What's the baseband FFT size of LTE?

LTE defines transmission bandwidths from 1.25 MHz up to 20 MHz. In the case of 1.25 MHz transmission bandwidth, the FFT size is 128.

1. What is the size of FFT?
2. What is FFT size in OFDM?
3. What is the sample rate in LTE?
4. What is the relation between FFT size and number of sub carriers?

What is the size of FFT?

DSP literature refers to the algorithms for faster DFT calculation as fast Fourier transforms (FFTs). Common input sequence sizes that are a power of two include 512, 1,024, and 2,048.

What is FFT size in OFDM?

For this version the FFT size is fixed at 256, which 192 subcarriers used for carrying data, 8 used as pilot subcarriers for channel estimation and synchronization purposes, and the rest used as guard band subcarriers.

What is the sample rate in LTE?

Introduction. The LTE HDL Cell Search, LTE HDL MIB Recovery, and LTE HDL SIB1 Recovery reference applications require an input sampling rate of 30.72 Msps.

What is the relation between FFT size and number of sub carriers?

The number of subcarriers = the size of the FFT.