Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 8102941 | Peak suppression control apparatus A peak suppression threshold value control unit receives an input of quality requirement information, such as a modulation system and coding ratio, from a baseband signal generation unit, determines a threshold value of a peak suppression unit based on the quality r... | 01/24/2012 |
| 8098761 | 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... | 01/17/2012 |
| 8090051 | Combined feedback and feed-forward linearization of radio frequency (RF) power amplifiers A power amplifier module and corresponding system for linearizing the output from a power amplifier includes both a feedback system, containing a compensator and the power amplifier in a feedback loop, and a pre-distortion compensation system injecting pre-distortio... | 01/03/2012 |
| 8085869 | Configurable load impedance for power amplifier predistortion calibration An integrated circuit radio transceiver and method therefor includes an integrated circuit radio transceiver operable to provide specified gain levels and transmit path filter responses to correspond with a selected power spectral density mask. Changes in gain may b... | 12/27/2011 |
| 8085868 | Phase modulating and combining circuit A transmitter includes a modulating and combining circuit to which signals are supplied and modulated into in-phase and quadrature-phase signals. The in-phase and quadrature-phase signals are combined in a closed-loop voltage summing circuit. The voltage summing cir... | 12/27/2011 |
| 8085870 | Transmitter A transmitter suppresses peak power occurring in a transmission signal. The transmitter generates peak suppression signals for suppressing the peak power in the transmission signal respectively, synthesizes the peak suppression signals generated, and subtracts a sig... | 12/27/2011 |
| 8081712 | Method and apparatus for mapping of absolute power grant values in wireless communications A method and apparatus for adjusting power grants in wireless communications. Multiple power grant tables are stored and one or more tables are designated during communication. ... | 12/20/2011 |
| 8073074 | System and method for power control in a wireless transmitter A power control loop includes a feed forward unit 301 coupled to a data source, the feed forward unit 301 processes a signal for transmission, a feedback unit 302 coupled to the feed forward unit 301, the feedback unit 302 generate... | 12/06/2011 |
| 8073075 | Transmission apparatus and transmission power control method The transmission apparatus and transmission power controlling method are able to keep high speed feedback control and control transmission power accurately. Polar modulation transmitter (100) is provided with LPF (108) that performs waveform shaping of... | 12/06/2011 |
| 8064537 | Method and apparatus for dynamically adjusting a transmission power spectral density of pilot and data symbols A power spectral density of a pilot symbol and a data symbol is controlled for an uplink transmission by a mobile station in a wireless network by determining a power spectral density of at least one of the data symbol and the pilot symbol based on a peak-to-average... | 11/22/2011 |
| 8059749 | Systems and methods of RF power transmission, modulation, and amplification, including embodiments for compensating for waveform distortion Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one... | 11/15/2011 |
| 8054912 | Large-dynamic-range lookup table for a transmitter predistorter and system and method employing the same A predistorters for use with a nonlinear element and methods of predistorting for a nonlinear element for use in a 3G, e.g., WCDMA transmitter. In one embodiment, the predistorter includes: (1) a lookup table having non-uniformly spaced entries therein, (2) a compan... | 11/08/2011 |
| 8050353 | Systems and methods of RF power transmission, modulation, and amplification, including embodiments for compensating for waveform distortion Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one... | 11/01/2011 |
| 8050354 | Apparatus, and associated method, for communicating a data block in a multi carrier modulation communication scheme together with an identification sequence superimposed thereon Apparatus, and an associated method, for facilitating communication of a data block communicated in an OFDM-based, communication system. Side-information required to be transmitted by many PAPR reduction schemes in OFDM is carried and transmitted by sending orthogon... | 11/01/2011 |
| 8045643 | Forward and reverse VSWR insensitive power detection using quadrature downconversion A system and method for detecting both the forward and reverse power of a power amplifier are provided. The power amplifier is a quadrature power amplifier including an in-phase amplifier circuit and a quadrature-phase amplifier circuit. A radio frequency (RF) input... | 10/25/2011 |
| 8036306 | Systems and methods of RF power transmission, modulation and amplification, including embodiments for compensating for waveform distortion Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one... | 10/11/2011 |
| 8031804 | Systems and methods of RF tower transmission, modulation, and amplification, including embodiments for compensating for waveform distortion Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one... | 10/04/2011 |
| 8023588 | Adaptive predistortion of non-linear amplifiers with burst data Apparatus and methods control predistortion of an RF transmitter. A base station or a mobile station can utilize predistortion to improve linearity characteristics of the RF power amplifier. When used effectively, predistortion limits spectral growth such that the a... | 09/20/2011 |
| 8019015 | Linearization of RF power amplifiers using an adaptive subband predistorter Predistorting an input signal prior to amplification in an RF power amplifier (206) includes isolating a plurality sub-band signals, each representing a portion of the input signal s(t). The method includes independently modifying an amplitude and a phase of ... | 09/13/2011 |
| 8009765 | Digital polar transmitter A digital polar transmitter includes a baseband processor configured to receive an input signal and to convert the input signal into a baseband amplitude component and a baseband phase component. The transmitter also includes a phase modulator in communication with ... | 08/30/2011 |
| 8000409 | 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... | 08/16/2011 |
| 8000408 | Loop delay and gain control methods in closed-loop transmitters and wireless devices Embodiments include transmitters, wireless devices, and methods for performing loop delay and gain control. In a transmitter, a gain application element receives and combines digital input samples and a digital gain signal to generate gain-compensated digital sample... | 08/16/2011 |
| 7991074 | Processing transmission signals in radio transmitter A method, apparatus, and computer program is presented for use in a radio transmitter using a polar transmitter structure in which a transmission signal is separated into an amplitude component and a phase component. The transmission signal includes transmission sym... | 08/02/2011 |
| 7986749 | Method and apparatus for performing fast power control in a mobile communication system A method and apparatus for controlling transmission power in a mobile communication system is disclosed. The method disclosed provides for a closed-loop power control method for variable rate transmissions. The power of transmissions is varied in accordance with the... | 07/26/2011 |
| 7965789 | Reverse link power control for an OFDMA system Techniques for performing power control of multiple channels sent using multiple radio technologies are described. The transmit power of a reference channel, sent using a first radio technology (e.g., CDMA), is adjusted to achieve a target level of performance (e.g.... | 06/21/2011 |
| 7965790 | Log-antilog circuit and method for producing an up-converted and amplified transmission signal According to one exemplary embodiment, a method for producing an up-converted and amplified transmission signal comprises performing a logarithmic transformation of an input transmission signal to form a logarithmically transformed transmission signal, adding the lo... | 06/21/2011 |
| 7961812 | 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... | 06/14/2011 |
| 7953180 | Transmission power control method and transmission apparatus Even when there is limit placed upon transmission power control time, the transmission power control method enables accurate control transmission power. The transmission power control method includes: a first measuring step of measuring, in a symbol interval before ... | 05/31/2011 |
| 7936842 | Automatic bit rate control circuit A bit-rate automatic control circuit for feedback controlling the gain and bandwidth of a preamplifier in dependence on the bit-rate of a signal is disclosed. The circuit includes a bit-rate discrimination circuit configured to discriminate the bit rate of the signa... | 05/03/2011 |
| 7924942 | Power amplifier pre-distortion A power amplifier pre-distorter is formed by a FIR filter structure which includes an individual look-up table for each filter tap, where each look-up table represents a sampled polynomial in a variable representing signal amplitude, and means for selecting, from ea... | 04/12/2011 |
| 7907678 | Power series predistorter and control method thereof In a distortion generation path of a power series predistorter, a frequency characteristic compensator that adjusts the frequency characteristic of a distortion component is provided in series with an odd-order distortion generator. The output of a power amplifier i... | 03/15/2011 |
| 7894547 | 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 sum-difference stage, and a second amplitude correction stage. The first amp... | 02/22/2011 |
| 7889811 | Digital linear amplification with nonlinear components (LINC) transmitter Embodiments of the invention may provide for a digital LINC (linear amplification with nonlinear components) transmitter. The digital LINC transmitter may include a signal component separator, at least one digital delay modulator, a frequency synthesizer, at least o... | 02/15/2011 |
| 7873119 | Input drive control for switcher regulated power amplifier modules Various embodiments described herein relate to a power management block and an amplification block used in the transmitter of a communication subsystem. The power management block provides improved control for the gain control signal provided to a pre-amplifier and ... | 01/18/2011 |
| 7864882 | Method and apparatus for generating constant envelope modulation using a quadrature transmitter A multi-mode communication device (100) uses a quadrature transmitter (102) for transmitting both amplitude and constant envelope angle-modulated signals. For angle modulation, a separate feedback path is used from that used for amplitude modulated sig... | 01/04/2011 |
| 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 |
| 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 |
