Multi-mode frequency compensation in mobile terminals
US10871575B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2018 |
| Grant date | Dec 22, 2020 |
| Priority date | — |
| Expiry date | Mar 28, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J2200/05
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods are described herein for multi-mode compensation of frequency errors within signals transmitted and received by a mobile terminal. The frequency error can be due to Doppler shift and oscillator error, which introduce opposite frequency shifts. In an acquisition mode, the mobile terminal initially compensates for the oscillator error while transmitting a signal to a communication system that contains the Doppler shift. Upon receiving a message from the communication system indicating the Doppler shift contained in the transmit signal, the mobile terminal can then switch to a tracking mode that can compensate for both Doppler shift and oscillator error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.