Symbol generator for phase modulated system
US4745628A · kind A · utility
147Cited by
7References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Apr 15, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2014
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A symbol generator is provided for generating a filtered analog waveform for use in phase modulating a carrier. A memory (30) is provided for storing predetermined waveform segments. The waveform segments are correlated with an input data stream. The data stream is converted to an address for the memory (30) to output a digital value to a D/A converter (122). The output of the D/A converter (122) is comprised of in-phase and quadrature-phase components which are input to a sample and hold circuit for generating the analog signals. The waveform segments are then sequentially assembled and input to a vector modulator (168).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.