Methods and apparatus for use in obtaining frame synchronization in an OFDM communication system
US6807147B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2000 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2675
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An orthogonal frequency division multiplexing (OFDM) communication system includes base units which simultaneously transmit pilot tones in a predetermined pilot tone pattern during one or more time slots of a message slot. OFDM signals are received within a time slot; an OFDM signal level is determined at each frequency of a plurality of pilot tone frequencies; the signal levels and the predetermined pilot tone pattern are correlated; and a pattern detection value based on performing the correlation is generated and stored. This process is repeated for each time slot of a plurality of time slots. This process may be repeated for a plurality of message frame durations to produce a plurality of averaged pattern detection values, following which the plurality of averaged pattern detection values and a predetermined message frame pattern may be correlated. Then, a boundary of a message slot may be detected based on the correlation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.