New trends in wireless communication systems has dictated the need for dynamical adaptation of communication systems in order to suit enviromental requirements. The authors present a reformulation based VLSI architect...
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ISBN:
(纸本)0780385047
New trends in wireless communication systems has dictated the need for dynamical adaptation of communication systems in order to suit enviromental requirements. The authors present a reformulation based VLSI architecture for threhold selection for Adaptive Viterbi Decoding in wireless applications. Through reformulation of the Adaptive Viterbi Algorithm, the compare operation for threshold selection in Add Compare Select (ACS) unit is simplified from variable based to constant based and the width of path metric is reduced. The reformulated architecture results in a significant reduction of hardware complexity in both standard cell and Look Up Table (LUT) technologies. The paper describes the reformulation technique, its VLSI Architecture for Adaptive Viterbi Decoding and its implementations in both ASIC and FPGA technologies. We also demonstrate that in additon to significant reduction in datapathcomplexity, there is also a 25% to 47% storage reduction in the path Metric Memory Unit (PMU).
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