Modified OFDM subcarrier profile
US7272109B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 2004 |
| Grant date | Sep 18, 2007 |
| Priority date | — |
| Expiry date | Mar 17, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2602
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A 10 MHz channelized orthogonal frequency division multiplexing (OFDM) transmitter is provided that communicates using a modified OFDM packet structure with a half-rate oscillator having standard accuracy. The transmitter has an inverse fast fourier transform (IFFT) data processor that appends an outer pair of data subcarriers on either end of an OFDM subcarrier profile. An IFFT long sync processor appends an outer pair of binary phase shift key (BPSK) subcarriers on either end of an OFDM long sync subcarrier profile. By copying or appending the information of the data subcarriers closest to zero Hz. to more robust locations, 10 MHz channelized OFDM can be achieved with half-rate clocks and 20 PPM oscillators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.