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
Quadriphase spreading codes in code division multiple access communications
TL;DR: In this article, a family of quadriphase spreading codes is employed to achieve a high capacity in the CDMA communications system while at the same time having a minimal peak cross-correlation between any two spreading codes within that family to ensure crosscorrelation interference is kept at or below acceptable levels.
Patent
Determining a spatial signature using a robust calibration signal
TL;DR: In this paper, the authors proposed a method to determine the partial spatial signature using a first segment of a waveform, the first segment resulting from a radio transmitting a combined signal from a first antenna element, the combined signal comprising the sum of a first signal and a second signal, and calculating a first spatial signature related measurement using the received first segment, the second segment, and the second signal.
Patent
Bearer channel modification system for a code division multiple access (CDMA) communication system
Gary R. Lomp,John Kowalski,Fatih M. Ozluturk,Avi Silverberg,Robert Regis,Michael Luddy,Alexander Marra,Alexander Jacques +7 more
TL;DR: In this article, the authors describe a multipleach, spread-special-transmission (SST) communication system, which is composed of multiple CDMA MODEMS, one of which provides a global pilot code signal.
Patent
Method and apparatus for controlling wireless network access privileges based on wireless client location
TL;DR: In this article, the location of a wireless device is determined by a location determination system using the signal strength of the device signal, and the location information and ID information are provided to an access server that uses the criteria set to retrieve access privileges from a privilege database.
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Method and apparatus for paging a concentrated subscriber system for wireless local loop
Barry R. Robbins,Noam A. Ziv +1 more
TL;DR: In this paper, a method and apparatus for paging a concentrated subscriber system for wireless local loop within a cellular telephone system is described, where the paging code is calculated in various manners depending on the resulting CSS status information of the subscriber unit being paged.
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.