Cyclic prefix in lte

1. What is cyclic prefix in LTE?
2. What do you mean by cyclic prefix?
3. What is normal cyclic prefix?
4. What are typical values of LTE cyclic prefix?

What is cyclic prefix in LTE?

A cyclic prefix is created to prevent intersymbol interference (ISI) when an OFDM signal is transmitted in a dispersive channel. As shown in Figure 13.5, the cyclic prefix (CP) is essentially an identical copy of the last portion of the OFDM symbol appended before the OFDM symbol.

What do you mean by cyclic prefix?

In telecommunications, the term cyclic prefix refers to the prefixing of a symbol, with a repetition of the end.

What is normal cyclic prefix?

Δf, step between subcarriers; l, number of the symbol in the time slot. The normal cyclic prefix is used in case the delay between the different reflected signals is low, which is the case in cells of small diameter (microcell, pico-cell, femto-cell).

What are typical values of LTE cyclic prefix?

LTE uses two types of CP, normal CP of 4.7 microseconds and Extended CP of 16.7 microseconds.