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graph b/w SNR and BER

hello everyone, my thesis topic is ofdm based multiple access techniques. i design an ofdm vi which is good in cascade and i also add a channel which is AWGN and a plot b/w BER and SNR is comes out. my problem is that the graph is not like exponentially decreasing form. in BER the values are nt comes in decreasing way for e.g 1st come out with value 0.501..and then 0.499.. then 0.432.. then 0.5102 and so on. these values are randomly comes out but i want that values comes in decreasing format due to which my graph may b comes out in decreaing format with respect to SNR. people its my basic structure and my thesis is based on it so plz help me wt should i do that my BER values comes out in decreasing format. plz help

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