Filter for impulse response shortening with additional spectral constraints for multicarrier transmission
US9014250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2012 |
| Grant date | Apr 21, 2015 |
| Priority date | — |
| Expiry date | Apr 9, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03636
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A channel in a multiple carrier communication system is equalized by computing a desired spectral response, shortening the impulse response of the channel so that a significant part of an energy of the impulse response is confined to a region that is shorter than a target length and filtering the signal based on the desired spectral response. A multiple carrier communication system may include a primary impulse shortening filter that receives an output signal of an analog to digital converter and accepts coefficients. A secondary impulse shortening filter may receive the output signal of the analog to digital converter, output an output signal, and pass coefficients to the primary impulse shortening filter. A reference signal generator may output a reference signal. A comparator may compare the output signal and the reference signal and output a resulting error signal. An adaptive processor may compute coefficients for the secondary impulse shortening filter based on the error signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.