Patent application number | Description | Published |
20100052968 | INTERFERENCE DETECTION APPARATUS AND METHOD - Techniques for detecting jammers in a received signal are described. A jammer detector includes a jammer filter for attenuating transmit signals leaked into the receive path, a pulse generator for converting the interference signals into discrete-level pulses, and a pulse processor for determining the presence of jammers in the discrete-level pulses. In an exemplary embodiment, the pulse processor is configured to further discriminate among close-in jammers that are close to the desired receive frequency, far-away jammers, and jammers arising from the transmit signals leaked into the receive path. In another exemplary embodiment, hysteresis is provided in the pulse generator to enable the generation of reliable pulses. Further aspects include configuring the jammer detector for operation in a plurality of frequency bands and/or according to a plurality of communications standards. | 03-04-2010 |
20100260233 | PHASE TRACKING IN FREQUENCY DOMAIN IN A WIRELESS COMMUNICATION SYSTEM - Techniques for correcting sampling frequency offset (SFO) and carrier frequency offset (CFO) in a wireless communication system are disclosed. An apparatus for correcting SFO and CFO may include a pilot tone extractor for extracting a plurality of pilot tones from one or more first symbols, a demodulator, an error signal generator, a loop filter, an angle generator, and a device for applying a correction phase to one or more symbols subsequent to the one or more first symbols. The demodulator is configured to demodulate the pilot tones. The error signal generator is configured to generate an error signal by summing and calculating the arctangent of the plurality of demodulated pilot tones. The loop filter is configured to generate an estimated phase rotation due to a residual CFO and the angle generator is configured to generate a correction phase for the plurality of tones. | 10-14-2010 |
20130094550 | SHARED FEEDBACK FOR ADAPTIVE TRANSMITTER PRE-DISTORTION - A modem is described. The modem includes a transmitter. The transmitter includes a digital pre-distortion module and a power amplifier. The modem also includes one or more selected shared receivers. The one or more selected shared receivers generate a feedback signal for the digital pre-distortion module. The modem further includes a feedback switch. The feedback switch selectively couples the one or more selected shared receivers to an output of the transmitter. | 04-18-2013 |
20130208826 | REDUCTION OF SMALL SPURS IN TRANSMITTERS - An apparatus for reducing spurs is described. The apparatus includes a coarse digital to analog converter (DAC). The apparatus also includes a correction term generator. The correction term generator generates a correction term. The correction term has an amplitude within a dynamic range of the coarse digital to analog converter (DAC). The apparatus also includes a baseband filter. The correction term is selected such that the baseband filter reduces the correction term to an amplitude approximating that of a spur in a transmit signal. The correction term is used to reduce a spur. | 08-15-2013 |
20130229954 | FREQUENCY SYNTHESIZER ARCHITECTURE IN A TIME-DIVISION DUPLEX MODE FOR A WIRELESS DEVICE - A dual frequency synthesizer architecture for a wireless device operating in a time division duplex (TDD) mode is disclosed. In an exemplary design, the wireless device includes first and second frequency synthesizers. The first frequency synthesizer generates a first oscillator signal used to generate a first/receive local oscillator (LO) signal at an LO frequency for the receiver. The second frequency synthesizer generates a second oscillator signal used to generate a second/transmit LO signal at the same LO frequency for the transmitter. The two frequency synthesizers generate their oscillator signals to obtain receive and transmit LO signals at the same LO frequency when the wireless device operates in the TDD mode. | 09-05-2013 |
20140119216 | TWO-DIMENSIONAL TRANSMIT POWER COMPENSATION - Exemplary embodiments are related to two-dimensional maximum power compensation. A method may include calibrating an output power level of a transmitter across a range of frequencies at a constant temperature. The method may further include characterizing the output power level of the transmitter for each temperature of a plurality of temperatures for each frequency of the range of frequencies. | 05-01-2014 |
20140273901 | REDUCING POWER CONSUMPTION ON A RECEIVER - A method for reducing power consumption on a wireless communication device is described. The wireless communication device includes a first stage active filter and a second stage active filter. A condition measurement is obtained that includes a signal measurement condition. If it is determined that the condition measurement is above a threshold, the second stage active filter is bypassed. | 09-18-2014 |
20150280673 | SPECTRUM SENSING RADIO RECEIVER - A device includes a reconfigurable receiver front end having variable gain and variable bandwidth configured to tune to a plurality of communication channels in a communication band, the reconfigurable receiver front end responsive to a signal power level. | 10-01-2015 |