Carrier frequency offset might influence the baseband receiver design. When the oscillator signal for down-conversion in the receiver does not synchronize with the carrier signal contained in the received signal, Carrier frequency offset frequently happens. This process can be credited to two significant methods: first is that mismatch frequency in the transmitter and the receiver oscillators; second is the Doppler impact as the transmitter or receiver moves. At the point when this happens, the received signal will be moved in frequency. Carrier frequency offset consistently exists regardless of whether there is no Doppler impact.