H04J 1 - Frequency-division multiplex systems

Patents for H04J 1 - Frequency-division multiplex systems (15,293)
01/1995
01/03/1995	US5379141 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links
12/1994
12/27/1994	US5377232 Frequency synchronized bidirectional radio system
12/22/1994	DE4234491C1 Digital filter bank
12/08/1994	WO1994028637A1 A method and apparatus for determining signal usability
12/07/1994	EP0627139A1 Feedback level estimator between loudspeaker and microphone
12/06/1994	US5371761 Transmission system and receiver for this system
11/1994
11/29/1994	US5369692 Page party system
11/08/1994	CA1332961C Multiple reuse of an fm band
11/02/1994	EP0622003A1 Multichannel television signal scrambling and descrambling system and method
10/1994
10/27/1994	WO1994024772A1 Method and apparatus for separating channels from a radio frequency transmitter
10/27/1994	CA2136443A1 Method and apparatus for separating channels from a radio frequency transmitter
10/26/1994	EP0620959A1 Frequency synchronized bidirectional radio system
10/26/1994	EP0559716B1 Process and arrangement for compensating adjacent channel interference in a double sideband amplitude modulation system
10/25/1994	US5359595 Skywave adaptable network transceiver apparatus and method using a stable probe and traffic protocol
09/1994
09/21/1994	EP0616454A1 Multi-resolution digital transmission system
09/21/1994	EP0616453A1 Receiver for differentially encoded PSK signals
09/15/1994	WO1994021061A1 A multi-channel digital transmitter and receiver
09/14/1994	EP0527141B1 Speech-transmission system
09/08/1994	EP0622003A4 Multichannel television signal scrambling and descrambling system and method.
09/06/1994	US5345437 System for controlling frequency multiplexing modems
09/01/1994	DE4337135C1 Drop-and-add multiplexer for converting and conditioning a frequency-division multiplex signal
08/1994
08/31/1994	EP0613264A2 Group modulator
08/31/1994	CN1091568A Method of detecting a paging channel in a multi-frequency radio pager network
08/31/1994	CN1091563A A method for establishing communication between tasks of a limited number of repeaters in a communication system
08/30/1994	CA1331805C Passenger vehicle polling system
08/17/1994	EP0358688B1 Method for dynamically allocating data channels on a trunked communication system
08/04/1994	WO1994017610A1 Microwave multiplexer with channels of varying fractional bandwidths
08/04/1994	CA2154457A1 Microwave multiplexer with channels of varying fractional bandwidths
08/03/1994	EP0608281A1 Process for reducing frequency interlacing during acoustic or optical signal transmission and/or recording.
08/02/1994	CA2027364C Varying bandwidth digital signal detector
07/1994
07/27/1994	EP0607755A1 Method for data transmission in a cellular mobile radio system
07/26/1994	USRE34676 Fiber optic digital data transmitting system
07/21/1994	CA2330522A1 Method of isolating a block frequency on the basis of a signal formatted in blocks
07/07/1994	WO1994015418A1 Communication between tasks within repeaters of a communication system
07/07/1994	CA2130546A1 A method for establishing communication between tasks of a limited number of repeaters in a communication system
07/05/1994	US5327423 Method and a network for transmitting messages in frequency channels
06/1994
06/28/1994	US5325423 Interactive multimedia communication system
06/21/1994	US5323391 Multi-channel digital transmitter and receiver
06/21/1994	US5323384 Method for establishing communication between tasks of a limited number of repeaters in a communication system
06/16/1994	DE4305009C1 Radio data transmission system for anti-aircraft weapons system - uses different FM transmission channels in high atmospheric attenuation frequency range
05/1994
05/26/1994	WO1994011981A1 Interactive multimedia communication system
05/26/1994	WO1994011961A1 Method and arrangement for dynamic allocation of multiple carrier-wave channels for multiple access by frequency division multiplexing
05/26/1994	CA2148090A1 Interactive multimedia communication system
05/25/1994	EP0598451A1 Multiple access telecommunication network
05/20/1994	CA2103172A1 Multiple access telecommunication network
05/04/1994	EP0594755A1 Power distribution line communication system for reducing effects of signal cancellation
04/1994
04/27/1994	EP0594358A2 Method and apparatus for reducing the peak-to-average power in multi-carrier RF communication systems
04/27/1994	EP0594352A2 Circuitry for minimizing peak power in an amplifier carrying a plurality of signals of differing frequencies
04/26/1994	US5307191 Communications method and network with frequency allocation
04/12/1994	US5302914 Method and apparatus for reducing the peak-to-average power in multi-carrier RF communication systems
04/05/1994	US5301052 Communication method and network using optical fibers with frequency multiplexing
04/05/1994	US5300894 Circuitry for minimizing peak power in an amplifier carrying a plurality of signals of differing frequencies
03/1994
03/30/1994	EP0589599A1 Multiplexed signal transmission system
03/30/1994	EP0589594A2 Frequency-multiplexed cellular telephone cell site base station and method of operating the same
03/29/1994	US5299192 Digital filter-type frequency demultiplexing device
03/17/1994	WO1994006231A1 Digital signal transmission system using frequency division multiplex
03/15/1994	US5295138 Apparatus and method for optimal frequency planning in frequency division multiplexing transmissions
03/15/1994	CA2032089C Optimized wavelength-division-multiplexed lightwave communication system
03/15/1994	CA2004860C Efficient digital frequency division multiplexed signal receiver
03/08/1994	US5293382 Method for FDMA signal multiplexing and demultiplexing
03/08/1994	US5293329 Apparatus for and method of digital signal processing
03/02/1994	EP0585089A2 Digital block processor for transmitting a plurality of channels in a wireless radiotelephony system
03/02/1994	EP0584248A1 Dual mode transmitter and receiver
03/01/1994	US5291516 Dual mode transmitter and receiver
02/1994
02/27/1994	CA2100043A1 Digital block processor for transmitting a plurality of channels in a wireless radiotelephony system
02/22/1994	US5289464 Frequency-multiplexed cellular telephone cell site base station and method of operating the same
01/1994
01/26/1994	EP0580216A1 System and receiver for orthogonal frequency division multiplexed signals provided with a frequency synchronisation circuit
01/11/1994	US5278837 Multiple user digital receiver apparatus and method with combined multiple frequency channels
01/11/1994	US5278826 Method and apparatus for digital audio broadcasting and reception
01/11/1994	US5278690 Apparatus and method for synchronizing a plurality of remote transmission and receiving stations and providing automatic gain control of the synchronizing signal
01/05/1994	EP0576797A2 Reduction of interchannel harmonic distortions in a analog and digital signal multiplex
12/1993
12/07/1993	US5268905 Sub band filters
12/01/1993	EP0571745A1 Cellular mobile radio system with multiplicity of CDMA carriers for ISDN applications
11/1993
11/18/1993	EP0570210A2 System for controlling frequency multiplexing modems
11/16/1993	US5263019 Method and apparatus for estimating the level of acoustic feedback between a loudspeaker and microphone
11/02/1993	US5258995 Wireless communication system
10/1993
10/20/1993	EP0565659A1 Multichannel tdm communication system slot phase correction
10/05/1993	US5251218 Efficient digital frequency division multiplexed signal receiver
09/1993
09/29/1993	EP0562875A1 Multiresolution QAM system
09/29/1993	CN1076816A System of communication
09/21/1993	US5247515 Apparatus for extracting one from many multiplexed signals
09/07/1993	US5243629 Multi-subcarrier modulation for hdtv transmission
09/02/1993	WO1993017510A1 Feedback level estimator between loudspeaker and microphone
08/1993
08/31/1993	US5241544 Multi-channel tdm communication system slot phase correction
08/10/1993	US5235619 Cable television radio frequency subscriber data transmission apparatus and rf return method
08/04/1993	EP0553841A2 Method and apparatus for digital signal transmission using orthogonal frequency division multiplexing
07/1993
07/22/1993	WO1993014597A1 Multichannel television signal scrambling and descrambling system and method
07/22/1993	WO1993014585A1 Frequency synchronized bidirectional radio system
07/10/1993	CA2069462A1 Rf repeater arrangement with reduced noise for wireless telephones
07/06/1993	US5226081 Multi-carrier communication system using ciphered carrier bit assignment information
06/1993
06/30/1993	EP0549451A1 Frequency multiplex apparatus employing digital filters
06/15/1993	US5220557 Multiple use digital transmitter/transceiver with time multiplexing
06/09/1993	EP0545031A1 Method of processing television signals on carrier and/or sound signals and use of the method
06/09/1993	EP0507799A4 Method and apparatus for transmitting broadband amplitude modulated radio frequency signals over optical links
05/1993
05/26/1993	CN1021006C Duplex centerless frequency-deivision multiple access carrier telephone system
05/25/1993	US5214641 Mixed analog digital secondary channel FSK modem
05/13/1993	WO1993009617A1 Multichannel tdm communication system slot phase correction
05/13/1993	WO1993009493A1 A wireless communication system
05/12/1993	CN1072048A Communication signal having time domain pilot component
04/1993
04/29/1993	WO1993009622A1 Communication signal having a time domain pilot component

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