Subcarrier

Setting the duration of subcarriers in OFDM system

Setting the duration of subcarriers in OFDM system
  1. How to choose subcarrier spacing for OFDM?
  2. How is OFDM symbol duration calculated?
  3. How to calculate number of subcarriers in OFDM?
  4. Why subcarrier spacing is 15 KHz in LTE?

How to choose subcarrier spacing for OFDM?

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.

How is OFDM symbol duration calculated?

The duration of your ofdm symbol is Ts=Tt/(N+Ng).

How to calculate number of subcarriers in OFDM?

If you divide the channel bandwidth (20 MHz) by the subcarrier bandwidth (312.5 kHz) you will see that 802.11a/g comprises 64 subcarriers.

Why subcarrier spacing is 15 KHz in LTE?

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

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