Home and abroad, the M/W intermediary service bandwidth is between 3 and 30 GHz. However, recently the bandwidth is getting insufficient due to the increasing number of services and the capacities. Thus FPU (Field Pick UP) Transmission System, the mobile broadcasting intermediary link, needs to be evaluated in the system capacity by means of simulation in order to estimate whether or not the number of channels and the places are changeable when the bandwidth is rearranged in the future. In this paper, we have modeled of Digital FPU link system in M/W band portable digital wireless transmission system. Also, we analyzed digital FPU system performance adopt adaptive modulation scheme in variable channel environment.
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