Design of a high-throughput low-power IS95 Viterbi decoder

The design of high-throughput large-state Viterbi decoders relies on the use of multiple arithmetic units. The global communication channels among these parallel processors often consist of long interconnect wires, resulting in large area and high power consumption. In this paper, we propose a data-transfer oriented design methodology to implement a low-power 256-state rate-1/3 IS95 Viterbi decoder. Our architectural level scheme uses operation partitioning, packing, and scheduling to analyze and optimize interconnect effects in early design stages. In comparison with other published Viterbi decoders, our approach reduces the global data transfers by up to 75% and decreases the amount of global buses by up to 48%, while enabling the use of deeply pipelined datapaths with no data forwarding. In the RTL implementation of the individual processors, we apply precomputation in conjunction with saturation arithmetic to further reduce power dissipation with provably no coding performance deg...

• Type: Conference
• Year: 2002
• Where: DAC
• Authors: Xun Liu, Marios C. Papaefthymiou
• Keywords: DAC 2002, Design Automation, Global Data Transfers, Large-state Viterbi Decoders, Reduce Power Dissipation