I want to calculate SIR for a Tran in the center of a circle for each interferer distributed randomly in the circle

I'm defining SIR_V2V_S as an open 1xn matrix but not getting SIR_V2V_S for each interferer rather getting value of SIR for last interferer only.

SIR_V2V_S=[]

m=0;

for n=1:length(I_dis_v2v)

m=I_dis_v2v(n);

SIR_V2V_S= (P_V.*(r_v.^(-Eta_V)).*Ch_Fading)./((sum((P_V.*hx.*(m.^(-Eta_V)))))+N0);

end

Answer 1

[Vedant Shah]

Hi @Adeel Ahmad,

The Signal-to-Interference Ratio (SIR) needs to be computed for a transmitter (Tx) located at the centre of a circle, with multiple interferers randomly distributed within the circle.

In the provided code, a loop is used to iterate over each interferer, but the variable ‘SIR_V2V_S’ is overwritten in each iteration instead of storing the result for each interferer.

To fix this, the SIR value for each interferer needs to be appended to the ‘SIR_V2V_S’ array. So, the following line of code

SIR_V2V_S= (P_V.*(r_v.^(-Eta_V)).*Ch_Fading)./((sum((P_V.*hx.*(m.^(-Eta_V)))))+N0); 

Should be replaced by:

SIR_V2V_S (end+1) =  (P_V.*(r_v.^(-Eta_V)).*Ch_Fading)./((sum((P_V.*hx.*(m.^(-Eta_V)))))+N0); 

For more information, please refer to the documentation using the following commands in the MATLAB command line: 

web(fullfile(docroot, " /matlab/ref/end.html"));