Quotables
"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 8190106 | Base station control apparatus and base station control method There is provided a base station control apparatus and a base station control method in which a frame is segmented in a situation in which interference may occur. A BS controller divides and controls a base station into three sectors and controls communications with... | 05/29/2012 |
| 8185065 | Transmitting unit that reduces PAPR using out-of-band distortion and method therefor A transmitting unit (12) clips a communication signal (14) to form a threshold-responsive signal (36, 36′) which includes in-band distortion (40) and out-of-band distortion (38). A portion of the out-of-band distortion (38... | 05/22/2012 |
| 8175550 | Method and apparatus for interference mitigation by removing a portion of the transmit signal Elimination of intermodulation interference in a wireless communication system by removing a portion of the spectrum of transmitted signals. According to a received indication of an occurrence of intermodulation interference experienced by a narrowband receiver, map... | 05/08/2012 |
| 8170506 | Direct current (DC) offset correction using analog-to-digital conversion Techniques for reducing or eliminating DC (direct current) offset in transmitters are disclosed. An apparatus for DC offset reduction may include a converter, a digital engine, and a plurality of programmable current supplies. The converter is configured to provide ... | 05/01/2012 |
| 8160514 | Transmission noise cancellation Exemplary embodiments of the disclosure are directed to down-converting an RF signal of a transmitter to baseband, filtering the down-converted signal, and generating a composite signal based on the filtered down-converted signal and a transmission based-band signal... | 04/17/2012 |
| 8135360 | RFID-tag communication device An RFID-tag communication device including (a) an antenna from which a transmission signal is transmitted toward an RFID tag and through which a reply signal transmitted from the RFID tag in response to the transmission signal is received, for radio communication wi... | 03/13/2012 |
| 8131231 | Method and apparatus for canceling interference in a hybrid terminal supporting both broadcast service and mobile communication service, and a hybrid terminal thereof A method and apparatus for canceling interference during reception of a broadcast signal in a hybrid terminal including a broadcast receiver and a mobile communication terminal. In the interference cancellation apparatus, a gain controller adjusts transmission power... | 03/06/2012 |
| 8131232 | Method and apparatus for antenna tuning A method for tuning a transmitter in order to improve impedance matching to an antenna or to intermediate radio frequency stages uses an error detector that senses a deviation of the amplitude or phase angle of a load current of a power amplifier driver or of a powe... | 03/06/2012 |
| 8107900 | Multi-carrier transmission device A multi-carrier transmission device improves peak suppression efficiency in a multi-carrier signal. The multi-carrier transmission device (100) has a peak suppression unit (140) for dividing a multi-carrier signal into two parts: a first multi-carrier ... | 01/31/2012 |
| 8099064 | Mobile wireless communications device with reduced harmonics resulting from metal shield coupling A mobile wireless communications device includes a housing and antenna supported by the housing. At least one circuit board is carried by the housing and has radio frequency (RF) circuitry operative with the antenna for receiving and transmitting RF signals through ... | 01/17/2012 |
| 8090330 | System having a filter A system having a filter is disclosed. One embodiment includes at least two polyphase filter branches, each of the polyphase filter branches including a respective recursive allpass filter, wherein the filter approximates a linear filter. ... | 01/03/2012 |
| 8086191 | Leakage power reduction apparatus A circulator extracts a transmission signal sent from a transmitter to antenna via the circulator and a duplexer, reflected by an antenna, and returned via the duplexer to the transmitter side. The amplitude and phase of the extracted signal are adjusted by an ampli... | 12/27/2011 |
| 8078124 | Enhancing antenna performance in RF devices Method and apparatus for improving RF signal performance of a battery-operated handheld device includes RF isolating the battery from DC-powered circuitry and actively incorporating the battery in RF signal transfers with respect to an RF antenna. ... | 12/13/2011 |
| 8078123 | RF transmission error detection and correction module A radio frequency (RF) transmission correction module includes an RF transmission error detection module and a correction module. The error detection module includes an RF envelope detector, a signal conversion module, and an error detection module. The RF envelope ... | 12/13/2011 |
| 8055215 | Transmission circuit and communication device Provided is a transmission circuit capable of operating with high linearity and with low noise. An AM variable fc filter uses an AM cutoff frequency to remove a high frequency component from an amplitude signal. An amplifier supplies a power amplifier with a voltage... | 11/08/2011 |
| 8055216 | Antenna matching for MIMO transceivers A multiple antenna system is described herein that mitigates the negative effects of mutually coupled antennas on the connected transmitters and/or receivers. The antenna system comprises a directional coupler and two or more antennas. The directional coupler compri... | 11/08/2011 |
| 8050636 | Apparatus and method for generating RF without harmonic interference A transmitter capable of operating according to a first standard that does not interfere with a nearby frequency generator operating according to a second standard. The transmitter comprises an oscillator, a frequency divider, a mixer, and a filter. The oscillator i... | 11/01/2011 |
| 8000660 | Method and apparatus for interference mitigation by removing a portion of the transmit signal Elimination of intermodulation interference in a wireless communication system by removing a portion of the spectrum of transmitted signals. According to a received indication of an occurrence of intermodulation interference experienced by a narrowband receiver, map... | 08/16/2011 |
| 7983635 | System and method for controlling intermodulation interference In one embodiment, a method of controlling intermodulation (IM) interference is provided. The method comprises determining if an IM product spectrum overlaps the spectrum of an assigned receive frequency and determining when transmissions from at least two transmitt... | 07/19/2011 |
| 7957707 | Systems, apparatus and method for performing digital pre-distortion based on lookup table gain values A system (100, FIG. 1) performs digital pre-distortion using gain values stored in a lookup table (150). A method for performing digital pre-distortion includes identifying (310, FIG. 3) a lookup table entry, based on input data, a... | 06/07/2011 |
| 7941105 | Reflection cancellation circuit for a radio frequency power amplifier The present invention is an RF cancellation circuit located between the output of a power amplifier and downstream circuitry, such as a transmitting antenna. The RF cancellation circuit cancels reflections resulting from antenna impedance mismatches, thereby present... | 05/10/2011 |
| 7904034 | Method and system for providing an interference cancellation in a wireless communication system A system, a receiver apparatus, a transmitter apparatus and a method for inter-user interference cancellation when simultaneous transmissions from two wireless users to the same base station are repeated using the same time-frequency resource. The percentage of inte... | 03/08/2011 |
| 7904033 | 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 ... | 03/08/2011 |
| 7899415 | Low-frequency power line emissions reduction system and method A radio system comprises a power source and a power amplifier circuit coupled to the power source on a power line. The radio system also comprises an active cancellation circuit. The active cancellation circuit comprises a bi-directional DC-DC converter. The active ... | 03/01/2011 |
| 7881679 | Method and apparatus for integrating power amplifiers with phase locked loop in a single chip transceiver A phase locked loop and power amplifier are integrated on single chip. To eliminate cross-talk between the components, a frequency translation block is introduced to change the output frequency of the PLL. To isolate the components from unwanted feedback, a high iso... | 02/01/2011 |
| 7848716 | Semiconductor integrated circuit for communication The present invention provides a semiconductor integrated circuit for communication (RF IC) realizing high yield without deteriorating a carrier leak characteristic even when a modulation circuit is formed by using cheep parts with large variations. In a semiconduct... | 12/07/2010 |
| 7826808 | Method, apparatus and system for an omni digital package for reducing interference A system for an omni digital package for reducing interference may include a passive combiner and a transmit signal canceller. The passive combiner may be configured to combine at least two input frequencies to produce a combined signal. The transmit signal cancelle... | 11/02/2010 |
| 7817969 | Limiting audible noise introduction through FM antenna tuning An FM receiver including an FM antenna that receives continuous wavelength signals, where the FM receiver is coupled to the FM antenna and operable to alter a center frequency of a gain profile of the FM antenna. The FM receiver includes a low noise amplifier module... | 10/19/2010 |
| 7796959 | Data processing method, transmitter, device, network element and base station The invention is related to a device comprising: generating unit configured to generate a feedback signal; setting unit configured to set a predetermined frequency shift to the feedback signal; evaluating unit configured to evaluate distortion caused in a transmissi... | 09/14/2010 |
| 7787837 | Systems and methods for an RF nulling scheme in RFID Systems and methods for an RF nulling scheme are provided. An RF nulling scheme can minimize the level of unwanted RF signal reflections entering the receiver without attenuating the desired signal response from an RFID tag. In one aspect of the RF nulling scheme a ... | 08/31/2010 |
| 7734259 | Method and system for a transmitter loft cancellation scheme that maintains IQ balance Methods and systems for a transmitter LOFT cancellation scheme that maintains IQ balance are disclosed. Aspects of one method may include providing current compensation to both differential inputs of a mixer for each of I and Q channels. An initial current compensat... | 06/08/2010 |
| 7734260 | Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to... | 06/08/2010 |
| 7729667 | System and method for intermodulation distortion cancellation A linearizer for reducing intermodulation distortion in a non-linear device. The novel linearizer includes an input port for receiving a signal from the device and a circuit for effecting gain expansion on the signal that counteracts a gain compression of the device... | 06/01/2010 |
| 7715810 | System and method for combining stepped drain bias control with digital predistortion for a power amplifier The present disclosure relates generally to systems and methods for combining stepped drain bias control with digital predistortion for a power amplifier. In one example, the method includes receiving an input associated with a transmit power level of a transmitter ... | 05/11/2010 |
| 7697905 | Local oscillator feedthrough cancellation scheme to remove RF and baseband offsets An scheme to provide local oscillator feedthrough offset cancellation to remove baseband and radio frequency coupled offsets. Two separate offset cancellation currents are injected at a driver which drives a baseband signal into a mixer to mix with a local oscillato... | 04/13/2010 |
| 7689178 | Method and apparatus for spreading sequence hopping in code-multiplexed control channels A method and apparatus for code multiplexing one or more control signals onto a shared control channel. According to the present invention, a control signal for transmission from a base station to a mobile station terminal is repeated in each slot of a predetermined... | 03/30/2010 |
| 7680467 | Distortion compensating amplifier In a distortion compensating amplifier that compensates for distortion occurring in main amplifiers, a first amplifying unit amplifies, with a first main amplifier, a first signal consisting of a main signal to be amplified and detects distortion occurring in the fi... | 03/16/2010 |
| 7676201 | Selectable sideband transmission The sideband used by a low-intermediate-frequency transmitter for transmitting signals on a channel is selectable. In some embodiments of the invention, the sideband used for transmitting signals is selected based on the location of the channel within a band of chan... | 03/09/2010 |
| 7657236 | Transmitter having reduced local oscillator (LO) leakage by determining direct LO coupling and baseband DC offset A transmitter generates a transmitter output signal from first and second baseband signals. The transmitter includes a detector to detect a local oscillator (LO) leakage signal in the transmitter output signal. A controller coupled to the detector determines a direc... | 02/02/2010 |
| 7643802 | Mixer circuit and method for reducing an up-conversion mixer leakage A mixer circuit includes a first oscillator, a second oscillator, an up-conversion mixer, a down-conversion mixer, and a detect and control unit. The up-conversion mixer has a first input terminal coupled to the first oscillator and an output terminal. The down-conv... | 01/05/2010 |
