Robust non-coherent detector for .pi./4-DQPSK signals
US5526381A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1994 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | May 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2332
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A technique of demodulating a .pi./4-DQPSK composite carrier waveform using a non-coherent discriminator based receiver is presented. In particular, a means of recovering .pi./4-DQPSK modulated data symbols using a dual output discriminator in conjunction with a dual binary amplitude detection process in a discriminator based receiver is discussed. Means which improve the bit error rate of the receiver over the prior art are presented. Additionally, an amplitude detection means which readily provides synchronization of the detected data symbols is discussed which was not heretofore possible with the 4-level slicer of the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.