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已解决问题
呵呵，给你从书上摘一段。将的还是很明白的：
There are two factors that constrain the selection of the OFDM subcarrier spacing:
1， The OFDM subcarrier spacing should be as small as possible (Tu as large as possible) to minimize the relative cyclic-prefix overhead Tcp/(Tu + Tcp) – see further Section 3.8.3.
2， A too small subcarrier spacing increases the sensitivity of the OFDM transmission to Doppler spread and different kinds of frequency inaccuracies.
我再给你解释一下：
1，子载波间隔越小，OFDM符号周期Tu越长（Tu = 1/子载波间隔），这样CP开销越小。Tcp为CP长度。
2，子载波间隔小，对频偏较敏感。
[[i] 本帖最后由 jeffyko 于 2011-7-21 22:04 编辑 [/i]]
There are two factors that constrain the selection of the OFDM subcarrier spacing:
1， The OFDM subcarrier spacing should be as small as possible (Tu as large as possible) to minimize the relative cyclic-prefix overhead Tcp/(Tu + Tcp) – see further Section 3.8.3.
2， A too small subcarrier spacing increases the sensitivity of the OFDM transmission to Doppler spread and different kinds of frequency inaccuracies.
我再给你解释一下：
1，子载波间隔越小，OFDM符号周期Tu越长（Tu = 1/子载波间隔），这样CP开销越小。Tcp为CP长度。
2，子载波间隔小，对频偏较敏感。
[[i] 本帖最后由 jeffyko 于 2011-7-21 22:04 编辑 [/i]]
回答时间：2011-7-21 21:54
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