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Class Information
Number: 375/298
Name: Pulse or digital communications > Transmitters > Quadrature amplitude modulation
Description: Subject matter in which the transmitted signal can be represented as the superposition of two modulated signals, each being obtained by pulse amplitude modulation of a signal sequence on a sinusoidal carrier, the two signal sequences being generated in synchronization at the same rate, and the two carriers being of the same frequency but 90 degrees apart in phase.










Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Patent Number Title Of Patent Date Issued
8711953 Method for transmitting a signal from a transmitter to a receiver in a power line communication network, transmitter, receiver, power line communication modem and power line communication syst Apr. 29, 2014
8693560 Transmission apparatus, transmission method, communication system, and communication method Apr. 8, 2014
8693575 Wireless precoding methods Apr. 8, 2014
8693576 Method of transmitting symbols Apr. 8, 2014
8675774 Constellation rearrangement for transmit diversity schemes Mar. 18, 2014
8675771 Log likelihood ratio arithmetic circuit, transmission apparatus, log likelihood ratio arithmetic method, and program Mar. 18, 2014
8675769 Constellation map optimization for highly spectrally efficient communications Mar. 18, 2014
8674758 Method and apparatus for improved high order modulation Mar. 18, 2014
8665989 Phase shifter, wireless communication apparatus, and phase control method Mar. 4, 2014
8665992 Pilot symbol generation for highly-spectrally-efficient communications Mar. 4, 2014
8659456 Electronic device and transmitter DC offset calibration method thereof Feb. 25, 2014
8660208 Apparatus and methods for QAM modulation using dual polar modulation 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
8638880 Radio base station and user equipment and methods therein Jan. 28, 2014
8634496 Method for determining and compensating transceiver non-idealities Jan. 21, 2014
8625702 Transmitting apparatus, transmission method, receiving apparatus, and receiving method Jan. 7, 2014
8625716 Method and apparatus for performing HARQ in wireless communication system Jan. 7, 2014
8620249 Method and system for process, voltage, and temperature (PVT) measurement and calibration Dec. 31, 2013
8611461 Method and device for modulating the information of TFCI Dec. 17, 2013
8611820 Signal separation for energy harvesting Dec. 17, 2013
8611833 Adaptive bearer configuration for broadcast/multicast service Dec. 17, 2013
RE44635 Orthogonal complex spreading method for multichannel and apparatus thereof Dec. 10, 2013
8605821 Apparatus and method for scrambling in a wireless communication system Dec. 10, 2013
8605820 Method of transmitting data in wireless communication system Dec. 10, 2013
8605774 Amplitude/phase delay calibration for envelope-tracking amplifier Dec. 10, 2013
RE44634 Ultra-wideband receiver and transmitter Dec. 10, 2013
8599938 Linear and polar dual mode transmitter circuit Dec. 3, 2013
8599965 Wireless communication apparatus Dec. 3, 2013
8595590 Systems and methods for encoding and decoding of check-irregular non-systematic IRA codes Nov. 26, 2013
8594233 Quadrature communications device with power combiner and related methods Nov. 26, 2013
8594231 Power series digital predistorter and distortion compensation control method therefor Nov. 26, 2013
8594228 Apparatus and method of differential IQ frequency up-conversion Nov. 26, 2013
8594213 Signal processing device and method Nov. 26, 2013
8588338 Driver circuit for driving a power amplifier Nov. 19, 2013
8576898 SLOC spot monitoring Nov. 5, 2013
8577309 Downstream adaptive modulation in broadband communications system Nov. 5, 2013
8571123 Apparatus and method for mapping symbol Oct. 29, 2013
8571135 Method, system and apparatus for balanced frequency up-conversion of a baseband signal Oct. 29, 2013
8565344 Transmission circuit and communication device Oct. 22, 2013
8565338 High bandwidth modulation and transmission Oct. 22, 2013
8565291 Communication apparatus, data communication method, and storage medium storing data communication program Oct. 22, 2013
8559552 Dual carrier modulation precoding Oct. 15, 2013
8553653 Arrangement and method for channel mapping in a wireless communication system Oct. 8, 2013
8553806 Quadrature modulation without carrier Oct. 8, 2013
8548094 Transmission device and modulation method Oct. 1, 2013
8548090 Transmitting apparatus and method in mobile communications system Oct. 1, 2013
8548079 Transmitter, transmission method, receiver, and reception method Oct. 1, 2013
8542764 Power and area efficient SerDes transmitter Sep. 24, 2013
RE44507 Orthogonal complex spreading method for multichannel and apparatus thereof Sep. 24, 2013

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