Ofdm

OFDM synchronisation Schmidl and Cox method - question

OFDM synchronisation Schmidl and Cox method - question
  1. How to calculate number of subcarriers in OFDM?
  2. What is the main objective of time synchronization for OFDM?
  3. What is meant by synchronization and why is it very important for OFDM?
  4. How do you calculate OFDM symbol duration?

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.

What is the main objective of time synchronization for OFDM?

Therefore, the purpose of a timing recovery scheme in OFDM is to ensure that the FFT window starts from within the region of correct samples.

What is meant by synchronization and why is it very important for OFDM?

Synchronization of an OFDM signal is required to find the symbol timing and carrier frequency offset (CFO). Before demodulation of subcarriers, either from explicit training data or using cyclic prefix of the OFDM signal we can get synchronization at receiver.

How do you calculate OFDM symbol duration?

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

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