Does overhead remain if the legacy client deployment remains, and is it 100% added to 802.11n overhead?

Yes, the overhead of dealing with legacy clients is added to the 802.11n overhead. By definition legacy clients do not know anything about new 802.11n deployments and hence will not be able to take any action to avoid colliding with 802.11n stations. Therefore, all coexistence overhead - e.g. , the higher-overhead mixed-mode preamble - must be borne by the 802.11n stations.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.