Kazkou,

  Assuming that the question is how to determine the value of the loop
bandwidth, equation #11. The values in the equation are the design values
of the blocks in the design. So in theory, you should be able to calculate
the BER from the initial design studies. The values of Kpd and H(f) should
be fixed. The value of Kvco maybe a challenge since control voltage to
frequency transfer function maybe non-linear. However, in most cases
this relationship is controlled by the VCO calibration and should effectively
be a constant also.

                                                                          Sheldon