A Tiling-Scheme Viterbi Decoder in Software Defined Radio for GPUs

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Provided by: National Chung Cheng University
Topic: Hardware
Format: PDF
In this paper, the authors propose a parallel design of Viterbi decoder for Software-Defined Radio (SDR). Their method implements a divide-and-conquer approach by tiling decoding sequences, performing independent speculated Viterbi decoding, and merging partial candidate paths into the final path. For each independent Viterbi decoding, the best path is selected by calculating Hamming distances trellis-by-trellis in parallel. They method shows up to 14.6x speedup on an NVIDIA 8800 GTX over a sequential C implementation on a 2.4GHz Intel Core 2 CPU. Also, compared with existing GPU-based implementation in, their method outperforms up to 2.5x.
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