M=8;
k=log2（M）;
n=1.2e6;
samp=1;
coderate=1;

x=randi（[01]1n）;
xreshape=reshape（xn/kk）;
xsym=bi2de（xreshape‘left-msb‘）;

h_mod1?=?modem.genqammod（‘Constellation‘[1j*（0.75^0.5+0.5）-1j*（0.75^0.5+0.5）...
?????????????????????????????????????????????????0.75^0.5+0.5-（0.75^0.5+0.5）...
????????????????????????????????????????????????????????0.5+1j*0.50.5-1j*0.5...
????????????????????????????????????????????????????????-0.5+1j*0.5-0.5-1j*0.5]...
????????????????????????????????????????????????????????‘InputType‘‘integer‘）;
h_demod1?=?modem.genqamdemod（‘Constellation‘[1j*（0.75^0.5+0.5）-1j*（0.75^0.5+0.5）...
?????????????????????????????????????????????????0.75^0.5+0.5-（0.75^0.5+0.5）...
????????????????????????????????????????????????????????0.5+1j*0.50.5-1j*0.5...
????????????????????????????????????????????????????????-0.5+1j*0.5-0.5-1j*0.5]...
????????????????????????????????????????????????????????‘OutputType‘‘integer‘）;????????????????????????????????????????????

y1?=?modulate（h_mod1xsym）;
EbNO_in_dB=4:1:13;
num?=?length（EbNO_in_dB）;
num_of_errors=zeros（4num）;
bit_error_rate=zeros（4num）;
snr?=?EbNO_in_dB?+?10*log10（k）+10*log10（coderate）-10*log10（samp）;
%?snr=?10.^（snr/10）;
for?m?=?1:num
????yn1?=?awgn（y1?snr（m）?‘measured‘）;
????zsym1?=?demodulate（h_demod1yn1）;
????z1?=?reshape（de2bi（zsym1?‘left-msb‘）?1?n）;
????[num_of_errors（1m）bit_error_rate（1m）]?=?biterr（xz1）;
end

plot（snr?log10（bit_error_rate（11:num））‘-+k‘）;
xlabel（‘SNR/dB‘）ylabel（‘BER‘）;
title（‘BER曲線‘）;axis（[0?20?-5?0]）;
grid?on
%?hold?on
%?plot（snr?log10（bit_error_rate（21:num））‘-ob‘）;
%?hold?on
%?plot（snr?log10（bit_error_rate（31:num））‘-xr‘）;
%?hold?on
%?plot（snr?log10（bit_error_rate（41:num））?‘-*m‘）;
legend（‘8QAM‘）

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????1798??2018-09-16?09:20??誤碼率計(jì)算\A8QAM.m
?????文件????????1652??2018-09-15?22:04??誤碼率計(jì)算\QPSK.m
?????文件?????????785??2018-09-15?20:35??誤碼率計(jì)算\demodu_8qam_mat.m
?????目錄???????????0??2018-09-16?09:55??誤碼率計(jì)算\