Octagonal quadrature amplitude modulation
US8995573B1 · kind B1 · utility
2Cited by
11References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2012 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Jan 8, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3411
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Octagonal non-rectangular Quadrature Amplitude Modulation (QAM) is disclosed. Grid points from a uniform rectangular grid, which includes points that have equal horizontal and vertical spacing, are selected to form a non-rectangular octagonal grid that approximates an octagonal shape. QAM symbols are mapped to respective grid points in the non-rectangular octagonal grid to form a non-rectangular octagonal QAM constellation that also approximates the octagonal shape. Input signals can then be modulated using the non-rectangular octagonal QAM constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.