The sampling factor n determines the subcarrier spacing (in conjunction with the bandwidth and
used data subcarriers), and the useful symbol time. This value is set to 28/25 for channel
bandwidths that are a multiple of any of 1.25, 1.5, 2 or 2.75 MHz (which is applicable in our
case).
求高人解答啊！
时间: 2012-4-11 23:10
作者: ziyubiti
采样因子，与带宽相关？
例如，5M带宽 512点FFT，20MHz带宽2048点FFT？
时间: 2012-4-12 15:06
作者: kin5000
In OFDM systems, RF BW usually is smaller than FFT BW (Nfft *
subcarrier spacing). E.g., 802.11a, RF BW=17.6MHz (-3dBc) while FFT BW
is 20 MHz.
My understanding is the sampling factor in WiMax FFT BW to RF BW ratio.
In the case of 802.11a, the sampling factor is 20/17.6 = 1.136. I hope
my understanding is correct.