Variable wordlength soft-decision Viterbi decoder for power-efficient wireless LAN

Authors:
Jaeseong Kim;Shingo Yoshizawa;Yoshikazu Miyanaga
Affiliations:
Graduate School of Information Science and Technology, Hokkaido University, Kita-ku, Sapporo 060-0814, Japan;Graduate School of Information Science and Technology, Hokkaido University, Kita-ku, Sapporo 060-0814, Japan;Graduate School of Information Science and Technology, Hokkaido University, Kita-ku, Sapporo 060-0814, Japan
Venue:
Integration, the VLSI Journal
Year:
2012

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Abstract

This paper describes the design of a new, variable wordlength, soft-decision Viterbi decoder that can significantly reduce power dissipation in wireless local area network (LAN) hardware. By taking into account the dynamic range of the time-varying channel coefficients, the quantization level is adjusted to suit the observed instantaneous link quality, i.e., the decoder wordlength is adjusted to maintain efficient throughput requirements and low power dissipation. A dynamic voltage scaling is applied with a variable wordlength to significantly reduce power consumption in the soft-decision Viterbi decoder. Unlike the conventional 8-bit fixed-wordlength decoder, our radix-4 Viterbi decoder can reduce power consumption by up to 35% under AWGN and multipath fading channel conditions.