Signal transmission method, transmitter, and signal transmission system

A transmitter comprising:

• a processor;
• a memory storing program instructions to be executed in the processor, the program instructions comprising instructions that cause the processor to:
• obtain a frequency domain response of a fiber channel between the transmitter and a receiving end,
• determine a power fading point of a fiber channel according to the frequency domain response,
• obtain information about the power fading point of the fiber channel between the transmitter and the receiving end, and
• determine, according to the information about the power fading point, a subcarrier that is used to send a service signal to the receiving end on the fiber channel, wherein a frequency of the determined subcarrier is different from that of the power fading point;
• and
• a sender configured to send a service signal to the receiving end by using the determined subcarrier.

A signal transmission system comprising a transmitter and a receiver, wherein the transmitter comprises:

• a processor a processor;
• a memory storing program instructions to be executed in the processor, the program instructions comprising instructions that cause the processor to:
• obtain a frequency domain response of a fiber channel between the transmitter and a receiving end,
• determine a power fading point of the fiber channel according to the frequency domain response
• obtain information about the power fading point of the fiber channel between the transmitter and the receiving end, and
• determine, according to the information about the power fading point, a subcarrier that is used to send a service signal to the receiving end on the fiber channel, wherein a frequency of the determined subcarrier is different from that of the power fading point;
• and
• a sender configured to send a service signal to the receiving end by using the determined subcarrier.