Constellation design and optimization in non-linear satellite channels
US9031168B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 2014 |
| Grant date | May 12, 2015 |
| Priority date | — |
| Expiry date | Apr 21, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/3405
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for optimizing a constellation for M-ary amplitude phase shift keying (M-APSK) that provides signal modulation for transmitting a series of digital bits in an analog signal by a transmitter to be received by a receiver over a communications channel. The method includes identifying symbol-wise mutual information of a transmitted constellation, where the symbol-wise mutual information includes a conditional probability density function. The method identifies an unconstrained capacity that defines an ultimate performance limit of the constellation, and minimizes a difference between a rate of the symbol-wise mutual information and a rate of the unconstrained capacity to determine the number of rings, the number of symbols in each ring and the ring ratio in the constellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.