clear all;tx_bits=randint(100000,1);M=16;EbNo=0:2:18;P_qam=10;temp=reshape(tx_bits,log2(M),[]).';tx_num=bi2de(temp,'left-msb');tx_sig=qammod(tx_num,M);%% AWGNSNR=EbNo+10*log10(log(M));for ii=1:length(SNR)     rx_sig=tx_sig+sqrt((0.5*P_qam)/(10^(SNR(ii)/10)))*(randn(size(tx_sig))+j*randn(size(tx_sig)));    rx_num=qamdemod(rx_sig,M);    rx_bits=reshape(de2bi(rx_num,log2(M),'left-msb').',1,[]).';    [num_err ber(ii)]=biterr(tx_bits,rx_bits);end%% semilogy(EbNo,ber,'r-o');xlabel('EbNo');ylabel('BER');title([num2str(M) ' QAM']);grid on;clear all;