Xuan Hui Wu

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This paper addresses two vital design considerations in ultrawide-band radio systems. One is that radiated power density spectrum shaping must comply with certain emission limit mask for coexistence with other electronic systems. Another is that the design of source pulses and transmitting/receiving antennas should be optimal for the performance of overall(More)
In this paper a microstrip transmission line fed compact monopole antenna for the wide-band (2. 5 GHz 11 GHz) communication system is designed and its performance is verified. In particular, we have simulated four types of wideband monopole antennas: rectangular, modified rectangular, circular and modified circular disk monopole antennas. Simple rectangular(More)
Based on single dimension of economics, IT Performance evaluation model can no longer perfectly explain IT productivity paradox. This paper proposes a multidimensional evaluation framework including social, psychological, cognitive, economic, managerial dimensions. Drawing on symbolic informatics theory, this paper analyzes several questions. What is the(More)
Ultra-wide band (UWB) wireless communication occupies a bandwidth from 3.1 to 10.6 GHz to achieve high data rate over a short distance. Two competing schemes, namely multiband orthogonal frequency-division multiplexing (MB-OFDM) and direct sequence ultra-wide band (DS-UWB) are proposed to make use of the ultra-wide bandwidth. In this paper, an(More)
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