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
Computer system linked by using information in data objects
TL;DR: In this paper, various improvements to steganographic systems, and applications, are disclosed, such as facilitating scale and rotation registration, improving robustness, and representing data by patterned bit cells whose energy in the spatial domain facilitates decoding registration.
Patent
Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels
David M. Van Wie,Robert P. Weber +1 more
TL;DR: In this paper, the authors used steganographic techniques to encode a rights management control signal onto an information signal carried over an insecure communications channel, which can provide end-to-end rights management protection of information signal irrespective of transformations between analog and digital.
Patent
GPS receiver and method for processing GPS signals
TL;DR: A GPS receiver in one embodiment includes an antenna which receives GPS signals at an RF frequency from in view satellites; a downconverter coupled to the antenna for reducing the RF frequency of the received GPS signals to an intermediate frequency (IF); a digitizer coupled to GPS signals and sampling the signals at a predetermined rate to produce sampled IF GPS signals as discussed by the authors.
Patent
Trusted infrastructure support systems, methods and techniques for secure electronic commerce, electronic transactions and rights management
TL;DR: In this article, an integrated, modular array of administrative and support services for electronic commerce and electronic rights and transaction management is provided for electronic networks, which can also be adapted to the specific needs of electronic commerce value chains.
Patent
Method and apparatus for high-rate packet data transmission
Roberto Padovani,Bender Paul E,Peter J. Black,Matthew S. Grob,Hinderling Jurg K,Nagabhushana T. Sindhushayana,Wheatley Charles E +6 more
TL;DR: In this article, the data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packet, which results in retransmission of the received in error.
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.