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959results about "Modulation with suppressed carrier" patented technology
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Rectifying-and-modulating circuit and wireless power receiver incorporating the same
A wireless power receiver includes a power receiving circuit wirelessly receiving power transmitted from a wireless power transmitter so as to generate an induced current, and a rectifying-and-modulating circuit including first to eighth switches and a control unit. The control unit is operable to control operation of each of the first to eighth switches between conduction and non-conduction. Accordingly, the first to fourth switches cooperatively constitute a full-bridge rectifier for rectifying the induced current generated by the power receiving circuit, and each of the fifth to eighth switches is operable to switch synchronously with a respective one of the first to fourth switches or to became non-conducting, thereby changing an amplitude of the induced current.
Owner:RICHTEK TECH
Mobile body discrimination apparatus for rapidly acquiring respective data sets transmitted through modulation of reflected radio waves by transponders which are within a communication region of an interrogator apparatus
InactiveUS6946950B1Rapid and reliable communication operationReduce the possibilityElectric signal transmission systemsDigital data processing detailsData setEngineering
In a mobile body discrimination apparatus having an interrogator apparatus and a plurality of transponders each capable of transmitting information to the interrogator apparatus by modulation of radio waves that are reflected from a transponder antenna, which can be attached to respective articles, store data concerning the articles, and transmit the data to the interrogator apparatus in response to a command signal transmitted while the transponder traverses a communication region of an antenna of the interrogator apparatus, each transponder is configured to begin sending such response data after a randomly determined time interval following reception of the command signal, thereby reducing the probability of data conflict when plural transponders are within the communication region. In addition, radio waves from a second antenna of the interrogator apparatus are directed into that communication region in the intervals between transmissions of the command signal, thereby increasing the power level of radio waves that are reflected by a transponder antenna or used by a rectifier circuit to supply power for operating the transponder circuits.
Owner:REDWOOD TECHNOLOGIES LLC
Transmission circuit and communication device
InactiveUS20120099675A1Smooth switchingPrevent stateHigh frequency amplifiersModulation with suppressed carrierAudio power amplifierVariable-gain amplifier
Provided is a transmission circuit which allows smooth switching of the operation mode when switching the operation mode of the transmission circuit. A power amplifier 14 includes: a first input terminal to which a direct-current voltage or a voltage in accordance with an amplitude signal M is supplied; a second input terminal to which an output signal from a first variable gain amplifier 171 or an output signal from a second variable gain amplifier 172 is inputted; and a third input terminal to which an output signal from a first bias circuit 15 or an output signal from a second bias circuit 16 is inputted. A control section 11 switches the operation mode of the transmission circuit so that at least one of the first input terminal, the second input terminal, and the third input terminal of the power amplifier is prevented from being in a no input state.
Owner:PANASONIC CORP
Digital broadcast transmitting and receiving system having an improved receiving performance and signal processing method thereof
ActiveUS20050249301A1Improve reception performanceModulation with suppressed carrierCode conversionData streamEqualization
A digital broadcast transmitting and receiving system and a signal processing method thereof that improves the receiving performance of the system. A digital broadcast transmitter can include a randomizer to receive and randomize a data stream into a specified position of which stuff bytes are inserted, a stuff-byte exchange unit to generate known data having a predefined pattern and insert the known data into the specified position of the data stream into which the stuff bytes are inserted, an encoder to encode the data stream output from the stuff-byte exchange unit for an error correction, and a modulator and RF converter to modulate the encoded data stream, RF-convert the modulated data stream and transmit the RF-converted data. The digital broadcast receiving performance can be improved even in an inferior multi-path channel by detecting the known data from the received transmission and using the known data for synchronization and equalization in a digital broadcast receiver.
Owner:SAMSUNG ELECTRONICS CO LTD
High-Efficiency Envelope Tracking Systems and Methods for Radio Frequency Power Amplifiers
InactiveUS20090191826A1Improve efficiencyBandwidthDc network circuit arrangementsResonant long antennasPower efficientAudio power amplifier
Envelope tracking (ET) methods and systems for controlling the delivery of power to radio frequency power amplifiers (RFPAs). An exemplary ET system includes an RFPA and a wide bandwidth capable and power efficient envelope modulator that includes a first power supplying apparatus and a second power supplying apparatus. The first power supplying apparatus includes a switch-mode converter and a regulator. The first mode converter is operable to dynamically step down a fixed power supply voltage according to amplitude variations in an envelope signal received by the regulator, and use the resulting dynamic power supply signal to power the regulator. The second power supplying apparatus is connected in parallel with the first power supplying apparatus. Depending on a power of an output signal to be generated at an output of the power amplifier, power is supplied to the power amplifier from either or both of the first and second power supplying apparatuses.
Owner:APPLE INC
Method of processing traffic information and digital broadcast system
ActiveUS20070086488A1Noise robustData augmentationBroadcast specific applicationsModulation with suppressed carrierMultiplexingDigital broadcasting
A digital broadcast transmitting / receiving system and a method for processing data are disclosed. The method for processing data may enhance the receiving performance of the receiving system by performing additional coding and multiplexing processes on the traffic information data and transmitting the processed data. Thus, robustness is provided to the traffic information data, thereby enabling the data to respond strongly against the channel environment which is always under constant and vast change.
Owner:LG ELECTRONICS INC
Centralized optical-fiber-based wireless picocellular systems and methods
InactiveUS20070286599A1Time-division optical multiplex systemsModulation with suppressed carrierEngineeringOptical coupling
Owner:CORNING CABLE SYST LLC
Packet identification mechanism at the transmitter and receiver for an enhanced ATSC 8-VSB system
InactiveUS20020191712A1Reduce payloadModulation with suppressed carrierAmplitude-modulated carrier systemsComputer hardwareTelevision system
A flexible digital transmission system that improves upon the ATSC A / 53 HDTV signal transmission standard. The system includes a digital signal transmitter for generating a first Advanced Television Systems Committee (ATSC) standard encoded 8-VSB bit stream and, for generating an encoded new robust bit stream for transmitting high priority information bits, wherein symbols of the new bit stream are capable of being transmitted according to a transmission mode including: a 2-VSB mode and a 4-VSB transmission mode. The standard 8-VSB bit stream and new bit stream may be simultaneously transmitted over a terrestrial channel according to a broadcaster defined bit-rate ratio. The transmission system includes a control mechanism for generating information needed for encoding robust packets at a transmitter device. It also includes a mechanism for encoding control parameters and multiplexes the generated information with the standard and robust bit-streams for transmission. A receiver architecture is additionally provided to decode standard and robust bit-streams transmitted by the transmitter device.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Enhanced VSB transmitter and receiver
InactiveUS20060126757A1Amplitude demodulation by homodyne/synchrodyne circuitsModulation with suppressed carrierMultiplexerPre processor
An enhanced VSB transmitter includes a data attribute generator which generates data attribute information based on a current enhanced mode map, and a VSB pre-processor which codes first and second supplemental data for error correction, interleaves the coded supplemental data, and expands the interleaved data at first and second rates, respectively, according to the data attribute information. The transmitter further includes a multiplexer which multiplexes main data with the expanded supplemental data according to the data attribute information, and a VSB processor which codes the data multiplexed by the multiplexer for error correction.
Owner:LG ELECTRONICS INC
Apparatus and method to electromagnetically shield portable consumer devices
InactiveUS7482925B2Prevent unauthorizedTicket-issuing apparatusUnauthorised/fraudulent call preventionEngineeringElectromagnetic shielding
An apparatus and method is provided to shield contactless portable electronic consumer devices such as radio frequency identification devices (RFID), tokens, mini-cards, key fobs, cellular phones, smartcards, etc. from wireless interrogation. In one embodiment, a contactless portable consumer device which includes a first antenna is shielded from unauthorized wireless interrogation with a radio frequency (RF) shield. The RF shield includes electrically conductive, non-ferromagnetic material and is configured to prevent unauthorized data transfer between a second antenna external to the portable consumer device and the first antenna.
Owner:VISA USA INC (US)
Adaptive modulation and coding
ActiveUS7103325B1Spatial transmit diversityPolarisation/directional diversitySpace time transmit diversityTransmission channel
The present invention selects a space-time encoding mode to use when transmitting with spatial diversity based on the receive diversity associated with a receiver device and the quality of the transmission channels based on information fed back from the receiver device. The selectable space-time encoding modes are preferably space-time transmit diversity encoding and a version of BLAST-type encoding. Further, modulation modes, error encoding rates, or a combination thereof, may also be based on the quality of the transmission channels and the available diversity of the receiver device.
Owner:APPLE INC
Receiver for robust data extension for 8VSB signaling
InactiveUS7194047B2Robust of serviceImprove performanceData representation error detection/correctionBroadcast specific applicationsDigital televisionCarrier recovery
A robust data extension, added to a standard 8VSB digital television signal, is used to improve the performance of a digital television receiver. Robust data packets are encoded at a 1 / 3-trellis rate as compared to normal data packets that are encoded at a 2 / 3-trellis rate. In addition to delivery of robust data for mobile applications, the redundant robust data packets also improve the performance of the receiver in the normal tier of service. In particular, the robust data packets improve the performance of the receiver equalizer filter in the presence of rapidly changing transient channel conditions such as dynamic multipath for both robust data packets and normal data packets. The robust data packets improve the performance of the carrier recovery loop and the symbol timing recovery loop. Backward compatibility with existing receivers is maintained for 1) 8VSB signaling, 2) trellis encoding and decoding, 3) Reed Solomon encoding and decoding, and 4) MPEG compatibility.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
RF power transmission, modulation, and amplification embodiments
InactiveUS20070096806A1Amplifier modifications to reduce non-linear distortionResonant long antennasEngineeringFrequency characteristic
Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and / or frequency characteristics of one or more of the signals are controlled to provide the desired phase, frequency, and / or amplitude characteristics of the desired time-varying complex envelope signal. In another embodiment, a time-varying complex envelope signal is decomposed into a plurality of constant envelope constituent signals. The constituent signals are amplified equally or substantially equally, and then summed to construct an amplified version of the original time-varying envelope signal. Embodiments also perform frequency up-conversion.
Owner:PARKER VISION INC
Wireless communication over a transducer device
InactiveUS20070082611A1Small sizeReduce weightCordless telephonesSubstation speech amplifiersElectricityTransducer
Owner:FREELINC HLDG LLC
System and method for current-mode amplitude modulation
InactiveUS20050032488A1Efficient and linear amplificationHighly linear envelope modulationSimultaneous amplitude and angle modulationAmplifier modifications to reduce non-linear distortionAntenna impedanceAudio power amplifier
An amplifier circuit includes a power amplifier biased for saturated mode operation, and a controllable current source to provide supply current to the power amplifier. The controllable current source effects desired amplitude modulation of the output signal from the power amplifier by modulating the supply current it provides responsive to an amplitude information signal. In one or more embodiments, the current source includes a circuit that is configured to adjust one or more transmitter operating parameters responsive to detecting changes in the effective DC resistance of the power amplifier. For example, the circuit may generate a compensation signal that reduces the effective DC resistance responsive to detecting that the effective DC resistance has undesirably increased. By way of non-limiting examples, such compensation may be effected by changing a current mirror, an amplifier-to-antenna impedance matching, an amplifier bias or device size, or imposing some form of transmit signal back-off.
Owner:ERICSSON INC
Power control loop using a tunable antenna matching circuit
ActiveUS8320850B1Avoid instabilityAvoid interactionPower managementMultiple-port networksAntenna matchingRF power amplifier
The present disclosure relates to combining tunable antenna matching circuit adjustments and RF power amplifier output power adjustments of a first RF terminal in response to output power adjustment commands received from a second RF terminal. The output power adjustment commands may be part of an output power control loop between the first RF terminal and the second RF terminal to control the output power from the first RF terminal. The first RF terminal may include an RF receiver, an RF power amplifier, and a tunable antenna matching circuit coupled between an output of the RF power amplifier and an antenna. The tunable antenna matching circuit adjustments may be impedance adjustments of the tunable antenna matching circuit and the RF power amplifier output power adjustments may result from adjustments to one or more input signals to the RF power amplifier.
Owner:QORVO US INC
Reconfigurable transmitter with direct digital to RF modulator
InactiveUS20050191976A1Analogue/digital conversionResonant long antennasAudio power amplifierData signal
An RF transmitter uses two digital-to-RF conversion modules to convert digital baseband signals into RF signals. In Cartesian mode, baseband signals are conveyed to the conversion modules for RF conversion. In polar mode, baseband signals are converted into amplitude and phase data parts. Phase data part is converted into I and Q data parts to be converted by the conversion modules into RF signals, which are modulated in a power amplifier by amplitude data part through the power supply of the power amplifier. Each digital-to-RF module uses parallel unit cells to perform D / A conversion function and upconversion function by an IF signal. Each unit cell, adapted to receive a control voltage indicative of a data signal value, is a mixer cell type converter having a differential data switch section connected in series to a differential LO-switch pair. LO-switch is further connected in series to a current source.
Owner:NOKIA TECHNOLOGLES OY
Method and system for a wideband polar transmitter
InactiveUS8036308B2Modulation with suppressed carrierAmplitude-modulated carrier systemsWireless communication protocolIntermediate frequency
Certain aspects of a method and system for a wideband polar transmitter may be disclosed. Aspects of the method may include polar modulating a plurality of signals by generating a plurality of modulated intermediate frequency (IF) signals corresponding to each of a plurality of wireless communication protocols within a transmitter that handles the plurality of wireless communication protocols. The generated plurality of modulated IF signals may be upconverted to a plurality of radio frequency (RF) signals. The plurality of RF signals may be combined and the combined plurality of RF signals may be amplitude modulated.
Owner:AVAGO TECH INT SALES PTE LTD
Impedance control apparatus and method for portable mobile communication terminal
ActiveUS20090109880A1Impedance mismatchingTransmission control/equalisingModulation with suppressed carrierImpedance matchingImpedance control
An impedance control apparatus and method for portable mobile communication terminal is disclosed capable of accurately adjusting impedances relative to environment when the portable mobile communication terminal is being used, wherein an impedance of a first variable impedance matching part is varied to receive a reception impedance correction signal transmitted by a base station and to detect a reception strength, an impedance of the first variable impedance matching part is set by a impedance value of the largest reception strength out of the reception strengths, the portable mobile communication terminal varies the impedance of a second variable impedance matching part to transmit a transmission impedance correction signal to a base station and to allow the base station to detect the reception strength, and the impedance setting of the second variable impedance matching part is performed using the reception strength detected by the base station.
Owner:LG ELECTRONICS INC
Digital VSB transmission system
InactiveUS6980603B2Noise robustData representation error detection/correctionCode conversionNoise levelComputer science
A digital VSB transmission system in disclosed. The system is compatible with the existing ATSC 8T-VSB receiver and able to transmit additional supplemental data as well as MPEG image / sound data. It initially encodes the information bit of the supplemental data with a ½ encoding rate in order to produce a parity bit and sends the parity bit together with the information bit. Therefore, both of the MPEG image / sound data and the supplemental data can be transmitted properly even through a channel having a high ghost and / or noise level. Particularly, it can significantly improve performances of the slicer predictor and trellis decoder of the VSB receiver.
Owner:LG ELECTRONICS INC
Techniques for multi-wire encoding with an embedded clock
ActiveUS8649460B2Simultaneous amplitude and angle modulationModulation with suppressed carrierComputer moduleComputer science
Techniques for multi-wire encoding with an embedded clock are disclosed. In one particular exemplary embodiment, the techniques may be realized as a transmitter component. The transmitter component may comprise at least one encoder module to generate a set of symbols, each symbol being represented by a combination of signal levels on a set of wires. The transmitter component may also comprise at least one signaling module to transmit one or more of the symbols over the set of wires according to a transmit clock. The transmitter component may additionally comprise control logic to restrict transmission of first and second subsets of the set of symbols to respective first and second portions of a clock cycle of the transmit clock, such that a signal differential among at least two of the set of wires exhibits a switching behavior that has a same frequency as the transmit clock.
Owner:RAMBUS INC
Manufacture of LPRF device wake up using wireless tag
InactiveUS20050093702A1High sensitivityIncrease rangeSpecial service provision for substationPosition fixationElectricityTransceiver
A method is disclosed for manufacturing a wireless transceiver (5008) having a low power radio frequency (LPRF) component (5010) that powers down to conserve energy and powers up in response to a signal; and a second receiver (5014) that provides the signal via line (5018) in response to receipt of a radio frequency broadcast. The broadcast is targeted to activate particular transceivers by including in the broadcast identifications such as class designations, in which case the transceivers power up and form networks. A transceiver may include one or more identifications and may include a unique identification of the transceiver itself. The LPRF component is a Bluetooth radio, but the overall transceiver itself only draws about 10 to 15 μA while actively awaiting and screening for a targeted broadcast.
Owner:GOOGLE LLC
Miniature sub-resonant multi-band vhf-uhf antenna
InactiveUS20080305750A1Low costSmall sizeAntenna supports/mountingsModulation with suppressed carrierMulti bandAntenna design
A novel antenna system for receiving transmissions in the VHF and UHF frequency bands particularly suitable as a miniaturized antenna for UHF reception, such as of digital video broadcasting transmissions. The antenna system utilizes a combination of three techniques including (1) the use of dialect loading using a high dielectric constant ceramic substrate; (2) an antenna dielectrically loaded and tuned to a significantly higher frequency than desired; and (3) use of a tuning circuit to compensate for the frequency offset of the antenna thereby shifting the resonant frequency to cover the entire band. The antenna is intentionally designed to be too small to radiate at the frequency of interest. The antenna element is then ‘forced’ to be tuned to the desired lower frequency using passive (or active) reactive components as part of a tuning circuit. Multi-band operation is achieved by providing a bypass switch to connect the antenna element either to (1) a first receiver without the tuning circuit (i.e. high frequency tuning) or (2) a second receiver with the tuning circuit (i.e. low frequency tuning).
Owner:VISHAY INTERTECHNOLOGY INC
Digital broadcasting transmission and reception devices and methods thereof
ActiveUS20060285608A1Improve reception performanceError correction/detection using trellis codingModulation with suppressed carrierBroadcast transmissionDigital broadcasting
Digital broadcasting transmission and reception devices and methods thereof are provided. The digital broadcasting transmission device includes a randomizer which randomizes a dual transport stream including a normal stream and a robust stream, a supplementary reference signal inserter which inserts a certain supplementary reference signal into a stuffing region included in the randomized dual transport stream, a Reed-Solomon (RS) encoder which adds a parity into a parity region included in the dual transport stream, a robust processor which configures a new dual transport stream by convolution-encoding the robust stream among the dual transport stream, an interleaver which interleaves the configured dual transport stream, a trellis encoder which trellis-encode the interleaved dual transport stream, and a modulator which transmits the trellis-encoded dual transport stream. Accordingly, a sub-channel can be provided in which the robust data and the supplementary reference signal will be transmitted.
Owner:SAMSUNG ELECTRONICS CO LTD
Modulation circuit device, modulation method and radio communication device
ActiveUS20050008093A1Simultaneous amplitude and angle modulationAmplifier modifications to reduce noise influenceWaveform shapingAngle modulation
The amplitude modulator comprises: an angle modulator for angle-modulating a phase signal to be inputted; a waveform shaping means in which, (1) when the magnitude of an amplitude signal to be inputted becomes smaller than a first prescribed value, a waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes small becomes the first prescribed value; and / or (2) the waveform shaping means in which, when the magnitude of the amplitude signal to be inputted becomes larger than the second prescribed value which is larger than the first prescribed value, the waveform of the amplitude signal is shaped so that the magnitude of the amplitude signal of the portion which becomes larger becomes the second prescribed value; and an amplitude modulator for amplitude modulating the signal of the output of the angle modulator by the signal of the output of the waveform shaping means.
Owner:PANASONIC CORP
Method of and apparatus for transmitting digital broadcasting signal in advanced-vsb (a-vsb) system in which transport packet without adaptation field is provided at fixed location in data field slices
A method of processing a digital broadcasting signal includes generating a transport stream including a plurality of transport packets; selecting one of the transport packets as a starting packet to be mapped into a first data segment of an encoded data frame; and constructing deterministic data frames in the transport stream beginning with the starting packet; wherein at least one of the 52 transport packets does not have an adaptation field; wherein all remaining ones of the 52 transport packets do have an adaptation field; and wherein the at least one transport packet that does not have an adaptation field is provided at a fixed location in each of the slices.
Owner:SAMSUNG ELECTRONICS CO LTD
Digital VSB transmission system
InactiveUS7092455B2Improve robustnessGreat encoding gainPulse modulation television signal transmissionModulation with suppressed carrierTransfer systemSupplementary data
A digital VSB transmission system that is able to send supplemental data along with MPEG image / sound data is enclosed. The system initially encodes the supplemental data symbol to generate a parity bit, and it multiplexes the parity bit with a predefined sequence and transmits the multiplexed data to a receiver. The system is compatible with the existing ATSC 8T-VSB receivers that are already on the market. It can have advantages over the other type of VSB transmission systems that transmit only the predefined sequence. In addition, the system according the to the present invention results a improved robustness against ghost and noise signals in a channel compared to systems using only the ½ rate convolutional encoding.
Owner:LG ELECTRONICS INC
Communications signal amplifiers having independent power control and amplitude modulation
InactiveUS7010276B2Improve efficiencyResonant long antennasPower amplifiersAudio power amplifierCarrier signal
The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelope carrier signal. The modified constant-envelope carrier signal is amplified in response to an amplitude modulation signal to produce a communications signal having amplitude modulation and having an average output power proportional to a signal level of the modified constant-envelope carrier signal. This manner of operation allows wide dynamic range of average output power to be achieved. Because amplitude modulation is applied after amplitude varying circuitry used to produce the modified constant-envelope carrier signal, the amplitude modulation is unaffected by possible non-linearities of such circuitry. In accordance with another aspect of the invention, operation in the foregoing manner at comparatively low average output power levels is combined with switch mode operation at comparatively high average output power levels, enabling high overall efficiency to be achieved. Hence, the disclosed modulator and amplifier combination, in addition to supporting very low power signals, also supports high power signals.
Owner:INTEL CORP
Transmitting arrangement and method for impedance matching
ActiveUS20070085609A1Impedence matching networksModulation with suppressed carrierImpedance matchingReference circuit
A transmitting arrangement includes a matching circuit, a reference circuit and a comparator. The output of the matching circuit can be coupled to an antenna and comprises an adjustable impedance. The reference circuit is connected to an input of the matching circuit and comprises a reference impedance. Inputs of the comparator are coupled to the matching circuit and the reference circuit and its output is coupled to the adjustable impedance via a control input of the matching circuit.
Owner:INTEL CORP
Communication system in digital television
InactiveUS7085324B2Robust to ghostNoise robustPicture reproducers using cathode ray tubesModulation with suppressed carrierMultiplexingCommunications system
Owner:LG ELECTRONICS INC
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