r**********r
发帖数: 13 | 1 LTE中每个symbol前有一个Cyclic Prefix (CP, 4.7 us). CP is just a repeat of
the end of the previous symbol, and is used to give a "settling time" to
allow for delay spread in propagation channel.
Does this meant that if the multipath delay is longer than 4.7 us, the LTE
system will suffer from significant inter symbol interference?
If no, what am I missing here?
谢谢了. | z*****n
发帖数: 7639 | 2 if the multipath delay is longer than 4.7us,
the rake receiver will simply ignore it.
The assumption is that all the most significant
arrivals are within this time interval.
【在 r**********r 的大作中提到】
: LTE中每个symbol前有一个Cyclic Prefix (CP, 4.7 us). CP is just a repeat of
: the end of the previous symbol, and is used to give a "settling time" to
: allow for delay spread in propagation channel.
: Does this meant that if the multipath delay is longer than 4.7 us, the LTE
: system will suffer from significant inter symbol interference?
: If no, what am I missing here?
: 谢谢了.
| g******s
发帖数: 410 | 3 Now I'm a little confused. Is there a rake receiver in OFDM systems? Can you
please give more details? Thanks!
【在 z*****n 的大作中提到】
: if the multipath delay is longer than 4.7us,
: the rake receiver will simply ignore it.
: The assumption is that all the most significant
: arrivals are within this time interval.
| j***i
发帖数: 1278 | 4 师兄也是搞无线的?
【在 z*****n 的大作中提到】
: if the multipath delay is longer than 4.7us,
: the rake receiver will simply ignore it.
: The assumption is that all the most significant
: arrivals are within this time interval.
| S***i
发帖数: 50 | 5 You are not missing any thing.
If the multipath delay is longer than period of CP, ISI will be introduced.
The length of CP is chosen to balance the performance, minimizing ISI and
efficiency. |
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