Demodulated radio signals
US5754595A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1996 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Apr 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/066
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A received and demodulated multi-level signal (32) is corrected for D.C. offset by a feedback loop (34) which applies a correction signal (38) to the multi-level signal (32). Initial coarse correction is provided by feeding the corrected signal (42) into the feedback loop where a low pass filter (36) averages the corrected signal over time and detects departure from zero of this time-averaged signal. After initial coarse correction, finer correction of D.C. offset is provided in a data-aided mode in which detected data values (46) are fed into the feedback loop (34). The method achieves D.C. offset correction without the need to know anything about the data pattern of the received signal (32).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.