HELLO JYOTI RAINA..
Well i think you are interpreting the results for bit error rate in a wrong way.. You know for nay system to be designed or designed already what we desire is lowest possible value for bit error rate (BER) and when the value for BER will be 1 ..it means your system performance is very poor and low value for quality factor.. U must try to get your BER as low as possible i.e close to zero not 1..
I hope u understand .
Thanks & regards