DB and 400G and minor changes

Classes/01_transmit/ChannelFreqResp.m

@@ -184,12 +184,12 @@ classdef ChannelFreqResp < handle
 
             % it could be helpful to clip at linear 1 (=to keep comp from attenuating the signal)
             % iH(abs(iH)<1) = 1.*exp(1j*angle(iH(abs(iH)<1)));
-            
+
             if 0
                 figure(7);hold on;plot(fnew,20*log10(abs(iH)))
             end
 
-            % iH(1) is DC ---> iH(end) is High Freq. 
+            % iH(1) is DC ---> iH(end) is High Freq.
             H_inv = [iH(1) iH fliplr(conj(iH)) conj(iH(1))];
 
             H_inv = [iH(1) iH iH(end) fliplr(conj(iH)) conj(iH(1))];

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);