Methods and apparatus for OFDM symbol synchronization for in-door digital TV reception
US8483330B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2009 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | Apr 14, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2607
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A received signal comprises a continuous sequence of symbols φ1, φ2, . . . φn, each represented by a sequence of samples X0, X2, . . . Xn−1, and wherein the symbols have a guard period GP of duration Tgp at the beginning thereof. Each guard period contains a cyclic prefix with the same subsequence of samples as a tail end portion of the associated symbol. The symbols are identified by delaying the received signal by a fixed number of samples, computing the correlation of the received signal with the delayed signal, computing the summation of said correlation over a window of duration Ti, wherein Ti>Tgp, and sliding the window over the correlation to find a characteristic point or region. The start of each symbol for further processing is selected from the characteristic point or region. By increasing the duration of the window, more robust performance can be achieved, especially in multipath conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.