xSimulationTime=10;     %仿真時(shí)間的長(zhǎng)度
xInitialSeed=[61 71];     %隨機(jī)數(shù)產(chǎn)生器的初始化種子
xPhaseOffset=pi/4;            %初始相位
x=0:10;                %信噪比的取值范圍
y=x;                 %誤符號(hào)率
hold off;
for index=1:4             %抽樣個(gè)數(shù)
    xSamplesPerSymbol=index;          %設(shè)置繪圖顏色和誤碼率計(jì)算模塊的接受時(shí)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)
        xSNR=x(i);           %信噪比依次取向量X的數(shù)值
        sim('QPSKIS95');      %執(zhí)行仿真模型
        y(i)=xErrorRate(1);      %獲得誤碼率
    end
    semilogy(x,y,color);          %繪制信噪比與誤碼率的關(guān)系曲線
    hold on;
end
grid on;
legend('1 Samples per Symbol','2 Samples per Symbol','3 Samples per Symbol','4 Samples per Symbol',0);
xlabel('SNR(dB)');
ylabel('Symbol Error Rate');