QAM spread spectrum demodulation system
US6088402A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 1996 |
| Grant date | Jul 11, 2000 |
| Priority date | — |
| Expiry date | Jul 31, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D3/009
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A demodulation arrangement is disclosed which comprises a mixing circuit for deriving in-phase (I) and quadrature (Q) signals in a digital form from a received signal. The I and Q signals can then be input to a look-up table configured to output at least a data output value corresponding to a symbol constellation point and a corresponding phase output value, both selectable using. A phase processor is arranged to receive the phase output value and to calculate a phase angle value of the received signal. The phase angle value is returned as a further input to the look-up table to supplement the I and Q signals for selection of at least the data output value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.