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Institution

Motorola

CompanySchaumburg, Illinois, United States
About: Motorola is a company organization based out in Schaumburg, Illinois, United States. It is known for research contribution in the topics: Signal & Communications system. The organization has 27298 authors who have published 38274 publications receiving 968710 citations. The organization is also known as: Motorola, Inc. & Galvin Manufacturing Corporation.


Papers
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Patent
29 Apr 1991
TL;DR: In this article, a noise squelch circuit for a radio receiver (100) includes an adaptive filter (204) for shaping frequency characteristics of a demodulator out put (115) according to factors which effects squelches sensitivity.
Abstract: A noise squelch circuit for a radio receiver (100) includes an adaptive filter (204) for shaping frequency characteristics of a demodulator out put (115) according to factors which effects squelch sensitivity. Such factors may include channel spacing of the receiver, received signal strength level, received signal deviation, and SINAD. The adaptive filter (204) comprises a switched capacitor filter, the response of which may be controlled by a control signal (212) according to one or more of such factors.

169 citations

Proceedings ArticleDOI
15 Apr 2008
TL;DR: A new analytical model is proposed to evaluate the statistical performance of the energy detection and it is shown how it can be used to set the appropriate threshold such that more spectrum sharing can be facilitated, especially when combined with cooperative spectrum sensing method.
Abstract: In this paper, we analyze the performance of spectrum sensing based on energy detection. We do not assume the exact noise variance is known a priori. Instead, an estimated noise variance is used to calculate the threshold used in the spectrum sensing based on energy detection. We propose a new analytical model to evaluate the statistical performance of the energy detection. We claim some characteristics of this model, and analyze how these characteristics affect the performance of spectrum sensing. The analytical results are verified through numerical examples and simulations. Through these examples, we demonstrate the effectiveness of our analytical model: we show how it can be used to set the appropriate threshold such that more spectrum sharing can be facilitated, especially when combined with cooperative spectrum sensing method.

169 citations

Journal ArticleDOI
TL;DR: In this paper, the diffusion of protons has been studied in fully hydrated Nafion® with a recently constructed non-equilibrium statistical mechanical transport model, which revealed that the effective friction coefficient increases by more than two orders of magnitude as the proton is brought from the center of the pore to within 4 A of the fixed sites.
Abstract: The diffusion of protons has been studied in fully hydrated Nafion® with a recently constructed non-equilibrium statistical mechanical transport model. Radial cross-sectional profiles of the effective friction and diffusion coefficients were computed in an electrolyte membrane pore with a hydration of 22.5 water molecules per sulfonic acid fixed site. Input parameters were taken from recent SAXS measurements of the hydrated membrane and electronic structure calculations of water clusters with CF3SO3H, the associated acid for the side chain termination. The calculations revealed that the effective friction coefficient increases by more than two orders of magnitude as the proton is brought from the center of the pore to within 4 A of the fixed sites. The model calculated a diffusion coefficient of 1.92 × 10−9 m2 s−1, without ‘fitting’ any parameters, for a proton moving along the pore center, in good agreement with experimental measurements. In addition, the model also identified a predominantly vehicular transport mechanism in regions of the cross section of the pore where the proton is within 12 A of the pore wall. This was distinguished from the central region of the pore (within 4 A of the center axis) where a component of the conduction is via the Grotthuss mechanism. This investigation has demonstrated the applicability of this transport model in the prediction of diffusion coefficients in fully hydrated membranes.

169 citations

Patent
James Blake Bullock1
26 Feb 2001
TL;DR: In this paper, a traffic flow algorithm is coupled with a set of unsolicited user-defined navigation route data (UDN) for traffic content optimization between a starting location ( 305, 405 ) and destination location ( 310, 410 ).
Abstract: A method of optimizing traffic content includes providing a traffic flow algorithm ( 220 ) coupled to receive a set of solicited navigation route data ( 210 ) and a set of solicited traffic data ( 212 ) between a starting location ( 305, 405 ) and a destination location ( 310, 410 ), where traffic flow algorithm ( 220 ) is designed to compute a set of optimized traffic content ( 230 ) between a starting location ( 305, 405 ) and a destination location ( 310, 410 ). A set of unsolicited user-defined navigation route data ( 215 ) is received and incorporated with set of solicited navigation route data ( 210 ) and set of solicited traffic data ( 212 ) into traffic flow algorithm ( 220 ). A set of optimized traffic content ( 230 ) is calculated between the starting location ( 305, 405 ) and the destination location ( 310, 410 ) utilizing at least the set of unsolicited user-defined navigation route data ( 215 ).

168 citations

Patent
20 Oct 1997
TL;DR: In this article, a method for chemical mechanical polishing (CMP) a copper layer (22) begins by forming the copper layer and is then exposed to a slurry (24), which contains an oxidizing agent such as H 2 O 2, a carboxylate salt such as ammonium citrate, an abrasive slurry such as alumna abrasive, an optional triazole or triazoles derivative, and a remaining balance of a solvent such as deionized water.
Abstract: A method for chemical mechanical polishing (CMP) a copper layer (22) begins by forming the copper layer (22). The copper layer (22) is then exposed to a slurry (24). The slurry (24) contains an oxidizing agent such as H 2 O 2 , a carboxylate salt such as ammonium citrate, an abrasive slurry such as alumna abrasive, an optional triazole or triazole derivative, and a remaining balance of a solvent such as deionized water. The use of the slurry (24) polishes the copper layer (22) with a high rate of removal whereby pitting and corrosion of the copper layer (22) is reduced and good copper interconnect planarity is achieved. This slurry (24) has good selectivity of copper to oxide, and results in copper devices which have good electrical performance. In addition, disposal of the slurry (24) is not environmentally difficult since the slurry (24) is environmentally sound when compared to other prior art slurries.

168 citations


Authors

Showing all 27298 results

NameH-indexPapersCitations
Georgios B. Giannakis137132173517
Yonggang Huang13679769290
Chenming Hu119129657264
Theodore S. Rappaport11249068853
Chang Ming Li9789642888
John Kim9040641986
James W. Hicks8940651636
David Blaauw8775029855
Mark Harman8350629118
Philippe Renaud7777326868
Aggelos K. Katsaggelos7694626196
Min Zhao7154724549
Weidong Shi7052816368
David Pearce7034225680
Douglas L. Jones7051221596
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20232
20229
202129
2020131
2019134
2018144