Why we use 1536 point FFT for 15 MHz bandwidth, when we can use 1024 point FFT, as in bandwidth of 15 MHz we have only 900 subcarriers.


1 Answer 1


The LTE standard requires different FFT sizes for different bandwidths:


And all the parameters have to fit together, as shown in:


"LTE parameters have been chosen such that FFT lengths and sampling rates are easily obtained for all operation modes while at the same time ensuring the easy implementation of dual-mode devices with a common clock reference."

Note that in the above link, the 15 MHz bandwidth has 901 subcarriers and 635 guard subcarriers.

Also see this post:

what's the baseband FFT size of LTE?


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