| In this paper, The fundament, the system architecture and the application of Orthogonal Frequency Division Multiplexing(OFDM) were discussed, and the mathematic model of Time-varying Multi-path based on the discussion of mobile fading channel characteristic were analysed,and the channel model were discussed by computer simulation. Furthermore, the channel estimation techniques based on pilot for OFDM systems through different algorithms and improved algorithms for channel response estimation at frequency domain and time domain are inverstigated. Finally, we have analysed and compared the performance of this algorithms in the typical channel model by computer simulation.
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