Subcarriers

Subcarrier spacing in OFDM

Subcarrier spacing in OFDM

OFDM and subcarriers allow Wi-Fi to be more fault tolerant and carry data more reliably. Older Wi-Fi standards, such as 802.11ab/g/n/ac, use 64 subcarriers. Each Wi-Fi channel is 20 MHz. Therefore, each subcarrier is spaced 312.5 kHz apart.

  1. How many subcarriers are in OFDM?
  2. Why subcarrier spacing is 15 kHz in LTE?
  3. How to calculate number of subcarriers in OFDM?
  4. What is the space between a subcarrier and the next sub carrier in an LTE network?

How many subcarriers are in OFDM?

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

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 space between a subcarrier and the next sub carrier in an LTE network?

The LTE OFDM subcarrier spacing equals 15 kHz for both downlink and uplink.

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