Pseudo-random sequence padding in an OFDM modulation system
US7072289B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jun 1, 2001 |
| Grant date | Jul 4, 2006 |
| Priority date | — |
| Expiry date | Jan 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2671
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of estimating timing of at least one of the beginning and the end of a transmitted signal segment in the presence of time delay in a signal transmission channel. Each of a sequence of signal frames is provided with a pseudo-noise (PN) m-sequences, where the PN sequences satisfy selected orthogonality and closures relations. A convolution signal is formed between a received signal and the sequence of PN segments and is subtracted from the received signal to identify the beginning and/or end of a PN segment within the received signal. PN sequences are used for timing recovery, for carrier frequency recovery, for estimation of transmission channel characteristics, for synchronization of received signal frames, and as a replacement for guard intervals in an OFDM context.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.