Digital radio receiver
US5703910A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Sep 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/233
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present receiver includes a radiofrequency part (RF) coupled to a limiting amplifier (SL) which is in turn coupled to a demodulation means (DM) which recovers a digital signal from a received signal obtained by modulating a carrier signal with this digital signal. The limiting amplifier (SL) has an input-output characteristic which is substantially linear for smaller input signals and which strives with a decreasing gain towards a limit value for larger input signals. Due to this input-output characteristic smaller received signals are treated linearly up to the demodulation means (DM). The latter can therefore for these signals compensate for a specific spectrum shaping of the digital signal performed before the actual modulation. In this way the receiver will perform in a nearly optimal way resulting in low bit error rates. For larger received signals the limiting amplifier (SL) is non-linear and such compensation is consequently without effect resulting for these signals in a performance degradation. The Latter however is acceptable because these signals are naturally demodulated with less errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.