Channel tracking using step size based on norm-1 based errors across multiple OFDM symbols
US7362812B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2004 |
| Grant date | Apr 22, 2008 |
| Priority date | — |
| Expiry date | May 7, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03687
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A channel tracking module, configured for generating updated equalization coefficients for a frequency equalizer, is configured for determining a digital-based error value between equalized signals output by the frequency equalizer relative to predicted signals, for each subcarrier frequency of an OFDM symbol. The channel tracking module determines an accumulated error based on accumulating the digital-based error values for all the subcarrier frequencies of the OFDM symbol, for a prescribed successive number of OFDM symbols. The channel tracking module also determines a step size based on the accumulated error and relative to a prescribed step function configured for optimizing equalizer adjustments within stability limits. The channel tracking updates the equalization coefficients for each subscarrier frequency based on the accumulated error and the step size. Hence, the channel tracking module can be implemented in an economical manner while ensuring optimum equalizer adjustments within stability limits that ensure convergence of the equalization coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.