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9032449 |
Algorithm for improving transponder scanning in a satellite set-top box
The present invention concerns a method and associated apparatus for reducing the time required to scan an incoming satellite transmission power spectrum for available signals and to determine the... |
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9020026 |
Frequency dependent I/Q imbalance compensation
A method and system for compensating for frequency dependent phase and amplitude imbalances is provided. A plurality of frequency sub-bands is extracted from a received wideband signal. Each of... |
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8995594 |
Baseband cancellation of platform radio interference
Briefly, in accordance with one or more embodiments, a platform may comprise a receiver to receive a signal that includes an error in the received signal due to a noise signal generated in the... |
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8976855 |
Power and area efficient receiver equalization architecture with relaxed DFE timing constraint
An exemplary receiver equalizer includes a first decision feedback equalizer (DFE) sampler coupled to a summer, the first DFE to latch an equalized output of the summer. The first branch includes... |
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8958504 |
Carrier recovery in amplitude and phase modulated systems
A method is provided. A multi-amplitude signal is received and downconverted so as to generate I and Q signals using a local oscillator signal. The I and Q signals are equalized, and the equalized... |
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8923434 |
Method and apparatus for modifying a complex-valued signal, and mobile communication device
A method and an apparatus for modifying a complex-valued signal are described, the complex-valued signal representing a first symbol and a second symbol. A signal trajectory of the complex-valued... |
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8885692 |
Estimation of intentional phase shift in a calibration apparatus
Embodiments of the present invention provide an apparatus comprising a transceiver having a receiver and a transmitter connected through a segment of a calibration loop back path. The apparatus... |
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8879615 |
Equalization adaptation using timing detector
An equalization adaptation circuit comprises an equalizer, a transition determination circuit, a phase error circuit, a sequence recovery circuit, a phase error accumulator circuit, a transition... |
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8792591 |
Systems and methods for I/Q imbalance correction and calibration of variable modulus signals
Disclosed herein are systems and methods for accurate removal of I/Q mismatch in received signals of an analog FM receiver. The analog FM receiver includes a down-converter, a calibration circuit... |
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8792545 |
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... |
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8737926 |
Scheduling of beamformed data to reduce interference
A system and method are disclosed for coordinating the scheduling of beamformed data to reduce interference in a wireless system. A customer premise equipment (CPE) uses a plurality of bits to... |
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8737461 |
Receiving equalization device in communication system and receiving equalization method
Disclosed are a receiving equalization device and a method thereof, the receiving equalization device including a subtracter to output a first output signal, an eye monitor block to obtain a... |
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8711904 |
Calibration method for non-ideal transceivers
A method of determining non-ideality characteristics introduced on a signal by a transceiver is disclosed. The transceiver has an up-conversion transmitter and a down-conversion receiver. In one... |
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8699559 |
Decision feedback equalization scheme with minimum correction delay
A decision feedback equalizer includes a correction circuit to correct a sampled value of an incoming bit based on intersymbol interference of at least one preceding bit, and to generate a... |
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8693898 |
Adaptive equalizer, optical receiver, and tap coefficient correcting method
An adaptive equalizer includes a finite impulse response filter with a predetermined number of taps; and a tap coefficient adaptive controller having a register to hold tap coefficients for the... |
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8687684 |
Apparatus and method for calibrating the I/Q mismatch in a quadrature bandpass sampling receiver
A calibration technique to compensate for the phase error between the in-phase and quadrature sampling clocks controlling the quadrature bandpass sampling delta-sigma analog-to-digital demodulator... |
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8681850 |
Signal processing apparatus, signal processing method and program
A signal processing apparatus includes a signal processing unit configured to carry out signal processing on a single-carrier signal and a multi-carrier signal by making use of a plurality of... |
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8654831 |
Signal detection apparatus
A signal detection apparatus detects the frequency of an input signal without using a PLL. The detection apparatus includes a first and a second orthogonalizer, a phase difference calculator and... |
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8639206 |
Method and apparatus for quadrature mixer circuits
The teachings presented herein allow the same sequence of local oscillator waveform sample values to be used for driving two harmonic rejection mixers for which quadrature operation is desired,... |
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8537884 |
Single path detection and equalizer optimization
An algorithm to detect single path channel conditions and reduce the span (number of taps) of the equalizer in order to mitigate the performance degradation caused by noisy equalizer taps is... |
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8531325 |
Combined complex real mode delta-sigma ADC
A delta-sigma analog-to-digital converter (ADC) is disclosed. In one embodiment, the delta-sigma ADC includes a dual mode resonator and a plurality of switches. The delta-sigma ADC is configured... |
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8514925 |
Methods and apparatus for joint adaptation of transmitter transversal filter in communication devices
Methods and apparatus are provided for joint adaptation of filter values in two communicating devices, such as a link partner and a link device. The disclosed joint adaptation process initially... |
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8509299 |
Decision feedback equalizer operable with multiple data rates
Decision feedback equalization (DFE) circuitry and method for equalizing data signals over a wide range of data rates. By using delayed and controlled versions of the recovered data clock to... |
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8457191 |
Adaptive equalizer and related methods
An adaptive equalizer. Implementations of adaptive equalizers may include implementations of 8-QAM adaptive equalizers that may include a signal filter, an adaptive processor coupled to the signal... |
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8401063 |
Decision feedback equalization scheme with minimum correction delay
A decision feedback equalizer includes a correction circuit to correct a sampled value of an incoming bit based on intersymbol interference of at least one preceding bit, and to generate a... |
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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... |
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8355430 |
Adaptive demodulation of a data communication
An embodiment of the invention pertains to demodulating a data communication into a sequence of symbols. In this embodiment, a first filter generates a first convolution between a first plurality... |
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8351492 |
Estimation of intentional phase shift in a calibration apparatus
Embodiments of the present invention provide an apparatus comprising a transceiver having a receiver and a transmitter connected through a segment of a calibration loop back path. The apparatus... |
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8335440 |
Method, system, and apparatus for blind equalization of BPSK signals
A system, method, and apparatus is disclosed for enabling a constant modulus algorithm (CMA) to be reliably used for blind equalization training of an equalizer. According to one embodiment,... |
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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... |
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8279989 |
Device and process for data rate acquisition
A baud rate acquisition circuit (10) for synchronizing a sampling signal with an input signal operates in broad rate sweeping and a rate fine tuning phases. In the rate sweeping phase, a timing... |
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8260072 |
Image encoding apparatus and method of controlling the same
This invention provides a technique of easily encoding image data to generate encoded data having high image quality within a target code amount using a small memory capacity by image encoding... |
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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... |
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8233522 |
Decision feedback equalizer for digital TV and method thereof
The conventional decision feedback equalizer has a drawback that can't decide symbols correctly because a simple slicer is used as a symbol detector. A decision feedback equalizer as a symbol... |
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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... |
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8224091 |
Image processing apparatus, method of controlling the same, and program for extracting information usable for a search
Input image data is converted into vector data. The type of the input image data is determined. If it is determined that the input image data is of a first data type, information usable for a... |
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8223883 |
Transmission circuit, method for determining delay time used in the transmission circuit, and communication apparatus using the transmission circuit
An amplitude signal and a frequency signal are generated through processing of data. The frequency signal is angle modulated. The amplitude signal is adjusted based on a delay time and is... |
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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... |
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8144759 |
Adaptive methods employing optimal convergence factors for processing complex signals and systems
Complex adaptive methods for complex information processing employ optimal individual convergence factors for real and imaginary components of the weight vector. For wireless receivers operating... |
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8135094 |
Receiver I/Q group delay mismatch correction
A device for minimizing group delay mismatch in a quadrature receiver (402) having an in-phase channel and a quadrature-phase channel. The device includes a microprocessor (465) for determining an... |
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8126086 |
System and method for in-phase/quadrature-phase (I/Q) mismatch measurement and compensation
A system for determining in-phase and quadrature-phase mismatch in a multiple-input, multiple-output (MIMO) communication architecture includes at least one transmitter coupled to at least one... |
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8098724 |
Automatic calibration in high-speed serial interface receiver circuitry
Circuitry for receiving a serial data signal (e.g., a high-speed serial data signal) includes adjustable equalizer circuitry for producing an equalized version of the serial data signal. The... |
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8064542 |
Systems and methods for I/Q imbalance correction and calibration of variable modulus signals
Disclosed herein are systems and methods for accurate removal of I/Q mismatch in received signals of an analog FM receiver. The analog FM receiver includes a down-converter, a calibration circuit... |
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8059707 |
Decoding method and apparatus
A decoding unit for decoding a modulated signal includes a summing unit having i) a first input, ii) a second input, and iii) an output. The summing unit is configured to i) receive the modulated... |
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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... |
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8050368 |
Nonlinear adaptive phase domain equalization for multilevel phase coded demodulators
A novel and useful apparatus for and method of nonlinear adaptive phase domain equalization for multilevel phase coded demodulators. The invention improves the immunity of phase-modulated signals... |
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8019540 |
Method and apparatus for processing navigational signals in a satellite navigation system
In a method and apparatus for processing a received navigation signal x′(t) of a satellite navigation system, the received navigation signal x′(t) contains at least four navigation codes. The... |
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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... |
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7978758 |
Efficient blind equalization for quadrature amplitude modulation
Methods and apparatus are provided for receiving a signal transmitted with a quadrature amplitude modulation (QAM) constellation. In an embodiment of the invention, a blind equalization algorithm... |
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7957491 |
Digital technique of compensating mismatches between in phase and quadrature channels
Methods and systems for filtering include accessing first and second signals produced from an input signal and producing first and second filtered outputs, which correspond to the first and second... |