Institution
Motorola
Company•Schaumburg, 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 published on a yearly basis
Papers
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20 Oct 2000TL;DR: In this paper, the transceiver determines what portion of the spectrum is desired for data transmission and then transmits (see time slots 11 and 13) the data transmission within a dynamically selected portion of available spectrum.
Abstract: A transceiver device (52 or 10) operates as a source of a data transmission in a communication system (50) capable of dynamically allocating spectrum for transmission of the data transmission between the transceiver device (52) and a second transceiver device (51). The transceiver device (10) includes a transmitter, a receiver coupled to the transmitter and a processor or controller (12) coupled to the transmitter and receiver. The transceiver device is programmed to monitor the spectrum (channels 1-13 of FIG. 3) to determine if a portion (channels 4-8 for example in time slot 8) of the spectrum is available. The transceiver determines what portion of the spectrum is desired for data transmission and then transmits (see time slots 11 and 13) the data transmission within a dynamically selected portion of the available spectrum.
140 citations
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04 Dec 1989TL;DR: In this paper, the identification system of an on-site communication system includes a system for identifying communication receivers including acknowledge back capability and operating within the ON-SIT system, and for controlling the delivery of messages to the communication receivers.
Abstract: An on-site communication system includes a system for identifying communication receivers including acknowledge back capability and operating within the on-site communication system, and for controlling the delivery of messages to the communication receivers. The identification system operates on the same frequency as the on-site communication system, and includes an RF shielded enclosure for momentarily shielding the communication receivers from messsages transmitted on the on-site communication system. The RF shielded enclosure provides interference free identification of the communication receivers as the communication receivers pass through the enclosure, and enables the determination of those communication receivers which are operating within the coverage area of the on-site communication system, and those communication receivers which have left the coverage area of the on-site communication system.
140 citations
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23 Jun 1995TL;DR: In this article, the authors proposed a split key encryption system, which allows portable, encrypted data to be accessible through multiple hosts, including new hosts (14), without requiring a secure link to the new hosts.
Abstract: A system and method allows portable, encrypted data to be accessible through multiple hosts, including new hosts (14), without requiring a secure link to the new hosts. A split key encryption system encrypts (52) data and stores the encrypted data on a portable device (10). A split of the encryption key is stored (54) in the portable device (10), and another split of the key is stored (54) in a home host (12) . A password-modified key is then made (58) by combining a password with the encryption key. This password-modified key is then reduced (58), with one split being stored on the host (12) and another split stored on the portable device (10) . Data can be accessed with a new host (14) by transferring (78) the host password-modified split to the new host (14) and entering (80) the password into the portable device (10).
140 citations
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TL;DR: In this paper, electron diffraction was used to determine chiral vectors of single-wall carbon nanotubes (SWNTs) using a parallel electron beam over a section of tube of ∼50 nm long.
Abstract: In this letter, we report an electron diffraction determination of chiral vectors (n,m) of individual single-wall carbon nanotubes (SWNTs). Electron diffraction patterns from individual SWNTs were recorded on imaging plates using a parallel electron beam over a section of tube of ∼50 nm long. Using two tubes of 1.39 and 3.77 nm in diameter, we show that the details of electron diffuse scattering can be detected for both the small and large tubes. The quality of diffraction patterns allows the accurate measurement of both the diameters and chiral angles of SWNTs for a direct determination of chiral vectors. The electron diffraction technique is general and applicable to other forms of individual nanostructures.
140 citations
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28 Jan 1999TL;DR: In this paper, the authors present a communications system (100) that is capable of adapting to an unknown or varying spectral environment in a channel (14) between two communications units (12, 16).
Abstract: The present invention relates to a communications system (100) that is capable of adapting to an unknown or varying spectral environment in a channel (14) between two communications units (12, 16). The system (100) maintains a spectral profile of the channel (14) and uses the spectral profile to determine appropriate transmit parameters for the system (100). The system (100) can be programmed to provide an optimal transmit signal for achieving a predetermined performance goal (such as, for example, maximum data rate at a given bit error rate (BER)) in light of the spectral environment in the channel (14). In one embodiment, the spectral profile is maintained in a spectrum table memory (27) that is periodically (or continuously) updated.
140 citations
Authors
Showing all 27298 results
Name | H-index | Papers | Citations |
---|---|---|---|
Georgios B. Giannakis | 137 | 1321 | 73517 |
Yonggang Huang | 136 | 797 | 69290 |
Chenming Hu | 119 | 1296 | 57264 |
Theodore S. Rappaport | 112 | 490 | 68853 |
Chang Ming Li | 97 | 896 | 42888 |
John Kim | 90 | 406 | 41986 |
James W. Hicks | 89 | 406 | 51636 |
David Blaauw | 87 | 750 | 29855 |
Mark Harman | 83 | 506 | 29118 |
Philippe Renaud | 77 | 773 | 26868 |
Aggelos K. Katsaggelos | 76 | 946 | 26196 |
Min Zhao | 71 | 547 | 24549 |
Weidong Shi | 70 | 528 | 16368 |
David Pearce | 70 | 342 | 25680 |
Douglas L. Jones | 70 | 512 | 21596 |