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LTE: Difference between the cyclic prefix and extended cyclic prefix ?

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LTE: Difference between the cyclic prefix and extended cyclic prefix ?
posted Apr 30, 2014 by Ganesh Kumar

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1 Answer

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Cyclic Prefix: To make possible the use of OFDM in LTE is FFT/IFFT. To reduce the Inter Symbol Interference in channels we add cyclic prefix in signal.

What is cyclic prefix in LTE ? (Difference is in last paragraph)
Just copying the last part of each OFDM symbol with the length of a guard interval forms a cyclic prefix (CP). It consumes both a bandwidth and power penalty.

Cyclic Prefix

In summary, the use of the cyclic prefix entails data rate and power losses. The “wasted” power has increased importance in an interference-limited wireless system, causing interference to neighboring users.

Where L is the power used for non CP transmission. In the case where there is a large delay spread, e.g. due to large cell radius, an extended CP option can be used.

answer May 7, 2014 by anonymous
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