Qualcomm Incorporated

Qualcomm Technologies International, Ltd.

Oleg Popov

Andrew Gordon Summers

Philip Jones

Chi-Fung Kwok

William Daniel Connolley

Georgios Mylonas

Bahareh Siasi

An apparatus for wireless communication is disclosed that performs zero-crossing-avoidance encoding for quadrature amplitude modulation. In an example aspect, the apparatus includes a polar transceiver configured to be coupled to an antenna. The polar transceiver is configured to transmit, via the antenna, data including multiple symbols associated with quadrature amplitude modulation. The multiple symbols include multiple sets of two consecutive symbols. An absolute value of a phase difference between the two consecutive symbols within each set of the multiple sets is substantially different than 180 degrees.

Zero-crossing-avoidance encoding for quadrature amplitude modulation

An apparatus is disclosed that implements phase-locked loop (PLL) calibration. In an example aspect, the apparatus includes a PLL and a signal extraction path. The PLL includes an error determiner with an error output node and a loop filter with a filter input node and a filter output node. The filter input node is coupled to the error output node. The PLL also includes a voltage-controlled oscillator (VCO) with a VCO input node. The VCO input node is coupled to the filter output node. The PLL further includes a PLL tap node coupled between the filter output node and the VCO input node. The signal extraction path includes at least one switch, with the signal extraction path coupled to the PLL tap node.

Phase-locked loop (PLL) calibration

Certain aspects of the present disclosure generally relate to apparatus and techniques for wireless communication. One example apparatus generally includes an antenna terminal, an amplifier, a matching network coupled between the antenna terminal and an output of the amplifier, a first voltage envelope detector coupled to a node between the antenna and the matching network, and a current detection circuit coupled to the amplifier.

System for voltage standing wave ratio (VSWR) measurement

A power detector measures RF power delivered into a first load of uncertain impedance. A reference power meter measures power of a reference signal to a second load of known impedance. The reference power meter measures voltage across the second load; measures a current through the second load; and multiplies the measured voltage by the measured current to generate a reference power signal proportional to power delivered to the second load. A measurement power meter measures power of a signal to the first load. The measurement power meter measures voltage across the first load; measures current through the first load; and multiplies the measured voltage by the measured current to generate a measured power signal proportional to power delivered to the first load. The power detector includes a processor to calculate power delivered to the second load, and to generate a power delivered to the first load.

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Cambridge, United Kingdom

Oleg Popov