Planar approximating method for computing the log-likelihood ratio optimal signal metric of each component code decoder in 8-PSK block coded modulation systems
US5657354A · kind A · utility
36Cited by
6References
8Claims
0Family size
Inventors
Key dates
| Filing date | May 15, 1995 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | May 15, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/186
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The optimum decoding of component codes in Block Coded Modulation (BCM) schemes requires the use of the Log-Likelihood Ratio (LLR) as the signal metric. The essence of the invention is a means of accurately approximating the computation of the LLR in a way which is simple to implement directly. The invention, the Log-Likelihood Ratio Planar Approximation (LLRPA), mathematically consists solely of planar equations with fixed point arithmetic that provides both an accurate estimate of the LLR and is easily realized in electronic hardware.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.