Subcarrier spacing and symbol time

Subcarrier spacing is equal to the reciprocal of the symbol time. As a result of the longer symbol time, the subcarrier size and spacing decreases from 312.5 KHz to 78.125 KHz. The narrow subcarrier spacing allows better equalization and therefore enhanced channel robustness.

1. What is the relationship between the subcarrier spacing F and symbol time t?
2. Why subcarrier spacing is 15 kHz in LTE?
3. What is the subcarrier spacing?
4. How is OFDM symbol time calculated?

What is the relationship between the subcarrier spacing F and symbol time t?

Explanation: In OFDMA, the relationship between the subcarrier spacing f and symbol time t is f=1/t. They are inversely proportional.

Why subcarrier spacing is 15 kHz in LTE?

Simply, It is because 3G and LTE have the same clock timing for multi technology handsets.

What is the subcarrier spacing?

The subcarriers can be spaced from 15 kHz to 240 kHz apart. In general, due to the characteristics of the channel bands, 15 kHZ to 60 kHz is used in carrier channels below 6 GHz, and 60 kHz to 120 kHz is used for higher frequency channels.

How is OFDM symbol time calculated?

WiMAX MAC Frame To calculate total number of OFDM symbols transmitted per frame, first we have to calculate OFDM symbol duration which is given as: TD OFDM = useful symbol time + guard time TD OFDM = useful symbol time + G * useful symbol time TD OFDM = [1 / (f s / N FTT )] * (1 + G)-(1) Where N FTT is total number of ...