Resources Contact Us Home
Browse by Category: Main > Communications
Class Information
Number: 375/280
Name: Pulse or digital communications > Systems using alternating or pulsating current > Angle modulation > Phase shift keying > More than two phases
Description: Subject matter in which the phase of the carrier wave is shifted between three or more phases.

Sub-classes under this class:

Class Number Class Name Patents
375/281 Quaternary 148

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
RE44634 Ultra-wideband receiver and transmitter Dec. 10, 2013
8503573 Bits-to-symbol mapping method for 4+12+16 APSK modulation Aug. 6, 2013
8498355 Device and method for correcting a data error in communication path Jul. 30, 2013
8494071 Device and method for correcting a data error in communication path Jul. 23, 2013
8446306 Method for mixing a complex digital signal with a reference signal, mixer and digital-to-analogue converter using the method May. 21, 2013
8391352 Low-cost ATSC-receiver-compatible digital TV modulator Mar. 5, 2013
8315586 Signal receiving device and signal receiving method using same, and signal supplying unit and signal supplying method using same Nov. 20, 2012
8249192 Techniques to transmit data rate control signals for multi-carrier wireless systems Aug. 21, 2012
8199847 Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying(QPSK) or offset quaternary phase shift keying (OQPSK) Jun. 12, 2012
8139660 Methods and apparatus related to using a wireless terminal scrambling identifier Mar. 20, 2012
8139688 Differential receiver with frequency offset compensation Mar. 20, 2012
8135082 High-order modulation-based burst mapping method and apparatus in a mobile communication system Mar. 13, 2012
8121214 Local oscillator with non-harmonic ratio between oscillator and RF frequencies using XOR operation Feb. 21, 2012
8121241 Method and apparatus for processing radio frequency signals Feb. 21, 2012
8050368 Nonlinear adaptive phase domain equalization for multilevel phase coded demodulators Nov. 1, 2011
8050351 Quadrature modulator with feedback control and optical communications system using the same Nov. 1, 2011
7995678 System and method for communicating data using weighted bit soft decisions for differentially encoded phase shift keying Aug. 9, 2011
7933354 Encoding and decoding architecture and method for pipelining encoded data or pipelining with a look-ahead strategy Apr. 26, 2011
7899402 Doppler estimation Mar. 1, 2011
7894537 Adaptive data alignment Feb. 22, 2011
7894541 Communication system Feb. 22, 2011
7852962 Systems and methods for implementing a data control channel in a wireless communication system Dec. 14, 2010
7844011 Apparatus and method for improving symbol error rate performance of M-ary phase shift keying system having quadrature error Nov. 30, 2010
7835479 Jitter injection apparatus, jitter injection method, testing apparatus, and communication chip Nov. 16, 2010
7809083 Differential receiver with frequency offset compensation Oct. 5, 2010
7796700 Method and system for computing log-likelihood ratios for coded quadrature amplitude modulated signals Sep. 14, 2010
7778618 Systems and methods for reducing broadband image noise through a programmable bandwidth RF variable gain attenuator Aug. 17, 2010
7778344 System and method for combining a plurality of signals of various phases having a wide frequency range Aug. 17, 2010
7769096 QM-CPM modems with higher order signaling Aug. 3, 2010
7715484 Orthogonal frequency division multiplexing with PN-sequence May. 11, 2010
7660367 Base station using a multicarrier communication band divided into a plurality of blocks Feb. 9, 2010
7649957 Non-overlapping multi-stage clock generator system Jan. 19, 2010
7606321 System and method for simplifying analog processing in a transmitter incorporating a randomization circuit Oct. 20, 2009
7583744 Method and apparatus for computing soft decision input metrics to a turbo decoder Sep. 1, 2009
7545881 Method and apparatus for controlling spurious transmissions in a communications system Jun. 9, 2009
7542521 Direct-conversion frequency mixer Jun. 2, 2009
7515645 Method for dividing the bit rate of QPSK signals into two or several subchannels Apr. 7, 2009
7496146 Communication system Feb. 24, 2009
7480351 Technique for demodulating level II hierarchical data Jan. 20, 2009
7466769 Method and apparatus of cross-correlation Dec. 16, 2008
7457375 Timing extractor, timing extraction method, and demodulator having the timing extractor Nov. 25, 2008
7443921 Mobile body communication apparatus Oct. 28, 2008
7436902 Multi-dimensional space Gray code maps for multi-dimensional phase modulation as applied to LDPC (Low Density Parity Check) coded modulation Oct. 14, 2008
7409012 Modulator and signaling method Aug. 5, 2008
7398075 Radio wave reception device and radio wave clock Jul. 8, 2008
7369598 Ultra-wideband receiver and transmitter May. 6, 2008
7362813 Communication system Apr. 22, 2008
7352822 Telephone for transmitting an uplink signal to a base station and for receiving first and second downlink signals from the base station, and a base station for receiving an uplink signal from Apr. 1, 2008
7315574 System and method for generating a jittered test signal Jan. 1, 2008
7260159 Method and apparatus for providing higher order modulation that is backwards compatible with quaternary phase shift keying (QPSK) or offset quaternary phase shift keying (OQPSK) Aug. 21, 2007

1 2 3 4

  Recently Added Patents
Solid state lighting devices and associated methods of manufacturing
Methods and systems for assessing sales activity of a merchant
Apparatus and method for information display of portable device
Systems, methods and apparatus for payment processing
Array substrate including thin film transistor and method of fabricating the same
Computer system and volume migration control method using the same
Wall flow type exhaust gas purification filter
  Randomly Featured Patents
Process for the production of molded decorative articles from a hardenable substance based on thermosetting synthetic resin
Artificial bat end device
Arrangement for mounting a non-rotating component
Device for loading bulk material
Windshield wiper arm connector
Network security software
Developing device and process cartridge with predetermined magnetic force for an image forming apparatus
Apparatus for supporting a work piece
Semiconductor device using a conductive film and method of manufacturing the same
Clutch handler