Browsing by Author "Chang, Li-Wen"

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A Tiling-Scheme Viterbi Decoder in Software Defined Radio for GPUs
(2011)
Lin, Chih-Sheng
;
Liu, Wei-Lun
;
Yeh, Wei-Ting
;
Chang, Li-Wen
;
Hwu, Wen-Mei W.
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 existing GPU-based implementation in [3], our method outperforms up to 2.5x.
Selective Device Structure Scaling and Parasitics Engineering: A Way to Extend the Technology Roadmap
(2009-02-01)
Wei, Lan
;
Deng, Jie
;
Chang, Li-Wen
;
Kim, Keunwoo
;
Chuang, Ching-Te
We propose a path for extending the technology roadmap when currently considered technology boosters (e.g., strain, high-kappa/metal gate) reach their limits and physical gate length can no longer be effectively scaled down. By judiciously engineering the device parasitic resistance and parasitic capacitance, and considering the impact of the interconnect wiring capacitance, we propose scenarios of selective device structure scaling that will enable technology scaling and contacted gate pitch scaling for several generations beyond the currently perceived limits.