NDLI: Robust control of decision directed loops

Content Provider	IEEE Xplore Digital Library
Author	Meyers, M.H.
Copyright Year	1989
Description	Author affiliation: AT&T Bell Lab., North Andover, MA, USA (Meyers, M.H.)
Abstract	A series of algorithms that significantly extend the range of control for decision-directed structures are presented. Experimental results show that increased control ranges of approximately 20 dB can be obtained for 64-QAM systems. The algorithms can eliminate digital radio outage due to hysteresis during dispersive multipath fading and allow for enhanced control of cross-pol interference cancelers in dual-polarized digital radio systems. The performance of 64-QAM digital radios utilizing these techniques verifies that the substantial improvements predicted by theory are realizable. Examples of performance improvements with thermal noise, FM interference, and multipath fading are given to demonstrate the power of the algorithms. Examples taken from standard production AT&T DR6-30-135 digital radio show that timing and carrier synchronization are easily maintained for 64 QAM systems at signal-to-noise ratios approaching 0 dB. The results can be applied to other communications systems and may eliminate data training sequences in many applications such as voice band modems.<>
Starting Page	1030
Ending Page	1036
File Size	557517
Page Count	7
File Format	PDF
DOI	10.1109/ICC.1989.49841
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1989-06-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Robust control Digital communication Control systems Fading Hysteresis Dispersion Radio control Interference elimination Interference cancellation Noise cancellation
Content Type	Text
Resource Type	Article

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