Ecole d'ingénieur et centre de recherche en télécommunications

Dynamic power management for the iterative decoding of turbo codes

Amador, Erick, Knopp, Raymond; Pacalet, Renaud; Rezard, Vincent

IEEE Transactions on Very Large Scale Integration Systems, Volume 20, N°11, November 2012

Turbo codes are presently ubiquitous in the context of mobile wireless communications among other application domains. A decoder for such codes is typically the most power intensive component in the baseband processing chain of a wireless receiver. The iterative nature of these decoders represents a dynamic workload. This brief presents a dynamic power management policy for these decoders. An algorithm is proposed to tune a power manageable decoder according to a prediction of the workload involved within the decoding task. By reclaiming the timing slack left when operating the decoder at a high power mode, the proposed algorithm continuously looks for opportunities to switch to a lower power mode that guarantees the task completion. We apply this technique to an LTE Turbo decoder and explore the feasibility of a VLSI implementation on a CMOS technology of 65nm. Energy savings of up to 54% were achieved with a relatively low loss in error-correction performance.

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Mots Clés:Turbo codes, LDPC codes, iterative decoding, low power design, dynamic power management.
Type:Journal
Langue:English
Ville:
Date:
Département:Communications Mobiles
Eurecom ref:3511
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Bibtex: @article{EURECOM+3511, doi = {http://dx.doi.org/10.1109/TVLSI.2011.2167765}, year = {2012}, month = {11}, title = {{D}ynamic power management for the iterative decoding of turbo codes}, author = {{A}mador, {E}rick, {K}nopp, {R}aymond and {P}acalet, {R}enaud and {R}ezard, {V}incent}, journal = {{IEEE} {T}ransactions on {V}ery {L}arge {S}cale {I}ntegration {S}ystems, {V}olume 20, {N}°11, {N}ovember 2012}, url = {http://www.eurecom.fr/publication/3511} }
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