Carrier offset tracking for a receiver using channel impulse response
US5563888A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1993 |
| Grant date | Oct 8, 1996 |
| Priority date | — |
| Expiry date | Aug 13, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0065
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention provides for carrier offset tracking which is particularly well suited for use in a receiver for digital cellular mobile telephones. The tracking includes storing samples received in time slots, generating estimates of the transmission channel impulse response, recording two samples of each tap of each channel impulse response estimate, generating frequency offset estimates from the phase difference in each time slot between the samples, combining this plurality of frequency offset estimates to generate a precise frequency offset estimate, and adjusting a controllable frequency source to compensate for the precise frequency offset estimate. Time-reversed operation further enhances performance and permits implementation with reasonable complexity for a standards compliant mobile receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.