Method and apparatus for estimating Doppler spread
US6922452B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2001 |
| Grant date | Jul 26, 2005 |
| Priority date | — |
| Expiry date | Jun 21, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/01
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Doppler spread associated with a Rayleigh or fast fading channel established between a radio base station and a mobile radio station is estimated. In particular, the Doppler spread is estimated through calculation of the autocorrelation function of a sequence of complex channel estimates determined from a known sequence in the received signal. More specifically, a sequence of complex channel estimates obtained from the known sequence in a first sampling interval is complex conjugated and then correlated with a sequence of complex channel estimates obtained from the known reference in a second sampling interval which have been not been complex conjugated. A zero crossing of the complex autocorrelation function is detected, and the estimated Doppler spread is calculated using this zero crossing and a Bessel function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.