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Phase ambiguity resolution for offset qpsk modulation systems
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1991 |
| Description | A demodulator for Offset Quaternary Phase Shift Keyed (OQPSK) signals modulated with two words resolves eight possible combinations of phase ambiguity which may produce data error by first processing received I(sub R) and Q(sub R) data in an integrated carrier loop/symbol synchronizer using a digital Costas loop with matched filters for correcting four of eight possible phase lock errors, and then the remaining four using a phase ambiguity resolver which detects the words to not only reverse the received I(sub R) and Q(sub R) data channels, but to also invert (complement) the I(sub R) and/or Q(sub R) data, or to at least complement the I(sub R) and Q(sub R) data for systems using nontransparent codes that do not have rotation direction ambiguity. |
| File Size | 1294696 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19910016004 |
| Archival Resource Key | ark:/13960/t0dv6fn5q |
| Language | English |
| Publisher Date | 1991-06-18 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Phase Shift Keying Coding Digital Techniques Synchronism Signal Processing Phase Lock Demodulators Decoding Resolution Ambiguity Demodulation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
