Phase and frequency drift compensation in Orthogonal Frequency Division Multiplexing systems
US7333548B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 2003 |
| Grant date | Feb 19, 2008 |
| Priority date | — |
| Expiry date | Jan 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2695
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A phase drift compensation scheme for multi-carrier systems. According to the invention, a timing offset compensator is provided to compensate for a timing offset in a current symbol after taking an N-point FFT. Then a phase estimator computes a phase estimate for the current symbol based on a function of a channel response of each pilot subcarrier, transmitted data on each pilot subcarrier, and a timing compensated version of the current symbol on the pilot subcarrier locations. From the phase estimate, a tracking unit can generate a phase tracking value for the current symbol. Thereafter, a phase compensator uses the phase tracking value to compensate the timing compensated version of the current symbol for the effect of phase drift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.