Orthogonal frequency division multiplexing with PN-sequence
US7715484B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2005 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Mar 20, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2678
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The invention relates to an orthogonal frequency division multiplexing system with PN-sequence. In the synchronization of the invention, both timing offset and frequency offset are estimated and compensated by utilizing a time and frequency synchronization device. In addition, the PN-sequence with the cyclic prefix is added to the OFDM symbol before transmitting. The time and frequency synchronization device of the invention comprises two synchronization circuits from the cyclic prefix and PN-sequence when calculating the timing offset and frequency offset of receiving signal. As a result, the OFDM system of the invention not only has better performance in fading channel, but also has the better bandwidth utilization without extra bandwidth for transmitting the PN-sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.