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Class 375/300 - Amplitude modulation


Subclass of Class 375 - Pulse or digital communications
Definition: Subject matter in which the pulses are multiplied with a
No. of patents: 176
Last issue date: 12/27/2011


1          
NumberTitleIssue Date
8085872Transmitting apparatus with bit arrangement method
A method of transmitting data that includes controlling generation of bit sequences to adjust an occupation rate occupied with predetermined bits included in a first data block, which is obtained by encoding first data in a first encoding process, to be equal or clo...
12/27/2011
8064540Amplitude modulator
A method for amplitude modulating a carrier signal according to one embodiment includes splitting the carrier signal into first and second paths; phase modulating the carrier signal on the first path; phase modulating the carrier signal on the second path; combining...
11/22/2011
8036308Method and system for a wideband polar transmitter
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 ...
10/11/2011
8027408ASK modulator
An ASK modulator for reducing the difference in the On/Off ratio due to the difference in the envelope frequency components without deteriorating an adjacent wave leakage power is disclosed. The ASK modulator includes a Manchester encoder that generates Manchester-e...
09/27/2011
8019017Method for receiving control information in orthogonal frequency division multiplexing system of mobile communication system
The present invention relates to receiving control information in an orthogonal frequency division multiplexing (OFDM) system of a mobile communication system. The present invention includes receiving information related to a number of OFDM symbols in a subframe for...
09/13/2011
7991076Complex signal scaling for phase and/or amplitude modulated signals
A signal scaling device (D), for a transmission path of a wireless communication equipment, comprises a processing means (PM) adapted to receive a phase and/or amplitude modulated signal (I/Q) to transmit, and arranged to multiply said phase and/or amplitude modulat...
08/02/2011
7991075Radio broadcasting method and transmitter using pre-filtering and corresponding signal
The disclosure relates to a radio broadcasting method for a first multicarrier digital signal occupying a first frequency band adjacent to at least one second frequency band, each assigned to a second signal. Pre-filtering is applied to the said first signal before ...
08/02/2011
7965792Modulation-index adjustable amplitude shift keying transmitter
Provided is a modulation-index adjustable amplitude shift keying (ASK) transmitter including: a bias current supply unit supplying one or more bias currents in response to a digital signal that is to be transmitted and one or more bias current control signals; and a...
06/21/2011
7949071Signal processing system and information storage medium
According to one embodiment, a first encoder encodes main information, a second encoder encodes sub-information, a first modulator modulates a carrier based on an output of the first encoder, a duplicating module duplicates an output of the second encoder to generat...
05/24/2011
7940859Transmission circuit and communication device
A transmission circuit is capable of precisely compensating for an offset characteristic of an amplitude modulation section, and operating with low distortion and high efficiency over a wide output electric power range. A signal generation section outputs an amplitu...
05/10/2011
7839953Transmission signal generating unit and radar transmission device using the same
A transmission signal generating unit has a window function calculator that generates a window function that makes all frequencies without a center frequency of an input signal and its adjacent frequencies zero and makes the signal to noise ratio of the center frequ...
11/23/2010
7773695Amplitude modulator
A circuit for amplitude modulating a carrier signal includes a carrier signal input, circuitry for splitting the carrier signal into first and second paths, circuitry for phase modulating the carrier signal on the first path, circuitry for phase modulating the carri...
08/10/2010
7733980Quadrature modulation circuits and systems supporting multiple modulation modes at gigabit data rates
A quadrature modulation circuit includes a mixer circuit including an integrated sign modulation control circuit and a plurality of mixer ports. The mixer ports include a first input port, a second input port, an output port and a sign modulation control port. The m...
06/08/2010
7706468Transmitter with forward error correction coding for hybrid AM in-band on-channel digital audio broadcasting systems
A transmitter for broadcasting an AM compatible digital audio broadcasting signal includes an analog modulator for producing an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by an an...
04/27/2010
7668256Method and apparatus for the generation and detection of optical differential varied-multilevel phase-shift keying with pulse amplitude modulation (ODVMPSK/PAM) signals
Methods and apparatus are described for generating and receiving amplitude and differential-phase encoded signals in which the number of phase states at a given amplitude level is always less than or equal to that at a higher amplitude level and at least two amplitu...
02/23/2010
7599448Multi-mode selectable modulation architecture calibration and power control apparatus, system, and method for radio frequency power amplifier
A control input signal to select a modulation architecture. When a first modulation architecture is selected based on the control input signal, a time varying and substantially known baseband bias control signal is applied to a bias input of a power amplification mo...
10/06/2009
7443924Residual carrier and side band processing system and method
In a communication device, the LO leakage and opposite side band signals are measured at an output signal. Input processing signals to a modulator are adjusted in response to the measured values to minimize the LO leakage and maximize side band suppression. ...
10/28/2008
7433653Transmitter and semiconductor integrated circuit for communication
A transmitter adopting a polar loop system including a phase control loop for controlling the phase of a carrier signal outputted from a transmitting oscillator and an amplitude control loop for controlling the amplitude of a transmitting output signal outputted fro...
10/07/2008
7421037Reconfigurable transmitter with direct digital to RF modulator
A radio frequency (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 conver...
09/02/2008
7395039Transmitter
In a transmitter of the present invention, a modulated signal is separated into an amplitude component and a phase component which are inputted to a radio-frequency modulated signal input terminal and a supply voltage terminal of a radio-frequency power amplifier. A...
07/01/2008
7395038High-efficiency modulating RF amplifier
The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such a manner as to achieve a desired modulation. In one embodiment, the spread between a maximum frequ...
07/01/2008
7369819Digital amplitude modulation transmitter with pulse width modulating RF drive
A digital amplitude modulation (AM) transmitter with pulse width modulating RF drive is presented. A plurality of RF amplifiers, each, when turned on, amplifies an applied RF drive signal by the same amount to provide a unit step RF output. An encoder supplies turn-...
05/06/2008
7366482Transmission device, transmission output control method, and radio communications device
Either linear operating mode or saturation operating mode is set as the operating mode of a high-frequency power amplifier on the basis of an operating mode set signal. The gain of a variable gain amplifier provided in front of the high-frequency power amplifier and...
04/29/2008
7362824Modulation method and radio communication system
An input digital signal is periodically and alternately subjected to first modulation and second modulation, being thereby converted into a pair of a baseband I signal and a baseband Q signal. The first modulation and the second modulation are different from each ot...
04/22/2008
7359685Transmitting stage
A transmission stage in polar loop technology includes an amplitude regulation means, a phase regulation means, a VCO and a feedback path. In the feedback path a variable amplifier is provided. The amplitude regulation means is further implemented in order to be con...
04/15/2008
7359448Remote transmitter system and method
A remote transmitter system for vehicle applications includes a remote transmitter for carrying by a user and a receiver for mounting on a vehicle and receiving an amplitude modulated signal. The transmitter is operative to transmit the amplitude modulated signal at...
04/15/2008
7359472Method and apparatus for wireless data transmission
A method and apparatus for wireless data transmission between a base station and one or more, in particular, passive and/or backscatter-based transponders, in which the base station modulates a carrier signal with a modulation signal, to generate synchronization mar...
04/15/2008
7358710Temperature-compensated inductor DCR dynamic current sensing
A resister network having a negative temperature coefficient (NTC) may be utilized to create a temperature compensated equivalent resistance “R” for a current sensing RC network used in measuring inductor current of a DC-to-DC converter or a general switching re...
04/15/2008
7359680Delay calibration in polar modulation transmitters
A method and apparatus for dynamically compensating for delay mismatch between a supply signal and an input signal of a power amplifier in polar modulation transmitters. One exemplary polar modulation transmitter according to the present invention comprises a power ...
04/15/2008
7356092Wireless communication system and communication semiconductor integrated circuit device
When a transmitting oscillator is built in a communication semiconductor integrated circuit device like a high-frequency IC constituting a wireless communication system, the system prevents degradation of the accuracy of control on the output power of a power amplif...
04/08/2008
7356315Outphasing modulators and methods of outphasing modulation
In one exemplary embodiment of the invention, an outphasing modulator may include at least a multiplier to multiply an amplitude modulation signal by a phase modulated carrier signal to generate a modulated signal. The outphasing modulator may also include a phase s...
04/08/2008
7346124Wideband quadrature generation technique requiring only narrowband components and method thereof
A method for reference signal generating in an ultra wideband (UWB) communication system which sends out and receives data by using at least two reference signals of predetermined frequencies. A first signal group, which comprises a local oscillation (LO) signal and...
03/18/2008
7343138Compensating for load pull in electromagentic signal propagation using adaptive impedance matching
The invention relates to for processing an electromagnetic input signal, wherein the signal is passed through an input to be modified across a plurality of modifying segments using a characteristic of the signal, and wherein the plurality of segments have a pluralit...
03/11/2008
7340012Single and multiple sinewave modulation and demodulation techniques employing carrier-zero and carrier-peak data-word start and stop
A method for detecting encoded digital data from a substantially sinusoidal waveform, the encoded digital data having one of a first value and a second value at selected phase angles θn comprises generating the waveform having an amplitude Y defined by a...
03/04/2008
7340010Forward error correction coding for hybrid AM in-band on-channel digital audio broadcasting systems
An AM compatible digital audio broadcasting signal comprises an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by an analog signal, and a plurality of digitally modulated subcarrier s...
03/04/2008
7336127Doherty amplifier configuration for a collector controlled power amplifier
An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty...
02/26/2008
7333780Polar modulation transmission apparatus and radio communication apparatus
A polar modulation transmission apparatus is provided which can adjust synchronization between an amplitude signal and phase signal in a simple configuration accurately and automatically. A polar signal generation circuit 101 sends an amplitude signal and pha...
02/19/2008
7330706Method and system for power control in radio transmitters
A method and system are provided for power control in radio transceivers wherein an amplifier amplifies a signal including data bursts. A signal corresponding to the amplified signal is compared with a reference value and if the result of the comparison shows that t...
02/12/2008
7330071High efficiency radio frequency power amplifier having an extended dynamic range
A system and method are provided for efficiently amplifying a radio frequency signal. In general, the system includes power amplifier circuitry that efficiently amplifies an input signal under power back-off conditions. In one embodiment, the power amplifier circuit...
02/12/2008
7324787Method of ramping up output level of power amplifier of radio communication system, communication semiconductor integrated circuit, and radio communication system
In a radio communication system having a phase control loop for phase modulation and an amplitude control loop for amplitude modulation and being capable of time divisional transmission and reception under a predetermined time management, when transmission in a firs...
01/29/2008
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