Patent
System and method for generating signal waveforms in a CDMA cellular telephone system
Klein S. Gilhousen,Irwin M. Jacobs,Roberto Padovani,Lindsay A. Weaver,Wheatley Charles E,Andrew J. Viterbi +5 more
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TLDR
In this paper, a system and method for communicating information signals using spread spectrum communication techniques is presented, where PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance.Abstract:
A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols. In the mobile-to-cell link, access and voice channels are defined. Information communicated on the mobile-to-cell link channels are, in general, encoded, interleaved, orthogonal signaling along with QPSK spreading.read more
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Patent
Tamper evident adhesive and identification document including same
TL;DR: In this paper, a composition for adhering a first article to a second article, the composition comprising a thermally active low Tg polymeric resin; and a multifunctional crystalline polymer, was provided.
Patent
Systems and method for orthogonal frequency divisional multiplexing
Mark J. Dapper,Michael J. Geile,Terrance J. Hill,Harold A. Roberts,Brian D. Anderson,Jeffrey Brede,Mark S. Wadman,Robert J. Kirscht,James J. Herrmann,Michael J. Fort,Steven P. Buska,Jeff Solum,Debra Lea Enfield,Darrell Berg,Thomas Smigelski,Thomas C. Tucker,Joe Hall,John M. Logajan,Somvay Boualouang,Heng Lou,Mark D. Elpers,Matt Downs,Tammy Ferris,Adam Opoczynski,David S. Russell,Calvin G. Nelson,Niranjan R. Samant,Joseph F. Chiappetta,Scott Sarnikowski +28 more
TL;DR: In this article, a multi-carrier orthogonal frequency division multiplexing (OFDM) system is presented, where a receiver is configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output, and a transmitter is modulated to modulate symbols onto at least a fraction of the overlapping signals to determine when a collision has occurred on the first carrier.
Patent
Non-intrusive, thread-selective, debugging method and system for a multi-thread digital signal processor
Lucian Codrescu,William C. Anderson,Suresh K. Venkumahanti,Louis Achille Giannini,Manojkumar Pyla,Xufeng Chen +5 more
TL;DR: In this article, the use of breakpoint instructions for generating debugging event(s) in a multi-threaded process is discussed. But the debugging event occurs in response to the execution of breakpoints and executes debugging instructions.
Patent
Forward-link scheduling in a wireless communication system
Jack M. Holtzman,Gang Bao +1 more
TL;DR: In this paper, a favored transmission slot for communicating non-voice data in conjunction with a voice-data communication is selected based upon the transmission power levels for voice data transmitted by a base station to a remote station on a fundamental channel.
Patent
Method and apparatus for providing a cone of silence in a cellular communication system
TL;DR: In this paper, the authors defined an area in which communication between a set of the base stations and the remote unit (125) is forbidden, and an auxiliary antenna (130) transmits a silent region identifying pilot signal.
References
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Book
Advanced Engineering Mathematics
TL;DR: This book discusses ODEs, Partial Differential Equations, Fourier Series, Integrals, and Transforms, and Numerics for ODE's and PDE's, as well as numerical analysis and potential theory, and more.
Patent
Spread spectrum multiple access communication using satellite or terrestrial repeaters
TL;DR: In this article, a multiple access, spread spectrum communication system and method for providing high capacity communications to, from, or between a plurality of system users, using code-division-spread-spectrum communication signals is presented.
Journal ArticleDOI
Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission
TL;DR: A class of nonlinear estimation algorithms is described to estimate the unknown phase of a carrier which is fully modulated by m -ary PSK modulation, and the effect of quantization and finite read-only-memory implementation of the nonlinearity are determined by computer simulation.