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TransmissionEffectFun.m
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function [SER,Ttotal] = TransmissionEffectFun(TrData,SNR_dB,MyMethod)
%%%传输效果函数
%输入参数为待传输数据、信噪比和调制方式
%输出参数为误码率和传输总时间
%% 变量与参数定义
DN = length(TrData); %总数据量
ReData = -1*ones(1,DN); %接收数据矩阵
Ps = 1; %平均发射功率
SNR = 10^(SNR_dB/10); % 线性信噪比
sigma2 = Ps/SNR; %噪声方差
T = 0.1*1e-3; %符号间隔0.1ms
Tc = 100*1e-3; %相干时间100ms
symnum = Tc/T; %每段相干时间内的符号数
datanum = (Tc/T)*[1,2,4,6]; %每段相干时间内的数据量（bit）
Tindex = 0; %时间头指针
Dindex = 1; %数据头指针
Ttotal = 0; %传输总时间
%% 调制方式选择
if MyMethod == 1 %固定BPSK调制
while 1
h = 1+sqrt(1e-4)*(randn+1j*randn); %瑞利信道衰减系数
Dindexp = Dindex+datanum(MyMethod)-1; %数据尾指针
if Dindexp >= DN %防止指针溢出
Dindexp = DN;
end
Tindexp = Tindex+Tc*(Dindexp-Dindex)/datanum(MyMethod); %时间尾指针
%调制、通过信道、解调
x = BPSK_modulation(TrData(Dindex:Dindexp)); %发射的信号
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));%生成的噪声
y = (x+w)*h; %接收的信号
ReData(Dindex:Dindexp) = BPSK_demodulation(y); %解调映射到二进制数据
Tindex = Tindexp; %时间指针重置
Dindex = Dindexp+1; %数据指针重置
if Dindex > DN %信号处理结束判断
Ttotal = Tindex;
break;
end
end
s = 0; %误码计数变量
for i = 1:DN
if TrData(i) ~= ReData(i)
s = s+1;
end
end
SER = s/DN;
elseif MyMethod == 2 %固定QPSK调制
while 1
h = 1+sqrt(1e-4)*(randn+1j*randn); %瑞利信道衰减系数
Dindexp = Dindex+datanum(MyMethod)-1; %数据尾指针
if Dindexp >= DN %防止指针溢出
Dindexp = DN;
end
Tindexp = Tindex+Tc*(Dindexp-Dindex)/datanum(MyMethod); %时间尾指针
%调制、通过信道、解调
x = QPSK_modulation(TrData(Dindex:Dindexp));
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));
y = (x+w)*h;
ReData(Dindex:Dindexp) = QPSK_demodulation(y);
Tindex = Tindexp; %时间指针重置
Dindex = Dindexp+1; %数据指针重置
if Dindex > DN %信号处理结束判断
Ttotal = Tindex;
break;
end
end
s = 0; %误码计数变量
for i = 1:DN
if TrData(i) ~= ReData(i)
s = s+1;
end
end
SER = s/DN;
elseif MyMethod == 3 %固定16QAM调制
while 1
h = 1+sqrt(1e-4)*(randn+1j*randn); %瑞利信道衰减系数
Dindexp = Dindex+datanum(MyMethod)-1; %数据尾指针
if Dindexp >= DN %防止指针溢出
Dindexp = DN;
end
Tindexp = Tindex+Tc*(Dindexp-Dindex)/datanum(MyMethod); %时间尾指针
%调制、通过信道、解调
x = QAM16_modulation(TrData(Dindex:Dindexp));
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));
y = (x+w)*h;
ReData(Dindex:Dindexp) = QAM16_demodulation(y);
Tindex = Tindexp; %时间指针重置
Dindex = Dindexp+1; %数据指针重置
if Dindex > DN %信号处理结束判断
Ttotal = Tindex;
break;
end
end
s = 0; %误码计数变量
for i = 1:DN
if TrData(i) ~= ReData(i)
s = s+1;
end
end
SER = s/DN;
elseif MyMethod == 4 %固定64QAM调制
while 1
h = 1+sqrt(1e-4)*(randn+1j*randn); %瑞利信道衰减系数
Dindexp = Dindex+datanum(MyMethod)-1; %数据尾指针
if Dindexp >= DN %防止指针溢出
Dindexp = DN;
end
Tindexp = Tindex+Tc*(Dindexp-Dindex)/datanum(MyMethod); %时间尾指针
%调制、通过信道、解调
%防止二进制数码个数不能被6整除
x = QAM64_modulation([TrData(Dindex:Dindexp),zeros(1,6-mod(Dindexp-Dindex+1,6))]);
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));
y = (x+w)*h;
tem = QAM64_demodulation(y);
ReData(Dindex:Dindexp) = tem(1:Dindexp-Dindex+1);
Tindex = Tindexp; %时间指针重置
Dindex = Dindexp+1; %数据指针重置
if Dindex > DN %信号处理结束判断
Ttotal = Tindex;
break;
end
end
s = 0; %误码计数变量
for i = 1:DN
if TrData(i) ~= ReData(i)
s = s+1;
end
end
SER = s/DN;
elseif MyMethod == 5 %自适应调制
method = JudgeModulationMethod(SNR_dB); %自适应判断调制方式
while 1
h = 1+sqrt(1e-4)*(randn+1j*randn); %瑞利信道衰减系数
Dindexp = Dindex+datanum(method)-1; %数据尾指针
if Dindexp >= DN %防止指针溢出
Dindexp = DN;
end
Tindexp = Tindex+Tc*(Dindexp-Dindex)/datanum(method); %时间尾指针
%调制、通过信道、解调
if method == 1
x = BPSK_modulation(TrData(Dindex:Dindexp)); %发射的信号
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));%生成的噪声
y = (x+w)*h; %接收的信号
ReData(Dindex:Dindexp) = BPSK_demodulation(y); %解调映射到二进制数据
elseif method == 2
x = QPSK_modulation(TrData(Dindex:Dindexp));
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));
y = (x+w)*h;
ReData(Dindex:Dindexp) = QPSK_demodulation(y);
elseif method == 3
x = QAM16_modulation(TrData(Dindex:Dindexp));
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));
y = (x+w)*h;
ReData(Dindex:Dindexp) = QAM16_demodulation(y);
else
%防止二进制数码个数不能被6整除
x = QAM64_modulation([TrData(Dindex:Dindexp),zeros(1,6-mod(Dindexp-Dindex+1,6))]);
w = sqrt(sigma2/2)*(randn(length(x),1)+1j*randn(length(x),1));
y = (x+w)*h;
tem = QAM64_demodulation(y);
ReData(Dindex:Dindexp) = tem(1:Dindexp-Dindex+1);
end
Tindex = Tindexp; %时间指针重置
Dindex = Dindexp+1; %数据指针重置
if Dindex > DN %信号处理结束判断
Ttotal = Tindex;
break;
end
end
s = 0; %误码计数变量
for i = 1:DN
if TrData(i) ~= ReData(i)
s = s+1;
end
end
SER = s/DN;
else
error('调制方式未在允许范围内！');
end
end