Method and apparatus for channel impulse response estimation in GSM systems
US7428276B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2005 |
| Grant date | Sep 23, 2008 |
| Priority date | — |
| Expiry date | Oct 26, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0228
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for estimating channel impulse response (CIR) in a communication system includes converting RF analog signals to obtain baseband digitized signals, sampling the baseband digitized signals according to the symbol period or bit period, cross-correlating at least part of the samples and a predetermined set of training sequence symbols, and calculating the ratio of the maximum square of the modulus (power) value and the second largest value among the outputs of the cross-correlations. If the ratio is larger than a first predetermined value, the method outputs the cross-correlation values as the CIR according to the time step index of the maximum power value, and if the ratio is not larger than the first predetermined value, the method calculates the energy of a predetermined window and outputs the cross-correlation values as the CIR according to the time step index of the maximum energy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.