Burst format and associated signal processing to improve frequency and timing estimation for random access channels
US6373858B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1998 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Jul 2, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2007/047
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A message format and associated method for estimating the frequency and timing offset of a reference burst of a random access channel in a time-division multiple access communications system. A signal structure in which the continuous wave segment is split into two parts separated by some portion of the content of the random access channel burst is used to provide more precise frequency estimation. Iteration of separate frequency and timing estimation procedures is used to refine both estimates, as the individual estimation processes are more accurate when there is less error in the other parameter. Multiple hypothesis testing is used, in which more than one initial frequency estimate is carried through the iteration process, with thresholding to identify the best frequency offset. Reliable rejection of false ambiguities is achieved because the degradation in timing estimation, due to large frequency offsets, can be detected with thresholding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.