Title :
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
fDate :
9/1/1988 12:00:00 AM
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;
Journal_Title :
Communications, IEEE Transactions on
