QPSK demodulator with I and Q post-detection data correction
US4606051A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 1983 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Nov 10, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2338
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A modem receiver having receiver control, signal detection, and data demodulation implemented with a single general-purpose integrated circuit microcomputer. Novel multirate digital signal processing techniques are included which provide complete real-time recovery of all data and modem signals in a microcomputer integrated circuit having an architecture not optimized for signal processing applications. The resulting techniques extend to more general signal processing applications which may be implemented by other general-purpose microcomputers, programmed signal processors, or specific dedicated hardware logic. The novel modem receiver includes digital FIR filters, performing quadrature signal detection, and post-demodulation data correction with an all-digital second-order carrier recovery loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.