High speed digital communication receiver
US4281411A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1979 |
| Grant date | Jul 28, 1981 |
| Priority date | — |
| Expiry date | Jun 25, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An improved high speed digital communications diversity receiver using a forward adaptive transversal filter equalizer, having a plurality of weighting sections in each diversity channel to provide a combined weighting signal, wherein the required complex multiplications and correlations needed for weighting purposes are performed at IF frequencies, while the time-delayed combining operations for providing the desired combined weighted output signal are performed at baseband frequencies. Such an arrangement reduces the number of tapped delay lines normally needed for such transversal filter equalizer operation and further reduces the signal losses incurred in operating delay line devices at intermediate frequencies so that fewer large gain-bandwidth product amplifiers are required in the system than the number required in previously available systems using such forward transversal filter equalizers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.