Method of obtaining a phase difference signal
US4843616A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 1988 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Mar 8, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0067
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of obtaining a signal representing the phase difference between a local carrier signal and the carrier of an amplitude and/or phase shift keyed received signal wherein: the received signal is divided into two cartesian coordinate signal components which are a function of the phase difference and are in a quadrature relationship to one another; each pair of cartesian coordinate signal components, each representing one of a plurality of permitted signal states, is converted into two corresponding polar coordinate signal components, a decision is then made as to which is the permitted, unfalsified polar signal components which the polar signal components of the received signal most closely approach; and the phase difference is derived from a comparison between the decided-upon polar signal components and the received polar signal components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.