Araxnid
Newbie level 6
I'm working under OFDM system model and encounterd some problems with understaning how IFFT block working in transmitter.
So, right now i'm sending N bits (lets assume, 128) to QPSK block.
After it i have 32 real and 32 complex coefficients.
Next im need to implement serial to parallel conversion and IFFT operation.
I can't understand what i'm need to do with my 64 coefficients before IFFT? How i should split them?
For example if i will split them in 16 coefficients (64/4 = 16, so 4 threads) this will mean i have 4 subcarriers? Or no?
And after it i need to sum them all in one thread? And then peform multiplication with radiofrequency carrier?
And if yes, then it means that IFFT samples are correleated with number of subcarrires?
Or its okay if i just put 64 coeff in IFFT block without any parallel to serial conversion?
So, right now i'm sending N bits (lets assume, 128) to QPSK block.
After it i have 32 real and 32 complex coefficients.
Next im need to implement serial to parallel conversion and IFFT operation.
I can't understand what i'm need to do with my 64 coefficients before IFFT? How i should split them?
For example if i will split them in 16 coefficients (64/4 = 16, so 4 threads) this will mean i have 4 subcarriers? Or no?
And after it i need to sum them all in one thread? And then peform multiplication with radiofrequency carrier?
And if yes, then it means that IFFT samples are correleated with number of subcarrires?
Or its okay if i just put 64 coeff in IFFT block without any parallel to serial conversion?