Patent application number | Description | Published |
20120069871 | Temperature Compensation in a Telecommunications Device - A communications device, such as a GNSS receiver comprises an oscillator, having a temperature-dependent frequency characteristic, for generating signals at a nominal frequency; receiver circuitry, for receiving transmitted wireless signals using the signals generated by the oscillator; at least one temperature sensor, having a known positional relationship to the oscillator; an estimation device, for estimating a frequency of the signals generated by the oscillator, based on a measurement from the temperature sensor, and based on the temperature-dependent frequency characteristic of the oscillator; and at least one heat source. A change in the temperature of the oscillator is predicted, based on a state of the heat source, and further based on a model of the thermal properties of the communications device, and hence a change in the frequency of the signals generated by the oscillator is predicted, based on the temperature-dependent frequency characteristic of the oscillator. The receiver circuitry uses the estimated frequency of the signals generated by the oscillator, and the predicted change in the frequency of the signals generated by the oscillator, in receiving the transmitted wireless signals. | 03-22-2012 |
20130217398 | Transceiver Arrangement - An arrangement for a transmitter and/or receiver which is adapted to allow carrier aggregation in a wireless communication system, comprising a plurality of radio frequency (RF) blocks, each of which is inherently adapted to operate substantially across (in the region of) one of the particular groups of frequency ranges. The number of groups may be 5 or less. | 08-22-2013 |
20140018014 | Transceiver Device - A transceiver for RF signals uses receiving circuitry to derive control signals to reduce undesired signal frequencies in the output of the transmitting circuitry. | 01-16-2014 |
20140018133 | RF Communications - An envelope tracking amplifier for a transmitter has a voltage mapping linearly related to the square of the amplitude of the baseband signal. | 01-16-2014 |
20140176224 | Mixer Circuit - A switching circuit is linearized by using a capacitor to apply a drive voltage to an FET, wherein the drive voltage is independent of the signal switched by the switching circuit. | 06-26-2014 |
20150022271 | Dynamic Amplifier Supply - A method of providing a power supply of an amplifier of a wireless transmission system comprising, determining the power at an antenna when transmitting a signal to be transmitted by the amplifier, determining the modulation scheme for transmitting the signal, determining the frequency allocation of the signal to be transmitted, determining a transmit channel characteristic, and adjusting a parameter of the power supply of the amplifier based on the determining steps to maintain amplifier linearity. | 01-22-2015 |
20150146820 | Transmitter Linearization - An apparatus and method for reducing unwanted spectral emissions of a complex signal to be transmitted comprising calculating the nth power of the complex signal to be transmitted, calculating the complex conjugate of the nth power of the complex signal to be transmitted, applying a scaling factor to the complex conjugate to form a scaled correction signal, and adding the scaled correction signal to the signal to be transmitted. | 05-28-2015 |