In the Wireless Communication, the multipath effects, Doppler shift, and power loss, causing by the dissemination environment, have always effected the high speed transportation of the data. On the other hand, the complexity and randomness of the wireless communication environment itself have also made the study of the wireless channel's simulation model very difficult. The Jakes model is an ideal simulation model of small-scale Rayleigh flat fading channels, and it can be realized by the superimposition of the limited LFO (low frequency oscillators). So, by the simulation of Doppler shift, the analysis of the multipath effects and taking the advantages of the Jakes model, we designed an ideal small-scale Rayleigh flat fading channel block on the SCILAB. The development of this block has not only improved the communication simulation library of the SCILAB, but also provided an effective environment of the channel for the closed-loop test of the wireless communication system. Meanwhile, the application of this channel block has also provided a reference platform for the test and construction of the wireless communication simulation system.
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