fft - Hermitian symmetry in OFDM systems

I am trying to understand the usage of Hermitian symmetry in OFDM systems and have a couple of questions regarding this.

1. What is the reason of using the Hermitian symmetry in OFDM?


2. How can we arrange the data in terms of Hermitian symmetry?


3. In OFDM system where do we arrange our data as Hermitian symmetry?


4. Is there any reference or documentation that explains Hermitian symmetry in OFDM system?