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| Number | Title | Issue Date |
| 7852968 | Method and apparatus for optimizing transmitter power efficiency A peak to average power ratio signal is generated from a first mapping function that selects the peak to average power ratio signal that corresponds to the data rate or data format of the signal to be transmitted. The selected peak to average power ratio signal is s... | 12/14/2010 |
| 7852967 | Automatic power output control circuit This invention includes a gain control section 13 capable of changing an APC loop gain according to a power output level set in a power amplifier to allow suppression of variation in power output level when the power output level is low and suppression of occ... | 12/14/2010 |
| 7848452 | Distortion compensating apparatus A distortion compensating apparatus has an IQ imbalance compensation coefficient arithmetic circuit 31 for calculating, from correlation values of a transmission signal and a feedback signal, IQ imbalance compensation coefficients for compensating for IQ imba... | 12/07/2010 |
| 7839951 | Dynamic crest factor reduction system A system and method for performing digital crest factor reduction. In one embodiment, the method is devised to suppress the signal amplitude to maintain a low signal peak to average ratio (PAR), while maintaining a desirable Error Vector Magnitude (EVM). This techni... | 11/23/2010 |
| 7830981 | Method and system for minimizing power consumption in a communication system A method and system for minimizing power consumption in a communication system is provided. The method may include adjusting the supply voltage of a linear amplifier, which may be used for amplifying a RF signal, in proportion to the envelope of the baseband of the ... | 11/09/2010 |
| 7830980 | System and method capable of implicit feedback for the devices with an unequal number of transmitter and receiver chains in a wireless local area network An embodiment of the present invention provides a wireless station (STA) capable of implicit feedback in a wireless local area network, comprising at least one power amplifier, a plurality of antennas capable of being connected with said at least one power amplifier... | 11/09/2010 |
| 7826554 | Digital transmitter In a digital Cartesian modulation transmitter, an encoder generates 1-bit logic signals from in-phase and quadrature signals. A single bit digital modulator multiplexes the 1-bit logic signals for Cartesian I/Q modulation. A digital upconverter (DUC) upconverts the ... | 11/02/2010 |
| 7792213 | Minimum IQ value limiting Embodiments of a multi-point push-out method are disclosed for a more accurate adjustment of minimum IQ values in order to maintain better continuity in the IQ trajectory for sampled IQ values near the origin. IQ trajectories near the origin are limited to a minimum... | 09/07/2010 |
| 7792214 | Polar modulation transmitter circuit and communications device Provided is a transmitter circuit capable of operating with low distortion and high efficiency even in a modulation method using wide modulation bandwidth. In the transmitter circuit, a signal generation section (11) generates an amplitude signal and an angle... | 09/07/2010 |
| 7787566 | Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios A power management system and method for a wireless communication device generates an average desired transmit power signal based on at least one of a received signal strength indicator signal and a power control instruction signal from a base station. A power suppl... | 08/31/2010 |
| 7787565 | System and method for performing baseband phase shifting in a Cartesian feedback system A system and method for performing baseband phase shifting in a Cartesian feedback system includes a forward path for receiving an input baseband signal having two components, and performing up-conversion to output a RF signal; a power amplifier for amplifying the R... | 08/31/2010 |
| 7787563 | Transmitter for wireless applications incorporation spectral emission shaping sigma delta modulator A transmitter employing a sigma delta modulator having a noise transfer function adapted to shift quantization noise outside at least one frequency band of interest. A technique is presented to synthesize the controllers within a single-loop sigma delta modulator su... | 08/31/2010 |
| 7787564 | Combined peak reduction equalizer and phase/amplitude pre-distortion A technique for a combined peak reduction equalizer filter and phase/amplitude pre-distortion is described. The input to a transmitter chain is modified by a combined equalizer filter and pre-distorter, prior to being applied to the transmitter chain. The equalizer ... | 08/31/2010 |
| 7782979 | Base-band digital pre-distortion-based method for improving efficiency of RF power amplifier The present invention relates to a BDPD-based method for improving efficiency of RF power amplifier, comprising: first, choose key neural network architecture and scale and input initial values of modeling data and network parameters necessary for establishing the n... | 08/24/2010 |
| 7778352 | Digital compensation for nonlinearities in a polar transmitter A polar transmitter includes a digital processor coupled to receive a complex modulated digital signal and a feedback signal produced from the complex modulated digital signal and that is operable to compare the complex modulated digital signal to the feedback signa... | 08/17/2010 |
| 7778353 | Controller for a radio-frequency amplifier A controller for an RF amplifier, in particular for an RF amplifier of an MR tomograph, contains an RF control element that finely adjusts an RF signal requiring to be fed to the RF amplifier in magnitude and phase using LF control parameters of a control element re... | 08/17/2010 |
| 7778351 | Tunable CMOS receiver apparatus A CMOS receiver system having a tunable receiver having a tunable gain and a bandwidth system is provided. The tunable receiver includes means for receiving input signals; and a control circuit controlled by a control signal for tuning at least one of the gain and t... | 08/17/2010 |
| 7773692 | System and methods for digitally correcting a non-linear element using a digital filter for predistortion System and methods for a digital linearization of a non linear element. Digital predistortion methods and circuitry for linearizing a non-linear element that address long or “memory” effects and shorter duration effects, these two predistortion functions are ope... | 08/10/2010 |
| 7760816 | Automatic gain control using multiple equalized estimates dynamic hysteresis At least one adjustable gain analog amplifier (120, 124 and 128) in an analog line-up (102) amplifies by a gain an analog signal at an input of the analog line-up (102). The at least one adjustable gain analog amplifier (120, 124 a... | 07/20/2010 |
| 7751496 | 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 the steps of receiving a modified signal derived from two or more signals that represent the input wave when combined; and regulating the modified signal using a digital sign... | 07/06/2010 |
| 7742541 | Transmission circuit, and communication apparatus using the same A compact transmission circuit for outputting a highly linear transmission signal regardless of the output power level and operating at a high efficiency is provided. A signal generation section 11 generates an amplitude signal and quadrature data based on in... | 06/22/2010 |
| 7738594 | Method to maintain RF power amplifier linearity in varying load VSWR conditions without isolator The peak-to-average power ratio at the output of an rf power amplifier is detected and compared with, for instance, an ideal ratio. The result of this comparison is used to control the amplifier, particularly to reduce distortion in the output signal. ... | 06/15/2010 |
| 7733979 | Average power control of wireless transmission having a variable duty cycle A method an apparatus for controlling a transmission signal power level of a transmitter is disclosed. The method includes receiving a root-mean-squared target power level. A duty cycle of a transmission signal is determined that indicates power on and power off per... | 06/08/2010 |
| 7733978 | Apparatus and method of dynamically adapting the LUT spacing for linearizing a power amplifier A digital adaptive predistorter look up table (DAPD-LUT) technique dynamically adapts a look up table (LUT) an LUT spacing for linearizing a power amplifier (PA). It optimizes the LUT spacing for the PA without prior knowledge of system state information. A size-N L... | 06/08/2010 |
| 7729445 | Digital outphasing transmitter architecture Architectures including digital outphasing transmitters. Digital signal generation circuitry generates at least two base-band sinusoid signals. Bandpass modulation circuitry is coupled to receive the base-band sinusoid signals and generates at least two modulated di... | 06/01/2010 |
| 7729446 | System and method for digitally correcting a non-linear element using a multiply partitioned architecture for predistortion Digital predistortion system, methods and circuitry for linearizing a non-linear element using a multiply partitioned architecture that first addresses long or “memory” effects, and separately addresses shorter duration effects. These blocks or circuits are oper... | 06/01/2010 |
| 7724840 | RF transmitter with predistortion and method therefor An RF transmitter (10) includes a linear predistorter (22) and a nonlinear predistorter (24) which together drive analog transmitter components (14). The linear and nonlinear predistorters (22, 24) are implemented using a collectio... | 05/25/2010 |
| 7720175 | Apparatus and method for reducing peak-to-average power ratio in an OFDM communication system A Peak-to-Average Power Ratio (PAPR) reduction apparatus and method in an OFDM communication system are provided. In the PAPR reduction method, magnitude and phase components are extracted from transmission sample data. Peaks having magnitude components exceeding a ... | 05/18/2010 |
| 7711070 | Method and apparatus for control of transmitter power consumption A method and apparatus improve the design and control of amplification stages in a radio frequency (RF) transmitter, so as to reduce its power consumption. In some aspects, the transmitter is operable to transmit an output RF signal at a target power level, which ma... | 05/04/2010 |
| 7684513 | Amplifier circuit and amplifying method An amplifying method and apparatus generates a plurality of constant envelope signals from an input signal and generates a plurality of pilot signals associated with the generated plurality of constant envelope signals, respectively. The plurality of pilot signals h... | 03/23/2010 |
| 7684514 | Transmitter apparatus and wireless communication apparatus A transmitter providing a wide output control variable width with high efficiency is provided. Saturation mode operation is performed in the vicinity of the maximum transmission power and the input level of a large power amplifier is enlarged and fixed. When the lar... | 03/23/2010 |
| 7680210 | Method for generating I/Q signal in a TDMA transmitter and corresponding modulator The present invention relates to a digital I/Q modulator which efficiently supports multi-time-slot operation of wireless TDMA transmitters employing linear power amplifiers. According to the present invention, dips are introduced in the envelope of the I/Q signal i... | 03/16/2010 |
| 7672397 | Method for producing a transmission signal A method for producing a transmission signal, wherein an input signal (Vd(t)), which is to be amplified, is fed to a power amplifier (PA) which outputs the signal in an amplified form (va(t)). A reproduction thereof is made and allocates a specific pre-distortion in... | 03/02/2010 |
| 7664202 | Transmission device and wireless communication apparatus In a first mode in which the power level of a transmission output signal (S6) is to be high, an output from the multiplier (2) is input to an amplitude modulation signal amplifier (4), and a radio frequency power amplifier (5) performs am... | 02/16/2010 |
| 7664201 | Digital automatic gain control An automatic gain control system prevents input overload by precisely controlling the input level of a received, digitally modulated signal without variable gain amplification. Limiting amplification in conjunction with a logarithmic detection splits an input signal... | 02/16/2010 |
| 7656964 | Forward and reverse VSWR insensitive power detection using phase shifting and harmonic filtering A system for detecting both forward and reverse power of a power amplifier in the presence of harmonics created by the power amplifier is provided. A forward power detection system receives detection signals from an in-phase amplifier leg and a quadrature-phase ampl... | 02/02/2010 |
| 7653147 | Transmitter control An apparatus for transmitter control is disclosed. The apparatus includes an analog circuit designed to operate on at least a portion of a communications signal to be wirelessly transmitted, based at least in part on a control signal. The apparatus includes a lookup... | 01/26/2010 |
| 7643573 | Power management in a data acquisition system A data acquisition system includes a programmable gain amplifier, an analog-to-digital converter, a filter, and control circuitry. The programmable gain amplifier is operatively connected to receive an analog input signal on its input and generates an amplified sign... | 01/05/2010 |
| 7634024 | Adaptive peak windowing for crest factor reduction in a communication system transmitter In a communication system transmitter, a baseband processor is configured for coupling via an upconverter to an input of a power amplifier of the transmitter. The baseband processor comprises a crest factor reduction element implementing an adaptive peak windowing a... | 12/15/2009 |
| 7609781 | Wireless communication device with self calibration feature for controlling power output A wireless communication device is disclosed which employs a minimal number of power calibrations to set the output power of the device to a specified output power level. In one embodiment, the disclosed communication device includes a self calibrating feature that ... | 10/27/2009 |
