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OFDM modulation signal over Rayleigh fading channels matlab simulation

Time:11-26

SNR=10;
Ts=1;
Fd=0;
Tau=[0, 1, 2];
PDB=[0-1-2);
Signalinput=round (rand (1, 12))
Modulated_Sequence=qammod (signalinput, 16);
Signaloutput_1=awgn (Modulated_Sequence, SNR);
Chan=rayleighchan (ts, fd, tau, PDB)
Signaloutput_2=filter (chan, Modulated_Sequence);
Demod_out_1=qamdemod (signaloutput_1, 16)
Demod_out_2=qamdemod (signaloutput_2, 16)
This is my written by matlab code these days, run the but not I want results, the basic data is no rules, can you tell me where the bosses problem is?
I want to realize the function of it is a list of modulation signal, after transformation and string over Rayleigh multipath fading channel with gaussian white noise, need to know which parameters under, please?
Trouble help to look at the great god, thank you!!!!!!
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