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Low-Power Limited-Search Parallel State Viterbi Decoder Implementation Based on Scarce State Transition

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2 Author(s)
Jie Jin ; Hong Kong Univ. of Sci. and Technol., Kowloon ; Chi-ying Tsui

In this paper, a low-power Viterbi decoder design based on scarce state transition (SST) is presented. A low complexity algorithm based on a limited search algorithm, which reduces the average number of the add-compare-select computation of the Viterbi algorithm, is proposed and seamlessly integrated with the SST-based decoder. The new decoding scheme has low overhead and facilitates low-power implementation for high throughput applications. We also propose an uneven-partitioned memory architecture for the trace-back survivor memory unit to reduce the overall memory access power. The new Viterbi decoder is designed and implemented in TSMC 0.18-mum CMOS process. Simulation results show that power consumption is reduced by up to 80% for high throughput wireless systems such as Multiband-OFDM Ultra-wideband applications.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:15 ,  Issue: 10 )