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Class Information
Number: 375/235
Name: Pulse or digital communications > Equalizers > Automatic > Adaptive > Quadrature channels
Description: Subject matter in which the received signal is processed to provide two components, one which differs in phase from the other by 90 degrees.










Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8711904 Calibration method for non-ideal transceivers Apr. 29, 2014
8693898 Adaptive equalizer, optical receiver, and tap coefficient correcting method Apr. 8, 2014
8687684 Apparatus and method for calibrating the I/Q mismatch in a quadrature bandpass sampling receiver Apr. 1, 2014
8681850 Signal processing apparatus, signal processing method and program Mar. 25, 2014
8654831 Signal detection apparatus Feb. 18, 2014
8639206 Method and apparatus for quadrature mixer circuits Jan. 28, 2014
8537884 Single path detection and equalizer optimization Sep. 17, 2013
8531325 Combined complex real mode delta-sigma ADC Sep. 10, 2013
8514925 Methods and apparatus for joint adaptation of transmitter transversal filter in communication devices Aug. 20, 2013
8509299 Decision feedback equalizer operable with multiple data rates Aug. 13, 2013
8457191 Adaptive equalizer and related methods Jun. 4, 2013
8401063 Decision feedback equalization scheme with minimum correction delay Mar. 19, 2013
8363712 Apparatus and method for adaptive I/Q imbalance compensation Jan. 29, 2013
8355430 Adaptive demodulation of a data communication Jan. 15, 2013
8351492 Estimation of intentional phase shift in a calibration apparatus Jan. 8, 2013
8335440 Method, system, and apparatus for blind equalization of BPSK signals Dec. 18, 2012
8325794 Apparatus and method for calibrating IQ mismatch Dec. 4, 2012
8279989 Device and process for data rate acquisition Oct. 2, 2012
8260072 Image encoding apparatus and method of controlling the same Sep. 4, 2012
8249139 Apparatus for data receiving and method for adjusting the same in real time Aug. 21, 2012
8233522 Decision feedback equalizer for digital TV and method thereof Jul. 31, 2012
8233524 Radio transmitter IQ imbalance measurement and correction methods and apparatus Jul. 31, 2012
8224091 Image processing apparatus, method of controlling the same, and program for extracting information usable for a search Jul. 17, 2012
8223883 Transmission circuit, method for determining delay time used in the transmission circuit, and communication apparatus using the transmission circuit Jul. 17, 2012
8208530 Apparatus and method for correcting IQ imbalance Jun. 26, 2012
8144759 Adaptive methods employing optimal convergence factors for processing complex signals and systems Mar. 27, 2012
8135094 Receiver I/Q group delay mismatch correction Mar. 13, 2012
8126086 System and method for in-phase/quadrature-phase (I/Q) mismatch measurement and compensation Feb. 28, 2012
8098724 Automatic calibration in high-speed serial interface receiver circuitry Jan. 17, 2012
8064542 Systems and methods for I/Q imbalance correction and calibration of variable modulus signals Nov. 22, 2011
8059707 Decoding method and apparatus Nov. 15, 2011
8054877 Constellation recovery for quadrature amplitude modulation Nov. 8, 2011
8050368 Nonlinear adaptive phase domain equalization for multilevel phase coded demodulators Nov. 1, 2011
8019540 Method and apparatus for processing navigational signals in a satellite navigation system Sep. 13, 2011
8014444 System and method for DC offset, amplitude and phase imbalance correction for I and Q baseband calibration Sep. 6, 2011
7978758 Efficient blind equalization for quadrature amplitude modulation Jul. 12, 2011
7957491 Digital technique of compensating mismatches between in phase and quadrature channels Jun. 7, 2011
7953033 Method of signalling, a communication system and a communication equipment May. 31, 2011
7936813 Diversity GMSK-receiver with interference cancellation and methods therein May. 3, 2011
7924962 Clock regeneration circuit technical field Apr. 12, 2011
7924911 Techniques for simulating a decision feedback equalizer circuit Apr. 12, 2011
7925236 Cross polarization interference canceling method and cross polarization interference canceling apparatus Apr. 12, 2011
7916804 Method and system for a fast-switching phase-locked loop using a direct digital frequency synthesizer Mar. 29, 2011
7881405 Combined mixer and polyphase decimator Feb. 1, 2011
7864836 Adaptive orthogonal frequency division multiplexing (OFDM) equalizers, OFDM receivers including the same, and methods thereof Jan. 4, 2011
7826864 Apparatus and method for power measurement summation in mobile telecommunications system user equipment Nov. 2, 2010
7821915 Channel tracking in an OFDM wireless receiver Oct. 26, 2010
7813424 Method and apparatus for compensating for mismatch occurring in radio frequency quadrature transceiver using direct-conversion scheme Oct. 12, 2010
7796708 Adaptive receiver loops with weighted decision-directed error Sep. 14, 2010
7764733 Constellation recovery for quadrature amplitude modulation Jul. 27, 2010

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