BER OFDM - Basic questions

[Girly_girl]

Hello guys,
hope you are well.
I have had a look at a website and found a code for BER OFDM, the code is more or less well explained.
but i have few questions and would appriciate your kindness in replying:

1. The BER graph... what exactly defines the shape of the graph, i.e. how come some of them are more steeper and some are not as steep..?

2. What are the probability of bit error in relation to OFDM?..
i.e. Could u explain mathematically or in simple terms wats happening?

3. How does the coherent detection and non-coherent detection affect the BER graphs?

I read somewhere that i.e. for Pb,BPSK = 1/2erfc *Square root of (Eb/N0)
Why do we have square root?

Many thanks

Regards

 

[Girly_girl]

Anyone wana suggest anything?

 

[hoz]

BPSK BER with OFDM modulation
Orthogonal Frequency Division Multiplexing (OFDM) Tutorial
**broken link removed**

check these, especially the first one will help a lot.

 

[Tom Duke]

A very good, introductory and advanced too, book is this : Amazon.com: OFDM for Wireless Multimedia Communications (Artech House Universal Personal Communications) (9780890065303): Richard Van Nee: Books
Read it carefully and many of your questions will be answered.

 

[Girly_girl]

Many thanks guys