NDLI: On the bit-error probability of differentially encoded QPSK and offset QPSK in the presence of carrier synchronization

Content Provider	IEEE Xplore Digital Library
Author	Simon, M.K.
Copyright Year	1972
Abstract	We investigate the differences between allowable differential encoding strategies and their associated bit-error probability performances for quadrature phase-shift keying (QPSK) and offset QPSK modulations when the carrier demodulation reference signals are supplied by the optimum (motivated by maximum a posteriori estimation of carrier phase) carrier-tracking loop suitable for that modulation. In particular, we show that in the presence of carrier-synchronization phase ambiguity but an otherwise ideal loop, both the symbol and bit-error probabilities in the presence of differential encoding are identical for the two modulations. On the other hand, when in addition the phase error introduced by the loop's finite signal-to-noise ratio is taken into account, it is shown that the two differentially encoded modulations behave differently, and their performances are no longer equivalent. A similar statement has previously been demonstrated for the same modulations when the phase ambiguity was assumed to have been perfectly resolved by means other than differential encoding.
Starting Page	806
Ending Page	812
Page Count	7
File Size	300313
File Format	PDF
ISSN	00906778
Volume Number	54
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Quadrature phase shift keying Phase modulation Encoding Performance evaluation Decoding Phase shift keying Phase detection Demodulation Signal to noise ratio Signal resolution differentially encoded quadrature phase-shift keying (DE-QPSK) Bit-error probability (BEP) carrier synchronization differentially encoded offset QPSK (DE-OQPSK)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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