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7616926 |
Conductive DC biasing for capacitively coupled on-chip drivers
An integrated circuit containing a communication channel is described. This communication channel includes: a transmit circuit configured to transmit signals; a link coupled to an output of the...
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7606547 |
Active resistance summer for a transformer hybrid
An electrical circuit in a communications channel includes a first sub-circuit having a first input which receives a composite signal that includes a transmission signal component and a receive...
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7570935 |
Derivative superposition circuit for linearization
A derivative superposition circuit for linearization includes a first active element that is provided with first to third terminals and in which the magnitude and direction of current flowing from...
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7567783 |
I/Q mismatch calibration of direct conversion transceivers using the OFDM short training sequence
A system and method are provided for compensating for an I/Q mismatch of either a direct conversion transmitter or a direct conversion receiver based on known short training symbols of a Short...
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7561862 |
Automatic selection of compensation value to reduce IM2 product in mixed signal output
An apparatus, for automatically selecting a compensation value usable to reduce a second order intermodulation (IM 2 ) product in an output signal of a mixer, may include: a mixer to output a mixed...
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7551905 |
Distortion compensation apparatus
A distortion compensation apparatus of the present invention is used in a transmitter that produces and outputs a second signal from a first signal. This apparatus comprises a delay unit for...
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7542737 |
Method for reducing the 2nd order intermodulation level of a transconductor, and corresponding transconductor
A transconducting device includes at least one transistor having a control electrode for receiving an input signal whose frequency spectrum contains two different frequencies, an output electrode...
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7538632 |
Method and apparatus for controlling adaptive circuits
A feed-forward amplifier having a signal cancellation loop including a cancellation node that includes a gain controller and a phase controller. Each controller provides a discrete tap steering...
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7536162 |
Active resistive summer for a transformer hybrid
A transmit canceller comprises an amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal. A feedback element communicates with the second...
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7519340 |
Method and apparatus capable of mitigating third order inter-modulation distortion in electronic circuits
An embodiment of the present invention provides a method of mitigating third order inter-modulation distortion in electronic circuits, comprising estimating an IP3 of the circuits using an...
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7509109 |
Adaptive correction of a received signal frequency response tilt
Distortion due to transmission characteristics of a transmission medium is corrected by measuring leakage in a signal orthogonal to a received signal. The frequency response of an equalizer is...
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7474884 |
Receiver
The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses...
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7460832 |
Methods and apparatuses for minimizing co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises scrambling a first frame using a...
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7450906 |
Method and apparatus for removing cross modulation noise in a wireless transceiver
A method and apparatus are provided for removing cross modulation (CM) noise in a wireless transceiver. A determination is made as to whether a transmission signal to be supplied to a transmitter...
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7440740 |
Method of transmitting data where in a first mode, the power level is not indicated in a message and an NPSK modulation scheme is used, and in a second mode, the power level is indicated in a message in an NQAM modulation scheme is used
A method and apparatus for transmitting data from a first node to a second node of a communication system are provided. The method includes, in a first mode of operation, transmitting data via a...
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7433665 |
Apparatus and method for converting single-ended signals to a differential signal, and transceiver employing same
A communication circuit for an Ethernet or other network transceiver includes a first sub-circuit having a first input which receives a composite differential signal including first and second...
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7433664 |
System and method for radio signal reconstruction using signal processor
A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be...
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7412209 |
Shifted channel characteristics for mitigating co-channel interference
Methods and apparatuses for minimizing co-channel interference in communications systems are disclosed. A method in accordance with the present invention comprises shifting a characteristic of the...
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7412221 |
Crosstalk reduction method, apparatus, and system
A data driver drives a data signal on a channel, and a current mode driver drives a varying current on the channel to reduce crosstalk.
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7394783 |
Device and methods for increasing wireless connection speeds
Systems and methods may operate to increase the throughput of a wireless connection by passing a wireless signal from a communications subsystem to an application subsystem for physical layer...
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7392031 |
Method for cancelling a narrow-band interference signal
A method of canceling a narrow-band interference signal in a receiver is provided. A reference signal (ref_in) is subtracted from a received input signal (in). the phase of a result of the...
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7389099 |
Method and apparatus for canceling interference from high power, high data rate signals
A method and apparatus in a radio receiver for canceling interference from a high power, high data rate signal received in a combined signal that includes a contribution from the high power signal...
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7379725 |
LNA gain adjustment in an RF receiver to compensate for intermodulation interference
A Radio Frequency (RF) receiver includes a low noise amplifier (LNA) and a mixer coupled to the output of the LNA. The gain of the LNA is adjusted to maximize signal-to-noise ratio of the mixer and...
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7379711 |
Method and apparatus capable of mitigating third order inter-modulation distortion in electronic circuits
An embodiment of the present invention provides a method of mitigating third order inter-modulation distortion in electronic circuits, comprising estimating an IP3 of the circuits using an...
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7327995 |
Active resistance summer for a transformer hybrid
A transmit canceller comprises an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal. A feedback element communicates with the...
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7315592 |
Common mode noise cancellation
A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel...
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7302240 |
Communication apparatus
A communication apparatus has an A/D converter which converts an analog signal which was received, into a digital signal, a converter which converts a reception signal so as to enable handling of...
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7302231 |
MIMO communication system
The invention provides a generic and comprehensive architecture to optimise several space-time adaptive algorithms and their applications for both CCI and ISI interference cancellation for MIMO...
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7295813 |
Current reduction by dynamic receiver adjustment in a communication device
A method for reducing current drain in a communication device includes a first step of detecting interference including intermodulation and crossmodulation products. A next step includes...
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7257379 |
Compensating for analog radio component impairments to relax specifications
In order to compensate for performance degradation caused by inferior low-cost analog radio component tolerances of an analog radio, a future system architecture (FSA) wireless communication...
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7231193 |
Direct current offset correction systems and methods
A system and method for direct current offset correction are disclosed. One embodiment of the system includes a direct current offset correction circuitry having an adjustable bandwidth and control...
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7228120 |
Circuit and method for reducing direct current biases
A method is provided for reducing a DC bias in a receiver. This method includes isolating a second circuit portion from a first circuit portion ( 535 ) and determining a second DC bias correction...
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7218906 |
Layered space time processing in a multiple antenna system
A system and method for performing extended space-time processing. An improved symbol decision is generated of a desired sub-channel of the signal vector by first generating a baseline decision for...
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7206562 |
Cross polarized wave interference eliminating system and method
Coefficient controllers ( 68, 78 ) control weighting coefficients for tapped transversal filters used in interference compensators ( 67, 77 ) on the basis of transmission power control information...
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7184487 |
Receiver with chopper stabilization and method thereof
A receiver ( 202 ) has a down-conversion receiver ( 304 ) for transforming a signal ( 201 ) from a first operating frequency to a second operating frequency that is lower than the first operating...
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7167716 |
Synchronous demodulation apparatus of base transceiver station in interim standard-2000 system
The present invention provides a synchronous demodulation apparatus of a base transceiver station in an Interim Standard-2000 (IS-2000) system, including a first synchronous demodulation unit, a...
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7167511 |
Modem wake-up at steady state in a modem pool environment
In a communications system having a modem pool including native modems operating at steady state, a method is provided for modem wake-up at steady-state including measuring modem performance,...
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7161613 |
NTSC interference rejection filter
An electronic, programmable filter is disclosed which selectively removes interference, noise or distortion components from a frequency band without perturbing any of the other signals of the band....
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7158563 |
Dynamic digital communication system control
Methods, apparatus and systems for dynamically controlling a digital communication system, such as a DSL system, collect information about digital communication lines in the system and adaptively...
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7155193 |
Multi-channel filtering system for transceiver architectures
A multi-channel filtering system for use with a transceiver includes a front-end multi-pole, multi-throw switch, a back-end multi-pole, multi-throw switch, and a plurality of filters. The front-end...
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7151916 |
Method of receiving a signal and a receiver
A method of, and receiver for, countering distortions in radio channels due to intersymbol interference (ISI) and other non-linearities in a radio link, comprises a first equalizer ( 48 ) using a...
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7139543 |
Distortion reduction in a wireless communication device
The present invention provides a technique for cancellation of jammer signals in a radio frequency receiver. A radio frequency signal contains both a desirable signal and an undesirable jammer...
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7127211 |
Method and apparatus for reduced intermodulation distortion in a radio transceiver
A transceiver transmits first and second signals on first and second transmit radio frequencies. After detecting a received signal, intermodulation distortion caused by transmission of the first...
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7120410 |
LNA gain adjustment in an RF receiver to compensate for intermodulation interference
A Radio Frequency (RF) receiver includes a low noise amplifier (LNA) and a mixer coupled to the output of the LNA. The gain of the LNA is adjusted to maximize signal-to-noise ratio of the mixer and...
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7107031 |
Co-channel interference rejection in a digital receiver
The present invention relates to a method for a digital receiver and a receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication. It uses...
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7103341 |
Harmonic circuit for improving linearity
The present invention relates to a harmonic circuit for improving linearity, the harmonic circuit according to the present invention comprises a first terminal connected to a collector of a NPN...
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7088954 |
Wireless communication device
A wireless communication apparatus of the present invention has an interference signal cutoff circuit ( 10 ) for cutting off electric waves having interference frequencies of Δf=|frx±ftx|...
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7075948 |
Frequency offset estimator
Counter-clockwise and clockwise quadrant transitions are detected and accumulated with respect to a received complex signal over a certain time period. These transitions may then be compared in...
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7068990 |
Receiver for two orthogonally polarized signals
The inventive receiver has a receiving branch for each of the two signals (EH, EV) and a demodulator (MHE, MVE) and means (SH, SV) for synchronising the phase of the received signal (EH, EV) with...
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7058370 |
Transmission power amplifier unit
A transmission power amplifier unit of a base-station apparatus for compensating for non-linear distortion of a transmission power amplifier by feed-forward control is provided with a gain varying...
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