mqam_snr_sc_threetr.m

MIMO系统

%MQAM_SNR-SC---Sfunction
function [sys,x0,str,ts]=MQAM_SNR_SC_threeTR(t,x,u,flag,L,BitRate)
j=sqrt(-1);
M=16;
d=1;
% 对应的星座图
mapping=[-3*d+j*3*d;
         -d+j*3*d;
         d+j*3*d;
         3*d+j*3*d;
         -3*d+j*d;
         -d+j*d;
         d+j*d;
         3*d+j*d;
         -3*d-j*d;
         -d-j*d;
         d-j*d;
         3*d-j*d;
         -3*d-j*3*d;
         -d-j*3*d;
         d-j*3*d;
         3*d-j*3*d];

switch flag,
    case 0
        [sys,x0,str,ts]=mdlInitializeSizes(L,BitRate);%初始化模块
    case 3
        sys=mdlOutputs(t,x,u,L,BitRate,M,mapping);%计算输出
    case {1,2,4,9}
        sys=[];%无用的标志
    otherwise
        error(['Unhandled flag =',num2str(flag)]);%错误处理
end
%模块结束
%%%%%%%初始化状态、采样周期、Size结构%%%%%%%%%
function [sys,x0,str,ts]=mdlInitializeSizes(L,BitRate)
%调用simsizes创建sizes结构
sizes=simsizes;
%填写sizes结构
sizes.NumContStates=0;
sizes.NumDiscStates=0;
sizes.NumOutputs=2*BitRate;
sizes.NumInputs=3*L*BitRate;
sizes.DirFeedthrough=1;
sizes.NumSampleTimes=1;
sys=simsizes(sizes);
x0=[];%没有连续状态
str=[];%没有状态次序
ts=[0 0];%继承性的采样周期

%%%%%模块输出%%%%%%%%%%
function sys=mdlOutputs(t,x,u,L,BitRate,M,mapping)

%形成信道
delta=u(1:L*BitRate);%[(L*BitRate)*1]

%还原输出矩阵信号
r1=u(L*BitRate+1:2*L*BitRate)+j*u(2*L*BitRate+1:3*L*BitRate);%[(L*BitRate)*1]

%%%%%SNR rule%%%%%%%
%%%形成矩阵%%%
delta_matr1=reshape(delta,BitRate,L)';%(L*BitRate)
r1_matr2=reshape(r1,BitRate,L).';%(L*BitRate)

%根据SNR准则，选择delta最大的分支
[maxn num1]=max(delta_matr1);
r1_select=r1_matr2(num1+L*(0:BitRate-1));%对应分支输出(1*BitRate)
delta_select=delta_matr1(num1+L*(0:BitRate-1));%(1*BitRate)

%%%判决
for i=1:M
    metrics(i,:)=(abs(r1_select-delta_select*mapping(i))).^2;%distance(1*BitRate)
end
[min_metrics num2]=min(metrics);%select the smallest

decei_symbol=mapping(num2);%(BitRate*1)
real_decei_symbol=real(decei_symbol);%实部
imag_decei_symbol=imag(decei_symbol);%虚部

sys=[real_decei_symbol;imag_decei_symbol];%((2*BitRate)*1)