H04L 27 - Modulated-carrier systems

Patents for H04L 27 - Modulated-carrier systems (89,721)
12/1986
12/16/1986	US4630288 Data transmission with block coding
12/16/1986	US4630287 Secondary channel signalling in a QAM data point constellation
12/16/1986	US4630286 Device for synchronization of multiple telephone circuits
12/16/1986	CA1215482A1 Simultaneous transmission of speech and data over an analog channel
12/10/1986	EP0204464A2 Clock synchronizing circuit including a voltage controlled oscillator
12/10/1986	EP0204463A2 A QPSK modulator using carrier subharmonic pump signals
12/10/1986	EP0204420A2 Apparatus for performing a fast fourier transform
12/10/1986	EP0204308A2 Modem communication system having training means and method for training same
12/10/1986	EP0204155A1 Modem with power-off ring detection
12/10/1986	EP0203943A1 Method and circuit for detecting the information contained in a received signal.
12/09/1986	US4628518 Radio receiver
12/09/1986	US4628517 Digital radio system
12/09/1986	US4628507 Bit error detection circuit for PSK-modulated carrier wave
12/09/1986	US4628286 Digital frequency modulator
12/09/1986	US4628271 Differential phase shift keying demodulator
12/09/1986	CA1215127A1 Receiver for multicarrier signals protected from unwanted signals
12/09/1986	CA1215120A1 Optical heterodyne detection pulse receiving system and method
12/04/1986	WO1986007223A1 Ensemble modem structure for imperfect transmission media
12/03/1986	CN86103321A Apparatus for performing a fast fourier transform
12/03/1986	CN85202449U Minimum frequency shift keying modulator
12/02/1986	US4627079 Method and apparatus for acquiring and tracking a communications signal
12/02/1986	US4627078 Data communication system
12/02/1986	US4627077 Modified QAM data point constellation for secondary channel signalling
12/02/1986	US4627072 Equalizer modifying a phase of a gain control signal to carry out equalization
12/02/1986	US4626914 Carrier synchronizing system for locking a remotely located carrier generator to a reference carrier generator at a base station
12/02/1986	US4626911 Digital data recovery circuit
12/02/1986	US4626803 Apparatus for providing a carrier signal with two digital data streams I-Q modulated thereon
12/02/1986	US4626790 Demodulator for amplitude-modulated carrier frequency oscillations
12/02/1986	US4626789 Demodulating circuit for data signal
12/02/1986	CA1214834A1 Demodulator with agc circuit for multi-level quadrature amplitude-modulated carrier wave
12/02/1986	CA1214833A1 Phase demodulator
11/1986
11/26/1986	EP0202708A2 D.C. block capacitor circuit
11/26/1986	CN86103406A Ensemble modem structure for imperfect transmission media
11/25/1986	US4625318 Frequency modulated message transmission
11/20/1986	EP0201977A2 Antenna diversity reception arrangement for eliminating reception disturbances
11/19/1986	CN85103657A Equipment for producing angular modolation carrier signals of constant amplitude in respouse to data signals
11/18/1986	CA1214277A1 Method for the transmission of information, in which the signals are coded by way of the magnitude of the amplitudes of the half-waves or periods of a sinus- wave alternating current
11/18/1986	CA1214227A1 Coherent phase shift keyed demodulator for power line communication systems
11/12/1986	EP0201061A2 Receiver for amplitude-modulated time signals
11/11/1986	US4622683 Fast acquisition ringing filter MSK demodulator
11/11/1986	US4622681 Apparatus for transmitting digital data
11/11/1986	US4622670 Error-correction coding for multilevel transmission system
11/11/1986	US4622481 Digital envelope detection circuit
11/06/1986	WO1986006568A1 Reversible energy spreading data transmission technique
11/05/1986	EP0200505A2 Apparatus for transmitting streams of information bits and methods for estimating the most likely sequence sent
11/05/1986	EP0200271A1 Carrier recovery circuit for digital transmission systems
11/05/1986	EP0131054B1 Circuit for reducing errors in a data receiver
11/04/1986	US4621366 Modem equalizer training using previously stored parameters
11/04/1986	US4621355 Method of synchronizing parallel channels of orthogonally multiplexed parallel data transmission system and improved automatic equalizer for use in such a transmission system
11/04/1986	CA1213649A1 Secondary channel method and apparatus
11/04/1986	CA1213646A1 Microwave reception chain comprising a device for direct microwave demodulation
10/1986
10/29/1986	EP0199389A2 SSB pulse modulator
10/29/1986	EP0131055B1 Automatic gain control circuit
10/28/1986	US4620294 Digital signal processor modem
10/28/1986	US4620160 Digital demodulator for continuously phase or frequency modulated signals
10/28/1986	US4620159 Demodulator for multiphase PSK or multilevel QAM signals
10/22/1986	EP0198701A2 Phase detection circuit
10/21/1986	US4618999 Polar loop transmitter
10/21/1986	US4618981 Tone detector with pseudo phase locked loop
10/21/1986	US4618967 Radio receiver
10/21/1986	US4618966 Frequency shift key modulator
10/21/1986	US4618830 PSK demodulator using asynchronous local oscillator
10/15/1986	EP0197708A2 Digital zero IF circuit
10/15/1986	EP0197541A2 System for controlling operation mode of modulator/demodulator
10/15/1986	EP0197529A2 Method for the analogous or digital coding of information for use in angle and pulse modulation processes
10/15/1986	CN86100949A Subscriber rf telephone system for providing multiple speech and/or data signals simultaneously over either a single or a plurality of rf channels
10/14/1986	US4617678 Apparatus for detecting and recovering binary data from an input signal
10/14/1986	US4617656 Information transmission system with modems coupled to a common communication medium
10/14/1986	US4617537 Method for digital quadrature amplitude modulation
10/14/1986	US4617535 PSK digital echo modulator with reduced memory capacity required
10/14/1986	CA1212723A1 System for transmitting digital information signals
10/08/1986	CN85103006A Magnetism sensitive device for measuring two-dimension magnetic vector
10/07/1986	US4616364 Digital hopped frequency, time diversity system
10/07/1986	US4616187 Frequency shift keying signal for a demodulator
10/07/1986	CA1212437A1 Data transmission system with error correcting data encoding
10/07/1986	CA1212419A1 Differentially nonlinear convolutional channel coding with expanded set of signalling alphabets
10/01/1986	EP0195989A2 Method of demodulating an input signal phase-modulated by a binary bit sequence, and circuit arrangement therefor
09/1986
09/30/1986	US4615040 High speed data communications system
09/30/1986	US4615038 Equalization of modulated data signals utilizing tentative and final decisions and replication of non-linear channel distortion
09/30/1986	US4615037 Phase scatter detection and reduction circuit and method
09/30/1986	US4614910 Quarternary differential PSK demodulator
09/24/1986	EP0195492A2 Receiver for analyzing incoming signals
09/24/1986	EP0195403A2 Apparatus for the gated modulation of a radio-frequency carrier signal
09/23/1986	US4613977 Digital Navstar receiver
09/23/1986	US4613976 Constant envelope offset QPSK modulator
09/23/1986	US4613975 Selective fading protection system
09/23/1986	US4613974 Method and system for modulating a carrier signal
09/23/1986	US4613973 For communicating digital data by radio frequency
09/23/1986	CA1211812A1 Distortion compensation apparatus and method
09/23/1986	CA1211799A1 Apparatus for correcting frequency-dependent attenuation of the transmitting medium in signal transmission
09/23/1986	CA1211794A1 Method of correcting the frequency of a local carrier in a receiver of a data transmission system and receiver using this method
09/23/1986	CA1211793A1 Transmitter for transmitting an fsk-modulated signal
09/17/1986	EP0194903A2 Digital quadrature amplitude modulator
09/17/1986	EP0194902A1 Method and system for spread spectrum transmission, especially for information transmission in an electric power distribution network
09/17/1986	EP0194791A2 Digitally implemented modulators
09/17/1986	CN86100930A Tone detector with pseudo phase locked loop
09/16/1986	US4612518 QPSK modulator or demodulator using subharmonic pump carrier signals
09/16/1986	US4612515 PLL having phase comparator with hysteresis characteristics
09/16/1986	US4612509 Frequency shift keyed demodulator
09/16/1986	CA1211517A1 Correlated signal processor and modulator

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