Papers by Author: Xiao Hong Shen

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Authors: Hai Xia Jing, Zheng Guo Liu, Hai Yan Wang, Xiao Hong Shen
Abstract: Fast and convenient configuration of the industrial equipment will help engineers to complete their work more efficiently in the industrial field. At present, most industrial equipment is configurated by a personal computer with specific configuration software. A design method for portable configuration equipment is proposed, which uses the Samsung S3C2440 SoC chip and develops the configuration software based on the Microsoft WinCE operating system. Compared with the previous industrial control computer, this equipment has the following merits: low consumption, miniaturization, expandability and intellectualization, which has been applied successfully in Xi’an Xianyang Kunning Microelectronics Institute for its isolated KN5000 Series product configuration.
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Authors: Qing Wen Chang, Xiao Hong Shen, Juan Chang
Abstract: Doppler shift decreases the estimation accuracy of carrier frequency and may result in divergent estimation. It thus degrades the performance of orthogonal frequency division multiplexing (OFDM) underwater acoustic (UWA) communication system. In this paper, the two-step Doppler shift mitigation scheme[4] was adopted to mitigate the Doppler effect. The innovation lied in the second step in which an enhanced carrier frequency offset (CFO) two-time estimation approach on basis of the pilot was proposed to improve the Doppler shift mitigation scheme. In addition, the new Doppler shift mitigation scheme with the proposed approach was implemented in the OFDM communication system under the simulated multipath-spread channel environment. The experiment results show that the new scheme is able to improve the performance of OFDM UWA communication significantly.
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