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)
11/1999
11/17/1999EP0956675A1 Am compatible digital waveform frame timing recovery and frame synchronous power measurement
11/17/1999EP0956667A1 Method and apparatus for variably allocating upstream and downstream communication spectra
11/17/1999EP0956644A1 Automatic frequency control circuit
11/17/1999CN1235741A Method of combining several signals, and base station
11/17/1999CN1235716A Method for wireless information transfer
11/17/1999CN1235438A System, apparatus and method for multi-carrier transmission
11/16/1999US5987078 Carrier regenerating circuit
11/16/1999US5987077 Method of synchronizing a digital signal receiver
11/16/1999US5987075 FSK signal receiver
11/16/1999US5987074 Digital communication demodulator, digital communication demodulation method and digital demodulation circuit
11/16/1999US5987073 Symbol timing recovery network for a carrierless amplitude phase (CAP) signal
11/16/1999US5987072 Phase modulation scheme and apparatus
11/16/1999US5987071 Digital modulator and digital demodulator
11/16/1999US5987070 VSB mode selection system
11/16/1999US5987069 Method and apparatus for variably allocating upstream and downstream communication spectra
11/16/1999US5987064 Eye pattern display method, eye pattern display apparatus, and communications apparatus
11/16/1999US5987063 Method for compensating channel errors in a digital data communication system
11/16/1999US5987061 Modem initialization process for line code and rate selection in DSL data communication
11/16/1999US5987020 Intermittent transmission control system
11/16/1999US5986512 Σ-Δ modulator-controlled phase-locked-loop circuit
11/16/1999US5986483 Direct digital frequency systhesizer
11/16/1999CA2196010C Adaptive iir multitone detector
11/16/1999CA2130269C Psk demodulator
11/16/1999CA2113135C Carrier phase estimation system using filter
11/11/1999WO1999057912A2 Dc offset compensation for zero if quadrature demodulator
11/11/1999WO1999057861A1 Method for transmitting a message impressed on a signal as a useful signal
11/11/1999WO1999057805A1 Methods and apparatus for timing recovery of vestigial sideband (vsb) modulated signals
11/11/1999WO1999049586A3 Spread spectrum transceiver for use in wireless local area network and having multipath mitigation
11/11/1999WO1999045672A3 Wireless local area network system
11/11/1999WO1999044326A3 Ofdm frame synchronisation and equalisation system
11/10/1999EP0955766A2 Voice and data modem
11/10/1999EP0955754A1 Method and apparatus for achieving and maintaining symbol synchronization in an OFDM transmission system
11/10/1999EP0955753A1 BPSK modulator
11/10/1999EP0955752A2 Pi/4-DQPSK mapper and shaper using a look-up table
11/10/1999EP0955751A2 Demodulator circuit for ask modulated wave
11/10/1999EP0955744A2 Capacity allocation for ADSL
11/10/1999CN1234937A Receiver with controllable amplifier means
11/10/1999CN1234936A Transmission of digital signals by orthogonal frequency division multiplexing
11/10/1999CN1234931A Transmitter, receiver, transmitting method and receiving method
11/10/1999CN1234926A Signal processor employing spectral property of signals
11/10/1999CN1234696A Selective paging wireless receiver using direct conversion method
11/10/1999CN1234670A Multi-carrier transmission system, transmission unit and transmission method thereof
11/10/1999CN1234668A Communication apparatus
11/09/1999US5983362 Non-interrupted operation control apparatus for a modulator-demodulator
11/09/1999US5982822 Viterbi decoder
11/09/1999US5982821 Frequency discriminator and method and receiver incorporating same
11/09/1999US5982820 Bandpass phase tracker with hilbert transformation before plural-phase analog-to-digital conversion
11/09/1999US5982819 Modulation format adaptive messaging receiver and method thereof
11/09/1999US5982818 Method for implementing trellis codes for ISI channels
11/09/1999US5982812 Method and apparatus for monitoring frequency synthesizer locking time
11/09/1999US5982809 Method and apparatus for carrier recovery and compensation in spread spectrum communications
11/09/1999US5982807 High data rate spread spectrum transceiver and associated methods
11/09/1999US5982294 Paging receiver which performs data communication protocol analysis through execution of control program
11/09/1999US5982235 Automatic gain control circuit
11/09/1999US5982200 Costas loop carrier recovery circuit using square-law circuits
11/05/1999CA2266870A1 Table-driven modulation signal generation
11/05/1999CA2236649A1 Method and apparatus for encoding of digital signals for transmission and/or storage, and decoding such encoded signals following such transmission and/or storage
11/04/1999WO1999056444A1 Method and apparatus for performing a modulation
11/04/1999WO1999056443A1 Π/4 qpsk modulator
11/04/1999WO1999056442A2 Transmitter/receiver for gmsk and offset-qam
11/04/1999WO1999056425A1 Transmitter
11/04/1999WO1999056424A1 Orthogonal frequency division multiplexing receiver system
11/04/1999WO1999056400A1 Method for neutralising a transmitter tube
11/04/1999WO1999056399A2 Simplified receiver for frequency shift keyed signals
11/04/1999WO1999056388A2 If-receiver
11/04/1999WO1999045680A3 A system and a method for transfer of a digital information carrying signal
11/04/1999WO1999043090A9 Quadrature-free rf receiver for directly receiving angle modulated signal
11/04/1999WO1999039464A3 A system and a method for information security in optical communication networks
11/03/1999EP0954158A2 Data optimized codec
11/03/1999EP0954145A2 QAM or PSK demodulator with two phase detectors
11/03/1999EP0953247A1 Method and apparatus for channel estimation in ofdm transmission system
11/03/1999EP0953246A2 Method for doubling levels of coding
11/03/1999EP0953242A2 Symbol lock detector
11/03/1999EP0953234A2 Circuit for two-wire / four-wire conversion
11/03/1999EP0953233A1 Disabling tone detector for network echo canceller
11/03/1999EP0953232A1 Compensation of delay in linearization loop of power amplifier
11/03/1999EP0683950A4 Efficient amplitude/phase modulation amplifier.
11/03/1999CN1234149A Frequency Division multiplexed transmission of sub-band signals
11/03/1999CN1233912A Synchrodyning of VSB and QAM final I-F signals supplied by separate converters in QAM/VSB digital TV receiver
11/02/1999US5978823 Methods and apparatus for implementing and controlling a digital modulator
11/02/1999US5978662 Circuit arrangement comprising a Cartesian amplifier
11/02/1999US5978658 Portable analog communication device with selectable voice and data filters
11/02/1999US5978421 Envelope control unit and digital modulator using the envelope control unit and digital modulation method
11/02/1999US5978420 Methods and apparatus for implementing a digital modulator
11/02/1999US5978415 Automatic amplitude equalizer
11/02/1999US5978123 Method for the transmission of a low-rate supplementary channel in high-rate coherent optical transmission systems
11/02/1999US5977821 Digital detection method and circuit for PSK modulated signals
11/02/1999US5977820 Phase estimating circuit and demodulating circuit
10/1999
10/30/1999CA2269580A1 Channel estimation using soft-decision feedback
10/28/1999WO1999055048A1 Method and an arrangement for modulating a signal
10/28/1999WO1999055030A1 A wireless internet access method and system
10/28/1999WO1999055025A2 Peak to average power ratio reduction in multicarrier modulation system
10/28/1999WO1999055015A1 Direct conversion receiver
10/28/1999WO1999055010A1 Method and apparatus for tcm decoding using qpsk viterbi decoder
10/28/1999WO1999055009A1 45 degree phase ambiguity resolution for 8psk modulation
10/28/1999WO1999055008A1 Channel encoding/decoding apparatus and method for communication system
10/28/1999WO1999054998A1 Lnb drift search system for dbs products
10/28/1999WO1999043132A3 A method and a circuit for am demodulation
10/28/1999WO1999043080A9 Direct digital synthesis of precise, stable angle modulated rf signal
10/28/1999WO1999040685A3 Method for processing telephone signals delivered by an analog telephone terminal
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