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Results 1 - 10
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1,311
Pilot Assisted Wireless Transmissions
- IEEE Signal Processing Mag
, 2004
"... The design of pilot assisted wireless transmissions is considered from signal processing and information theoretical perspectives. A general pilot placement model is presented and related figures of merit discussed. A survey of recent pilot assisted transmission theory and techniques is provided. ..."
Abstract
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Cited by 63 (2 self)
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The design of pilot assisted wireless transmissions is considered from signal processing and information theoretical perspectives. A general pilot placement model is presented and related figures of merit discussed. A survey of recent pilot assisted transmission theory and techniques is provided.
The Impact of Data Aggregation in Wireless Sensor Networks
"... Sensor networks are distributed event-based systems that differ from traditional communication networks in several ways: sensor networks have severe energy constraints, redundant low-rate data, and many-to-one flows. Datacentric mechanisms that perform in-network aggregation of data are needed in th ..."
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Cited by 400 (12 self)
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in this setting for energy-efficient information flow. In this paper we model data-centric routing and compare its performance with traditional end-toend routing schemes. We examine the impact of sourcedestination placement and communication network density on the energy costs and delay associated with data
Near-optimal sensor placements: Maximizing information while minimizing communication cost
- In IPSN
, 2006
"... When monitoring spatial phenomena with wireless sensor networks, selecting the best sensor placements is a fundamental task. Not only should the sensors be informative, but they should also be able to communicate efficiently. In this paper, we present a data-driven approach that addresses the three ..."
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Cited by 152 (19 self)
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the NP-hard tradeoff. Specifically, we use data from a pilot deployment to build non-parametric probabilistic models called Gaussian Processes (GPs) both for the spatial phenomena of interest and for the spatial variability of link qualities, which allows us to estimate predictive power and communication
Linear Controller Design: Limits of Performance Via Convex Optimization
, 1990
"... this paper, we first give a very brief overview of control engineering. The goal of control engineering is to improve, or in some cases ena- ble, the performance of a system by the addition of sensors, which measure various signals in the system and external command signals, control processors, whic ..."
Abstract
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Cited by 202 (25 self)
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, Stanford University, Stanford, CA 94305, USA. IEEE Log Number 8933936. system to various excitations, a procedure known as s)zstem identification [3]. In some cases, several models are developed, varying in complexity and accu racy. 2. Control configuration: selection and placement of sensors an...
Corrective feedback and learner uptake: Negotiation of form in communicative classroom.
- Studies in Second Language Acquisition,
, 1997
"... This article presents a study of corrective feedback and learner uptake (i.e., responses to feedback) in four immersion classrooms at the primary level. Transcripts totaling 18.3 hours of classroom interaction taken from 14 subject-matter lessons and 13 French language arts lessons were analyzed us ..."
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Cited by 173 (6 self)
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using a model developed for the study and comprising the various moves in an error treatment sequence. Results include the frequency and distribution of the six different feedback types used by the four teachers, in addition to the frequency and distribution of different types of learner uptake
Pilot Placement for Time-Varying MIMO OFDM Channels with Virtual Subcarriers
, 2010
"... The rapid time-variation of a fading multipath environment can impair the performance of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO OFDM). This paper proposes a pilot placement method for MIMO OFDM systems under time-varying channels with the guard band. The time ..."
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The rapid time-variation of a fading multipath environment can impair the performance of multiple-input multiple-output orthogonal frequency division multiplexing (MIMO OFDM). This paper proposes a pilot placement method for MIMO OFDM systems under time-varying channels with the guard band
Approximation Algorithms for Data Placement in Arbitrary Networks
, 2001
"... We study approximation algorithms for placing replicated data in arbitrary networks. Consider a network of nodes with individual storage capacities and a metric communication cost function, in which each node periodically issues a request for an object drawn from a collection of uniform-length objec ..."
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Cited by 84 (4 self)
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relaxation of the problem. We also show that the data placement problem is MAXSNP-hard. We extend our approximation result to a generalization of the data placement problem that models additional costs such as the cost of realizing the placement. We also show that when object lengths are non-uniform, a
On the Pilot Carrier Placement in Multicarrier-Based Systems
, 2014
"... In traditional multicarrier systems, the pilot carriers used to estimate the channel are placed as uniform as possible over the bandwidth. However, with the raise of cognitive radio systems, where themulticarrier system is used by the secondary users, parts of the bandwidth are not available for tr ..."
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-spaced distribution of the pilot carriers is in general not the op-timal placement of the pilot carriers, as the corresponding MSE can become very high. In this paper, we use a heuristic algorithm to search for the best pilot placement, which is able to deliver a pilot carrier placement that outperforms the maximum
The GuideLine Interchange Format: A Model for Representing Guidelines
- Journal of the American Medical Informatics Association
, 1998
"... The GuideLine Interchange Format (GLIF) is a model for representing guidelines in a machinereadable format. GLIF was developed by researchers from the InterMed Collaboratory at Co- lumbia University, Harvard University (Brigham and Women's Hospital and Massachusetts General Hospital), and Stanf ..."
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Cited by 120 (2 self)
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The GuideLine Interchange Format (GLIF) is a model for representing guidelines in a machinereadable format. GLIF was developed by researchers from the InterMed Collaboratory at Co- lumbia University, Harvard University (Brigham and Women's Hospital and Massachusetts General Hospital
Behavior of Congestion Minimization During Placement".
- In International Symposium on Physical Design,
, 1999
"... ABSTRACT Typical placement objectives involve reducing net-cut cost or minimizing wirelength. Congestion minimization is least understood, however, it models routability accurately. In this paper, we study the congestion minimization problem during placement. We introduce the notion of consistent r ..."
Abstract
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Cited by 60 (11 self)
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routing model and promote its adoption by placement systems. First, we show that in this model the wirelength objective is indeed a good measure of congestion by establishing that a placement with minimum wirelength has minimum total congestion. We show that minimizing wirelength may and in general
Results 1 - 10
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1,311
