DB and 400G and minor changes

Classes/01_transmit/PAMsource.m

@@ -10,6 +10,7 @@ classdef PAMsource
         randkey
 
         db_precode
+        db_encode
 
         mrds_code
         mrds_blocklength
@@ -36,6 +37,7 @@ classdef PAMsource
                 options.randkey = 0;
 
                 options.db_precode = 0;
+                options.db_encode = 0;
 
                 options.mrds_code = 0;
                 options.mrds_blocklength = 512;
@@ -95,10 +97,16 @@ classdef PAMsource
             symbols = PAMmapper(obj.M,0).map(bits);
             symbols.fs = obj.fsym;
 
+            %%%%%% Duobinary %%%%%%%%%%%
             if obj.db_precode
                 symbols = Duobinary().precode(symbols);
+            end
+
+            if obj.db_encode
                 symbols = Duobinary().encode(symbols);
             end
+
+            % figure(12);hold on;histogram(symbols.signal,'Normalization','probability');
             
             if obj.mrds_code
                 symbols = MRDS_coding("blocklength",obj.mrds_blocklength).encode(symbols);