Carrier frequency offset estimation

1. What is carrier frequency offset in OFDM?
2. What is CFO in OFDM?
3. What causes carrier frequency offset?
4. How do you find the carrier frequency?

What is carrier frequency offset in OFDM?

Carrier frequency offset (CFO) is one of most well-known disturbances for OFDM. It generates inter-carrier interference (ICI) and degrades OFDM performance [1]. In order to mitigate the negative influence, CFO is usually estimated and compensated accordingly during OFDM reception.

What is CFO in OFDM?

OFDM is sensitive to the carrier frequency offset (CFO) which may be caused due to difference in the carrier frequencies of transmitter and receiver. A well-known problem of OFDM is its sensitivity to frequency offset which occur due to the mismatch between transmitter and receiver local oscillator.

What causes carrier frequency offset?

Carrier frequency offset often occurs when the local oscillator signal for down-conversion in the receiver does not synchronize with the carrier signal contained in the received signal.

How do you find the carrier frequency?

carrier frequency is 100 Hz. for 1:1, then the corresponding carrier for 3:1 is (3x100/1) = 300 Hz. For any 1:N ratio we can get the answer by taking C x 100. For a NFC:M ratio, we take C x 100 / NFC, e.g. for 7:5 and 2:5, the carrier for 7:5 is 7x100/2 = 350 Hz.