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Area-efficient architectures for the Viterbi algorithm. I. Theory

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5 Author(s)
Shung, C.B. ; Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Horng-Dar Lin ; Cypher, R. ; Siegel, P.H.
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In the state-parallel implementation of the Viterbi algorithm, one add-compare-select (ACS) unit is devoted to each state in the treillis. A systematic approach to partitioning, scheduling, and mapping N trellis states to P ACSs, where N>P , is presented here. The area saving of this architecture comes from the reduced number of ACSs and interconnection wires. The design of the ACS, path metric storage, and routing network is discussed in detail. The proposed architecture creates internal parallelism due to the ACS sharing, which can be exploited to increase the throughput rate by pipelining. Consequently, the architecture offers a favorable (smaller) area-time product, compared to the state-parallel implementation

Published in:

Communications, IEEE Transactions on  (Volume:41 ,  Issue: 4 )

Date of Publication:

Apr 1993

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