sersnr.m

qam的matlab程序。m文件

%sersnr
%ser as a function of snr and M
%crj jr, revised 1/22/03

clear
clg

snr=[100:10:2000];
M=[16 64 256];
for Mind=1:length(M)
for snrind=1:length(snr)
yo=1-(1/sqrt(M(Mind)));
efa=sqrt(3*snr(snrind)/(2*(M(Mind)-1)));
ser(Mind,snrind)=1-(1-yo*erfc(efa))^2;
end
end
semilogy(10*log10(snr),ser','k')
gtext('QAM-16')
gtext('QAM-64')
gtext('QAM-256')
ylabel('SER')
xlabel('SNR in dB')
end