Digital modulating/demodulating apparatus and a digital demodulating apparatus
US5535244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Jun 2, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3836
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital modulating/demodulating apparatus includes a demodulator for demodulating a modulated signal into a demodulated positional signal in response to a receipt of the modulated signal, a decoder for decoding the demodulated positional signal into a digital signal of N bits. A previous signal point on the constellation plane is defined by a previous demodulated positional signal and a current signal point on the constellation plane is defined by a current demodulated positional signal. The decoder outputs a digital signal of N bits, based on en amplitude and a phase of the previous signal point and the amplitude and the phase of the current signal point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.