NDLI: A fast block-based nonlinear decoding algorithm for /spl Sigma//spl Delta/ modulators

Content Provider	IEEE Xplore Digital Library
Author	Hein, S.
Copyright Year	1991
Abstract	Previous work has established that the digital output of a /spl Sigma//spl Delta/ modulator as an A/D converter contains more information about the analog input than is extracted with conventional linear filtering. Under reasonable mathematical assumptions, optimal nonlinear decoding of the digital output can achieve significantly larger signal-to-noise ratios than linear filtering. However, the hitherto proposed decoding algorithms only demonstrate conceptual feasibility and are impractical from a computational point of view. We present a new block-based decoding algorithm that, like previous work, employs projections onto convex sets. The algorithm owes its speed to a change of projection norm, an accelerated convergence scheme, and a decimation-like subsampling; it is on the order of 10/sup 4/-10/sup 5/ times faster than one previously published algorithm for typical parameter values, and about 2-10 times slower than linear decoding. The new algorithm is applicable to all currently popular /spl Sigma//spl Delta/ architectures.<>
Sponsorship	IEEE Signal Processing Society
Starting Page	1360
Ending Page	1367
Page Count	8
File Size	854484
File Format	PDF
ISSN	1053587X
Volume Number	43
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delta modulation Maximum likelihood detection Iterative decoding Digital modulation Data mining Signal to noise ratio Timing Acceleration Convergence Bandwidth
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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