NDLI: Reducing the number of iterations in iterative demodulation with turbo decoding

Content Provider	IEEE Xplore Digital Library
Author	Haddad, S. Baghdadi, A. Jezequel, M.
Copyright Year	2011
Description	Author affiliation: Institut Telecom; Telecom Bretagne; UMR CNRS 3192 Lab-STICC, Electronics Department, Technopôle Brest Iroise CS 83818, 29238 Brest, France (Haddad, S.; Baghdadi, A.; Jezequel, M.)
Abstract	Iterative processing is widely adopted nowadays in modern wireless receivers for advanced channel codes like turbo and LDPC codes. Extension of this principle with an additional iterative feedback loop to the demapping function has proven to provide substantial error performance gain. However, the adoption of iterative demodulation with turbo decoding is constrained by the additional implied implementation complexity, heavily impacting latency and power consumption. In this paper, we analyze the convergence speed of these combined two iterative processes in order to determine the exact required number of iterations at each level. Extrinsic information transfer (EXIT) charts are used for a thorough analysis at different modulation orders and code rates. An original iteration scheduling is proposed reducing two demapping iterations with reasonable performance loss of less than 0.15 dB. Analyzing the computational and memory access complexity, which directly impact latency and power consumption, demonstrate the considerable gains of the proposed scheduling and the promising contributions of the proposed analysis.
Starting Page	1
Ending Page	6
File Size	307579
Page Count	6
File Format	PDF
ISBN	9781457714399
e-ISBN	9789532900262
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-15
Publisher Place	Croatia
Access Restriction	Subscribed
Rights Holder	University of Split
Subject Keyword	Fading Modulation Decoding Complexity theory Iterative decoding Gain Convergence
Content Type	Text
Resource Type	Article

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