Hierarchical preamble constructions for OFDMA based on complementary sequences
US7483367B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2004 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | May 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/262
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of implementing OFDMA systems with enhanced preamble properties is presented. The transmit power is boosted during a preamble transmission, by utilizing preambles with a low Peak-to-Average Power Ratio (PAPR) property, as opposed to higher PAPR during the data portion of the transmission. Further, sets of preambles satisfying good PAPR properties in OFDMA systems are presented. The preambles satisfy a low Peak-to-Average Power Ratio (PAPR) property for numerous subsets of the usable subcarrier set. A method for generating a hierarchical set of preambles for OFDMA communication systems is described. The method hinges on the good PAPR properties of Golay's complementary sequences, and on hierarchical construction methods of larger complementary sequences out of smaller ones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.