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[STDS-802-16] two simple questions.

Hi,
     I am reading the WiMax standard 802.16-2004 together with 802.16-2005. Here are two simples questions.
In section 8.4.2.4 of 802.16-2004, the sampling frequency Fs is defined as Fs = floor(n * BW / 8000) * 8000. The parameter "n' is defined as sampling factor. So, what is the purpose to use this sampling factor ? and what do we choose the constant 8000 in the previous definition ?
Maybe these are so simple for you. Please give me some hints. Thanks.

   yours,
   Zhongshan