What is the minimum length of cyclic prefix in OFDM systems

Question

I came to know 5G radio is going to use something called Filter OFDM unlike 4G radio which was using cyclic prefix OFDM.

Answer 1

There are mainly two types of cyclic prefix used.
1. Normal cyclic prefix
2. Extended cyclic prefix

For both the types, minimum values are defined as follows:
Normal Cyclic Prefix : There will be total 7 symbols per time slot . First symbol is 5.2 microseconds long while remaining 6 symbols would be 4.69 microseconds long

Extended cyclic prefix : There will be total 6 symbols per time slot and each symbol will be 16.67 microseconds long.

Reference:
https://home.zhaw.ch/kunr/NTM1/literatur/LTE%20in%20a%20Nutshell%20-%20Physical%20Layer.pdf

Comments

Thanks Vimal Kumar Mishra but this is in context of LTE but in general which physical parameter decides this length so that ISI is removal is done?