Re: OFDM question
The other way to look at this problem is to consider niquist theorm.
According to the theorm, If bandwidth is W and used channel time is T, you can transmit maximum of 2*W*T independent symbols.
Hnce for single carrier we can tranmite 2WT independent symbols.
In OFDM case, symbol duration is T hence BW per sub channel is 1/T. Total number of subchannels is W/(1/T)=WT, and each carrier can TX 1 complex symbol ( that is 2 real symbols).
Hence total independent symbols during T--> 2*WT
wich is the same as the single carrier case....
The advantage of OFDM is channel estimtimation is very simple. whereas in single carrier case, complexity may be 5-10 fold