OFDM signal transmission scheme, and OFDM signal transmitter/receiver
US7027464B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 28, 2000 |
| Grant date | Apr 11, 2006 |
| Priority date | — |
| Expiry date | Jan 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0232
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an OFDM transmission scheme, in order to compensate any frequency response variations time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector in a receiver receiving an OFDM signal detects a pilot symbol. A PS1 TPFR calculator calculates a frequency response of the transmission path for a first pilot symbol, while a PS2 TPFR calculators calculates a frequency response of the transmission path for a second pilot symbol for a second pilot symbol. Thereafter, a compensation vector calculator calculates compensation vectors from the frequency responses of the transmission path for both of the first and second pilot symbols by linear approximation. A frequency response compensatory compensates the frequency response variation of subcarriers in a data symbol based on the calculated compensation vectors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.