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The modulators are the basic requirement of the communication systems they are designed to reduce the channel distortion & to use in RF communication hence many type of carrier modulation techniques has been already proposed according to channel properties & data rate of the system. Here, the authors are proposing the FPGA based QPSK modulator with analog filters, the proposed system has many advantages over traditional QPSK modulators such as reduced cost, better stability, less complexity. The simulation of the system proves all the features mention above. They have designed the system using VHDL codes in Xilinx & analog filter simulation in Matlab.
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