A should be no less than 12 in PDCCH, since padding is used for shorter lengths. This can be further improved by treating the padded bits as frozen bits.

Author: robmaunder

PDCCH_decoder.m

@@ -43,6 +43,9 @@
 
 addpath 'components'
 
+if A < 12
+    error('polar_3gpp_matlab:UnsupportedBlockLength','A should be no less than 12.');
+end
 if A > 140
     error('polar_3gpp_matlab:UnsupportedBlockLength','A should be no greater than 140.');
 end

PDCCH_encoder.m

@@ -41,6 +41,9 @@
 
 A = length(a);
 
+if A < 12
+    error('polar_3gpp_matlab:UnsupportedBlockLength','A should be no less than 12.');
+end
 if A > 140
     error('polar_3gpp_matlab:UnsupportedBlockLength','A should be no greater than 140.');
 end