I/Q channel reversal correcting properties of an SQPSK Costas loop with integrated symbol synchronization

Author

McGuffin, B.F. ; Kwong, Paulman

Author_Institution

Stanford Telecommun. Inc., Reston, VA, USA

Volume

36

Issue

9

fYear

1988

fDate

9/1/1988 12:00:00 AM

Firstpage

1082

Lastpage

1086

Abstract

An integrated-carrier loop/symbol synchronizer, using a digital Costas loop with matched arm filters to demodulate staggered quaternary phase-shift keyed (QPSK) signals, is analyzed. An expression is derived for the S curve, parameterized by bit synchronization error. This result suggests that the demodulator structure offers an inherent I/Q channel reversal correcting capability. Computer simulation results are presented that support this conclusion, and suggest that ambiguity resolution performance depends on the ratio of carrier and synchronization loop bandwidths

Keywords

demodulation; demodulators; digital communication systems; phase shift keying; signal processing; synchronisation; telecommunication channels; I/Q channel reversal correcting properties; QPSK; SQPSK Costas loop; ambiguity resolution performance; bit synchronization error; computer simulation; demodulation; digital Costas loop; integrated symbol synchronization; matched arm filters; staggered quaternary phase shift keyed signals; synchronization loop; Circuits; Computer simulation; Data mining; Demodulation; Digital filters; Matched filters; Signal analysis; Signal resolution; Timing; Tracking loops;

fLanguage

English

Journal_Title

Communications, IEEE Transactions on

Publisher

ieee

ISSN

0090-6778

Type

jour

DOI

10.1109/26.7522

Filename

7522