# How calculate Energy efficiency in massive MIMO with antenna selection ?

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RT Student on 2 Jun 2021
What is the formula of Energy efficiency (Bits/joule) with this code (using matrix)? Basically, this code selects the optimal sub-matrix from a capacity point of view. I want it to be the same except with energy efficiency thank's.
%%%%%%%%%%%OPTIMAL ANTENNA SELECTION
Ns=4;
Nr=16;
SNR=6;%dB
SNR= 10^(SNR/10);
simulation=10;
capacityOfAver=[];
for Lr=1:8
capacityOfSum=0;
antennaSubset=nchoosek([1:Nr],Lr);
for sim=1:simulation
H=sqrt(1/2)*(randn(Nr,Ns)+1j*randn(Nr,Ns));
capacityOfSubsetMax=0;
for k=1:nchoosek(Nr,Lr);
indexOfChannel=antennaSubset(k,:);
H_sel=H(indexOfChannel,:);
capacityOfSubset=log2(det(eye(Ns)+SNR/Ns*(H_sel'*H_sel))) ;
if(capacityOfSubset>capacityOfSubsetMax)
capacityOfSubsetMax=capacityOfSubset;
end
end
capacityOfSum=capacityOfSum+capacityOfSubsetMax;
capacityOfAver=[capacityOfAver,capacityOfSum/simulation];
end
%plot
X=[0:8];
plot(X,[0,capacityOfAver]);
xlabel('Lr');
ylabel('capacity(bit/s/Hz)');
grid on;
hold on;