Method for deciding region of PI/4 shift quadriphase shift keying modulated signals
US5230009A · kind A · utility
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4Claims
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Key dates
| Filing date | Jul 9, 1991 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Jul 9, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2331
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
First two dimensional plane is defined by phase of modulated signal and first vector corresponding to first signal point to be decided is defined. Then, first inner product by the first vector and second vector corresponding to last decided signal point is made and the second vector is transformed into third vector which is ninety degrees advanced. Next, second inner product of the first vector and third vector is made and the region of the first signal is decided in the two dimensional plane in accordance with the first and second inner product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.