Acquisition and adjustment of gain, receiver clock frequency, and symbol timing in an OFDM radio receiver
US7349462B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2003 |
| Grant date | Mar 25, 2008 |
| Priority date | — |
| Expiry date | Mar 11, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03522
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a method and apparatus for adjusting gain setting, receiver clock frequency, and symbol timing in an OFDM radio receiver. The method is based on the reception of a preamble with known periodic training sequences transmitted prior to user data over the radio channel. By computing a periodicity metric, an inner receiver detects the presence of periodic signals in the received data sequence, provides means to set the Variable Gain Amplifier VGA gain in the radio frontend, and estimates frequency offsets between the transmit and receive clock. Matched filters are used to determine the symbol timing. A finite-state-machine schedules various tasks during the receiver startup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.