Method and apparatus for estimating frequency offset and timing offset of one or more mobile stations (MSs)
US7852909B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2007 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Aug 16, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/0007
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for estimating frequency offset and timing offset of a first Mobile Station (MS) in a communication system is provided. The method includes receiving a composite signal at a plurality of receiver antennas of a Base Transceiver Station (BTS). The composite signal includes a first signal transmitted from a first MS and a second signal transmitted from a second MS. The composite signal includes one or more tiles. Each tile includes a plurality of data sub-carriers, a plurality of first pilot sub-carriers, and a plurality of second pilot sub-carriers. A total phase offset of the first MS is estimated based on a complex conjugate product of pilot symbols of the plurality of first pilot sub-carriers. Thereafter, a first phase offset corresponding to the timing offset of the first MS is estimated based on a Power Delay Profile (PDP) of one or more first pilot sub-carriers. Finally, a second phase offset corresponding to the frequency offset of the first MS is determined based on the total phase offset and the first phase offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.