clear all;
clc;
%設置調制信號的抽樣間隔
xSampleTime = 1/100000;
%設置仿真時間長度
xSimulationTime = 10;
%設置隨機數產生器的初始化種子
xInitialSeed = [61 71];
%設置QPSK調制的初始相位
xPhaseOffset = pi/4;

%x表示信噪比的取值范圍
x = 0:1;
%y表示QPSK調制的誤符號率
y = x;

hold off;
for index = 1:4
    %設置QPSK調制信號的抽樣個數
    xSamplesPerSymbol = index;
    %設置繪圖顏色和誤碼率計算模塊的接收矩陣
    %當xSamplePerSymbol不等于1時誤碼率計算模塊有一個符號的接收時延
    switch index
        case 1
            xReceiveDelay = 0;
            color = 'r';
        case 2
            xReceiveDelay = 1;
            color = 'g';
        case 3
            xReceiveDelay = 1;
            color = 'b';
        case 4
            xReceiveDelay = 1;
            color = 'm';
    end
    for i = 1:length(x)
        %信噪比依次取向量x的數值
        xSNR = x(i);
        %執行QPSK仿真模型
        sim('ch1003');
        %從xErrorRate中獲得調制信號的誤碼率
        y(index,i) = xErrorRate(1);
    end
    %繪制信噪比與誤碼率的關系曲線
    semilogy(x,y(index,:),color);
    hold on;
end