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| Number | Title | Issue Date |
| 7184722 | Maintaining constant power over a wide range of temperatures employing a power amplifier with adjustable current drain A system and method for transmitting data communications through air using a radio. The invention allows the user to select from a number of predetermined output transmission powers. When a lower output transmission power is selected the current drain to the associa... | 02/27/2007 |
| 7184714 | Frequency domain estimation of IQ imbalance in a wireless OFDM direct conversion receiver using loopback connection An OFDM transceiver has a transmitter, a receiver, and a loopback switch. The loopback switch configured is for selectively establishing a physical connection between an output terminal of the transmitter and an input terminal of the receiver. The transmitter is con... | 02/27/2007 |
| 7184490 | Low power distributed transmitter A low power distributed transmitter includes a signal generator, signal partitioning module, signal processing module, a plurality of amplifiers, and a transmitting module. The signal generator is operably coupled to generate a signal to represent base-band data in ... | 02/27/2007 |
| 7184491 | Wireless communication apparatus A linear system and an EER system are used in combination such that the EER system can also be used in a cellular phone with a wide output dynamic range. In the EER system, linear control of an amplifier becomes difficult in a low output range. Thus, use of the EER ... | 02/27/2007 |
| 7180439 | Multi-path digital power supply controller A multi-path digital power supply controller includes a first ADC (ADC1) coupled to the supply's output voltage Vout and arranged to provide an output which varies with Vout's low frequency components, and a second ADC (ADC2) coupled to Vo... | 02/20/2007 |
| 7177605 | Power amplification device, in particular for a cellular mobile telephone A power amplification device includes an input for receiving a signal having a useful or desired frequency band, and power amplification circuitry of the delta-sigma type connected to the input. The power amplification circuitry exhibits an order greater than or equ... | 02/13/2007 |
| 7177370 | Method and architecture for dual-mode linear and saturated power amplifier operation An RF transmitter provides both GSM and EDGE capability by implementing collector voltage control over the power transistor(s) in a power amplifier. During EDGE mode, linear base-biasing a power amplifier (PA) allows collector control to provide either saturated mod... | 02/13/2007 |
| 7177603 | Constant gain digital predistortion controller for linearization of non-linear amplifiers The invention is related to methods and apparatus for controlling and adapting a digital predistortion linearizer for amplification of bandlimited signals using non-linear amplifiers. The control method advantageously permits the predistortion function applied by a ... | 02/13/2007 |
| 7173484 | System and method of carrier reinjection in a feedforward amplifier A dual loop feedforward power amplifier. A dual loop feedforward power amplifier, comprising an input that provides a multicarrier signal; a first feedforward power amplifier; and a second feedforward power amplifier, wherein the first feedforward power amplifier se... | 02/06/2007 |
| 7173987 | Analog front end circuit The present invention relates to an analog front end circuit which is preferably used for taking out an image signal from a charge coupled device, that is used as image pickup means in an electronic camera such as an electronic still camera, a video camera and the l... | 02/06/2007 |
| 7173555 | Method and system for nonlinear and affine signal processing A method of nonlinear and affine signal processing includes the steps of introducing an input signal into a system which exhibits nonlinear behavior, the input signal including a target signal and a secondary signal. By virtue of its nonlinear design, the system gen... | 02/06/2007 |
| 7173961 | Frequency domain partial response signaling with high spectral efficiency and low peak to average power ratio The system includes a transmitter for generating a signal in the time domain and transforming the signal to the frequency domain, wherein the transmitter suppresses a plurality of sub-carriers of the signal, The resulting truncated signal is transmitted to the recei... | 02/06/2007 |
| 7170343 | Fast LUT predistorter for power amplifier A fast LUT predistortion apparatus and method for compensating nonlinear distortion of the high power amplifier HPA is disclosed. The apparatus includes a predistortion unit for predistorting an input complex digital signal based on a look up table LUT implementatio... | 01/30/2007 |
| 7170344 | Multi-band predistorter using power series representation A transmission signal containing signals of a plurality of frequency bands is divided and fed to a linear signal transfer path including a delay circuit and a plurality of distortion generation paths for the plurality of frequency bands. In each distortion generatio... | 01/30/2007 |
| 7170951 | Device and method for predistorting a transmission signal to be transmitted via a nonlinear transmission path A device for predistorting a transmission signal to be transmitted over a nonlinear transmission path comprises an estimator for determining an error signal depending on the transmission signal and a previously registered transfer characteristic of the nonlinear tra... | 01/30/2007 |
| 7170953 | Method and apparatus for a transceiver having a constant power output The present invention includes a transceiver and a method of operating the same that includes in the transmitter a power control circuit that operates on an analog differential signal containing data packets individually. The power control circuit initially transmit... | 01/30/2007 |
| 7171170 | Envelope limiting for polar modulators Envelope limiting for a polar modulator. A system is provided that intelligently compresses the amplitude modulation in a polar modulator so that it can be implemented with a single-stage variable gain amplifier. Limiting the amplitude modulation range on the low si... | 01/30/2007 |
| 7170342 | Linear power amplification method and linear power amplifier A combined signal of a digital pilot signal and a digital transmission signal is applied to a digital predistorter (20), wherein it is added with odd-order distortions based on a power series model to generate a predistorted signal, then the predistorted sign... | 01/30/2007 |
| 7167523 | Spacial derivative bus encoder and decoder A method and apparatus for providing efficient and accurate electronic data transmission of information on a data bus in the presence of noise. Data signals are received on a plurality of input lines by a spacial derivative encoder. The spacial derivative encoder en... | 01/23/2007 |
| 7167118 | Centered-pulse consecutive edge modulation (CEM) method and apparatus A centered-pulse consecutive edge modulation (CEM) method and apparatus provides a pulse output that advantageously exploits the full edge update rate of the CEM while providing substantially centered pulses. The method and apparatus also operate without substantial... | 01/23/2007 |
| 7161990 | Predistortion amplifier Unlike a prior art digital predistortion compensation device for determining a compensation coefficient based on absolute value information about a baseband complex input signal, the present invention performs distortion compensation calculation in accordance with a... | 01/09/2007 |
| 7162000 | Delay locked loop synthesizer with multiple outputs and digital modulation A delay locked loop circuit (200) in which multiple outputs are produced. A single delay line (24) is shared among multiple tap selection circuits (256A, 265B, 265C). Fixed phase shifts (412) can be introduced between multip... | 01/09/2007 |
| 7158765 | Method and apparatus for controlling power of a transmitted signal In the method and apparatus of controlling power of a transmitted communication signal, a communication signal is amplified and transmitted. At least one parameter on the transmitted signal is received, and a measure of interference with the transmitted signal is de... | 01/02/2007 |
| 7158489 | Data transmission in a TDMA system In TDMA systems it is possible to transmit data on more than one consecutive slot per frame. This introduces increased workloads on the power amplifier of the transmitter of the mobile station. To prevent the power amplifier from overheating, temperature sensing mea... | 01/02/2007 |
| 7158843 | Modular software definable pre-amplifier Pre-amplifier apparatus, for use for example in a home hi-fi system, compoosed of one or a plurality of reconfigurable circuits used to configure the apparatus to implement the desired audio processing functions and audio protocols for use in different audio systems... | 01/02/2007 |
| 7158582 | Digital I/Q modulator having a predistortion An I/Q modulator processes a time-discrete I/Q signal comprising an I component and a Q component. The I/Q signal is based on a sampling frequency which is equal to four times a carrier frequency of a carrier signal onto which the I/Q signal is modulated. A predisto... | 01/02/2007 |
| 7154308 | Driver circuit with gradual voltage ramp up and ramp down A driver circuit is disclosed comprising an amplifier, a data DAC, and a voltage control mechanism (VCM). During a power up sequence, the VCM provides gradually increasing voltage signals to the amplifier to cause a voltage at the output of the amplifier to increase... | 12/26/2006 |
| 7154978 | Cascaded delay locked loop circuit A delay locked loop frequency synthesizer in several embodiments uses a primary delay line element (24) and one or more secondary delay elements (162 . . . 164, 270, 310). In one embodiment, a main delay line (24) is used to coarsely select a fr... | 12/26/2006 |
| 7155229 | Distributed wireless architecture using microcast A mobile communication system comprises a plurality of cells, with each cell including a network of microstations distributed more or less uniformly throughout the cell. A central controller connected to the network of microstations selects a group of microstations ... | 12/26/2006 |
| 7155164 | Method and apparatus for performing transmit pre-emphasis A pre-emphasis circuit and methods are provided. The circuit includes a first amplifier and a second amplifier. The first amplifier is operable to amplify a signal using a first amplifier current, and the second amplifier is operable to amplify a delayed version of ... | 12/26/2006 |
| 7151405 | Estimating power amplifier non-linearity in accordance with memory depth Reducing a non-linearity effect of a power amplifier includes receiving signals at off-line inverse and forward models. The signals include an input signal, a pre-distorted signal, and an output signal. The output signal exhibits distortion with respect to the input... | 12/19/2006 |
| 7151740 | Transmit power control for an OFDM-based wireless communication system An open loop power control system for an orthogonal frequency division modulation (OFDM)-based fixed/mobile wireless system. A preferred system and method comprise measuring signal strength of received interference-free pilot tones transmitted by a base station; det... | 12/19/2006 |
| 7151913 | Electromagnetic wave transmitter, receiver and transceiver systems, methods and articles of manufacture The invention relates to a system for electromagnetic processing of an input wave involving receiving a modified signal derived from two or more signals that represent the input wave when combined; and regulating the modified signal using at least one characteristic... | 12/19/2006 |
| 7149257 | Digital predistortion system and method for correcting memory effects within an RF power amplifier A system and method of correcting memory effects present within power amplifiers using digital predistortion and an improved power amplifier system employing digital predistortion are disclosed. Nonlinearities within a power amplifier having an input derived from a ... | 12/12/2006 |
| 7149484 | Portable communication device having adjustable amplification and method therefor Briefly, in accordance with one embodiment of the invention, a portable communication device comprises an amplifier having an input signal and an output signal. The amplitude of the input signal may be compared to the amplitude of the output signal and an appropriat... | 12/12/2006 |
| 7145962 | Predistortion digital linearizer and gain controlling method thereof A predistortion digital linearizer is disclosed. The linearizer includes a predistorter for distorting a digital input signal in the digital domain to have an opposite characteristic to a nonlinear distortion characteristic of a high power amplifier, in accordance w... | 12/05/2006 |
| 7142615 | Distortion compensator A distortion compensator for compensating for distortion produced in an amplifier that amplifies a signal includes a signal level detector for detecting a level of a signal to be amplified and a distortion compensator for conducting distortion compensation based on ... | 11/28/2006 |
| 7142624 | Analog unidirectional serial link architecture The present analog invention is related to a unified digital architecture comprising logic transmitter portions and logic receiver portions. A unified serial link system and method for transmitting digital data across wired media including a transmitter and a receiv... | 11/28/2006 |
| 7139534 | Transmission circuit A transmission circuit includes: a modulated signal generator; a modulated signal line where an OFDM modulated wave flows; a detector; a phase component line for transmitting a phase component; an amplitude component line for transmitting an amplitude component; a l... | 11/21/2006 |
| 7139327 | Digital pre-distortion of input signals for reducing spurious emissions in communication networks Pre-distortion, whose magnitude—and preferably phase—are frequency-dependent, is applied to an input signal in order to reduce spurious emissions resulting from subsequent amplification of the signal. In preferred embodiments, the pre-distortion technique of the... | 11/21/2006 |
