Subcarriers

Number of subcarrier and transmit power

Number of subcarrier and transmit power
  1. What is the number of subcarriers?
  2. How do you calculate the number of subcarriers?
  3. Why only 12 subcarriers in LTE?
  4. How many subcarriers are in OFDM?

What is the number of subcarriers?

There are K = 64 subcarriers, and the subcarrier spacing is 312.5 kHz. Among the 64 subcarriers, there are 48 active subcarriers modulated by QPSK or 64-QAM constellations.

How do you calculate the number of subcarriers?

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. This is referred to as 64-point FFT/IFFT.

Why only 12 subcarriers in LTE?

In the downlink, the subcarriers are split into resource blocks. This enables the system to be able to compartmentalise the data across standard numbers of subcarriers. Resource blocks comprise 12 subcarriers, regardless of the overall LTE signal bandwidth. They also cover one slot in the time frame.

How many subcarriers are in OFDM?

A single OFDM symbol contains 52 subcarriers; 48 are data subcarriers and 4 are pilot subcarriers.

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