| 摘要 |
The present invention discloses an OFDM system and a center frequency adjustment method thereof. The method includes: acquiring, by a receive end, current signal-to-noise ratio values of subcarriers of an OFDM signal transmitted by a transmit end; calculating, by the receive end, a current signal-to-noise-ratio-related value according to the current signal-to-noise ratio values, where the current signal-to-noise-ratio-related value is an operation result obtained by performing a numerical operation on the current signal-to-noise ratio values, and different current signal-to-noise ratio values correspond to a different current signal-to-noise-ratio-related value; acquiring, by the receive end according to the current signal-to-noise-ratio-related value, a current frequency shift value corresponding to the current signal-to-noise-ratio-related value from a linear relationship between a frequency shift value of a center frequency of the OFDM signal and a signal-to-noise-ratio-related value; determining, by the receive end, a frequency adjustment value according to the current frequency shift value, and transmitting the frequency adjustment value to the transmit end; and adjusting, by the transmit end according to the frequency adjustment value, the center frequency of the OFDM signal transmitted by the transmit end. The present invention can identify a shift of a center frequency, and adjust a frequency of a laser to fix the frequency, thereby ensuring performance stability of the OFDM system. |
