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Class Information
Number: 375/296
Name: Pulse or digital communications > Transmitters > Antinoise or distortion (includes predistortion)
Description: Systems where any undesired modulation components accompanying a desired modulated carrier wave signal, which components are due to electrical disturbances within the useful frequency band or any undesired carrier wave distortion and which may originate at a source external to the transmitter or which may be generated internally in the transmitter, are reduced, eliminated or compensated for, or where the transmitted signal may, prior to transmission, be distorted in a manner complementary to the distortion introduced in the transmission medium.










Sub-classes under this class:

Class Number Class Name Patents
375/297 Power amplifier 1,088


Patents under this class:
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Patent Number Title Of Patent Date Issued
7894547 In-phase and quadrature-phase signal amplitude and phase calibration Feb. 22, 2011
7894546 Replica linearized power amplifier Feb. 22, 2011
7890980 Method for receiving broadcasting signal and broadcasting receiver Feb. 15, 2011
7889810 Method and apparatus for a nonlinear feedback control system Feb. 15, 2011
7889798 PAR reduction for EDGE clipper Feb. 15, 2011
7885352 Method and device for determining transmit power spectral density Feb. 8, 2011
7885351 Method of correcting gain and phase imbalance of a multi-carrier transmission signal, transmitter and base station Feb. 8, 2011
7881680 Predictive transmitter calibration Feb. 1, 2011
7881404 Distortion correction control apparatus and distortion correction control method Feb. 1, 2011
7881403 System for realizing emergency rate adjustment Feb. 1, 2011
7881402 Compensation for gain imbalance, phase imbalance and DC offsets in a transmitter Feb. 1, 2011
7881401 Transmitter arrangement and signal processing method Feb. 1, 2011
7881364 Method for generating a reference signal sequence using grouping Feb. 1, 2011
7876853 Phase error de-glitching circuit and method of operating Jan. 25, 2011
7876815 Methods and apparatus to qualify a wire-pair for a digital subscriber line (DSL) service Jan. 25, 2011
7873119 Input drive control for switcher regulated power amplifier modules Jan. 18, 2011
7873118 Apparatus and method for controlling peak to average power ratio (PAPR) Jan. 18, 2011
7869767 Method and apparatus for adaptively controlling signals Jan. 11, 2011
7869543 System and method for synchronization, power control, calibration, and modulation in communication transmitters Jan. 11, 2011
7869542 Phase error de-glitching circuit and method of operating Jan. 11, 2011
7869541 Method and system for direct and polar modulation using a two input PLL Jan. 11, 2011
7869540 Method and apparatus for increased communication channel pre-emphasis for clock-like data patterns Jan. 11, 2011
7869539 Methods, systems, and computer program products for rateless coding Jan. 11, 2011
7869484 Transmitter apparatus with adaptive power and phase for CDMA applications Jan. 11, 2011
7864881 Digital predistortion transmitter Jan. 4, 2011
7864880 Blind synchronization and demodulation Jan. 4, 2011
7860198 Combining signal-interference-ratio (SIR) estimates for improved SIR estimation Dec. 28, 2010
7860185 Distortion compensating apparatus and power amplifier apparatus Dec. 28, 2010
7860182 Receiver hardware reduction for spatially independent signals and associated methods Dec. 28, 2010
7856069 Distortion compensation apparatus Dec. 21, 2010
7856050 Receiver and transmitter calibration to compensate for frequency dependent I/Q imbalance Dec. 21, 2010
7856048 On-chip IQ imbalance and LO leakage calibration for transceivers Dec. 21, 2010
7852969 System and method for dynamic calibration of a quadrature encoder Dec. 14, 2010
7852966 Wireless communication base station apparatus and wireless communication method Dec. 14, 2010
7852911 Method and arrangement for channel simulation Dec. 14, 2010
7852781 Managing communications settings Dec. 14, 2010
7848716 Semiconductor integrated circuit for communication Dec. 7, 2010
7848456 Wireless data communication method via ultra-wide band encoded data signals, and receiver device for implementing the same Dec. 7, 2010
7848451 Digital pre-distortion technique using nonlinear filters Dec. 7, 2010
7848450 Methods and apparatus to pre-compensate for I/Q distortion in quadrature transmitters Dec. 7, 2010
7848449 Offset compensation device Dec. 7, 2010
7848436 Method for detecting OFDM timing in OFDM system Dec. 7, 2010
7848396 Methods, algorithms, software, circuits, receivers, and systems for increasing bandwidth and/or recording density in data communication and data storage systems Dec. 7, 2010
7847631 Method and apparatus for performing predistortion Dec. 7, 2010
7844014 Pre-distortion apparatus Nov. 30, 2010
7843274 Phase lock loop apparatus Nov. 30, 2010
7840014 Sound apparatus with howling prevention function Nov. 23, 2010
7839954 Phase rotation of IQ origin Nov. 23, 2010
7839950 Digital television transmitting system and receiving system and method of processing broadcast data Nov. 23, 2010
7839949 Peak suppression method, peak suppression apparatus and wireless transmission apparatus Nov. 23, 2010

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