High density FM subcarrier modulation with standardized network layer
US6307890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Dec 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention provides a system for multiplexing DARC encoded source channels using an FM subcarrier, wherein the system includes a plurality of channels. Each channel within the plurality of channels is coupled to its own DARC encoded source channel. Within each channel of the system, the DARC encoded source channel is block encoded to produce parity and data bytes. The parity bytes and data bytes are separately trellis code modulated to form a first and second set of complex signals, respectively. A first digital modulator modulates a first set of orthogonal signals using the first set of complex signals. A second digital modulates a second set of orthogonal signals using the second set of complex signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.