Clock calibration using sine waves
AssigneeQUALCOMM Incorporated
InventorsYiwu Tang, Zhifei Fan, Chengjin Zhang, Yue Chao
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Abstract
Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically relate to using one or more clock synchronization signals comprising sine waves to calibrate a local clock at an ambient internet of things (IoT) device. In some aspects, the ambient IoT device may receive a mixed signal comprising a pair of dual-tone sine waves and calibrate the local clock using a difference in frequencies of the pair of dual-tone sine waves.
Claims20
An ambient internet of things (IoT) device, comprising:
- one or more antennas;
- and
- a processing system that includes one or more processors and one or more memories that store code for the one or more processors, the processing system configured to cause the ambient IoT device to:
- receive a mixed signal comprising multiple sine waves including a first sine wave having a first frequency and a second sine wave having a second frequency, the mixed signal comprising a reader-to-tag clock synchronization signal, and the first sine wave and the second sine wave being a first pair of dual-tone sine waves;
- and
- calibrate a clock that comprises a local oscillator of the ambient IoT device using:
- a difference between the first frequency of the first sine wave, included in the mixed signal, and the second frequency of the second sine wave, included in the mixed signal, and
- a second pair of dual-tone sine waves including a third sine wave having a third frequency and a fourth sine wave having a fourth frequency.
A method of wireless communication performed at an ambient internet of things (IoT) device, comprising:
- receiving a mixed signal comprising multiple sine waves including a first sine wave having a first frequency and a second sine wave having a second frequency, the mixed signal comprising a reader-to-tag clock synchronization signal, and the first sine wave and the second sine wave being a first pair of dual-tone sine waves;
- and
- calibrating a clock that comprises a local oscillator of the ambient IoT device using:
- a difference between the first frequency of the first sine wave, included in the mixed signal, and the second frequency of the second sine wave, included in the mixed signal, and
- a second pair of dual-tone sine waves including a third sine wave having a third frequency and a fourth sine wave having a fourth frequency.
An apparatus for wireless communication, comprising:
- means for receiving a mixed signal comprising multiple sine waves including a first sine wave having a first frequency and a second sine wave having a second frequency, the mixed signal comprising a reader-to-tag clock synchronization signal, and the first sine wave and the second sine wave being a first pair of dual-tone sine waves;
- and
- means for calibrating a clock that comprises a local oscillator of the apparatus using;
- a difference between the first frequency of the first sine wave, included in the mixed signal, and the second frequency of the second sine wave, included in the mixed signal, and
- a second pair of dual-tone sine waves including a third sine wave having a third frequency and a fourth sine wave having a fourth frequency.
Dependencies are inferred from the claim text.