Patent application number | Description | Published |
20090289678 | METHOD OF CONTROL SLOPE REGULATION AND CONTROL SLOPE REGULATION APPARATUS - A control loop has a control slope associated therewith. The control loop is provided to control a unit under control. A method of regulating the control slope comprises the step of measuring the control slope of the control loop and modifying a parameter associated with the unit under control in order to maintain the control slope within a desired range. Lock of the control loop is therefore maintained. | 11-26-2009 |
20100093298 | ADAPTIVE IIP2 CALIBRATION - A radio frequency transceiver ( | 04-15-2010 |
20100117824 | METHOD AND APPARATUS TO RECEIVE LOCATION INFORMATION IN A DIVERSITY ENABLED RECEIVER - A method of processing location information on a mobile device which includes a primary receiver for receiving a primary signal; a diversity receiver for receiving a diversity signal or location information; a diversity combiner which can combine primary and diversity signals to form a combined signal; and a first processing unit for processing the combined signal; the method comprising the steps of: identifying whether the device is in a location mode or a diversity mode; if the device is in location mode, disabling the diversity combiner; passing the output from the primary receiver directly to the first processing unit; and passing location information from the diversity receiver to a location processing unit. | 05-13-2010 |
20100167674 | INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR DETERMINING QUADRATURE IMBALANCE - An integrated circuit comprising processing logic for operably coupling to radio frequency (RF) receiver circuitry arranged to receive a wireless network signal. The receiver circuitry generates in-phase and quadrature digital baseband representations of the wireless network signal. The processing logic determines quadrature (I/Q) imbalance of the RF receiver circuitry based on the in-phase and quadrature digital baseband representations of the wireless network signal. | 07-01-2010 |
20100248658 | METHOD AND SYSTEM OF ADAPTIVE PREDISTORTION OF A WIRELESS TRANSMITTER - A method of adaptive predistortion of a power amplifier, characterised in that the method comprises the steps of: storing values of a plurality of corresponding first and second coefficients; selecting one of the stored first coefficients; processing a first signal with the first coefficient to produce an input signal for the power amplifier; amplifying the input signal in the power amplifier to produce an output signal; calculating an error value from the output signal and a previously selected first coefficient; selecting a stored second coefficient corresponding with the previously selected first coefficient; updating the previously selected first coefficient with a value calculated from the error value and the second coefficient; updating the second coefficient; and replacing the previously selected first coefficient and corresponding second coefficient with the updated first and second coefficients respectively. | 09-30-2010 |
20100298035 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL THEREIN - A wireless communication unit comprises a transmitter having a power amplifier and a feedback path operably coupled to the power amplifier. The feedback path comprises a coupler for feeding back a portion of a signal to be transmitted and a detector for detecting a power level of the fed back signal. A controller provides a ramp signal to the power amplifier that controls an amplitude characteristic of the signal to be transmitted. Averaging logic is operably coupled to the detector and arranged to average the detected power level over a first period. Comparison logic is operably coupled to the averaging logic and arranged to compare the average detected power level with a reference value. The controller is operably coupled to the comparison logic and arranged to scale a ramp signal applied to the power amplifier in response to the comparison. | 11-25-2010 |
20110136452 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL OF A POWER AMPLIFIER THEREFOR - A wireless communication unit comprising a transmitter having a power amplifier, a controller logic module arranged to control a power control value of the power amplifier and a closed loop control system operably coupled to the power amplifier and arranged to monitor a level of peak PA compression, wherein in response to the identified level of peak PA compression the controller logic module is arranged to automatically adjust a power amplifier power control value of the PA to obtain a predetermined level of peak PA compression. | 06-09-2011 |
20110159826 | WIRELESS COMMUNICATION UNIT, SEMICONDUCTOR DEVICE AND POWER CONTROL METHOD THEREFOR - A wireless communication unit comprises a transmitter comprising a power amplifier, an inner feedback power control loop having a power control logic module comprising loop priming logic module operably coupled to the power amplifier, and a switchable outer digital loop comprising switchable logic module. The loop priming logic module is arranged to set a power reference value for controlling the power amplifier prior to a ramping operation of the power amplifier and the switchable logic module switching the switchable outer digital loop on or off, thereby restricting adverse transient behaviour of the power amplifier. | 06-30-2011 |
20110201287 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL OF A POWER AMPLIFIER THEREFOR - A wireless communication unit comprises a transmitter having a forward path comprising a power amplifier, PA, and a feedback path arranged to feed back a portion of a signal output from the PA to a point in the forward path prior to the PA. The forward path and feedback path form a constant gain tracking (CGT) loop. The feedback path comprises an adaptive predistortion logic module located outside of the CGT loop and arranged to form an APD loop with the forward path and feedback path. The CGT loop comprises a controller logic module arranged to determine a gain offset of a signal routed through the forward path and feedback path and in response thereto set a drive level of the PA. | 08-18-2011 |
20110261903 | WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL OF A POWER AMPLIFIER THEREFOR - A wireless communication unit comprises a transmitter having a forward path comprising a power amplifier, PA, and a feedback path operably coupled to the power amplifier, wherein the feedback path comprises a coupler arranged to feed back a portion of a signal to be transmitted and a controller logic module arranged to control a power control value of the power amplifier, such that the forward path and feedback path form a closed loop power control. The controller logic module is arranged to determine a gain variation in the transmitter and provide attenuation to a transmit signal passing therethrough on a transmit slot by transmit slot basis and instruct a power backoff where necessary. | 10-27-2011 |
20120015616 | ADAPTIVE IIP2 CALIBRATION - A radio frequency transceiver ( | 01-19-2012 |
20140269852 | RADIO FREQUENCY TRANSMITTER NOISE CANCELLATION - Transmitter noise cancellation may be applied on a channel by channel basis to active channels of an incoming radio frequency signal received at a receiver. A noise cancellation filter may be provided for each active channel in a predetermined signal band. Applying noise cancellation on a per active channel basis instead of to the entire receive band may substantially reduce the filtering requirement and number of filter coefficients or taps to save power and reduce manufacturing costs. Channelized transmitter noise cancellers, multi transmitter-receiver cross coupling cancellers, and hybrid full signal band and channelized transmitter noise cancellers are also provided. | 09-18-2014 |
20140269858 | TRANSMITTER NOISE CANCELLATION IN A MULTI TRANSMITTER-RECEIVER SYSTEM - In a multi transmitter-receiver system, transmitter noise cancellation may be applied selectively for certain transmitters by exploiting asymmetries of the system. Hence, observation receiver(s) numbering less than the number of transmitters may be provided saving space and cost. Each observation receiver may selectively couple to a transmitter path and estimate the leakage noise from that transmitter. Based on the estimated leakage noise, noise cancellation may be applied to corresponding receiver path(s). Selection of the transmitters for leakage estimation may be based on system conditions at that time, which may be known to the system or may be estimated dynamically. | 09-18-2014 |
20140269970 | ALL DIGITAL TRANSMITTER NOISE CORRECTION - An all digital model of nonlinear transmitter signal distortion in signals received at a receiver of a transmitter-receiver may be used to estimate distortion. The estimated distortion may then be cancelled from the received signals to improve signal quality of the received signal. The digital nonlinear model may be part of an estimator circuit that estimates nonlinear distortion terms by applying a formula or transformation to a digitized version of the signals transmitter at a transmitter of the transmitter-receiver. A mixer may be used to shift a frequency of the estimated nonlinear terms away from a transmitter frequency so that the nonlinear terms can later be subtracted from the incoming signal received at the receiver at a receiver frequency. Circuits and methods are provided. | 09-18-2014 |
20140362949 | REDUCED BANDWIDTH DIGITAL PREDISTORTION - A predetermined nonlinearity may be introduced between a digital predistorter and a power amplifier of a RF transmitter. The nonlinearity may be applied to an output of a digital predistorter. The application of the nonlinearity to the predistorter output may expand a bandwidth of the predistorter output from a first lower bandwidth to a higher second bandwidth of the power amplifier that may be needed to support a predetermined data transfer rate at the RF transmitter. Introducing this nonlinearity between the predistorter and the power amplifier may reduce the sampling rate and power requirements of components included as part of a predistortion device. As a result less noise may be generated and less power may be consumed, resulting in smaller, more efficient, and more accurate predistortion and/or RF transmission systems. | 12-11-2014 |
20150055732 | POWER AMPLIFICATION SYSTEM, DEVICE AND METHOD - Embodiments of the present invention may include power amplifier architectures and systems for use in wireless communication systems. The systems may include a first circuit path for receiving an input signal and decomposing the signal into two vector signals using an out-phasing generator, modifying the vectors based on predetermined value limit, amplifying the vectors using power amplifiers, and combining the vectors to provide an amplified output. The system may include a second circuit path for generating an estimate of an envelope of the input signal and using the envelope to modulate the voltage supplies of the power amplifiers when amplifying the vector signals. The system may also include a feedback path for sending information regarding the envelope of the input signal into the out-phasing generator, which may modify the vector signals in response thereto. | 02-26-2015 |
Patent application number | Description | Published |
20080299923 | Wireless Subscriber Communication Unit and Method of Power Control with Back-Off Thererfore - A wireless subscriber communication unit comprises a transmitter having a power amplifier and a feedback power control loop having a power control function arranged to set an output power level of the power amplifier. The power control function is arranged to perform a back-off of the output power prior to completion of a transmission burst. | 12-04-2008 |
20080310552 | Ramping in Multimode Transmitters Using Primed Filters - A modulation system can switch between two modulation modes. In order to comply with limits on peak power in spectral bands outside the RF operating one the transmitter is required to ramp down to a condition of minimal power. To avoid fixed ramping and trailing bits, the transmitting signal is subjected to FIR filtering. The two FIR filters are primed with a sequence using a parallel input mode before serially entering the information data. | 12-18-2008 |
20110195672 | INTEGRATED CIRCUITS, COMMUNICATION UNITS AND METHODS OF CANCELLATION OF INTERMODULATION DISTORTION - A wireless communication unit includes a transmitter for processing a baseband transmit signal to produce a first radio frequency signal. A receiver is arranged to convert a second radio frequency signal to a baseband receive signal, where the receiver has a summation module arranged to add a cancellation signal to the baseband receive signal. A selectivity element is arranged to couple the transmitter and the receiver to an antenna, where a reduced portion of the first radio frequency signal is introduced into the second radio frequency signal thereby creating a second order inter-modulation distortion component in the baseband receive signal. An adaptive estimator module has a filter for filtering the baseband receive signal to remove dc offsets associated with the second order inter-modulation distortion component and generate the cancellation signal based on the baseband transmit signal and the filtered baseband receive signal for inputting to the summation module. | 08-11-2011 |
20110195673 | INTEGRATED CIRCUITS, COMMUNICATION UNITS AND METHODS OF CANCELLATION OF INTERMODULATION DISTORTION - A wireless communication unit includes a transmitter, a receiver, a selectivity element and a baseband processing module. The receiver has at least one summation module arranged to add a cancellation signal to the quadrature baseband receive signal. a baseband processing module arranged to: receive the quadrature baseband transmit signal and quadrature baseband receive signal; apply independent gain and phase adjustments to quadrature portions of the quadrature baseband transmit signal, based on at least one signal component of the quadrature baseband receive signal, to form independent cancellation signals; and apply the independent cancellation signals to the at least one summation module. | 08-11-2011 |
20120314784 | INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR QUADRATURE POWER DETECTION - An integrated circuit for a wireless communication unit has a transmit power control system employing a quadrature (I/Q) based power detector having at least one reference path and at least one detector path. The integrated circuit includes: a first quadrature error determination module for determining a quadrature error of a transmit signal and a second quadrature error determination module for determining a quadrature error of a detector signal input to the at least one detector path; a first quadrature balancing module arranged to correct for quadrature error of the transmit signal and output a reference signal to the at least one reference path; a second quadrature balancing module arranged to correct for quadrature error of the reference signal input to the at least one reference path, and a third quadrature balancing module arranged to correct for quadrature error of the detector signal input from the at least one detector path. | 12-13-2012 |