Timing synchronization in pulse position modulation (PPM) modems
US12107709B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 2022 |
| Grant date | Oct 1, 2024 |
| Priority date | — |
| Expiry date | Aug 26, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/11
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A PPM-modulated signal is based on a format comprising (i) N data slots per symbol period, (ii) guard slots separating the data slots, and (iii) the symbols are encoded by the position of pulses within the data slots. Timing synchronization of the receiver to an incoming PPM-modulated signal is achieved as follows. The incoming PPM-modulated signal is processed to generate slot detection signals, which are indicative of a presence of a pulse in a corresponding one of the N data slots. A timing correction signal is generated based on a difference between (a) accumulated slot detection signals for receiver data slot 1, and (b) accumulated slot detection signals for receiver data slot N. Timing of the receiver is adjusted based on the timing correction signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.