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7583702 |
Method of transmitting paging indicator and notification indicator and corresponding modulation and demodulation devices
The present invention discloses a method of transmitting a first signal and a second signal in a wideband code-division multiple access network, wherein a probability of the appearance of signal...
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7443919 |
Channel estimation for wireless systems with multiple transmit antennas
In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using...
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7127001 |
Channel estimation for wireless systems with multiple transit antennas
In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using...
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6999431 |
Voice over internet protocol
A voice over Internet protocol (VOIP) directory service for communications users of an enterprise locates a telephone or work station of a called party for the purpose of setting up real-time...
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6940396 |
Concurrent phase communication in TWACS
A method for concurrently communicating over each phase of an electrical power distribution network (N). A first outbound signal (SO 1 ) is transmitted over one phase (AN-A) of a bus (S) by an...
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6876672 |
Method of transmitting data on multiple carriers from a transmitter to a receiver and receiver designed to implement the said method
A method of transmitting data on multiple carriers is disclosed, the method consisting, on a transmitter side, of binary to signal coding of the data to be transmitted so as to form modulation...
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6704366 |
Time and frequency interleaving system for transmitting digital data between fixed or mobile stations
A transmitter for a radio transmission system has an encoder for encoding data according to an error correction code and supplying a digital output stream of bits which are then distributed over a...
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6693917 |
Digital subchannel transceiver for transmitting data
A system for transmitting subchannel data over the same media as high speed data, especially DC balanced high speed data. A digital transmitter receives subchannel data and modulates it onto a...
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6587452 |
High performance signal structure with multiple modulation formats
A mapping memory, for use with a transmitter, for mapping a first signal segment and a second signal segment of a packet so that each signal segment has the same average power level. Each signal...
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6539008 |
Method for inserting power control bits in the CDMA mobile system
A power control bit inserting method between a base station and a terminal. The base station and the terminal each use a plurality of adjacent frequency bands as signal paths with independent...
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6477153 |
Method and apparatus for using the sidelobe of a long range antenna for a short range communication link
A communication satellite system ( 100 ) is established using one or more satellite constellations ( 110, 120 ). The two or more satellite groups ( 110, 120 ) are connected via long range...
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6456650 |
Splitterless modem using harmonics reduction
In a splitterless Digital Subscriber Line (DSL) modem 30 , a receiver architecture ( 100 ) that permits monitoring of harmonics within the upstream channel of a DSL connection. The receiver ( 100...
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6381252 |
Method and system for managing communication resources
A method and system for managing and allocating multiple communication resources to ensure relatively equal usage. The selection of the resource can be performed by retrieving a pointer value, and...
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6181924 |
Method and system for rejecting interfering signals
A method and system for rejecting interfering signals in a wireless communication system employing antenna diversity. According to the method, the angle between an interfering signal and a desired...
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5809030 |
Frequency division multiple access (FDMA) dedicated transmission system, transmitter and receiver used in such a transmission system
The demodulation of data modulated on a set of carriers with equidistant frequencies by a plurality of transmitters (T1 . . . Tn) is executed in the present transmission system (TS) by a discrete...
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5666382 |
Method and apparatus for communicating in the presence of power and propulsion system interference
A method and apparatus for communicating over a track circuit which includes an interference signal. The invention includes sampling the interference signal on the track circuit at a predetermined...
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5636247 |
Information transmission system
A system for transmitting information over an OFDM channel using phase shift keying encoding employs a bit mapping encoder to reduce the crest factor (ratio of peak voltage to RMS voltage). For a...
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5566207 |
Digital FM synthesizer for record circuitry
A digital synthesizer for record circuitry of, e.g., a VCR, is supplied with digital samples representing a video signal. A calculator stage, responsive to the digital samples calculates a sequence...
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5559799 |
Modulator and demodulator apparatus as well as modulation and demodulation method
A modulator and demodulator apparatus for use with a network is provided. The modulator and demodulator apparatus comprises a modulation section which includes a timing phase discrimination section...
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5533030 |
Radiotelephone system with the character of a local or auxiliary communications apparatus
A transmission process with specific adaptive properties in an analog or mixed analog-digital transmission system, having a fixed base station and a number of subscriber station independent of one...
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5519732 |
Digital baseband to IF conversion in cellular base stations
A system and method for converting and combining multiple digital baseband signals into a composite IF signal for subsequent up converting and transmitting as an RF signal. The system and method...
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5428610 |
FM radio system employing time shared wide SCA for digital data band
A wide band, wide area FM-SCA radio system has a central station that transmits multiple audio signals and digital data signals through a satellite network to FM stations participating in the...
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5428600 |
Method and devices for transmitting data, particularly by satellite
A relay satellite receives, from stations on the ground, modulated high-frequency signals situated in two different frequency bands. One of the modulations is narrow band and the other broad band....
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5128933 |
Process and device for the radio transmission of coded data superimposed on a traditional frequency-modulated broadcast
The device comprises an input unit for generating coded data to be transmitted, an FSK coder-modulator for modulating, by frequency shift, the coded data to be transmitted, in a frequency range...
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4962496 |
Transmission of data via power lines
A method for transmitting data in the form of a sequence of data words according to PLBus communications protocol in a channel (20) carrying data transmitted, according to a different protocol, in...
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4852086 |
SSB communication system with FM data capability
A radio communications system is described in which analog voice signals are transmitted and received via single sideband amplitude modulation, and digital data signals are transmitted and received...
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4704715 |
Information communication system
In this information transmission system, a PCM encoder is provided for time-division multiplexing multichannel audio signals and a digital character information signal to generate a time-division...
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4680749 |
Duplex radio transceiver having improved data/tone and audio modulation architecture
A novel circuit architecture is disclosed for achieving audio, tone, and digital data signal modulation in a full duplex radio transceiver. A single signal source is utilized to generate both...
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4630134 |
System for recording and reproducing multiplex information
A method for recording and reproducing multiplex information in which two subcarriers of the same frequency are modulated by two respective subchannel signals. The modulated signals are added to...
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4523311 |
Simultaneous transmission of speech and data over an analog channel
The present invention relates to a technique for recovering each of an entire analog speech signal and a modulated data signal simultaneously received over a transmission channel such as a common...
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4512013 |
Simultaneous transmission of speech and data over an analog channel
The present invention relates to a technique for transmitting an entire analog speech signal and a modulated data signal over a transmission channel such as a common analog telephone speech...
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4489411 |
Process and a circuit arrangement for signal transmission using an amplitude-modulated radio broadcasting system
For the simplified text or picture data signal transmission through a broadcasting system, an additional phase and/or frequency modulation is produced in amplitude modulated transmitters. In a...
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4379947 |
System for transmitting data simultaneously with audio
An FM broadcasting system is disclosed for transmitting a data signal simultaneously with an auxiliary audio program on the same subcarriers of an FM transmission channel. The main program is...
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4302629 |
Digital data transmission system
Simultaneous conventional telephone signaling and audio communication, plus digital data transmission, on nonloaded telephone wires is disclosed. Modems (21) connect a telephone (23) and a digital...
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4278952 |
Quantized angle modulator
A first stream of digits is converted to a second stream of alternating-current digits, each of the same amplitude and the same duration which may be different from the duration of the digits of...
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3974337 |
FM television telephone system
A television telephone system, wherein frequency-modulation with a low modulation index is effected by using a carrier wave of a slightly higher frequency than the maximum frequency of a video...
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3875394 |
CORRELATION TYPE PHASE DETECTOR
The phase angles of each of a plurality of frequency multiplexed signals derived on a common lead and having predetermined frequencies are determined relative to predetermined phase angles of...
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3860873 |
FM TRANSMISSION SYSTEM
An FM transmission system is disclosed in which audio signals are stereo multiplexed prior to being applied to produce corresponding FM signals having carrier frequencies outside of the normal FM...
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3849744 |
BASE-BAND DELAY EQUALIZER
A base-band delay equalizer for compensating for envelope delay distortion in angle modulation transmission systems such as FDM-FM multiplex telephone signal transmission, FM color television...
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3845391 |
COMMUNICATION INCLUDING SUBMERGED IDENTIFICATION SIGNAL
A technique for identifying a program with an identification code in which the code is modulated onto an audio frequency subcarrier and transmitted with the program. A short time period, narrow...
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3754101 |
FREQUENCY RATE COMMUNICATION SYSTEM
A communication system for transmitting a plurality of analog or digital information signals to a receiver with an improvement in band width utilization over conventional systems. A system with a...
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3632891 |
CIRCUIT ARRANGEMENT FOR THE INSERTION OF TELEPHONE CHANNELS IN THE INTERMEDIATE FREQUENCY JUNCTIONS FOR REPEATER STATIONS
A circuit arrangement for the insertion of additional communication channels such as telephone channels and the like in the intermediate frequency junctions of the relaying stations, wherein the...
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3603882 |
PHASE SHIFT DATA TRANSMISSION SYSTEMS HAVING AUXILIARY CHANNELS
In a data transmission system utilizing phase shift modulation of a carrier signal to transmit pulse coded data from one station to another an auxiliary low frequency signal is transmitted between...
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3511936 |
MULTIPLY ORTHOGONAL SYSTEM FOR TRANSMITTING DATA SIGNALS THROUGH FREQUENCY OVERLAPPING CHANNELS
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3465103 |
SYSTEM FOR COMBINING PLURAL ISOLATED PHYSIOLOGICAL SIGNALS WITHOUT MUTUAL INTERFERENCE AND WITH REDUCED NOISE LEVEL
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3462688 |
COMMUNICATION SYSTEM FOR CLASSROOM USE AND THE LIKE
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3349182 |
Phase-modulated frequency division multiplex system
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3310740 |
Directional radio system with angle modulation
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3163718 |
Frequency and time allocation multiplex system
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3048661 |
Multiplex communication receiver
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