I want to know what is the law that calculates the bit rate. I have found the code below. I hope you can explain to me the mathematical laws that have been converted to code.

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Rita 2023-11-30

% Analog-only beamforming

SINR_BS=(SNR*(abs(Wrf(:,u)'*Channel*Frf(:,u)).^2))/(SNR*sum((abs(Wrf(:,u)'*Channel*Frf(:,Int_set)).^2))+1);

Rate_BS(count)=Rate_BS(count)+log2(1+SINR_BS)/(Num_users*ITER);

end

% Hybrid Precoding

Rate_HP(count)=Rate_HP(count)+log2(det(eye(Num_users)+SNR*(He*(Fbb*Fbb')*He')))/(Num_users*ITER);

% Hybrid Precoding MMSE

Rate_HP_MSE(count)=Rate_HP_MSE(count)+log2(det(eye(Num_users)+SNR*(He*(FbbMSE*FbbMSE')*He')))/(Num_users*ITER);

% Hybrid Precoding Kalman

Rate_HP_Kalman(count)=Rate_HP_Kalman(count)+log2(det(eye(Num_users)+SNR*(He*(Fbbk*Fbbk')*He')))/(Num_users*ITER);

% ZF fully digital precoding

Rate_HP_FD_ZF(count)=Rate_HP_FD_ZF(count)+log2(det(eye(Num_users)+SNR*(He_fd*(Ffd*Ffd')*He_fd')))/(Num_users*ITER);

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