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This study presents a new radix-4 butterfly design for Viterbi decoders. The branch symmetry of the radix-4 butterfly is exploited to design a lowcomplexity radix-4 butterfly module to simplify the implementation of the Viterbi decoder. By exploiting the branch symmetry, only a half of branch metrics need to be computed, while other metrics can be derived from the computed branches. Therefore, the branch metric computation of the radix-4 butterfly can be reduced by a factor of 2. Considering the convolutional code in the DAB system as an example, experimental results indicate that the proposed radix-4 butterfly design can reduce the number of FPGA slices of the radix-4 butterfly module by 24% over the conventional design.

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