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260 results about "Analog transmission" patented technology
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Analog transmission is a transmission method of conveying information using a continuous signal which varies in amplitude, phase, or some other property in proportion to that information. It could be the transfer of an analog source signal, using an analog modulation method such as frequency modulation (FM) or amplitude modulation (AM), or no modulation at all.
Super-large-effective-area (SLA) optical fiber and communication system incorporating the same
ActiveUS6904218B2Increase the effective areaLow cutoff wavelengthOptical fibre with multilayer core/claddingOptical waveguide light guideFiberUltrasound attenuation
A super-large-effective-area (SLA) optical fiber that is suitable for communicating over a wide wavelength range and that, because of its large effective area, suppresses nonlinear effects that typically result from interaction between signal channels. The effective area, Aeff, of the SLA fiber of the present invention preferably is equal to or greater than approximately 80 μm2 at a wavelength window around 1310 nm. The cutoff wavelength of the SLA fiber of the present invention preferably is less than 1310 nm. Thus, the SLA fiber of the present invention has a very large effective area and a very low cutoff wavelength. In accordance with the present invention, a variety of SLA fibers are provided that all have very large effective areas and desirable transmission properties. The large effective areas of the SLA fibers of the present invention enable nonlinear effects to be suppressed, as well as Stimulated Brillouin Scattering in analog transmission. The large effective areas also enable attenuation to be reduced. The result of suppressing nonlinear effects and reducing attenuation enable signals to be transmitted over long distances and over a broad bandwidth.
Owner:FURAKAWA ELECTRIC NORTH AMERICA INC
Dynamic signature creation and enforcement
Owner:FIREEYE SECURITY HLDG US LLC
Dynamic signature creation and enforcement
ActiveUS20120331553A1Memory loss protectionDigital data processing detailsNetwork dataDigital device
A dynamic signature creation and enforcement system can comprise a tap configured to copy network data from a communication network, and a controller coupled to the tap. The controller is configured to receive the copy of the network data from the tap, analyze the copy of the network data with a heuristic to determine if the network data is suspicious, flag the network data as suspicious based on the heuristic determination, simulate transmission of the network data to a destination device to identify unauthorized activity, generate an unauthorized activity signature based on the identification, and transmit the unauthorized activity signature to a digital device configured to enforce the unauthorized activity signature.
Owner:FIREEYE SECURITY HLDG US LLC
System and method for providing an electronic program guide of live and cached radio programs accessible to a mobile device
An electronic program guide for the radio (radio EPG) depicts radio programs available via the Internet or analog transmission. The radio EPG displays the programming available for a plurality of radio stations and time slots. The radio EPG is interactive in that a user may select a radio program for immediate playback or future recording. Radio programs are continuously received and cached by the Internet-enabled television system such that a user may be able to select and listen to an earlier-broadcast radio program listed in the radio EPG. The EPG is broadcast using a wireless technology so that mobile devices such as cellular phones, webpads, personal desktop assistants (PDA's), personal stereos, car stereos, and laptop computers with wireless network connections can receive and display the EPG.
Owner:ARRIS ENTERPRISES LLC
System and method for multi-path simulation
InactiveUS20050059355A1Reduced strengthReliable resultsTransmission monitoringMobile antennasDirect path
The present invention provides a system and method for multi-path simulation that employs a shielded anechoic chamber to avoid external electromagnetic interference and other uncontrollable transmission paths during testing, and simulates a main indirect transmission path by a reflector within the chamber. An attenuating device is used to attenuate signals, thereby simulating the signal attenuation during transmission. The shielded anechoic chamber also includes a movable platform and a turntable, both controlled by a control unit, for carrying a dipole antenna and a wireless communication device to be tested respectively. The movable platform is used to shift the antenna, thereby simulating the phase shift between a direct path and a main indirect path of the system; the turntable is used to change the reception azimuth of the communication device, thereby measuring the performance of the device in various azimuth angles.
Owner:ACCTON TECHNOLOGY CORPORATION
System and method for generating analog transmission signals
InactiveUS7076170B2Overcomes drawbackImprove dynamic rangeLaser detailsCoupling light guidesLow noiseDiscriminator
An RF-lightwave transmitter performs successive conversions of an information-bearing input signal in order to generate an output signal suitable for transmission in a wireless communications system. The transmitter includes a high-efficiency FM laser connected to a FM discriminator. In operation, the laser converts an RF signal into a frequency-modulated optical signal, and the discriminator converts this signal into an amplitude-modulated optical signal. The discriminator performs its conversion using a high slope-efficiency linear transfer function which ensures that the AM optical signal varies in accordance with a desired operational performance. The transmitter also includes a photodiode which converts the AM signal output from the optical discriminator back into an RF signal for transmission. Experimental results demonstrated that a transmitter of this type is able to realize greater than 10 dB RF insertion gain at less than 0 dBm optical power, with a high spurious-free dynamic range and low noise. A signal processor embodied within the transmitter may be used in a purely optical communication systems or may be used for other types of RF-photonics applications such as those expected for use in next-generation systems.
Owner:UNIV OF MARYLAND BALTIMORE COUNTY
Method and apparatus for determining analog beam in hybrid beam-forming system
InactiveUS20130039445A1Reduce the amount requiredModulated-carrier systemsRadio transmissionEngineeringElectrical and Electronics engineering
A method and an apparatus determine an analog beam in a digital / analog hybrid beam-forming system. In a method of a reception end, for determining an analog beam in a hybrid beam-forming system, channel information regarding a transmission end is measured. At least one of an analog transmission beam-forming vector and a reception beam-forming vector is determined depending on the measured channel and a digital beam-forming technique in use. Information of the determined transmission beam-forming vector is fed back to the transmission end.
Owner:SAMSUNG ELECTRONICS CO LTD
Radio relay apparatus and operating method therefor
ActiveUS20200204249A1Reduce establishment timeLow costSynchronisation arrangementWavelength-division multiplex systemsIntermediate frequencyRadio frequency signal
A radio relay apparatus and an operating method therefor are provided.The radio relay apparatus that relays a communication signal between a base station and a terminal includes a donor unit that transmits and receives a radio frequency signal to and from the base station, and at least one service unit that transmits and receives an analog transmission signal to and from the donor unit, and transmits and receives the radio frequency signal to and from the terminal. In the analog transmission signal, an intermediate frequency signal into which the radio frequency signal is converted and a time synchronization signal extracted from the intermediate frequency signal are combined. The time synchronization signal is used by the donor unit and the at least one service unit for time division duplex communication (TDD) synchronization control.
Owner:KT CORP
System and method for transmitting and storing data using an enhanced encoding scheme
A system for and method of transmitting and storing data using multidecimal encoding. A binary data stream is encoded into a multidecimal data stream. Distinct frequencies are then assigned to characters in the multidecimal data stream for transmitting the multidecimal character information. Individual frequencies, or combinations of frequencies, may be assigned to each multidecimal character to be transmitted, through various methods. The various multidecimal transmission schemes described herein may be employed in any of several transmission systems, such as fiber optics networks, analog transmission systems, DSL systems, cable modem systems, wireless communication systems, or any other suitable data transmission systems. Multidecimal data may also be stored in various storage media, such as CD-ROMs, DVDs, or RAM.
Owner:LARSON MYKEL G
Transmission device and transmission method
InactiveUS6980604B2Eliminate phase differenceReliable compensationAmplifier modifications to reduce non-linear distortionEqualisersAudio power amplifierDigital input
The present invention provides a transmission device for predistorting a digital signal in order to compensate distortion, then amplifying and transmitting it. A digital input signal is converted to a first analog signal by a first D / A converter. Separately, the digital input signal is also subjected to predistortion. A compensating signal is then generated from the digital input signal and the predistorted signal. The compensating signal generated thereby is converted into a second analog signal by a second D / A converter. The first analog signal and second analog signal are then added, this addition operation giving a compensated analog transmission signal. This analog transmission signal is supplied to the amplifier for amplification, and then transmitted via an antenna.
Owner:FUJITSU LTD
Radio integrated circuit with integrated power amplifier
InactiveUS20060128347A1Increase power consumptionMinimizes digital signal processingTransmission control/equalisingDigital dataDigital signal processing
A radio system includes a radio frequency (RF) integrated circuit (IC), a baseband digital signal processing (DSP) IC, and a serial digital interface coupling data there-between. In one embodiment of the invention, the RF IC has an input receiver to receive a serial digital transmission bit stream from a digital signal processing integrated circuit; a data recoverer coupled to the input receiver to recover digital data bits from the serial digital transmission bit stream; a low pass filter coupled to the data recoverer convert the digital data bits into an analog transmission signal; a mixer coupled to the low pass filter to up-convert the analog transmission signal from a baseband frequency to a second selectable carrier frequency as a transmit radio frequency signal; and an amplifier coupled to the mixer and an antenna, the amplifier to amplify the transmit radio frequency signal for broadcast over the antenna.
Owner:MAXIM INTEGRATED PROD INC
Transmission device and transmission method
InactiveUS20020097811A1Quick conversionReliable compensationAmplifier modifications to reduce non-linear distortionEqualisersAudio power amplifierDigital input
The present invention provides a transmission device for predistorting a digital signal in order to compensate distortion, then amplifying and transmitting it. A digital input signal is converted to a first analog signal by a first D / A converter. Separately, the digital input signal is also subjected to predistortion. A compensating signal is then generated from the digital input signal and the predistorted signal. The compensating signal generated thereby is converted into a second analog signal by a second D / A converter. The first analog signal and second analog signal are then added, this addition operation giving a compensated analog transmission signal. This analog transmission signal is supplied to the amplifier for amplification, and then transmitted via an antenna.
Owner:FUJITSU LTD
Wireless communication apparatus
InactiveUS20070223608A1Suitable for communicationSuitable performanceError preventionLine-faulsts/interference reductionIntermediate frequencyCarrier signal
A wireless communication apparatus utilizing an orthogonal frequency division multiplexing communication method includes an antenna transmitting and receives a radio-frequency signal; a receiver frequency converter frequency-converting the radio-frequency signal into a baseband signal in accordance with a low-intermediate frequency method; an analog-to-digital converter converting the baseband signal into a digital signal; an orthogonal frequency division multiplexing demodulator acquiring a plurality of subcarriers in a frequency domain; a data reproduction unit reproducing data; a transmission data generator generating transmission data; an orthogonal frequency division multiplexing modulator performing orthogonal frequency division multiplexing modulation of the plurality of subcarriers; a digital-to-analog converter converting the digital orthogonal frequency division multiplexing signal into an analog signal; and a transmitter frequency converter converting the analog transmission baseband signal into a transmission radio-frequency signal in accordance with a zero-intermediate frequency method.
Owner:SONY CORP
High speed analog envelope detector
ActiveUS7557633B2Simplifies the circuit architectureMultiple input and output pulse circuitsData switching detailsVoltage referenceData detection
A high speed analog transmission envelope (data-validity) detector for detecting the validity or invalidity of received data by generating (and comparing) first through fourth level-shifted signals based on a pair of differential input signals that are externally applied (received). Each of the first through fourth level-shifted signals has voltage levels different from (e.g., higher than) the differential input signals. After comparing the first through fourth level-shifted signals with each other, the comparison results are used in determining the validity of the differential input signals (data). The analog transmission envelope (data) detector flexibly adapts to variations in common mode voltage, and simplifies the circuit architecture because it does not require an additional reference voltage for determining the validity of received data.
Owner:SAMSUNG ELECTRONICS CO LTD
System and method for analyzing response values sum of differential signals
ActiveUS20080010622A1Analogue computers for electric apparatusDetecting faulty computer hardwareDifferential signalingFourier transform on finite groups
Owner:CLOUD NETWORK TECH SINGAPORE PTE LTD +1
Monolithic semiconductor light source with spectral controllability
InactiveUS20050201675A1Induce Raman amplification of optical signalIncrease powerCoupling light guidesActive medium shape and constructionBroadbandAmplified spontaneous emission
The invention is in the field of distributed Raman amplification for digital and analog transmission applications and other applications, e.g., instrumentation and imaging applications, including HFC-CATV applications. In particular, the invention uses a high power broadband source of amplified spontaneous emission (ASE) as the Raman pump source for improved system performance. The invention also includes methods for constructing such a high-power broadband Raman pump.
Owner:AHURA CORP
Radio communication method, radio communication system, and radio transmission apparatus
ActiveUS20100215080A1Flexible communicationMinimize degradationModulated-carrier systemsActive radio relay systemsCommunications systemData sequences
A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section; a parallel / serial conversion section that converts output from the GI inserting section into a serial data sequence; a digital / analog conversion section; and an RF section that transmits a signal from an antenna after converting the signal to a frequency band for analog signal transmission and controlling it to an appropriate transmission power. The control section is configured to generate control information A for determining the variable SF and input the information A to the variable-SF spreading section and the RF section. In control information A, SF is varied depending on transmission power required.
Owner:SHARP KK
Pre-emphasis and de-emphasis emulation and wave shaping using a programmable delay without using a clock
An adjustable-delay filter performs wave shaping to emulate pre-emphasis or de-emphasis of transmission-line signals. The adjustable-delay filter uses analog components and does not need a clock. The receiver does not have to recover a bit-clock from the data stream, eliminating a clock recovery circuit. An input buffer receives the input signal and drives current to a summer and to an adjustable delay. The adjustable delay inverts and delays the current and drives a delayed, inverted current to the summer. The summer combines the delayed, inverted current and the current from the input buffer to generate an output signal. The delay time of the adjustable delay can be programmed by a user and is less than the bit period. After a signal transition, the output signal initially spikes higher, then falls back to a nominal level after the delay time has expired. The initial signal spike emulates de-emphasis or pre-emphasis.
Owner:DIODES INC
Wireless channel realtime simulator and simulation method oriented to deep space communication
Disclosed are a wireless channel realtime simulator and a simulation method oriented to deep space communication. The wireless channel realtime simulator and the simulation method are supportive of realtime duplex communication channel simulation of an uplink and a downlink. The wireless channel realtime simulator comprises a main control unit, a baseband signal channel simulation unit, a frequency changer unit and an attenuator unit, the main control unit is in data and order transmission with the baseband signal channel simulation unit, the frequency changer unit and the attenuator unit through a CPCI bus, and the baseband channel simulation unit, the frequency changer unit and the attenuator unit are in analog signal transmission through an SMA interface. By combining the wireless channel realtime simulator with the simulator method, transmission conditions of wireless signals under a deep space background can be effectively simulated in real time, and debugging, testing and performance evaluating of deep space communication equipment are realized in a ground laboratory.
Owner:NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Method and device for the representing an object by means of an irradiation and for reconstructing said object
InactiveUS20040066908A1Reconstruction from projectionMaterial analysis using wave/particle radiationObject basedData preparation
The invention is based on the knowledge that a representation of an object can be improved via a transmission with regard to a subsequent reconstruction of the object based on the representation, by using simulated data, which correspond to a simulated transmission of the object already prior to a reconstruction as advance information for measuring a transmission of the object and / or for generating the representation from a measured transmission. An inventive method for the representation of an object via a transmission comprises providing simulated data, which correspond to a simulated transmission of the object, for example in a memory, and using the simulated data for measuring a transmission of the object, for example in a computertomograph, to obtain the transmission of the object, by a control and / or using the simulated data for generating the representation from a measured transmission by a data preparation means.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV
Monolithic semiconductor light source with spectral controllability
InactiveUS7190861B2Coupling light guidesElectromagnetic transmissionBroadbandAmplified spontaneous emission
The invention is in the field of distributed Raman amplification for digital and analog transmission applications and other applications, e.g., instrumentation and imaging applications, including HFC-CATV applications. In particular, the invention uses a high power broadband source of amplified spontaneous emission (ASE) as the Raman pump source for improved system performance. The invention also includes methods for constructing such a high-power broadband Raman pump.
Owner:AHURA CORP
System for amplifying optical signals
InactiveUS7215836B2Laser using scattering effectsLaser optical resonator constructionBroadbandAmplified spontaneous emission
The invention is in the field of distributed Raman amplification for digital and analog transmission applications and other applications, e.g., instrumentation and imaging applications, including HFC-CATV applications. In particular, the invention uses a high power broadband source of amplified spontaneous emission (ASE) as the Raman pump source for improved system performance. The invention also includes methods for constructing such a high-power broadband Raman pump.
Owner:AHURA CORP
Neural networks
InactiveUS20040181497A1Reduce in quantityReduce download timeMultiple modulation transmitter/receiver arrangementsDigital computer detailsCommunications systemTransfer mode
A communications system comprising a plurality of terminals each having a neural network therein which has parameter values enabling the network to emulate a transmission processing stage in a transmission mode, and a transmission station for sending new parameter values to the terminals to change the operation of the neural networks to emulate a new transmission mode.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and system for adaptive modeling and simulation of lossy transmission lines
InactiveUS8386216B1Efficient and accurate results in frequency dependent environmentComputation using non-denominational number representationComputer aided designLossy transmission linesModeling and simulation
A method and system are provided for adaptively modeling and simulating high speed response of a transmission line. A simulation unit maintains a plurality of curve approximation options for modeling the transmission line. The suitability of a predefined primary one of the curve approximation options for modeling is determined based on frequency-domain modal scattering parameters obtained according to frequency-dependent data characterizing the transmission line. One of the options is selectively executed in response to the determination, in order to generate a macromodel of the transmission line. The primary option is executed upon determination of suitability, while a secondary one of the curve approximation options is alternatively executed upon determination of non-suitability. Transient simulation is then executed upon the resulting macromodel of the transmission line.
Owner:CADENCE DESIGN SYST INC
Monitoring alarm system for locating position and image transmission
InactiveCN1447540ASolve the problem of image transmissionSolve quick callReceivers monitoringModem deviceImage transfer
A system includes the mobile terminals, the communication base stations, the monitoring center and global position satellite. The vehicle carried nevigation terminal in the mobile terminal is composed of the GPS antenna, the OEM receiving border, CPU, the storage for digital map, the interface for IC card, the display memry, the sequential control circuit, the and the IDEN handset interface circuit etc. The vehicle carried transmission terminal consists of the camera head, the image collection chip as well as the said sequential control circuit, CPU, the storage for images. The vehicle carried analog transmission terminal includes the GPS antenna, the OEM receiving border, CPU, the data storage, modem and the broadcasting station interface circuit.
Owner:郑桂一
Radio communication method, radio communication system, and radio transmission apparatus
InactiveUS20120213054A1Flexible communicationMinimize degradationModulated-carrier systemsActive radio relay systemsCommunications systemEngineering
A transmission apparatus according to the present invention includes: an encoding section; a modulation section; a variable-SF spreading section that performs spreading with variable SF according to control information A from a control section; an IDFT section that performs IDFT on output from the spreading section; a GI inserting section; a parallel / serial conversion section that converts output from the GI inserting section into a serial data sequence; a digital / analog conversion section; and an RF section that transmits a signal from an antenna after converting the signal to a frequency band for analog signal transmission and controlling it to an appropriate transmission power. The control section is configured to generate control information A for determining the variable SF and input the information A to the variable-SF spreading section and the RF section. In control information A, SF is varied depending on transmission power required.
Owner:SHARP KK
Rapid identification of transmission media channel characteristics
InactiveUS20020181567A1Compensates for and reduces effectReduce eliminate effectMultiple-port networksTwo-way loud-speaking telephone systemsCommunications systemMean square
Rapid identification and modeling of transmission media channel characteristics of a communications system using a correlation based technique. The technique provides a known training sequence used to generate a known quantity that operates on an observed or measured received signal, which is a function of the training sequence and the channel's impulse response, to give an estimate of the model of the channel. The technique decouples the training sequence from the observed or measured output, leaving the estimated impulse response. The impulse response of the transmission media channel is rapidly computed and processed to set the initial values of filter coefficients, for example, an echo canceller and an equalizer, in the communications system. Once the coefficients are initialized, if needed, a standard technique, such as least mean square (LMS) correlation, can be used to fine-tune the coefficients to converge on or model the transmission media channel's characteristics.
Owner:HEWLETT PACKARD DEV CO LP
Method for estimating the downlink capacity in a spread spectrum wireless communications system
ActiveUS7400887B2Radio/inductive link selection arrangementsWireless communicationInterference (communication)Communications system
Owner:ALCATEL-LUCENT USA INC +1
Method and system for network service quality measurement
The invention discloses a method and a system for measuring network service quality. The method comprises: a measurement server conforms a measurement policy according to a measurement demand and network data and node number, which includes: nodes involved in the measurement and measurement works to be finished; the measurement server separately transmits the measurement policy to each node involved in the measurement as a dispatching order form; the measurement content includes service quality measurement of a certain business; the nodes involved in the measurement finishes the measurement works based on the dispatching order, which comprises simulating the measurement data packs of an application layer protocol used by transmission between nodes, counting the service quality parameters between the nodes and reporting the parameters to the measurement server. The method for measuring network service quality can simulate the different processing modes of different businesses, and obtain an exact service quality situation of different businesses.
Owner:ZTE CORP
Radio communication device and signal processing method
ActiveUS20160020929A1High data resolutionNot easy to make mistakesCorrect operation testingModulation with suppressed carrierSignal onComputer science
A radio communication device comprises a processor configured to generate a transmission signal on the basis of data to be transmitted. The processor generates the transmission signal by a transmission scheme selected from a digital transmission scheme and an analog transmission scheme. The digital transmission scheme is a transmission scheme by which a bit stream obtained through binary encoding of the data to be transmitted is converted into the transmission signal. The analog transmission scheme is a transmission scheme by which the data to be transmitted directly is converted into the transmission signal without performing binary encoding of the data to be transmitted.
Owner:KYOCERA CORP
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