Automatic frequency offset compensation in a TDD wireless OFDM communication system
US7782985B2 · kind B2 · utility
23Cited by
49References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 9, 2007 |
| Grant date | Aug 24, 2010 |
| Priority date | — |
| Expiry date | Jan 3, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2613
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Offsets in the transmit clock in a wireless communication system are corrected by using data distributed over many frequencies. In the time domain the system uses separate copies of the same signal transmitted with a known spacing in terms of transmit clock signals. The variation of timing between the received signals yields an initial estimate that then is used in a closed loop tracking arrangement to yield and compensate for unpredictable rate changes caused by, for example, jitter, Doppler or thermal drift. The frequency offset for one channel can then be used to calculate the offset for other channels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.