qam_16.m

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function dsymb=QAM_16(numbits,d)  %16_QAM调制
for n=1:4:numbits % 16QAM调制是4个比特调制成一个符号，调制规则按照36.211协议的第73页
    if d(n)==0&d(n+1)==0&d(n+2)==0&d(n+3)==0 
        select=1;
    elseif d(n)==0&d(n+1)==0&d(n+2)==0&d(n+3)==1
        select=2;
    elseif d(n)==0&d(n+1)==0&d(n+2)==1&d(n+3)==0 
        select=3;
    elseif d(n)==0&d(n+1)==0&d(n+2)==1&d(n+3)==1 
        select=4;
    elseif d(n)==0&d(n+1)==1&d(n+2)==0&d(n+3)==0 
        select=5;
    elseif d(n)==0&d(n+1)==1&d(n+2)==0&d(n+3)==1 
        select=6;
    elseif d(n)==0&d(n+1)==1&d(n+2)==1&d(n+3)==0 
        select=7;
    elseif d(n)==0&d(n+1)==1&d(n+2)==1&d(n+3)==1 
        select=8;
    elseif d(n)==1&d(n+1)==0&d(n+2)==0&d(n+3)==0 
        select=9;
    elseif d(n)==1&d(n+1)==0&d(n+2)==0&d(n+3)==1 
        select=10;
    elseif d(n)==1&d(n+1)==0&d(n+2)==1&d(n+3)==0 
        select=11;
    elseif d(n)==1&d(n+1)==0&d(n+2)==1&d(n+3)==1 
        select=12;
    elseif d(n)==1&d(n+1)==1&d(n+2)==0&d(n+3)==0 
        select=13;
    elseif d(n)==1&d(n+1)==1&d(n+2)==0&d(n+3)==1 
        select=14;
    elseif d(n)==1&d(n+1)==1&d(n+2)==1&d(n+3)==0 
        select=15;
    else d(n)==1&d(n+1)==1&d(n+2)==1&d(n+3)==1 
        select=16;
    end
    switch select  
        case 1
          Re=1/sqrt(10); 
          Im=1/sqrt(10);
        case 2
          Re=1/sqrt(10); 
          Im=3/sqrt(10);
        case 3
          Re=3/sqrt(10); 
          Im=1/sqrt(10);
        case 4
          Re=3/sqrt(10); 
          Im=3/sqrt(10);
        case 5
          Re=1/sqrt(10); 
          Im=-1/sqrt(10);
        case 6
          Re=1/sqrt(10); 
          Im=-3/sqrt(10);
        case 7
          Re=3/sqrt(10); 
          Im=-1/sqrt(10);
        case 8
          Re=3/sqrt(10); 
          Im=-3/sqrt(10);
        case 9
          Re=-1/sqrt(10); 
          Im=1/sqrt(10);
        case 10
          Re=-1/sqrt(10); 
          Im=3/sqrt(10);
        case 11
          Re=-3/sqrt(10); 
          Im=1/sqrt(10);
        case 12
          Re=-3/sqrt(10); 
          Im=3/sqrt(10);
        case 13
          Re=-1/sqrt(10); 
          Im=-1/sqrt(10);
        case 14
          Re=-1/sqrt(10); 
          Im=-3/sqrt(10);
        case 15
          Re=-3/sqrt(10); 
          Im=-1/sqrt(10);
        case 16
          Re=-3/sqrt(10); 
          Im=-3/sqrt(10);
    end
    if n == 1;
        k = 1;
        dsymb(k)=Re+j*Im;
    else if n > 1 ;
            k = ceil (n / 4) ;
            dsymb(k)=Re+j*Im;
        end
    end
end
% 输出的为经过16QAM调制的符号。