plotting exp given function with db units

Hi , I rarely use matlab and Im trying to plot this function

y = 0.3exp(-0.08SINR[dB])

I'm trying to get the plot of that function and I coudn't succeed in matlab .. any help?

this function plot should look like this as the book :

THE BLUE LINE is that function y I assigned above and Im trying to plot it in matlab with those given SINR values in the photo.

Appreciate for any help please!!

Answer 1

[Mathieu NOE]

here you are , my friend !

SINR_dB = (-5:20);
y = 0.3*exp(-0.08*SINR_dB);
plot(SINR_dB,y,'b','LineWidth',4);
ylim([0 0.8]);
xlabel('SINR[dB]');
ylabel('BLER');

seems the exponentail law will not be valid for SINR > 15 (that sudden drop).

also at SINR = -5 the BLER is supposed to be 0.5 whereas our plot show something around 0.45

are your coefficients somehow rounded or ?

[Jimmy cho]

@Mathieu NOE Yes its rounded like to upper upper bound values ..

after SINR 15 what's shown for you? .. could u please post here the corrected plot with upper bound values?

appreciated.

[Jimmy cho]

@Mathieu NOE any help bro?

[Mathieu NOE]

hello Jimmy

not sure to understand , what you mean by lower and upper bound values

this is the plot generated by my code (see above)