fashejiboxing.m

单用户超宽带通信系统仿真,基于线性调频信号

function asdas
Pow = -30;       % Average transmitted power (dBm)

fc = 50e9;       % sampling frequency

numbits = 4;     % number of bits generated by the source

Ts =5e-9;       % frame time, i.e. average pulse
                 %  repetition period [s]
Tm = 5e-9;     % pulse duration [s]
B=4e9;
G = 1;
bits =bits(numbits);
power = (10^(Pow/10))/1000;     % average transmitted power
                                %  (watt)
Ex = power * Ts; 
w0=zeros(1,Ts*numbits*fc);
for i=1:numbits
if   bits(i)==0 
    w1=waveformdown(fc,Tm,B)
    w0((Ts*(i-1)*fc+1):fc*Ts*i)=w1(1:fc*Tm);% Energy Normalized pulse
else  
    w2=waveformup(fc,Tm,B);
    w0((Ts*(i-1)*fc+1):fc*Ts*i)=w2(1:fc*Tm);   
end   %  waveform
end
wtx = w0 .* sqrt(Ex);           % pulse waveform
Sa = conv(bits,wtx);        % Output of the filter

% Output generation

L = (floor(Ts*fc))*numbits;
Stx = Sa(1:L);
% ---------------------------
% Step Two - Graphical Output
% ---------------------------

if G
    
F = figure(1);
set(F,'Position',[32 223 951 420]);

tmax = numbits*Ts;
time = linspace(0,tmax,length(Stx));
P = plot(time,Stx);
set(P,'LineWidth',[2]);
ylow=-1.5*abs(min(wtx));
yhigh=1.5*max(wtx);
axis([0 tmax ylow yhigh]);
AX=gca;
set(AX,'FontSize',12);
X=xlabel('Time [s]');
set(X,'FontSize',14);
Y=ylabel('Amplitude [V]');
set(Y,'FontSize',14);
for j = 1 : numbits
    tj = (j-1)*Ts;
    L1=line([tj tj],[ylow yhigh]);
    set(L1,'Color',[0 0 0],'LineStyle', ...
       '--','LineWidth',[2]);
end
end % end of graphical output