Ofdm

Ofdm bandwidth calculation

Ofdm bandwidth calculation

Thus the bandwidth of the OFDM baseband signal is N/2*delta_f,delta_f is the sub-carrier frequency spacing. The sub-carrier frequency spacing delta_f =1/Ts= 1/(Td * N), Ts is the OFDM symbol duration,Td is the sampling symbol duration and equal to the smapling time interval。 Thus Td=1/fs, fs is the DAC sampling rate.

  1. What is the bandwidth size of OFDM?
  2. What is the bandwidth of OFDM subcarrier?
  3. How to calculate number of subcarriers in OFDM?
  4. How do you calculate OFDM symbol duration?

What is the bandwidth size of OFDM?

Each OFDM channel consists of 128 to 2048 sub-carriers and can occupy bandwidths from 1.25 MHz to 20 MHz.

What is the bandwidth of OFDM subcarrier?

Each OFDM subcarrier is 312.5 KHz. 802.11ax introduces a longer OFDM symbol time of 12.8 μs, which is four times longer than the legacy symbol time of 3.2 μs. Subcarrier spacing is equal to the reciprocal of the symbol time.

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.

How do you calculate OFDM symbol duration?

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

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