hop11.m

ffh in AWGN and Multitone

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%比特率Tb=1/500,跳频时隙Th=1/1000,L=2.每比特跳2跳。
%跳频频点数目为32
%每跳带宽2*B=2/Th=2000Hz;
%总带宽为：32*2KHz
%多音干扰数定为Q=16;分别加到频点为:
%10005000+4*10000, 10005000+8*10000, 10005000+12*10000,……10005000+64*10000
%信道为加性高斯白噪声信道，Eb/No=13.35dB.
%2FSK调制时0对应的频率是5000Hz,1对应的频率是10000Hz;
%解跳后的复信号为[cos(2*pi*5000*t)+cos(2*pi*10000*t)]+i*[sin(2*pi*5000*t)+sin(2*pi*10
%000*t)],此信号采用2FSK解调模块进行解调，由于2FSK解调时候是将负频率映射到0，正频率映射到1，而此时没有用到负频率，所以设置M-rry
%number为4，即将5000的频率映射到2，10000的频率映射到3，（另外的-10000映射到0，-5000映射到1，此时不考虑），最后将解调后
%的信号减去2，再与原信号（经过一定的延时）比对，即可得出误码率。
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L=2;
Tb=1/500;
Th=Tb/L;
Eb=1;
Ny=1/5000;%多音干扰功率谱密度
Ay=sqrt(2*Ny/Tb);%多音干扰的幅度
sim('hop1');