24/10/2022

## What are the typical values of LTE cyclic prefix?

With all the research work, LTE has come up with two different values for the CP, one is called Normal CP and uses a CP of 4.7 microseconds duration, and the other one is called Extended CP and uses a CP of 16.7 microseconds duration.

What is normal cyclic prefix?

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 is a cyclic prefix in OFDM?

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 is the duration of long cycle prefix in LTE?

Extended CP : with a duration of 16.67 microseconds.

What is the benefit of using cyclic prefix?

Provides robustness: The addition of the cyclic prefix adds robustness to the OFDM signal. The data that is retransmitted can be used if required. Reduces inter-symbol interference: The guard interval introduced by the cyclic prefix enables the effects of inter-symbol interference to be reduced.

What is meant by cyclic prefix?

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

## What is cyclic prefix in 5g?

Cyclic prefix (CP) refers to the prefixing of a symbol, with a repetition of the end In OFDM wireless systems. The receiver is typically configured to discard the cyclic prefix samples A CP can be used to counter the effects of multipath propagation. The basics of CP is available in following post.

How is cyclic prefix calculated?

Therefore, the number of samples allocated for cyclic prefix can be calculated as Ncp=Tcp*N/T, where N is the FFT/IFFT length, T is the IFFT/FFT period and Tcp is the duration of cyclic prefix.

Which of the following is are the disadvantages of a cyclic prefix?

Following are the drawbacks or disadvantages of Cyclic Prefix (CP): ➨It reduces system capacity and consecutively reduces overall data rate of the system due to use of redundant data. ➨Cyclic prefix based OFDM packet need more power to transmit due to increase in overall bandwidth.

### What is cyclic prefix in 5G?

What is LTE scheduling?

What is a LTE Scheduler? Scheduling is a process through which eNodeB decides which UEs should be given resources (RBs), how much resource (RBs) should be given to send or receive data . In LTE, scheduling is done at per subframe basis i.e. every 1 mili second. The entity which is govern this is know as scheduler.