# 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?

Given an OFDM system with $N$ subcarriers the following conditions must hold $$c_{-k} = c^*_k\\ c_0\in \mathbb{R}$$ where $c_k$ is the complex value of subcarrier with index $k\in[-N/2\ldots N/2-1]$. This can be achieved by mapping $N/2$ complex symbols to subcarriers $0$ to $N/2-1$ and then assigning the respective complex conjugate value to the according subcarrier with negative index. This would normally take place after the mapper and before the inverse DFT (IDFT) block.