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

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2 Author(s)
McGuffin, B.F. ; Stanford Telecommun. Inc., Reston, VA, USA ; Kwong, P.

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

Published in:

Communications, IEEE Transactions on  (Volume:36 ,  Issue: 9 )

Date of Publication:

Sep 1988

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