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7415250 |
Distortion compensating amplifier
Disclosed is a distortion compensating amplifier having a distortion compensator for compensating for distortion of an amplifier by updating distortion compensation coefficients so as to null a...
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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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7412007 |
High efficiency ultra wideband generator
A method and system to produce a spectrally filtered ultra wideband (UWB) signal preferably utilizing a singly terminated filter having an input section and a current switching device directly...
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7412006 |
Method and apparatus for RF carrier feedthrough suppression
A method includes performing a search method to determine a pair of receiver path correction signals, performing the search method to determine a pair of transmitter path correction signals, and...
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7409194 |
Calibrating an RF transmitter
A method for calibrating a radio frequency (RF) transmitter begins by mixing a modulated RF signal with an in-phase (I) component of a local oscillation or a quadrature (Q) component of the local...
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7409193 |
Predistortion circuit for a transmit system
Systems and methods related to amplifier systems which use a predistortion subsystem to compensate for expected distortions in the system output signal. A signal processing subsystem receives an...
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7409011 |
Systems and methods for the dynamic range compression of multi-bearer single-carrier and multi-carrier waveforms
The present invention is related to methods and apparatus that can advantageously reduce a peak to average signal level exhibited by single or by multicarrier multibearer waveforms. Embodiments of...
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7409010 |
Method and system for transmitting signals with reduced spurious emissions
An RF power amplifier architecture minimizes spurious emissions by breaking the transmitted signal into narrow spectrum sub-bands, amplifying each separately, and then combining the signals for...
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7409009 |
Method and apparatus of peak-to-average power ratio reduction
A technique of reducing the Peak-to-Average Power Ratio (PAPR) of Multi-Carrier (MC) modulated signals in which peaks in the baseband signal that lie above a threshold amplitude are detected and...
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7409008 |
Transmitting arrangement for mobile radio
A transmitting arrangement, in particular for mobile radio, has a quadrature modulator with an upstream, digital signal processing unit. In order to suppress side bands and the carrier frequency,...
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7409007 |
Method and apparatus for reducing adjacent channel power in wireless communication systems
This invention relates to a method and apparatus for reducing adjacent channel power in wireless communication systems. More particularly, the present invention is directed to a system for...
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7406132 |
Pre-equalizer, VSB transmission system using the same, and transmission method thereof
Disclosed is a pre-equalizer, a vestigial sideband (VSB) transmission system using the pre-equalizer, and a VSB transmission method. A first transmit signal is stored in a first memory, and a...
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7406117 |
XDSL multi-hybrid modem with power spectral density shaping
Power spectral density shaping can be used in an XDSL system in order to adjust power spectral density properties of signals transmitted by an XDSL modem. The XDSL modem may include a power...
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7403573 |
Uncorrelated adaptive predistorter
An uncorrelated adaptive predistorer configured for use with an RF power amplifier having an input loop configured to be coupled to the input of the RF power amplifier an output loop coupled to the...
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7403572 |
Method of preventing interferring signal transmission of electronic products
A method of preventing interference of signals transmitted from electronic input devices to a computer host. An identification is generated for each individual electronic device. A receiving unit...
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7400864 |
Method and apparatus for compensating for phase variations caused by activation of an amplifier
A method and apparatus that reduces the amount of constellation rotation due to power amplifier (PA) insertion phase variation during activation (i.e., turn on) of a transmitter. This is...
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7397863 |
Implementation technique for linear phase equalization in multi-mode RF transmitters
The present invention implements an architecture that changes the sequence of digital processing so that equalization occurs prior to phase accumulation. A phase differentiator receives an envelope...
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7394880 |
Method and apparatus for simulating radio channel
A radio channel simulator configured to read radio channel data describing a radio channel and user data including at least one user signal, and to simulate the radio channel using a FIR filter...
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7394754 |
System and method for transmitting data in a multiple-branch transmitter-diversity orthogonal frequency-division multiplexing (OFDM) system
A system and method for transmitting data in multiple-branch transmitter-diversity OFDM systems is presented. In one embodiment, an approach is taken where an inverse Fourier transform (IFT) is...
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7392020 |
Table reference type predistorter
The purpose of the present invention is to compensate the distortion of an amplifier by a predistorter which compensates the distortion of a power amplifier even when a frequency amplitude...
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7391713 |
Phase rotation technique to reduce Crest Factor of multi-carrier signals
A technique for Crest Factor reduction of multi-carrier signals using phase rotation is described. The multi-carrier signal could be in digital baseband, analog baseband, or analog RF (radio...
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7389093 |
Call method, call apparatus and call system
A call apparatus, a call method and a call system, are disclosed, in which the problem otherwise caused by fixed setting of the sound volume level of the BGM or the effect sound with respect to the...
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7388928 |
OFDM pre-equalizing
For example in case of an OFDM multicarrier transmission system the transmission characteristics of subcarriers of a multicarrier transmission system using a plurality of antenna elements ( 3, 3...
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7388926 |
Quadrature modulation system
A disclosed quadrature modulation system inputs an inphase signal component and an orthogonal signal component, and outputs an output signal that is quadrature modulated by a quadrature modulator....
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7386060 |
Method of reducing a peak-to-average power ratio
The present invention relates to a method of reducing a peak-to-average power ratio of a signal to be transmitted. The method comprises the steps of detecting a portion of the signal being above a...
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7385541 |
Power amplifying apparatus, power combining system and delay measuring method for power combining system
A power amplifying apparatus includes a distributing unit that divides an input digital signal to a plurality of the input digital signals so as to distribute the input digital signals to a...
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7383028 |
Timing adjustment method for wireless communication apparatus
The linearity of a transmission signal is improved in a wireless communication device by adjusting a delay difference between paths of two signals that are combined into one after modulation...
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7382835 |
Power booster using peak suppression and pre-distortion for terminal radios
A technique to boost the output power of portable radio terminals without increasing the power dissipation is described. The input to the terminal transmit amplifier is modified by a...
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7382834 |
Phase rotation estimation
Apparatus, systems, and methods implementing techniques for estimating a relative rotation between a first complex signal and a second complex signal. The first complex signal is quantized to...
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7382833 |
System for phase, gain, and DC offset error correction for a quadrature modulator
A quadrature modulator compensation system for compensating the transmission of a source signal includes a transmitter which uses a transmitter input signal to generate a transmitter output....
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7379715 |
Transmitter apparatus and method using polar modulation with signal timing adjustment
A transmitting apparatus includes a polar signal producing circuit which produces signals corresponding to the amplitude and the phase of a transmitting modulated wave from an input signal and...
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7376358 |
Location specific optical monitoring
An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and...
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7376202 |
OFDM peak-to-average power ratio reduction by combined symbol rotation and inversion with limited complexity
A signal scrambling method based on combined symbol rotation and inversion (CSRI) for the peak-to-average power ratio (PAPR) reduction of OFDM signals. By dividing OFDM sequences into subblocks and...
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7376201 |
System and method for reducing crest factor of signal
A new system and method is developed for reducing the crest factor of a signal. The system includes a large signal extraction module for receiving the input signal and the magnitude of the input...
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7376200 |
Method and apparatus for suppressing carrier leakage
A method and system for determining at least one DC offset compensation value used to suppress carrier leakage occurring on real and imaginary signal paths in an analog radio transmitter when a...
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7376197 |
Signal peak reduction circuit for non-constant envelope modulation signals
Circuits for reducing the signal peaks in telecommunications signals are described. The circuits and methods are preferably adapted for reducing the peak to average power ratio of non-constant...
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7376192 |
Delta modulation for channel feedback in transmit diversity wireless communication systems
A method is described herein for reducing the number of feedback bits needed to send channel state information over a feedback channel from a receiving unit (e.g., mobile terminal, base station) to...
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7372918 |
Transmission device with adaptive digital predistortion, transceiver with transmission device, and method for operating a transmission device
The invention provides a transmission device having adaptive digital predistortion, which has a transmission path and a feedback path. The transmission path contains a predistortion unit which...
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7372917 |
Digital algorithm for on-line ACPR optimization in polar RF transmitters
An RF transmitter includes a digital processor that includes a time shift signal determination block that produces a time shift signal based upon a bleed over power level in an adjacent channel...
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7369813 |
Fast calibration of electronic components
The number of measurements needed to calibrate an electrical device is reduced. Apparatus and methods minimize output of one or more unwanted signals by determining a calibration setting, in a...
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7366252 |
Wideband enhanced digital injection predistortion system and method
A system for linearizing RF amplifiers employing baseband predistortion techniques provides additive or multiplicative predistortion of the quadrature (I/Q) input signal. The predistorter uses a...
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7366230 |
Power control in mobile radio communications systems
A power control unit ( 500 ) for a power control system in a mobile communication system, the power control unit ( 500 ) comprising an inner power control loop element ( 503, 507 ), which generates...
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7362819 |
Device and method for reducing peaks of a composite signal
A method of limiting at least one peak of a composite signal having multiple carriers signals involves placing energy in at least one bandwidth gap located between respective frequency bandwidths...
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7362818 |
Amplitude and phase comparator for microwave power amplifier
A predistortion power amplifier architecture has a power amplifier which receives an input via an amplitude modulator and a phase modulator. A sample of the output of the amplifier and a sample of...
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7362816 |
Inversion of channel distortion by adaptive wavelet lifting
A method for inverting telecommunication channel distortion by adaptive wavelet lifting. The distortion signal is analyzed using wavelet lifting and the inverse filter is computed. Coefficients of...
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7362803 |
Method and system for interactive channel equalization
A method and system for interactive channel equalization uses channel status information included in data packets. The system includes a first station adapted to transmit a first data packet...
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7359683 |
Predistorter for use in a wireless transmitter
A wireless radio frequency (RF) transmitter includes a power amplifier and a predistorter for injecting a distortion signal into an RF signal prior to amplification for use in linearizing the power...
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7359680 |
Delay calibration in polar modulation transmitters
A method and apparatus for dynamically compensating for delay mismatch between a supply signal and an input signal of a power amplifier in polar modulation transmitters. One exemplary polar...
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7359453 |
System and method for transitioning between modulation formats in adjacent bursts triggering on ramps
A modulation system and method are provided for transitioning between modulation formats in adjacent transmit bursts. The modulation system includes a data interface, first modulation circuitry...
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7359437 |
Encoding method and system for reducing inter-symbol interference effects in transmission over a serial link
A communication system including a transmitter, a receiver, and a serial link, in which encoded data (e.g., encoded video data and encoded auxiliary data) are transmitted from the transmitter to...
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