NDLI: Traceback-Based Optimizations for Maximum a Posteriori Decoding Algorithms

Content Provider	Springer Nature Link
Author	Schurgers, Curt Chandrakasan, Anantha
Copyright Year	2008
Abstract	Maximum A Posteriori (MAP) decoding is a crucial enabler of turbo coding and other powerful feedback-based algorithms. To allow pervasive use of these techniques in resources constrained systems, it is important to limit their implementation complexity, without sacrificing the superior performance they are known for. We show that introducing traceback information into the MAP algorithm, thereby leveraging components that are also part of Soft-Output Viterbi Algorithms (SOVA), offers two unique possibilities to simplify the computational requirements. Our proposed enhancements are effective at each individual decoding iteration and therefore provide gains on top of existing techniques such as early termination and memory optimizations. Based on these enhancements, we will present three new architectural variants for the decoder. Each one of these may be preferable depending on the decoder memory hardware requirements and number of trellis states. Computational complexity is reduced significantly, without incurring significant performance penalty.
Starting Page	231
Ending Page	241
Page Count	11
File Format	PDF
ISSN	19398018
Journal	Journal of Signal Processing Systems
Volume Number	53
Issue Number	3
e-ISSN	19398115
Language	English
Publisher	Springer US
Publisher Date	2008-05-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	error correction coding MAP estimation very-large-scale integration Computer Imaging, Vision, Pattern Recognition and Graphics Pattern Recognition Image Processing and Computer Vision Electronic and Computer Engineering Circuits and Systems Signal, Image and Speech Processing
Content Type	Text
Resource Type	Article
Subject	Theoretical Computer Science Signal Processing Control and Systems Engineering Information Systems Modeling and Simulation Hardware and Architecture

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