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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Watermark embedder and reader
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Patent
Spread spectrum demodulator
Robert S. Gordy,David E. Sanders +1 more
TL;DR: In this paper, a correlator phase shifts the modulated carrier signal as a function of a locally generated PN (pseudo-noise) sequence to provide a narrow band two-phase PSK modulated signal.
Patent
Protocol and transceiver for cordless/cellular telephone service
TL;DR: In this article, a hand portable radio telephones operating in a cellular mode, the typical cell size being between 500 m and 3 km radius, each cell comprising at least one primary or base station (10) connected to the PSTN and one or more secondary portable stations (14) which are capable of roaming within the cell.
Patent
Spread spectrum code-division-multiple-access (ss- cdma) lightwave communication system
TL;DR: In this article, a light-wave communication system, and associated transmitters and receivers, which uses both spread spectrum, code-division-multiple access (SS-CDMA), and wavelength-division multiplexing (WDM) techniques for 2-way transmissions over a lightwave waveguide arrangement, is described.
Patent
Spread spectrum communications method and apparatus
Aaron Weinberg,Paul M. Ebert,Joseph J. Fee,Yaroslav Kaminsky,Feisal S. Keblawi,Walter C. Scales +5 more
TL;DR: In this paper, a method and apparatus employing spread spectrum techniques in a wide bandwidth communications system is disclosed, where a plurality of transmitting stations are each equipped to provide a transmission signal representing a pseudo-random coded, phase modulated, message signal.
Patent
Real-time adaptive power control in satellite communications systems
TL;DR: An adaptive transmitter power control for use in satellite communications systems was proposed in this article, where at least two ground stations communicate serial streams of binary data via a satellite transponder whose power-output is functionally dependent upon received signal strength.