Method and system for implementing a baseband compression scheme for a nonlinear multiplying up-converter for QPSK and OQPSK
US7289424B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2002 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Oct 7, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/20
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system for implementing a base band compression scheme for a nonlinear multiplying up-converter for QPSK and OQPSK includes a bit combining module, a quadrant remap module, a look-up table (LUT) and a zoom adjust module. The bit combining module is configured to generate an address based on a number of symbols received as input data. Using the address provided by the bit combining module, the quadrant remap module remaps symbols from quadrants “2”, “3” and “4” to quadrant “1” and generates signals to look up corresponding output data from the LUT. The zoom adjust module generates a number of solutions corresponding to the input data using the corresponding output data retrieved from the LUT. The zoom adjust module is then used to select the best output from the solutions to provide a smooth output signal that does not have any discontinuities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.