about LTE physical layer

[mai fouad]

in LTE physical layer implementation using matlab , the turbo decoder when operates only with AWGN it performance is ordinary but when i add the blocks of layer mapping and ofdm it has no effect on them that the BER is still equal BER without using turbo so i didn't know what is the problem !!! that performance with turbo should be better than without it

 

[gowtham_n]

What is your redundancy version for Turbo decoder? It is also a factor for performance when your RV is 2 or 3 then systematic bit correction would be least.