Methods and apparatuses for signaling with geometric constellations in a Raleigh fading channel
US10524139B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2017 |
| Grant date | Dec 31, 2019 |
| Priority date | — |
| Expiry date | Aug 21, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/0473
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Communication systems are described that use signal constellations which have unequally spaced (i.e. “geometrically spaced,” or “non-uniform”) points. In many embodiments, the transmitters and receivers use specific non-uniform quadrature amplitude modulation (NU-QAM) constellations. In a variety of embodiments, NU-QAM constellations are capacity optimized using a bit-interleaved coded modulation (BICM, also referred to as “parallel decode”) capacity measure. In a number of embodiments, the transmitters and receivers are described that use specific NU-QAM constellations that provide gains in BICM capacity relative to constellations that maximize the minimum distance between constellation points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.