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| Number | Title | Issue Date |
| 8363712 | Apparatus and method for adaptive I/Q imbalance compensation An I/Q imbalance compensation block of a RF receiver for compensating an imbalance between an in-phase component and a quadrature component of an RF signal is disclosed. The compensation block includes a conjugation block; an adaptive finite impulse response (FIR) f... | 01/29/2013 |
| 8325794 | Apparatus and method for calibrating IQ mismatch An apparatus and a method for calibrating IQ mismatch to ensure that an in-phase oscillating signal and a quadrature-phase oscillating signal are orthogonal to each other. The apparatus includes a mixer for mixing the in-phase oscillating signal with the quadrature-... | 12/04/2012 |
| 8249139 | Apparatus for data receiving and method for adjusting the same in real time A data receiver and a method for adjusting the same are provided. The data receiver has an equalizer, a clock data recovery unit, an equalizer controller, and a decoder. The equalizer compensates incoming signal according to a configuration, and outputs corrected si... | 08/21/2012 |
| 8233524 | Radio transmitter IQ imbalance measurement and correction methods and apparatus Embodiments include transceivers and transmit IQ imbalance correction methods. A transmitter lineup, which includes an equalizer and an RF modulator, receives a stream of baseband samples having real and imaginary components, processes the real components along a fi... | 07/31/2012 |
| 8208530 | Apparatus and method for correcting IQ imbalance An apparatus and method for correcting IQ imbalance are presented. An exemplary receiver for processing I and Q signals from a tuner includes: a non-decision directed (NDD) imbalance canceller coupled to receive the I and Q signals, and a decision directed (DD) imba... | 06/26/2012 |
| 8054877 | Constellation recovery for quadrature amplitude modulation Methods and apparatus are provided for receiving an input signal. In an embodiment of the invention a current candidate QAM constellation can be selected. A mean squared error of a signal responsive to the input signal can be computed based on the current candidate ... | 11/08/2011 |
| 8014444 | System and method for DC offset, amplitude and phase imbalance correction for I and Q baseband calibration An algorithm is provided that computes values for correcting for DC offsets of baseband I and Q signals, compensates for amplitude imbalance between the baseband I and Q signals and compensates for phase imbalance between the baseband I and Q signals. Test signals a... | 09/06/2011 |
| 7936813 | Diversity GMSK-receiver with interference cancellation and methods therein Method in a diversity antenna GMSK receiver of determining interference canceling equalizers and corresponding equalizers are described. The method includes providing a plurality of GMSK received signals; de-rotating and splitting each of the plurality of received s... | 05/03/2011 |
| 7864836 | Adaptive orthogonal frequency division multiplexing (OFDM) equalizers, OFDM receivers including the same, and methods thereof An orthogonal frequency division multiplexing (OFDM) equalizer includes a memory that stores OFDM frame information, a partial sum calculator configured to calculate a partial sum of a data cell corresponding to an OFDM reception signal based on a current pilot cell... | 01/04/2011 |
| 7813424 | Method and apparatus for compensating for mismatch occurring in radio frequency quadrature transceiver using direct-conversion scheme A method and apparatus for compensating for a mismatch in a radio frequency (RF) quadrature transceiver using a direct-conversion scheme is provided. The method includes setting an amplification gain for a baseband quadrature signal to be larger than an amplificatio... | 10/12/2010 |
| 7764733 | Constellation recovery for quadrature amplitude modulation Methods and apparatus are provided for receiving an input signal. In an embodiment of the invention a current candidate QAM constellation can be selected. A mean squared error of a signal responsive to the input signal can be computed based on the current candidate ... | 07/27/2010 |
| 7733953 | Apparatus and method for adaptively correcting I/Q imbalance An apparatus and method for adaptively correcting I/Q imbalance, which is used in a receiver for correcting a received I/Q imbalanced signal to thus eliminate the I/Q imbalance. First, an interference amount caused by interference from an imbalanced in-phase signal ... | 06/08/2010 |
| 7649934 | Apparatus and method for adaptively correcting I/Q imbalance An apparatus and method for adaptively correcting I/Q imbalance, which is used in a receiver for correcting a received I/Q imbalanced signal to thus eliminate the I/Q imbalance. First, an interference amount caused by interference from an imbalanced in-phase signal ... | 01/19/2010 |
| 7477687 | Balancing amplitude and phase A system for balancing a signal having I and Q components includes means for cross correlating the I and Q components to produce a cross correlation product; means for adjusting the gain of each I and Q signal component in accordance with said cross correlation prod... | 01/13/2009 |
| 7443909 | Weighted autocorrelation method for downlink CDMA LMMSE equalizers Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by p... | 10/28/2008 |
| 7433418 | Method and apparatus for efficient storage of training sequences for peak to average power constrained modulation formats Some embodiments store a training sequence in a communications system. The stored training sequence exhibits certain desirable characteristics when used by a peak to average power constrained modulation format. In one embodiment, a set of original ordered sequences ... | 10/07/2008 |
| 7426243 | Preprocessing signal layers in a layered modulation digital signal system to use legacy receivers Systems and methods for receiving non-coherent layered modulation signals are presented. An exemplary apparatus comprises a tuner for receiving a layered signal and producing a layered in-phase signal and a layered quadrature signal therefrom, an analog-to-digital c... | 09/16/2008 |
| 7397758 | Channel tracking in a OFDM wireless receiver An apparatus and a method to estimate the channel response for a set of subcarriers in an OFDM receiver. The receiver receives a packet of information that includes a known transmitted part having known subcarrier values, and includes a signal-to-tone transformer to... | 07/08/2008 |
| 7394881 | Radio receiver and/or transmitter including a programmable equalizer A radio receiver includes a low noise amplifier, a down conversion module, an analog to digital converter, and a digital demodulator. The digital demodulator is operably coupled to convert the digital low IF signals into inbound digital symbols and includes a baseba... | 07/01/2008 |
| 7366362 | QPSK light modulator The present invention provides a light transmitter with a stable IQ amplitude ratio relative to the characteristic change of a modulating system. The QPSK light modulator of the present invention includes a laser light source for outputting light; an optical demulti... | 04/29/2008 |
| 7362857 | Subscriber line interface circuitry transceiver A subscriber line interface circuit apparatus includes a first driver for driving a downstream data signal in a non-voiceband range onto a subscriber line and a second driver for driving a downstream voice signal in a voiceband range onto the subscriber line. The ap... | 04/22/2008 |
| 7362855 | Subscriber line interface circuitry transceiver A subscriber line interface circuit apparatus includes driver circuitry for combining and driving a downstream voice signal and a downstream data signal onto a subscriber line. Receiver circuitry receives and separates an upstream signal from the subscriber line int... | 04/22/2008 |
| 7359459 | System and method for low power clear channel assessment A method is provided for performing a clear channel assessment in a local device. The local device receives signal energy in a wireless channel and splits the received signal energy into a real portion and an imaginary portion. It determines a real portion of a squa... | 04/15/2008 |
| 7356103 | Signal processing circuit and quadrature demodulation apparatus and method of estimating error thereof To provide a signal processing circuit which makes it possible to accurately estimate not only amplitude error but also phase error of a signal caused by device characteristics of components of a receiver, correct swiftly the error component without providing feedba... | 04/08/2008 |
| 7352408 | Suppression of multipath effects in the transmission of analog TV signals A method for compensating for multipath effects when receiving a vestigial sideband modulated TV signal, one portion of the spectrum of the undistorted TV signal being symmetrical with respect to a video carrier frequency, and deviations from the symmetry of the rel... | 04/01/2008 |
| 7349677 | Hardware efficient RF transceiver I/Q imbalance compensation based upon taylor approximation Radio transceiver circuitry includes I/Q imbalance compensation logic within at least one of a digital modulator or a digital demodulator, depending upon whether the I/Q imbalance compensation block is compensating for I/Q imbalance in a transmit path or in a receiv... | 03/25/2008 |
| 7349459 | Multiuser detection method and device in DS-CDMA mode A method and device for processing a received signal by detecting within the received signal a plurality of possible symbols transmitted by or for a plurality K of users, each of the plurality of possible symbols belonging to a modulation constellation and being the... | 03/25/2008 |
| 7336730 | IQ-imbalance The invention relates to a method for correcting an IQ-imbalance (In-phase and Quadrature) of an IQ-based direct conversion receiver (200). In the method a group of radio frequency pilot signals are received in the direct conversion receiver (200). The... | 02/26/2008 |
| 7333423 | Transceiver with calibrated I and Q paths and methods for deconvolved calibration Phase and amplitude offsets of a multicarrier transceiver may be reduced by measuring receiver amplitude and phase mismatches of receiver radio-frequency (RF) circuitry by performing a fast Fourier transform (FFT) on a receiver calibration signal. ... | 02/19/2008 |
| 7332950 | DLL measure initialization circuit for high frequency operation A memory device, delay lock loop circuit (DLL) and DLL reset circuitry are described. The DLL includes a shift register and a measured delay for pre-loading the shift register. The reset circuitry selectively filters a clock signal propagation through the measured d... | 02/19/2008 |
| 7333155 | Quadratic video demodulation with baseband nyquist filter A television tuner is fully implemented on a monolithic integrated circuit. The television tuner includes a baseband SAWF function fully integrated in silicon. The SAWF function includes trap and bandpass filters. A video demodulation circuit includes an I, Q demodu... | 02/19/2008 |
| 7327775 | CDMA receiver A signal reception method including method and apparatus for receiving a signal, down converting the received signal through multi-tone down conversion to form an intermediate signal, and decoding the intermediate signal to extract data. In an embodiment, the receiv... | 02/05/2008 |
| 7327782 | Receiving apparatus and method of high speed digital data communication system A receiving apparatus of a high speed digital data communication system includes: a mobile station modem (MSM) for judging a modulation method according to a data rate of a received signal and a position of a data pointer; a controller for controlling a control sign... | 02/05/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7319719 | Parallel equalization for systems using time division multiple access An equalization circuit is provided. The equalization circuit includes an input adapted to receive signals from a communications channel. The equalization circuit further includes a plurality of equalizer circuits coupled to the input and operable to generate a plur... | 01/15/2008 |
| 7315575 | Equalization strategy for dual-polarization optical transport system A method is provided for an equalization strategy for compensating channel distortions in a dual-polarization optical transport system wherein the received signal includes a complex signal of a first transmitted polarization component and a complex signal of a secon... | 01/01/2008 |
| 7302013 | Multi-mode variable rate digital satellite receiver Digital signal processing for television signals includes digital feedback loops. Analog information signals are oversampled to provide digital signals. The digital signals are introduced to a digital carrier recovery loop and a digital symbol recovery loop. The gai... | 11/27/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7289425 | Parallel orthogonal frequency division multiplexed communication system A parallel orthogonal frequency division multiplexed (OFDM) communications system includes a transmitter and receiver, the transmitter having a parallel fast Fourier transform (FFT) module operating in parallel to a conventional inverse fast Fourier transform (IFFT)... | 10/30/2007 |
