OFDM sensitivity to sampling time offset (with half of time interval between samples)

1. How many time samples are in the useful part of an OFDM symbol?
2. What is sampling frequency in OFDM?
3. How many samples are there in an OFDM symbol?
4. What is symbol timing estimation?

How many time samples are in the useful part of an OFDM symbol?

In 802.11, each OFDM symbol is 4 μs long. At 20 MSPS sampling rate, this means each OFDM symbol contains 80 samples.

What is sampling frequency in OFDM?

▪ 20MHz Bandwidth with 64 subcarriers. ▪ Subcarrier Spacing = 20e6/64 = 312.5KHz. ▪ Sampling Rate = 20MSamples/sec (to meet Nyquist Rate)

How many samples are there in an OFDM symbol?

An 802.11a OFDM carrier signal (burst type) is the sum of one or more OFDM symbols each comprised of 52 orthogonal subcarriers, with baseband data on each subcarrier being independently modulated using quadrature amplitude modulation (available formats: BPSK, QPSK, 16-QAM, or 64-QAM).

What is symbol timing estimation?

3. Symbol timing estimation. The purpose of symbol synchronization is to determine the correct position of the FFT window, which is the original position of OFDM symbol, and the FFT window can contain the current OFDM symbols of N, so that it can get the correct demodulation.