QAM.rar_OFDM QAM_matlab_ofdm_qam_somewhereb5u

function output_bit = demod(input_mod,jum_sim) norm=[1 sqrt(42)]; %sqrt(2) sqrt(6) sqrt(10) sqrt(20) input_mod = input_mod*norm(jum_sim); q_len=length(input_mod); inI = real(input_mod); inQ = imag(input_mod); output_bit = zeros(1,length(input_mod)*jum_sim); switch jum_sim case 1 qam4_demod_IQ = [0 1]; %carrier recovery idx=find(inI)>1; inI(idx)=1; idx=find(inI)<-1; inI(idx)=-1; idx=find(inQ)>1; inQ(idx)=1; idx=find(inQ)<-1; inQ(idx)=-1; %balance detector 4-QAM output_bit(1:2:end)=qam4_demod_IQ(round((inI+1)/2) +1); output_bit(2:2:end)=qam4_demod_IQ(round((inQ+1)/2) +1); case 2 qam16_demod_IQ = [0 1 3 2]; %carrier recovery idx=find(inI)>3; inI(idx)=3; idx=find(inI)<-3; inI(idx)=-3; idx=find(inQ)>3; inQ(idx)=3; idx=find(inQ)<-3; inQ(idx)=-3; %balance detector 16-QAM tmp=round((inI+3)/2)+1; output_bit(1:4:end)=bitget(qam16_demod_IQ(tmp),2); output_bit(2:4:end)=bitget(qam16_demod_IQ(tmp),1); tmp=round((inQ+3)/2)+1; output_bit(3:4:end)=bitget(qam16_demod_IQ(tmp),2); output_bit(4:4:end)=bitget(qam16_demod_IQ(tmp),1); case 3 qam64_demod_IQ = [0 1 3 2 6 7 5 4]; %carrier recovery idx=find(inI)>7; inI(idx)=7; idx=find(inI)<-7; inI(idx)=-7; idx=find(inQ)>7; inQ(idx)=7; idx=find(inQ)<-7; inQ(idx)=-7; %balance detector 16-QAM tmp=round((inI+7)/2)+1; output_bit(1:6:end)=bitget(qam64_demod_IQ(tmp),3); output_bit(2:6:end)=bitget(qam64_demod_IQ(tmp),2); output_bit(3:6:end)=bitget(qam64_demod_IQ(tmp),1); tmp=round((inQ+7)/2)+1; output_bit(4:6:end)=bitget(qam64_demod_IQ(tmp),3); output_bit(5:6:end)=bitget(qam64_demod_IQ(tmp),2); output_bit(6:6:end)=bitget(qam64_demod_IQ(tmp),1); end