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High-throughput flexible constraint length Viterbi decoders on de Bruijn, shuffle-exchange and butterfly connected architectures

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4 Author(s)
Ganesh Garga ; Centre for Electronics Design and Technology, Indian Institute of Science, Bangalore, India ; David Guevorkian ; S. K Nandy ; H. S Jamadagni

Flexible constraint length channel decoders are required for software defined radios. This paper presents a novel scalable scheme for realizing flexible constraint length Viterbi decoders on a de Bruijn interconnection network. Architectures for flexible decoders using the flattened butterfly and shuffle-exchange networks are also described. It is shown that these networks provide favourable substrates for realizing flexible convolutional decoders. Synthesis results for the three networks are provided and a comparison is performed. An architecture based on a 2D-mesh, which is a topology having a nominally lesser silicon area requirement, is also considered as a fourth point for comparison. It is found that of all the networks considered, the de Bruijn network offers the best tradeoff in terms of area versus throughput.

Published in:

Systems, Architectures, Modeling, and Simulation, 2009. SAMOS '09. International Symposium on

Date of Conference:

20-23 July 2009