| Summary: | 碩士 === 樹德科技大學 === 電腦與通訊研究所 === 91 === Following communication technology progress, from wired communication to wireless communication, in order to save the limited bandwidth resource, provide high quality communication service and resist frequency selective fading channel, OFDM technique is presented to solve many problems. There are a lot of interference exist in wireless channel. In order to enhance the system efficiency, a good channel estimator is necessary. In this thesis, we exploit pilot assisted channel estimation. Firstly, Pilot symbols are inserted into transmitted signal by periodic. In receiver, channel frequency response is obtained by utilizing least square method, and use interpolation method to get channel frequency response of subchannel and exact restore signal. In simulation, we make use of this method to traditional equalizer and compare efficiency which is presented by scholar of Won Gi Jeon , Kyung Hi Chang and Yong Soo Cho.
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