Initial Commit.

2025-07-29 21:45:44 +09:00
parent a69350b86e
commit 90231d49ae
38 changed files with 2051 additions and 0 deletions
@@ -0,0 +1,38 @@
+function [total_nf, total_gain, total_temp] = cal_nf(nf_set, gain_set, reftemp)
+
+% Check inputs 
+narginchk(2,3);
+
+% Validate 
+validateattributes(nf_set,{'double'}, {'nonnan','nonempty','real', ...
+    'vector','nonnegative'}, 'noisefigure', 'NF');
+numNF = numel(nf_set); 
+validateattributes(gain_set,{'double'}, {'nonnan','nonempty','real', ...
+    'vector','numel',numNF}, 'noisefigure', 'G'); 
+NFcol = db2pow(nf_set(:)); 
+Gcol = db2pow(gain_set(:)); 
+
+% Check for temperature input 
+if nargin < 3
+    reftemp = 290; % Standard noise temperature (Kelvin)
+else
+    validateattributes(reftemp,{'double'}, {'finite','nonempty','real', ...
+        'nonnegative','scalar'}, 'noisefigure', 'REFTEMP');
+end
+
+% Calculate total gain
+total_gain = sum(gain_set(:),1); % dB
+
+% Calculate cascaded noise figure
+if numel(NFcol) > 1
+    cnfLinear = NFcol(1) + sum((NFcol(2:end) - 1)./cumprod(Gcol(1:end-1),1),1); % Linear
+    total_nf = 10*log10(cnfLinear); % dB
+else
+    cnfLinear = NFcol(1);
+    total_nf = nf(1);
+end
+
+% Calculate cascaded noise temperature 
+total_temp = reftemp*(cnfLinear); % Kelvin
+
+end