NDLI: Asynchronous timing recovery in DSP based PSK modems

Content Provider	IEEE Xplore Digital Library
Author	Koblents, B. McLane, P.J.
Copyright Year	1992
Description	Author affiliation: Dept. of Electr. Eng., Queen's Univ., Kingston, Ont., Canada (Koblents, B.; McLane, P.J.)
Abstract	Fully digital asynchronous timing recovery has been demonstrated to give excellent results in laboratory experiments on speech rate (2400 and 4800 b/s) modems with both rectangular and RC pulse shaping. F.M. Gardner's (1986) zero crossing tracker timing error detector has been applied to rectangular and RC-pulse-shaped speech-rate modems with good results on the additive noise channel. The nondata-aided (NDA) form of the zero crossing tracker has been found to be immune to pattern noise for any data phase transition, making it ideal for timing error detection in M-PSK and M-DPSK systems with M>4. In RC-pulse-shaped systems with alpha down to 60%, intersymbol interference (ISI) induced self noise is sufficiently controlled by loop filtering. For systems with a limited number of samples per symbol, polyphase filter interpolation can be used to improve performance.
Starting Page	632
Ending Page	641
File Size	536852
Page Count	10
File Format	PDF
ISBN	0818631600
ISSN	10586393
DOI	10.1109/ACSSC.1992.269195
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1992-10-26
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Timing Digital signal processing Phase shift keying Modems Intersymbol interference Laboratories Speech Pulse shaping methods Detectors Additive noise
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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