gusucode.com > m4k20功率分配图 mimo功率优化,OFDM典型仿真程序,贪婪算法仿真程序 > code/test_16qam/qammod.m
% Program 3-23 % qammod.m % % This function is used for Gray coding of 16QAM modulation % % programmed by R.Funada and H.Harada % function [iout,qout]=qammod(paradata,para,nd,ml) %****************** variables ************************* % paradata : input data (para-by-nd matrix) % iout :output Ich data % qout :output Qch data % para : Number of paralell channels % nd : Number of data % ml : Number of modulation levels % (QPSK ->2 16QAM -> 4) % ***************************************************** % The constellation power k=sqrt(10); iv=[-3 -1 3 1]; m2=ml/2; count2=0; for ii=1 : nd isi = zeros(para,1); isq = zeros(para,1); for jj=1 : ml if jj <= m2 isi = isi +2.^( m2- jj ).*paradata((1:para),count2+jj); else isq = isq +2.^( ml- jj ).*paradata((1:para),count2+jj); end end iout((1:para),ii) = iv(isi+1)./k; qout((1:para),ii) =iv(isq+1)./k; count2=count2+ml; end %******************** end of file ***************************