hi every one,
thanks for the reply. i tried to change the parameter like 6 and 8 bit per symbol at the QAM modulator and demodulator. that file 16QAM modulator MIN BER value quite well at the datarate upto 40Gb/s the distance maximum 100km with 10GHz carrier frequency. but 64 & 256QAM MIN BER cant found margin value.
pls post necessary one.