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| Number | Title | Issue Date |
| 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 bit “1” or “0” in each signal of the first signal and the secon... | 09/01/2009 |
| 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 various sets of training symbols. ... | 10/28/2008 |
| 7330555 | Coding device and method, and recording medium An L-channel signal and an R-channel signal are input into a subtractor in which the difference between the L-channel signal and the R-channel signal is determined. The resulting signal is input into first and second multipliers. In the first multiplier, a mixed out... | 02/12/2008 |
| 7324431 | Method and device for allocating a communication signal to multiple carrier frequencies in a multi carrier communication scheme A method of allocating a communication signal to multiple carrier frequencies in a multi carrier communication scheme is disclosed. The method involves a step of defining a pilot pattern (76), each pilot symbol of the pattern defining a cluster of carrier fre... | 01/29/2008 |
| 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 various sets of training symbols. ... | 10/24/2006 |
| 7109933 | Wearable jacket having communication function, and endoscope system employing wearable jacket A wearable jacket includes a 2D-DST substrate shaped to cover a body of a subject person. The 2D-DST substrate includes a first conductive sheet, a second conductive sheet and a plurality of communication modules. The first and second conductive sheets are overlappe... | 09/19/2006 |
| 7110721 | Apparatus, method and program for communication test, and recorded medium on which that program has been recorded There is provided a communication test apparatus that can avoid a pause of a communication test for executing a signaling when executing the communication test, and reduce the time for the communication test. Because the communication test apparatus establish... | 09/19/2006 |
| 7106709 | Timing drift compensation in wireless packet-based systems A radio receiver system (30) comprises a radio receiver (41), a receiver sample clock (60), which is used for sampling a modulated base-band signal; and a timing correction unit (100). The timing correction unit (100) performs, in ... | 09/12/2006 |
| 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 signals, of modulating a plurality of sub-carriers with the modulation si... | 04/05/2005 |
| 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 selectable number of carriers belonging to a group of carr... | 03/09/2004 |
| 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 subchannel carrier as the host signal in the preferred embodim... | 02/17/2004 |
| 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 segment is characterized by a different modulation format. T... | 07/01/2003 |
| 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 signal paths of a real part and an imaginary part given to each... | 03/25/2003 |
| 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 crosslinks (145) which provide a communication path between the long rang... | 11/05/2002 |
| 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) can detect the harmonics by monitoring the harmonics in some e... | 09/24/2002 |
| 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 testing the resource associated with the pointer value mon... | 04/30/2002 |
| 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 carrier signal is determined and used to estimate an offse... | 01/30/2001 |
| 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 multitone receiver (DMT-R). The transmitters (T1 . . . Tn) ... | 09/15/1998 |
| 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 sampling frequency to produce a sampled interference signa... | 09/09/1997 |
| 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 16 subchannel OFDM system using QPSK encoding, a first set ... | 06/03/1997 |
| 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 of pulse periods defining a pulse duration modulated sign... | 10/15/1996 |
| 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 for receiving, as an input signal thereto, a demodulation... | 09/24/1996 |
| 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 another. Information from the base station is transmitted ... | 07/02/1996 |
| 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 use distributed symmetrical circuit architecture to form a c... | 05/21/1996 |
| 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. The satellite retransmits a multiplexed signal resulting f... | 06/27/1995 |
| 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 system. Each FM station demodulated and time multiplexes the au... | 06/27/1995 |
| 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 located between about 15 and 18 KHz, a mixer circuit for supe... | 07/07/1992 |
| 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 the form of timed bursts of a signal, comprising: producin... | 10/09/1990 |
| 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 via narrowband frequency modulation in a single trunked r... | 07/25/1989 |
| 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 multiplexed, or TDM, information signal. The TDM informatio... | 11/03/1987 |
| 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 transmitted carrier and receiver local oscillator injection sig... | 07/14/1987 |
| 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 two main channel signals to produce two corresponding sum si... | 12/16/1986 |
| 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 analog telephone speech channel. In the received composite ... | 06/11/1985 |
| 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 channel. The present technique multiplexes the entire modulated d... | 04/16/1985 |
| 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 preferred but relative slow transmission system, a frequency m... | 12/18/1984 |
| 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 transmitted on the FM transmission channel carrier and the auxi... | 04/12/1983 |
| 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 data terminal (25) to one end of the telephone wires. A da... | 11/24/1981 |
| 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 the first stream, and which transmits at least the informati... | 07/14/1981 |
| 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 signal, and the video signal thus modulated is transmitted thr... | 08/10/1976 |
