Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 27 - Modulated-carrier systems
Patents for H04L 27 - Modulated-carrier systems (89,721)
09/1990
09/28/1990CA2012687A1 Method and device for reducing noise in a multiple preset levels codable signal
09/25/1990US4959844 Clock recovery circuit for digital demodulator
09/25/1990US4959842 For communicating data over a channel
09/25/1990US4959827 Laser signal mixer circuit
09/25/1990US4959619 Digital transmission demodulator including an automatic fault corrector
09/25/1990CA1274630A2 Subscriber unit for wireless digital telephone system
09/20/1990WO1990010986A1 Wave form generator
09/20/1990WO1990010985A1 Continuous phase shift modulation system with improved spectrum control
09/19/1990EP0388381A1 Wave-form generator
09/19/1990EP0387948A1 Adaptive predistortion circuit with memory
09/19/1990EP0387839A2 MSK signal detector
09/19/1990EP0387245A1 Digital dqpsk decoder circuit element
09/18/1990US4958360 Circuit for recovering the carrier in digital transmission systems
09/14/1990CA2011837A1 Adaptive predistortion circuit with a memory
09/12/1990EP0386412A1 GMSK modulator
09/12/1990EP0386029A1 Demodulation method.
09/12/1990CN1045320A Method and apparatus for preprocessing and demodulating m-ary phase shift keyed (psk) signals
09/12/1990CN1045318A Local area network communication system
09/12/1990CN1009610B Home unit for wireless digital telephone system
09/11/1990WO1990010975A1 Data signal discrimination method and apparatus
09/11/1990US4956853 Method of servo-controlling the instant of regeneration in a digital transmission in which a carrier is modulated along two axes in quadrature, and apparatus for implementing the method
09/11/1990CA2047753A1 Data signal discrimination method and apparatus
09/11/1990CA1274003A1 Carrier recovery circuitry immune to interburst frequency variations
09/07/1990CA2011592A1 Multiple phase psk demodulator
09/05/1990EP0385695A2 Communication system
09/05/1990EP0385694A2 Method and apparatus for demodulating M-ary phase shift keyed (PSK) signals
09/05/1990EP0385074A1 Method for demodulating MSK signals
09/05/1990EP0204745B1 Data modem system
09/04/1990CA1273680A1 Circuit for extracting carrier signals
08/1990
08/31/1990CA2009713A1 Local area network communication system
08/31/1990CA2009712A1 Method and apparatus for preprocessing and demodulating m-ary phase shift keyed (psk) signals
08/28/1990US4953210 Feature negotiation protocol for a synchronous modem
08/23/1990DE3940531A1 Information encoding into PWM half-period sequence
08/23/1990DE3904900A1 Method for the digital and/or analog coding of information of one, two or more channels and/or frequency or bandwidth reduction and/or increase in transmission reliability
08/22/1990EP0383711A1 Modem with a secure alternative mode, particularly for a switched telephone network
08/22/1990EP0383632A2 Mapping digital data sequences
08/22/1990EP0383349A2 A method of arranging signal points in a quadrature amplitude modulation/demodulation system
08/22/1990EP0383326A2 Fir digital filter for high-speed communications systems
08/21/1990CA1273069A1 Validity decision circuit capable of correctly deciding validity of an error signal in a multilevel quadrature amplitude demodulator
08/17/1990CA2010109A1 Method of arranging signal points in a quadrature amplitude modulation/demodulation system
08/16/1990EP0382697A2 Control voltage generator in a transmitter arrangement for digitally modulated signals
08/16/1990EP0382695A2 Transmitter arrangement for digitally modulated signals
08/14/1990US4949357 Synchronizing circuit for offset quaternary phase shift keying
08/14/1990US4949356 PCM receiver with lock state control
08/14/1990CA1272817A2 Subscriber unit for wireless digital telephone system
08/14/1990CA1272786A1 System for identifying particular objects
08/09/1990WO1990009070A1 A method of controlling the frequency of a coherent radio receiver and apparatus for carrying out the method
08/09/1990WO1990009069A1 A method of rapidly controlling the frequency of a coherent radio receiver and apparatus for carrying out the method
08/09/1990DE3903394A1 Arrangement for DC voltage stabilisation of a device for receiving signals
08/08/1990EP0381637A1 A method of controlling the frequency of a coherent radio receiver and apparatus for carrying out the method
08/08/1990EP0381636A1 A method of rapidly controlling the frequency of a coherent radio receiver and apparatus for carrying out the method
08/08/1990EP0380876A2 Phase synchronous maximum likelihood decoder
08/08/1990CN1044561A Method of controlling frequency of coherent radio receiver and apparatus for carrying out method
08/08/1990CN1044560A Method of rapidly controlling frequency of coherent radio receiver and apparatus for carrying out method
08/07/1990US4947453 Transparent tone-in band transmitters, receivers and systems
08/07/1990US4947409 Apparatus for correcting frequency in a coherent receiver
08/07/1990US4947407 Sample-and-hold digital phase-locked loop for ask signals
08/02/1990DE3902795A1 Method for recovering the data bits from frequency-shift-keyed signals for data transmission
08/01/1990EP0380167A1 Adaptive predistortion circuit
08/01/1990EP0379706A1 Non-intrusive device for diagnosing a transmission channel for a digital modem applied to a demodulator-regenerator
07/1990
07/31/1990US4945549 Trellis coded modulation for transmission over fading mobile satellite channel
07/31/1990US4945312 Method and device for the demodulation of signals with constant envelope and continuous phase angle modulation by a train of binary symbols tolerating frequency drifts
07/31/1990US4944299 High speed digital telemetry system for implantable device
07/31/1990CA1272317A1 Subscriber unit for wireless digital telephone system
07/31/1990CA1272316B Subscriber unit for wireless digital telephone system
07/26/1990WO1990004297A3 Local area network modem
07/25/1990EP0379114A1 Method and apparatus for the control of the parameters of a modulator with 2n phase/amplitude states
07/25/1990EP0379113A1 Carrier recovery device insensitive to false lockings
07/25/1990EP0378719A1 Digital distortion generator
07/25/1990EP0378639A1 An arrangement for wireless transmission of signals received via a serial two-conductor data bus.
07/25/1990EP0378546A1 Data carrying devices
07/25/1990CN1008962B Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
07/24/1990US4943983 Subscriber unit for wireless digital telephone system
07/24/1990US4943982 Baseband carrier phase corrector
07/24/1990US4943980 For transmitting digital data information over a telephone channel
07/24/1990CA2008131A1 Adaptive predistortion circuit
07/24/1990CA1271989A1 Automatic drift control circuit
07/18/1990EP0378405A2 Method and apparatus for measuring phase accuracy and amplitude profile of a continuous-phase-modulation signal
07/18/1990EP0378037A1 Modem having a software-adapted modulation rate
07/18/1990EP0377687A1 Spectrally efficient method for communicating an information signal
07/18/1990EP0211865B1 Supervisory tone detection
07/17/1990US4942592 Synchronous receiver for minimum shift keying transmission
07/17/1990US4942591 Multiple phase PSK demodulator
07/12/1990WO1990004895A3 Information coding process
07/11/1990EP0377519A2 Modulation system capable of accurately compensating for nonlinearities of an amplifier connected thereto
07/11/1990EP0377180A2 All-digital quadrature modulator
07/10/1990US4941199 Uplink power control mechanism for maintaining constant output power from satellite transponder
07/10/1990US4941155 Method and circuitry for symbol timing and frequency offset estimation in time division multiple access radio systems
07/10/1990US4941154 Trellis coding method and arrangement for fractional bit rates
07/10/1990US4940954 Unbalanced quadrature PSK modulator-limiter
07/10/1990US4940951 Phase lock recovery apparatus for phase locked loop circuit
07/10/1990CA1271529A1 Digitally implemented modulators
07/04/1990EP0376397A1 Device for transmitting information using a frequency modulation
07/03/1990US4939790 PLL frequency stabilization in data packet receivers
07/03/1990US4939734 Method and a system for coding and decoding data for transmission
07/03/1990US4939555 Trellis coding arrangement
07/03/1990CA1271236A1 Multi-stage transmitter aerial coupling device
06/1990
06/28/1990WO1990007243A1 Automatic frequency control in the presence of data
06/28/1990DE3843131A1 Method and arrangement for generating two different tone frequencies for AFSK modulation
06/27/1990EP0375497A1 Device for the direct modulation or demodulation of ultra-high frequencies
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