Browsing by Author "Liu, Hsuan-Yu"

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A low-complexity synchronizer for OFDM-based UWB system
(2006-11-01)
Liu, Hsuan-Yu
;
Lee, Chen-Yi
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In current ultra-wideband (UWB) baseband synchronizer approaches, the parallel architecture is used to. achieve over 500 MSamples/s throughput requirement. Therefore achieving low power and less area becomes the challenge of UWB baseband design. In this paper, a low-complexity synchronizer combining data-partition-based correlation algorithms and dynamic-threshold design is proposed for orthogonal frequency division multiplexing based UWB system. It provides a methodology to reduce design complexity with an acceptable performance loss. Based on the data-partition algorithms, both single auto-correlator and moving-average-free matched filter are developed with 528 Msample/s throughput for the 480 Mb/s UWB design. Simulation results show the synchronization loss can be limited to 0.8-dB signal-to-noise ratio for 8% system packet-error rate.
SoC for COFDM wireless communications: Challenges and opportunities
(2006)
Lee, Chen-Yi
;
Liu, Hsuan-Yu
;
Lin, Chien-Ching
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Coded Orthogonal Frequency Division Multiplexing (COFDM) technology has been widely accepted in many communication systems due to both bandwidth efficiency and robustness to channel distortion. This opens a great of opportunities for SoC society to deal with design complexity by exploiting benefits of giga-scale integration. In this paper, we'll first review the general design concept of COFDM systems and then highlight several key issues in SoC realization. Then a system-level design flow by taking into account both performance indices and hardware complexity will be introduced. Several core modules related to COFDM system will also be addressed to see how better solutions can be achieved, especially for wireless applications. Finally two case studies on WLAN and OFDM-UWB will be discussed to demonstrate our proposals as well as to provide some directions for further research.