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| Number | Title | Issue Date |
| 8180309 | Lock-in amplifier and method for filtering a measurement signal using such an amplifier A lock-in amplifier with an additional phase-sensitive detector is provided. A measurement signal is mixed in a multiplicative fashion with a reference signal, which is phase-shifted by 90 degrees, for a modulation frequency. In order to reliably filter out interfer... | 05/15/2012 |
| 8165553 | Current-matching intermodulation suppression A circuit is provided for suppression of second-order intermodulation in a double-balanced mixer circuit. The circuit includes a duplicate transconductor element for duplicating AC current in a transconductor pair of the double-balanced mixer circuit. A fundamental ... | 04/24/2012 |
| 8155615 | Generation of a composite mitigation signal with a desired spectral energy distrubution A method (1100, 1200) of generating a composite mitigation signal (216, 902, 1002) is presented. The composite mitigation signal includes an odd integer (N) of transitions (310, 312) between a first amplitude and a second amplitude of the compos... | 04/10/2012 |
| 8150356 | Split analog/digital polynomial nonlinear term generator with reduced number of analog-to-digital converters A polynomial nonlinear term generator is configured to receive an RF signal. An analog cubic term generator generates an analog cubic term signal and an analog square term generator generates an analog square term signal, both derived from the RF signal. A cubic ter... | 04/03/2012 |
| 8081946 | Interference cancellation for reconfigurable direct RF bandpass sampling interference cancellation Sampling may be employed to cancel an analog input radio frequency (RF) signal by using an upconverted analog cancellation RF signal to cancel the analog input RF signal at the sample instances. At least two sampling paths may be employed, a signal path and a cancel... | 12/20/2011 |
| 8078130 | Systems and methods for interference cancellation Systems and methods for interference cancellation in which a first signal having a first frequency may be cancelled with a second frequency having a second and different (e.g., lower) frequency by employing sampling to cancel the first signal with the separate signa... | 12/13/2011 |
| 8050644 | Highly linear mixer and method for cancelling FET channel resistance modulation A highly linear mixer and method for cancelling field effect transistor channel resistance modulation are provided. At least a portion of the voltage of an input signal is added to a drive signal to cancel distortion arising from modulation of the voltage of the inp... | 11/01/2011 |
| 8032102 | Receiver second order intermodulation correction system and method A system for correcting a second order intermodulation product in a direct conversion receiver is provided. The system includes a cross-covariance system receiving a data signal and a second order intermodulation estimate signal and generating a cross-covariance val... | 10/04/2011 |
| 7925236 | Cross polarization interference canceling method and cross polarization interference canceling apparatus A cross polarization interference canceling apparatus of the present invention includes: error detector 26 for extracting a difference between a demodulated signal that is the main polarization signal in which compensation for cross polarization interference ... | 04/12/2011 |
| 7912436 | 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 to force the mixer to operate well within its linear region when an ... | 03/22/2011 |
| 7773967 | Multi-mode—multi-band direct conversion receiver with complex I and Q channel interference mitigation processing for cancellation of intermodulation products A Multi-mode-multi-band direct conversion receiver with complex I and Q channel interference mitigation processing for cancellation of intermodulation products (IMPs) are described. In one embodiment, a method comprising over sampling of the entire receiver passband... | 08/10/2010 |
| 7729679 | Dynamic bandwidth filter for an FM receiver In an apparatus, method, and system for reducing interference with an input signal to an FM receiver, a plurality of inputs are filtered by a first stage of filters. The outputs are received by an interference detector and further processed by a second filtering sta... | 06/01/2010 |
| 7706769 | Adaptive intermodulation distortion filter for zero-if receivers A zero-IF receiver includes an adaptive filter that is enabled when intermodulation distortion is detected. The adaptive filter is configured as a notch filter that is centered at the location of the second-order intermodulation distortion, which, in a zero-IF recei... | 04/27/2010 |
| 7640000 | Apparatus and method for cancellation of partially overlapped crosstalk signals The present invention is related to a partially overlapped single-carrier crosstalk signal cancellation method and an apparatus using the same. For this purpose, the present invention provides a crosstalk canceller including a pre-processor for frequency down-shifti... | 12/29/2009 |
| 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 the second terminal to the third terminal changes on the basis of the... | 08/04/2009 |
| 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 first communication channel in which the power level of the channel at ... | 10/21/2008 |
| 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 differential signal components, a second input which receives a different... | 10/07/2008 |
| 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 conventionally mixed and demodulated to extract useful signal information with enh... | 10/07/2008 |
| 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 first signal with respect to a like characteristic of the second sign... | 08/12/2008 |
| 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. ... | 08/12/2008 |
| 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 processing of the wireless signal. Other embodiments include systems and m... | 07/01/2008 |
| 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 subtraction is calculated on the basis of an arctangent function. An unwrap f... | 06/24/2008 |
| 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 and a contribution from a lower power signal. It is first determined ... | 06/17/2008 |
| 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 empirical equation which includes at least one or more of the factors IP3˜IP... | 05/27/2008 |
| 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 to force the mixer to operate well within its linear region when an ... | 05/27/2008 |
| 7373116 | High output power radio frequency integrated circuit A high output power radio frequency integrated circuit (RFIC) includes an up-conversion module, a plurality of power amplifier input stages, and a plurality of integrated circuit pads. The up-conversion module is coupled to convert a low intermediate frequency (IF) ... | 05/13/2008 |
| 7349502 | Digital communication system and method for operating the system which can improve equalization performance according to channel state A digital communication system having an improved equalization performance according to a channel state and a method for operating the system are disclosed. The digital communication system includes: a channel state judging section; and an equalizing section for com... | 03/25/2008 |
| 7342529 | Analog-to-digital-converting and suppressing system A system for converting analog wanted signals to digital wanted signals includes an analog filter, an analog-to-digital-converter, and a compensator. The analog filter at least partly suppresses both the analog wanted signals and analog unwanted signals. The compens... | 03/11/2008 |
| 7336744 | Digital baseband receiver including a cross-talk compensation module for suppressing interference between real and imaginary signal component paths A digital baseband (DBB) radio frequency (RF) receiver used for receiving and processing a wireless communication signal. The DBB RF receiver includes a demodulator, an analog to digital converter (ADC) and a digital cross-talk compensation module. The demodulator o... | 02/26/2008 |
| 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 second polarity input terminal and the output terminal. A first input r... | 02/05/2008 |
| 7323883 | Phase measurement device, method, program, and recording medium When a signal having two or more frequency components is fed to a circuit to be measured, a phase of the signal output from the circuit to be measured is measured. A phase measurement device measures an output when an input signal having two input frequency componen... | 01/29/2008 |
| 7324494 | Reception device and reception method A spreading code determining section (107) determines which spreading code is multiplexed in a received signal that has been received by an antenna (101) and has gone through a radio receiver (102), a correlation processing section (103),... | 01/29/2008 |
| 7319849 | Radio-frequency tuner with differential converter A system for tuning a radio-frequency signal includes a first input path, a second input path, a common reference generator, a selector, a mixer, and a filter. The first input path and the second input path propagate a first single-ended input signal and a second si... | 01/15/2008 |
| 7317931 | Transmission rate changes in communications networks A communications network including first and second stations, the first station comprising a transmitter and the second station comprising a receiver. The network further including a transition control portion which is operable, prior to a change in a transmission r... | 01/08/2008 |
| 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 unwanted differential mode noise that coupled onto the differential s... | 01/01/2008 |
| 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 phase information, a carrier detector which detects presence or absenc... | 11/27/2007 |
| 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 systems. The basic idea of this invention is to optimise space-only proc... | 11/27/2007 |
| 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 determining a frequency offset of the interference with reference to the operat... | 11/13/2007 |
| 7269234 | Arrangement for dynamic DC offset compensation A digital arrangement for selecting a channel coefficient and DC estimate comprises a demultiplexer receiving a digital input signal splitting the digital input signal into a first and second signal, a first joint detection unit receiving the first signal generating... | 09/11/2007 |
| 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 transceiver employs numerous digital signal processing (DSP) techniques to ... | 08/14/2007 |
