Correlated signal processor
US4567602A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1983 |
| Grant date | Jan 28, 1986 |
| Priority date | — |
| Expiry date | Jun 13, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2082
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A cross-correlated baseband signal processor for providing in-phase and quadrature phase shifted NRZ signals from an input signal, apparatus for cross-correlating the in-phase and quadrature shifted signals, and apparatus for generating in-phase and quadrature shifted intersymbol-interference and jitter free (IJF) modulated output signals having amplitudes such that the vector sum of the output signals is approximately the same at virtually all phase angles of each bit period. The resultant cross-correlated bandlimited PSK signal (XPSK) has an almost constant envelope and thus it can be passed through a saturated amplifier without AM/PM and AM/AM degradation and without the need for post-amplification filtering, as there is no spectral restoration (regrowth).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.