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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 1,119


Patents under this class:

Patent Number Title Of Patent Date Issued
8712339 Methods and apparatus for power amplifier calibration Apr. 29, 2014
8711975 Tomlinson Harashima precoding with additional receiver processing in a multi-user multiple-input multiple-output wireless transmission system Apr. 29, 2014
8711974 Systems and methods for mitigating spectral regrowth from non-linear systems Apr. 29, 2014
8711957 Apparatus and method for transmitting and receiving data Apr. 29, 2014
8711907 PMI feedback with codebook interpolation Apr. 29, 2014
8711904 Calibration method for non-ideal transceivers Apr. 29, 2014
8706070 RF system for reducing intermodulation (IM) products Apr. 22, 2014
8705659 Communication channel optimization systems and methods in multi-user communication systems Apr. 22, 2014
8705654 Measuring phase shift in a radio frequency power amplifier Apr. 22, 2014
8705647 Maximum-likelihood MIMO demodulation for frequency-selective channels Apr. 22, 2014
8705642 Method for mitigating interference in OFDM communications systems Apr. 22, 2014
8704595 Predistortion apparatuses and methods Apr. 22, 2014
8693962 Analog power amplifier predistortion methods and apparatus Apr. 8, 2014
8693577 Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining Apr. 8, 2014
8693566 Methods and systems for combined cyclic delay diversity and precoding of radio signals Apr. 8, 2014
8693563 Method of transmitting and receiving orthogonal frequency division multiplexing (OFDM) signal using multiple antennas, and transmitter and receiver thereof Apr. 8, 2014
8692702 Analog-digital converter and power saving method thereof Apr. 8, 2014
8687727 Coordinated multi-point transmission using interference feedback Apr. 1, 2014
8687719 Method and apparatus for OFDM spectral diversity using guard bands Apr. 1, 2014
8687715 Method and system for rate reduction pre-coding matrices Apr. 1, 2014
8687713 Optimum radio communication method with radio frame variable control and radio communication system using the same Apr. 1, 2014
8681897 Dynamic digital communication system control Mar. 25, 2014
8681896 Transmitter I/Q and carrier leak calibration Mar. 25, 2014
8681888 Link adaptation for OFDM systems Mar. 25, 2014
8681883 Communicating over powerline media using spot beamforming Mar. 25, 2014
8681849 Precoder construction and equalization Mar. 25, 2014
8681840 Transceivers having loopback switches and methods of calibrating carrier leakage thereof Mar. 25, 2014
8675714 Trace canceller with equalizer adjusted for trace length driving variable-gain amplifier with automatic gain control loop Mar. 18, 2014
8670502 Selective peak power reduction Mar. 11, 2014
8670501 Digital pre-distortion of non-linear systems with reduced bandwidth feedback Mar. 11, 2014
8666336 Digital pre-distortion with model-based order estimation Mar. 4, 2014
8665991 Communications device with separate I and Q phase power amplification having selective phase and magnitude adjustment and related methods Mar. 4, 2014
8665978 Wireless communication apparatus and wireless communication method Mar. 4, 2014
8665945 Encoding method, decoding method, encoding device, decoding device, program, and recording medium Mar. 4, 2014
8665933 Data transmitting and receiving method and device for communication and system thereof Mar. 4, 2014
8665931 Calibration of communication processing path Mar. 4, 2014
8665740 Method and devices for bit rate allocation for point-to-multipoint multimedia communications Mar. 4, 2014
8665128 Sigma-delta difference-of-squares log-RMS to DC converter with forward path multiplier and chopper stabilization Mar. 4, 2014
8665127 .SIGMA.-.DELTA. difference-of-squares RMS to DC converter with multiple feedback paths Mar. 4, 2014
8660224 Method and system for pre-equalization in a single weight spatial multiplexing MIMO system Feb. 25, 2014
8660208 Apparatus and methods for QAM modulation using dual polar modulation Feb. 25, 2014
8660207 Digital pre-distortion with carrier cancellation Feb. 25, 2014
8660206 Method of generating pulse waveform Feb. 25, 2014
8660066 Method for constructing RACH preamble and method for transmitting RACH signal Feb. 25, 2014
8659456 Electronic device and transmitter DC offset calibration method thereof Feb. 25, 2014
8655292 Amplifier circuit, transmitter, and method of controlling amplifier circuit Feb. 18, 2014
8655289 Distortion compensation device, transmitter, and distortion compensation method Feb. 18, 2014
8654891 Peak suppressing apparatus, peak suppressing method and wireless communications apparatus Feb. 18, 2014
8654890 Adaptive real-time control of de-emphasis level in a USB 3.0 signal conditioner based on incoming signal frequency range Feb. 18, 2014
8654889 Adaptive compensation systems for mitigating distortion due to nonlinear power amplifiers Feb. 18, 2014











 
 
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