All rights reserved.

关键词： Cognitive systems

Efficient realization of givens rotation through algorithm-architecture co-design for acceleration of qr factorization

学校读者我要写书评

暂无评论

arXiv 2018年

作者： Merchant, Farhad Vatwani, Tarun Chattopadhyay, Anupam Raha, Soumyendu Nandy, S.K. Narayan, Ranjani Leupers, Rainer Farhad Merchant and Rainer Leupers Are with Inst. for Commun. Technologies and Embedded Systems Rwth Aachen University Germany Tarun Vatwani and Anupam Chattopadhyay Are with School of Computer Science and Engineering Nanyang Technological University Singapore Indian Institute of Science Bangalore India Morphing Machines Pvt. LTd.

We present efficient realization of Generalized Givens Rotation (GGR) based QR factorization that achieves 3-100x better performance in terms of Gflops/watt over state-of-the-art realizations on multicore, and General Purpose Graphics Processing Units (GPGPUs). GGR is an improvement over classical Givens Rotation (GR) operation that can annihilate multiple elements of rows and columns of an input matrix simultaneously. GGR takes 33% lesser multiplications compared to GR. For custom implementation of GGR, we identify macro operations in GGR and realize them on a Reconfigurable Data-path (RDP) tightly coupled to pipeline of a Processing Element (PE). In PE, GGR attains speed-up of 1.1x over Modified Householder Transform (MHT) presented in the lit ENGLerature. For parallel realization of GGR, we use REDEFINE, a scalable massively parallel Coarse-grained Reconfigurable Architecture, and show that the speed-up attained is commensurate with the hardware resources in REDEFINE. GGR also outperforms General Matrix Multiplication (gemm) by 10% in-terms of Gflops/watt which is counter-intuitive. Copyright © 2018, The Authors. All rights reserved.

关键词： Factorization