Method of channel order selection and channel estimation in a wireless communication system
US6907092B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2000 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Apr 27, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0216
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A novel and useful apparatus for and method of determining the channel order and channel estimate in a communications system such as a wireless communication system including cellular and cordless. Such channels are typically characterized by rapidly changing impulse response and their taps can be modeled as zero-mean, complex, Gaussian random processes. A sufficiently long, initial channel estimate of length is performed so as to ensure that the actual channel taps will be contained in the estimated taps thus making certain that the equalizer will effectively eliminate intersymbol interference. Channel estimation is performed during each burst using the training sequence transmitted in the middle of the burst. The tap energies are averaged so as to track slow variations in the pattern of resultant channel taps. A noise floor is calculated using the lowest averaged taps and a threshold is computed based thereon and applied to the average taps. The channel order and the tap positions are then selected in accordance those average taps that are above the threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.