src/lte/test/reference/lte_link_budget_interference.m
clear all;
close all;

%% LTE from theory to practice
%% Table 22.7 Reference sensitivity.

fdl = 2120e6;  % DL carrier freq Hz, EARFCN = 100
ful = 1930e6;  % UL carrier freq Hz, EARFCN = 18100 
nrbs = 25; % tx bandwdith configuration in number of RBs
bw = nrbs * 180000; % bandwidth in Hz, note that this is smaller than
		    % the nominal Channel Bandwdith, see TS 36.101 fig 5.6-1
kT = -174; % noise PSD in dBm / Hz
ndBm = kT + 10*log10(bw);  % noise power dBm

dlpdBm = 30;  % tx power dBm in DL
dlp = 10.^((dlpdBm - 30)/10); %% tx pow in W in DL
dlnf = 9; % receiver noise figure in dB in DL
dln = 10.^((ndBm-30+dlnf)/10); %% noise in W in DL

ulpdBm = 10;  % tx power dBm in UL
ulp = 10.^((ulpdBm - 30)/10); %% tx pow in W in UL
ulnf = 5; % receiver noise figure in dB in UL
uln = 10.^((ndBm-30+ulnf)/10); %% noise in W in UL

ber = 0.00005;
gamma = -log (5*ber)./1.5;



%% distances
%%         d2  
%%  UE1-----------eNB2
%%   |             |
%% d1|             |d1
%%   |     d2      |
%%  eNB1----------UE2
%%

d1 = 50;
%% for d2 = [10 100 1000 10000 100000 1000000]
for d2 = [20 50 200 500]

  %% propagation gains (linear)
  %%             g21dl  
  %%      UE1<----------eNB2
  %%      ^ |              
  %%g11dl1| |g11ul          
  %%      | v            
  %%      eNB1<---------UE2
  %%             g21ul

  g11dl = gain_freespace (d1, fdl);
  g11ul = gain_freespace (d1, ful);
  g21dl = gain_freespace (d2, fdl);
  g21ul = gain_freespace (d2, ful);

  %% SINR (linear)
  dlsinr = dlp*g11dl / (dlp*g21dl + dln);
  ulsinr = ulp*g11ul / (ulp*g21ul + uln);

  %% SINR (dB)
  dlsinrdB = 10.*log10(dlsinr);
  ulsinrdB = 10.*log10(ulsinr);

  %% Spectal Efficiency
  dlse = log2(1 + dlsinr./gamma);
  ulse = log2(1 + ulsinr./gamma);

  %% to get the MCS, you need to do a manual lookup into 3GPP R1-081483
  %% starting from the spectral efficiency value.
  %% See the Testing section in the LTE module documentation for more info
  %% on how this is done. You might as well look into lte_amc.m


  printf("AddTestCase (new LteInterferenceTestCase (\"d1=%d, d2=%d\", % f, %f, % f, %f, % f, %f, , ));\n", \
	 d1, d2, d1, d2, dlsinr, ulsinr, dlse, ulse)
  

endfor
