Non-coherent pattern detection
US4847868A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Feb 22, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/38
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention is directed to a digital non-coherent pattern detection scheme in which spectral analysis of phase encoded signals is utilized to provide pattern recognition. The present invention is relatively insensitive to the power level of incoming signals. Since the power level is easily detected and determined, the present invention allows the various algorithms to operate quickly. Further, utilizing the magnitude samples of the incoming signal result in a pattern detection scheme that is independent of modulation technique. The present invention utilizes the concept of spectral analysis to determine spectral lines which are present in phase encoded signals. A phase encoded signal such as a DPSK or QAM having an implicit pattern contained therein, which results in unique spectral lines. By detecting the spectral lines in certain combinations, the phase encoded pattern being sent may be identified. For example, "unscrambled mark", "S1", and other patterns may be identified using the method of the present invention. In operation, a plurality of receive channels are implemented to detect energy levels at specific frequencies and thereby identify spectral lines. The input …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.