BER and BLER initial measurement

• VSG can generate arbitrary signal. It's not limited by mac format. VSG can allocate a pdu full of data. And we use a fixed pattern to fill the pdu.

• The maximum size of a pdu is 2K (11 bit). The whole downlink zone can be fully utilized.
• We require BER resolution to 10^(-9). It corresponds to 30 bits in denominator counter. If we assume BLER as the calculation unit, the BLER resolution has to be 24 bits.
• The input pattern can be fill 0 and 1.