Quantizer that uses optimum decision thresholds
US6292126A · kind A · utility
7Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1998 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Apr 16, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/062
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Disclosed is a quantizer that uses optimum decision thresholds that are determined by the average of the optimum reconstruction levels of a detected signal in the presence of noise. The Lloyd-Max Quantizer is used to determine the optimum reconstruction levels y.sub.K using a minimum means squared error technique. Decision thresholds x.sub.K are therefore established at levels where influences of noise or other distortions are equally likely to occur between adjacent transmitted points. The present invention can be utilized in quadrature amplitude modulation (QAM) systems or any quantizer design that quantizes an analog signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.