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7627294 |
Radio transmitter front-end with amplitude and phase correction and methods for use therewith
A radio transmitter front-end for use in a voice data and RF integrated circuit (IC) includes a phase correction module that produces a phase adjusted signal in response to a phase modulated signal...
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7627293 |
Strategic predistortion function selection
A corrective predistortion function is applied to a signal to compensate for or cancel out distortion that is introduced by a component that processes the signal. A disclosed example includes...
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7620373 |
Apparatus and method for calibration of gain and/or phase imbalance and/or DC offset in a communication system
A radio frequency transceiver for off-line transmit and receive calibrations includes: a transmit pre-distortion module configured to receive a transmit calibration signal during a transmit...
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7613250 |
Distortion compensation apparatus
Provided is a distortion compensation apparatus which can correspond to the number of carriers adaptively. The apparatus includes a distortion compensation processing circuit multiplying an input...
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7610058 |
Reverse loop protocol
It is possible to operate a wireless system, such as a CDMA system, in a more efficient manner by employing a statistical approach for setting power targets for reverse loop transmission. Unlike...
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7610028 |
Method and system for reduction of peak-to-average power ratio of transmission signals comprising overlapping waveforms
The present invention provides a method and system for reducing the peak to average power ratio (PAP) of a signal with low computational complexity. According to one embodiment, the present...
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7603089 |
Methods and apparatus for conditioning low-magnitude events in communications signals
Methods and apparatus for conditioning low-magnitude events in electrical signals. According to an exemplary method, a low-magnitude event occurring in a signal trajectory of a received electrical...
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7599669 |
Transmitting arrangement, transreceiver with a transmitting arrangement and method for signal processing
A transmitting arrangement includes a first signal input for supplying a frequency modulation signal, a second signal input for supplying an amplitude modulation signal, a phase-locked loop and an...
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7599420 |
System and method for distributed input distributed output wireless communications
A system and method are described for compensating for frequency and phase offsets in a multiple antenna system (MAS) with multi-user (MU) transmissions (“MU-MAS”). For example, a method...
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7593699 |
Distortion/efficiency adaptation in a variable-data-rate radio transmitter
The present invention generally speaking, provides for adaptive control of an RF power amplifier in view of a desired data rate. For low data rates, the RF amplifier ( 121 ) is controlled so as to...
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7590395 |
Power management scheme for software-defined radios
A power management system is provided for a software-defined radio. The power management system includes: an antenna; a regulated power supply; a power amplifier; and a digital signal processor. A...
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7590190 |
System and method for forward path gain control in a digital predistortion linearized transmitter
A system and method for controlling the gain in the forward signal path of a digital predistortion linearizer is disclosed. The loop gain of the predistortion system is driven to unity, where a...
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7586995 |
Peak windowing for crest factor reduction
In order to reduce the crest factor of a signal for power amplification, a windowing function is applied. The windowing function that is applied is a triangular windowing function. The use of this...
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7580686 |
Adaptive predistortion method and arrangement
An adaptive predistortion arrangement includes means ( 26, 40, 42, 44, 46 ) for up-converting a baseband signal (S 1 ) into an intermediate frequency signal (S 12 ) having frequency aliazing and...
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7577211 |
Digital predistortion system and method for linearizing an RF power amplifier with nonlinear gain characteristics and memory effects
A system and method of digitally predistorting a transmitter that has a digital input, up-converter, and a RF amplifier is disclosed. A digital predistorter preferably employs three paths for the...
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7574182 |
Mobile communications terminal having driving voltage control apparatus and method thereof
A mobile communication terminal including a power amplifier configured to amplify a power of a received signal and wirelessly transmit the amplified signal through an antenna, a high power detector...
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7573948 |
Radio transmitter incorporating digital modulator and circuitry to accommodate baseband processor with analog interface
A radio frequency (RF) transmitter includes a digital radio processor and a baseband processor. A complex analog-to-digital converter (ADC) within the radio processor provides an analog interface...
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7573410 |
Gain step calibration in a mobile cellular transmitter
A technique to utilize digital gain control to fine adjust gain for one or more analog gain steps of an analog circuit. A gain step calibration procedure is utilized to set the digital gain within...
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7570932 |
Dual mode quadrature radio frequency power amplifier
The present invention is a dual mode quadrature RF power amplifier system that is efficient and meets linearity requirements in both modes of operation. In a high power mode of operation, the power...
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7570931 |
RF transmitter with variably biased RF power amplifier and method therefor
An RF transmitter ( 30 ) includes an RF power amplifier ( 32 ) for which the power input bias voltage ( 40 ) and signal input bias voltage ( 80 ) are controlled within feedback loops. A peak...
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7570928 |
System and method for low delay corrective feedback power amplifier control
A system for controlling the power output of a power amplifier includes a power amplifier through which a transmit signal having an amplitude-modulated (AM) component and a phase-modulated (PM)...
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7570710 |
In-phase and quadrature-phase signal amplitude and phase calibration
In-phase (I) and quadrature-phase (Q) signals are corrected for both amplitude and phase imbalances by passing the I and Q signals successively through a first amplitude correction stage, a...
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7565116 |
High frequency module
A high frequency module comprises a layered substrate. Inside the layered substrate, a reception diplexer for processing reception signals and a transmission diplexer for processing transmission...
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7558541 |
Amplifier gain and phase stabilizer
Methods and apparatus are provided for stabilizing the phase and gain of an amplifier in a power pooling arrangement. A pilot signal combining a reference carrier frequency with a reference...
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7558539 |
Power control feedback loop for adjusting a magnitude of an output signal
A circuit for adjusting a magnitude of a transmit signal includes a transmitter ( 105 ), providing a transmit signal ( 107 ). It also includes a transmitter amplifier ( 109 ), receiving the...
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7555276 |
Devices, methods, and computer program products for controlling power transfer to an antenna in a wireless mobile terminal
A wireless mobile terminal includes an antenna, a power amplifier coupled to the antenna, a power detector coupled to an output of the power amplifier, a phase shifter coupled between the output of...
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7555270 |
Wide dynamic range power detection in a communication system
Power detection system and method provide for a wide dynamic range power detection. The system may incorporate a coupler to sample a transmitted or received power. Such sampled power is then...
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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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7551687 |
Distortion compensating apparatus
A distortion compensating apparatus for correcting the size of a distortion compensation coefficient in such a manner that a transmit signal that has undergone distortion compensation will not...
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7548591 |
Quadrature modulator and calibration method
A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the...
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7546098 |
Control system with selective open-loop operation
A control system may be selectively operated in open loop mode, for example, during data bursts. In a power control system, the transmitted power may be selectively held at a constant level, for...
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7542775 |
Control device and radio control method
A controller equipment includes a measuring unit for measuring channel qualities of a control channel and a user channel separated from a received signal, an updating unit for updating target...
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7542738 |
Method and apparatus for measuring and compensating for power amplifier distortion and non-linearity
A power amplification system includes functionality for measuring and compensating for distortion and non-linearity in a power amplifier (PA). The compensation process may be performed repeatedly...
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7539466 |
Amplifier with varying supply voltage and input attenuation based upon supply voltage
A radio frequency amplifier module ( 500 ) has a voltage monitor ( 546 ) that monitors an input supply voltage of an input power supply ( 534 ) and an adjustable power supply ( 512 ) that accepts...
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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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7536197 |
Apparatus and method of loop and rate dependent power cutback
Methods for reducing power required for transmitting a signal from a first transceiver to a second transceiver are described. The methods comprise the steps of estimating an excess amount of power...
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7535311 |
Direct wideband modulation of a frequency synthesizer
A frequency synthesizer modulates a signal by directly modulating a signal input to a voltage controlled oscillator (VCO) associated with the frequency synthesizer. The modulation signal has a...
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7535299 |
High-frequency amplification circuit
A resonance circuit comprising, for example, an inductor and a plurality of capacitors is provided as a load of a transistor. The capacitors are changed over by a switch. As the capacitors are...
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7529526 |
Apparatus and method for detecting radio frequency transmission power levels
An apparatus and method for detecting radio frequency transmit power levels produced by a power amplifier of a wireless device is described. In one exemplary apparatus implementation, the apparatus...
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7529524 |
Adaptive power amplifier linearization in time division duplex communication systems
In an aspect of the invention, a method is performed in a transceiver for adaptive power amplifier linearization in time division duplex communication systems. The method comprises, in response to...
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7526308 |
Adaptive control physical carrier sense parameters in wireless networks
Apparatuses and methods for determining and applying receiving sensitivity threshold and/or energy detection threshold values for one or more nodes of a wireless network cell are described herein.
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7526255 |
Method and system for coordinating radio resources in unlicensed frequency bands
A method and system is provided for coordinating radio resources in shared or unlicensed frequency bands. Specifically, a set of operating parameters and a receiver-transmitter feedback mechanism...
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7522892 |
Power amplifier with serial interface and associated methods
In a power amplifier, a serial bus interface is provided for sending and receiving information to other devices, such as a baseband controller. The power amplifier includes several control pins...
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7522672 |
Digital branch calibrator for an RF transmitter
The present invention provides a digital (computational) branch calibrator which uses a feedback signal sensed from an RF transmit signal path following the combining stage of LINC circuitry of a...
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7519337 |
Transmitter and mobile communication terminal using the same
A transmitter employing variable gain amplifiers and operating with both constant and nonconstant envelope modulation systems is contrived to suppress variation in the transmitting power when...
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7512387 |
Method and control system for controlling the output power of an RF amplifier system
A system for controlling a power supplied to a load from a radio frequency amplifier system includes a radio frequency signal generator adapted for generating a radio frequency signal, an amplifier...
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7505742 |
Battery life extending technique for mobile wireless applications using bias level control
An operating voltage applied to a transmitter's power amplifier in a mobile wireless transceiver is dynamically controlled so as to improve the efficiency of the transmitter at all output power...
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7502600 |
Dynamic bias for RF power amplifiers
A method for wireless communication that dynamically adjusts RF amplifier operating bias for the subscriber unit's transmitter in response to a power control signal. The invention provides...
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7502594 |
Power regulation feedback to optimize robustness of wireless transmissions
A wireless communication system with power regulation feedback for improving the robustness of wireless communication transmissions between a receiver and an active emitter irrespective of the...
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7499680 |
Translational loop transmitter architecture employing channel power ratio measurements for modulation accuracy calibration
A Radio Frequency RF transmitter includes a translational loop architecture that supports non-constant envelope modulation types and includes by adjusting the envelope of the translational loop at...
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