Carrier frequency offset correction

1. What causes carrier frequency offset?
2. What is CFO in OFDM?
3. What is carrier frequency offset in OFDM?
4. What is frequency correction?

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.

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 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 frequency correction?

The Frequency Correction Channel is a broadcast channel used by GSM base stations. It provides a unique tone of 67.7 kHz for the Mobile Stations. This tone is used to synchronize the local clock of the mobile receiver with the base station. This is needed to correctly extract the data.