Assume we have transmission bandwidth of 10 MHz, in this case the total number of subcarriers (FFT size) present is 1024. According to LTE standards, 600 out of 1024 subcarriers are data subcarriers.
data subcarriers= total number of subcarriers- pilot/null subcarriers
Moreover, 0.07 % of 1024 are used as Cyclic Prefix extension
1) Is it correct that we have 1024-600 are therefore unused subcarriers?
(where 600 = total number of Resource Blocks (RB) * number of subcarriers/RB = 50*12)
2) An OFDM symbol is made up of data part and CP part. Is it correct to say that the number of QAM symbols for each OFDM symbol is then 600 (equal to number of data subcarriers) and the number of CP symbols are 72? How is the actual transmission over the subcarriers taking place. For example in downlink, does the transmitter allocate a certain number of subcarriers over which it transmits?
I hope I can get some feedback! Thanks