亚星游戏官网-yaxin222

门户 | 手机客户端 | 论坛 | 人才 | 百科 | 搜索 | 技术问答 | English
已解决问题
[求助]LTE的子载波间隔为什么是15kHz?
提问者:hust520   |  提问时间:2011-7-21 21:23
困扰了很久,高手引导一下,多谢!
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.
我再给你说明一下:
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
 
我要回应:  回应字数在5000字以内

 

XML 地图 | Sitemap 地图