Title :
A Low-Power Viterbi Decoder Based on Scarce State Transition and Variable Truncation Length
Author :
Lin, Dah-Jia ; Lin, Chien-Ching ; Chen, Chih-Lung ; Chang, Hsie-Chia ; Lee, Chen-Yi
Author_Institution :
Nat. Chiao Tung Univ., Hsinchu
Abstract :
The ACS computation and the survivor memory are most power critical, consuming about 90% power in the Viterbi decoder. Based on the low power mechanisms, the scarce state transition (SST) technique and the variable truncation length, we present a Viterbi decoder for the MB-OFDM UWB applications. The SST scheme lowers state transition as well as signal switches in the ACS units. Moreover, the decoding with variable truncation length leads to the access reduction in the survivor memory. The experimental results show more than 30% power reduction under high SNRs as compared to those without SST and variable truncation length.
Keywords :
OFDM modulation; VLSI; Viterbi decoding; convolutional codes; low-power electronics; ultra wideband communication; MB-OFDM UWB applications; SNR; convolutional codes; low power mechanisms; low-power Viterbi decoder; scarce state transition; scarce state transition technique; survivor memory; variable truncation length; Convolutional codes; Decoding; Energy consumption; Information retrieval; Merging; Power engineering and energy; Power engineering computing; Registers; Switches; Viterbi algorithm;
Conference_Titel :
VLSI Design, Automation and Test, 2007. VLSI-DAT 2007. International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
1-4244-0583-1
Electronic_ISBN :
1-4244-0583-1
DOI :
10.1109/VDAT.2007.373220
