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[求助]WiMAX中的simpling factor有啥用啊 (进入论坛模式)
提问者：xzb20062007
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提问时间：2012-4-11 15:04
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！
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！
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最佳答案
最佳答案kin5000 的答案
( 采纳时间：2012-4-18 16:03 )
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.
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.
回应该答案 (1) |
回答时间：2012-4-12 15:06
该答案得到 1 个回应 我要回应
60.247.46.* | 2012-4-18 15:58
嗯，好像是这个样子，不过有什么物理意义吗？
其他答案 ( 1 条 )
采样因子，与带宽相关？
例如，5M带宽 512点FFT，20MHz带宽2048点FFT？
例如，5M带宽 512点FFT，20MHz带宽2048点FFT？
该答案得到 1 个回应 我要回应
xzb20062007 | 2012-4-18 16:04
也不是，你看凡是1.25整数倍的都是28/25，这样的话5MHz和10MHz的一样
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