Pragmatic trellis-coded modulation system and method therefor
US6097764A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1998 |
| Grant date | Aug 1, 2000 |
| Priority date | — |
| Expiry date | Mar 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0055
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital communication system (20) communicates using a polar amplitude phase shift keyed (P-APSK) phase point constellation (70, 70', 70"). Pragmatic encoding is accommodated using the constellation (70, 70', 70") to simultaneously communicate both encoded and uncoded information bits (69, 51). The constellation (70, 70', 70") has an even number of phase point rings (74) and equal numbers of phase points (72) in ring pairs (75, 76, 77). Encoded information bits (69) specify secondary modulation and uncoded information bits (51) specify primary modulation. The constellation (70, 70', 70") is configured so secondary sub-constellations (78) include four phase points (72) arranged so that two of the four phase points (72) exhibit two phase angles at one magnitude and the other two of the four phase points (72) exhibit phase angles that are at another magnitude. The difference between the phase angles at different magnitudes within a secondary sub-constellation (78) is constant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.