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A cellular based mobile location tracking system

A cellular based mobile location tracking system

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Pi-Chun Chen Wireless Information Network Laboratory (WINLAB) Department of Electrical and Computer Engineering Rutgers University USA

We propose a cellular-based location tracking system to make the best use of the range measurements and the supplementary information obtainable in cellular systems. The tracking system employs a Kalman filter for its flexibility in taking intermittent measurements and auxiliary information. Past location estimates and sector information are used to relax the minimum number of range measurements required, and therefore broaden the location coverage area. We analyze the probability of resolving the ambiguity when only two range measurements are available. A non-line-of-sight (NLOS) mitigation algorithm developed by Pi-Chun Chen (see IEEE WCNC, 1999) is used to improve erroneous location estimates corrupted by NLOS errors. The performance of the proposed cellular based location tracking system is evaluated through simulations.

关键词： Area measurement Velocity measurement Laboratories Cellular networks Time measurement Transceivers Bandwidth Interference Diffraction Scattering

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From HiPPI-800 to HiPPI-6400: A changing of the guard and gateway to the future 6

From HiPPI-800 to HiPPI-6400: A changing of the guard and ga...

引用

6th International Conference on Parallel Interconnects, PI 1999

作者： Tolmie, D. Boorman, T.M. Dubois, A. Dubois, D. Feng, W. Philp, I. Advanced Network Research and Development Los Alamos National Laboratory P.O. Box 1663 Los AlamosNM87545 United States School of Electrical and Computer Engineering 1285 Electrical Engineering Building Purdue University W. LafayetteIN47907 United States

ISBN: (纸本)076950440X

HiPPI-6400, a high-performance parallel interface running at 6400 Mb/s (800 MB/s), is a networking technology targeted for deployment in a local-area network (LAN) or system-area network (SAN). It is a low-latency, high-bandwidth switch that has the added features of providing flow control and error detection and retransmission in hardware, thus freeing network software from having to implement these functions. Due to the very low overhead of the HiPPI-6400 physical layer and the use of separate control lines, user data rates of HiPPI-6400 are literally 6400 Mb/s or 6.4 Gb/s (eight times the usable bandwidth of Gigabit Ethernet) with an achievable bit-error rate of less than 1025. An initial 32-port HiPPI-6400 prototype, running an OS-bypass network protocol called ST between two 32-node SGI Origin 2000s, produced one-way latencies of 7 μs and sustained data rates of 3.6 Gb/s (unidirectional) and 6.4 Gb/s (bidirectional). The HiPPI-6400 bandwidth in both cases was limited by the memory architecture of the SGI Origin 2000, not by the network. When running an OS-based protocol such as TCP, the unidirectional bandwidth was 2.2 Gb/s. © 1999 IEEE.

关键词： Bandwidth

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A compact lateral-SOI BJT model for RF circuit simulation

A compact lateral-SOI BJT model for RF circuit simulation

引用

International Conference on Simulation of Semiconductor Processes and Devices (SISPAD)

作者： T. Fuse S. Kawanaka K. Inoh T. Shino Computer & Network Laboratory Toshiba Corporation Kawasaki Japan Advanced LSI Technology Laboratory Toshiba Corporation Kawasaki Japan Microelectronics Engineering Laboratory Toshiba Corporation Kawasaki Japan

Lateral bipolar transistors using SOI technology (lateral-SOI BJTs) are promising for low-power RF chips in portable communications equipment, owing to their inherently small parasitics. In high-frequency region above 1 GHz, however, the unique device structure degrades the accuracy of the circuit simulation using the MGP model. This paper describes a compact equivalent circuit model for lateral-SOI BJTs, in which parasitic effects depending on the device structure are taken into account precisely, based on results of 3D device simulation.

关键词： Radio frequency Circuit simulation Capacitors Equivalent circuits Laboratories SPICE Analytical models Admittance Carbon capture and storage Fuses

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A novel high-performance lateral BJT on SOI with metal-backed single-silicon external base for low-power/low-cost RF applications

A novel high-performance lateral BJT on SOI with metal-backe...

引用

Bipolar/BiCMOS Circuits and Technology Meeting

作者： T. Yamada H. Nii K. Inoh T. Shino S. Kawanaka Y. Minami T. Fuse Y. Yoshimi Y. Katsumata S. Watanabe J. Matsunaga H. Ishiuchi Advanced LSI Technology Laboratory Toshiba Corporation Japan Microelectronics Engineering Laboratory Toshiba Corporation Yokohama Japan Computer & Network Systems Laboratory Toshiba Corporation Kawasaki Japan

ISBN: (纸本)0780357132

A novel device structure to realize high-performance SOI lateral BJTs is presented. A metal-backed single-silicon external base electrode and a simple SOI structure achieve low base resistance and low parasitic capacitances, respectively. Due to the minimal parasitics, the device exhibited an fmax of 62 GHz with a low power dissipation per emitter area of 0.55 mW//spl mu/m/sup 2/.

关键词： Laboratories Parasitic capacitance Implants Radio frequency Electrodes Ink Contact resistance Etching Fuses Large scale integration

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Location-dependent other-cell interference and its effect on the uplink capacity of a cellular CDMA system

Location-dependent other-cell interference and its effect on...

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IEEE Conference on Vehicular Technology (VTC)

作者： Zhuyu Lei D.J. Goodman N.B. Mandayam Wireless Information Network Laboratory (WINLAB) Department of Electrical and Computer Engineering Rutgers State University of New Jersey Piscataway NJ USA

We consider the other-cell interference evaluation problem in a multi-cell CDMA system by looking at its location-dependence on the location distributions of mobile users in the cells. The goal is to characterize the location-dependent availability of radio resources in CDMA cellular networks. We model the locations of mobile users in a CDMA cell statistically by assuming certain location probability distributions. The expected interference generated by a mobile user in the cell to a neighbor cell is studied both analytically and numerically. Then the effect of this interference on the uplink capacity of a CDMA cell is investigated. The relevance of this work to traffic admission control is discussed.

关键词： Interference Multiaccess communication Probability distribution Availability Cellular networks Land mobile radio cellular systems Resource management Fading Power control Capacity planning

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An alarm correlation and fault identification scheme based on OSI managed object classes

An alarm correlation and fault identification scheme based o...

引用

IEEE International Conference on Communications (ICC)

作者： Jaesung Choi Myungwhan Choi Sang-Hyuk Lee Department of Computer Science and Engineering Sogang University Seoul South Korea Telecommunications Network Laboratory Korea Telecom Taejon South Korea

Communication networks have increased dramatically in size and complexity. As communication networks become larger and more complex, the need for advanced fault management system has increased. A single fault in a large communication network may result in a large number of fault indications making the isolation of the fault source a difficult task. In this paper, we propose an efficient alarm correlation and fault identification scheme based on OSI managed object classes to isolate the fault source quickly. Our algorithm uses managed object class dependency graphs. These graphs are more practical than other object instance basis graphs in the previous literatures, since the size of them are small and they remain unchanged even after the creation and deletion of real active object instances. It is shown that our algorithm is much simpler to implement.

关键词： Fault diagnosis Open systems Communication networks Testing computer network management Knowledge management engineering management computer science Expert systems Humans

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The design of an open real-time system using CORBA

The design of an open real-time system using CORBA

引用

International Conference on Parallel Processing Workshops (ICPPW)

作者： W. Feng School of Elec. & Computer Engineering Purdue University West Lafayette IN USA Network Engineering CIC-5 Los Alamos National Laboratory Los Alamos NM USA

While CORBA provides an infrastructure which allows objects to communicate, independent of the specific techniques, languages, and platforms used to implement the objects, it is not yet suited for real-time applications since CORBA lacks essential quality-of-service (QoS) features. Current work on real-time CORBA includes an off-line scheduled, hard, real-time system based on rate-monotonic scheduling and an on-line scheduled, best-effort, real-time system based on the earliest-deadline-first algorithm. The former provides QoS guarantees at the expense of run-time scheduling flexibility while the latter provides the complement. We propose an approach which provides the advantages of both, that is, QoS guarantees and run-time scheduling flexibility.

关键词： Real time systems Middleware Runtime Application software Programming Dynamic scheduling Costs Laboratories Intelligent networks Scheduling algorithm

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An efficient multicast delivery scheme to support Mobile IP

An efficient multicast delivery scheme to support Mobile IP

引用

International Workshop on Database and Expert Systems Applications

作者： Chu-Sing Yang Jiing-Ching Yang Kun-Da Wu Jian-Xing Lee yuh-Rong Leu Institute of Computer Information Engineering National Sun Yat-Sen University Taiwan National Sun Yat-sen University Kaohsiung TW Communication Network Laboratory Institute of Information and Industry Taiwan Communication Network Laboratory Institute of Information and Industry

ISBN: (纸本)0769502814

Once mobile nodes move into another network, Mobile IP is employed for the remaining unicast services. However, multicast services become unavailable because of topology changes. A multicast scheme is proposed based on our Domain-based Mobile IP (K.D. Wu et al., 1998). Multicast services are divided into two types: Intra-domain service and Inter-domain service. The article identifies mobile nodes joining the Internet where they can acquire benefits of multicasting and its potential values, as for stationary nodes it does not matter they are at Home network or Foreign network. Finally the comparison of multicast delivery schemes for the mobile environment is presented.

关键词： IP networks Local area networks Home automation

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A non-line-of-sight error mitigation algorithm in location estimation

A non-line-of-sight error mitigation algorithm in location e...

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IEEE Conference on Wireless Communications and networking

作者： Pi-Chun Chen Red Bank Telcordia Technologies Inc. NJ USA Wireless Information Network Laboratory Department of Electrical and Computer Engineering Rutgers University USA

The location estimation of mobile telephones is of great current interest. The two sources of range measurement errors in geolocation techniques are measuring error and non-line-of-sight (NLOS) error. The NLOS errors, derived from the blocking of direct paths, have been considered as a killer issue in the location estimation. In this paper we develop an algorithm to mitigate the NLOS errors in location estimation when the range measurements corrupted by NLOS errors are not identifiable. This algorithm, referred to as the residual weighting algorithm (Rwgh), assumes that the number of range measurements is greater than the minimum number required. The Rwgh algorithm is compared with two other generic algorithms and tested under various scenarios and NLOS error models, which includes deterministic and random NLOS error models. In both cases, Rwgh has shown the effectiveness of NLOS error mitigation in location estimation.

关键词： Testing computer errors Measurement errors Time measurement Transmitters Intelligent networks Laboratories Mobile computing Telephony Estimation error

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Relative convergence of the cascade RLS with subsection adaptation algorithm

Relative convergence of the cascade RLS with subsection adap...

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Asilomar Conference on Signals, Systems & computers

作者： G. Zakaria A.A. Beex The Bradley Department of Electrical and Computer Engineering VIRGINIA TECH Systems Group-DSP Research Laboratory Blacksburg VA USA Hughes Network Systems Germantown MD USA

We analyze the convergence behavior of the CRLS-SA algorithm for inverse filtering. The CRLS-SA is a cascade adaptive filter based on the RLS algorithm, with each section adapted independently based on global minimization. The subsection adaptation results in reduced computational complexity. The rate of convergence is evaluated based on the convergence time constant defined as the ratio of condition number and sensitivity. The smaller the convergence time constant, the faster the structure converges. Analysis and simulation explain and show that CRLS-SA exhibits faster convergence than the direct form RLS adaptive filter for speech type signals.

关键词： Convergence Resonance light scattering Adaptive filters Speech analysis Algorithm design and analysis Filtering algorithms Minimization methods Computational complexity Signal analysis Computational modeling

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