HyperLink   A Tiling-Scheme Viterbi Decoder in Software-Defined Radio for GPUs
Publication Year:
  Chih-Sheng Lin, Wei-Lun Liu, Wei-Ting Yeh, Li-Wen Chang, Wen-mei Hwu, Sao-Jie Chen, Pao-Ann Hsiung
  Proceedings of the 7th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM), 2011

In this paper, we propose a parallel design of Viterbi decoder for Software-Defined Radio (SDR). Our 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. Our 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 the existing GPU-based implementation, our method outperforms up to 2.5x.