π/4 QPSK modulator
US6873661B1 · kind B1 · utility
2Cited by
8References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 23, 2000 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Dec 28, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2092
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of π/4-shift QPSK modulation and π/4-shift QPSK modulator are provided. The modulator address symbols from a Precursor section of a register to a first memory portion and from a Postcursor section of the register to a second memory portion at odd times and, address symbols from the Precursor section to said second memory portion and from said Postcursor section to said first memory portion at even times. The modulator uses reversed addressing for Postcursor symbols in accessing the said first and second memory portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.