Data transmission and receiving methods based on orthogonal frequency division multiplexing technology, and apparatus

A data receiving method based on an orthogonal frequency division multiplexing technology, comprising:

• performing basic digital signal processing on a received signal to obtain a first to-be-processed signal, wherein the first to-be-processed signal comprises multiple encoded subcarriers;
• sequentially adjusting, starting from a center frequency, locations of two encoded subcarriers whose locations are symmetric on a positive frequency side and a negative frequency side to be continuously distributed, to obtain a second to-be-processed signal;
• separately obtaining, according to grouping information of the encoded subcarriers in the second to-be-processed signal, a phase noise corresponding to the grouping information, and separately compensating the phase noise for the encoded subcarriers in a carrier group corresponding to the grouping information, to obtain a third to-be-processed signal;
• and
• performing differential decoding processing on the third to-be-processed signal to obtain a processed signal.

A transmission device, comprising:

• a receiver, configured to receive input data;
• a processor, configured to:
• process the input data to obtain a modulated signal, wherein the modulated signal comprises continuous subcarriers in multiple frequency domains;
• group the continuous subcarriers in the multiple frequency domains according to grouping information, to obtain multiple carrier groups, wherein each carrier group comprises at least one of the subcarriers, the grouping information is related to a correspondence between a non-linear noise and a frequency, and a difference between non-linear noises corresponding to subcarriers in each carrier group is in a threshold range;
• separately perform differential phase encoding on the subcarriers in each carrier group, to obtain encoded subcarriers of the subcarriers;
• adjust, according to a sequence, the encoded subcarriers of the continuous subcarriers to frequency locations that are symmetric on a positive frequency side and a negative frequency side, to obtain a to-be-transmitted signal;
• and perform frequency-to-time conversion processing on the to-be-transmitted signal, to obtain a time-domain signal;
• and
• a transmitter, configured to send the time-domain signal to a receiving device by using a non-linear optical channel.

A receiving device, wherein the receiving device comprises:

• a receiver, configured to receive a signal sent by a transmission device;
• and
• a processor, configured to:
• perform basic digital signal processing on the signal to obtain a first to-be-processed signal, wherein the first to-be-processed signal comprises multiple encoded subcarriers;
• sequentially adjust, starting from the center frequency, locations of two encoded subcarriers whose locations are symmetric on a positive frequency side and a negative frequency side to be continuously distributed, to obtain a second to-be-processed signal;
• separately obtain, according to grouping information of the encoded subcarriers in the second to-be-processed signal, a phase noise corresponding to the grouping information, and separately compensate the phase noise for the encoded subcarriers in a carrier group corresponding to the grouping information, to obtain a third to-be-processed signal;
• and perform differential decoding processing on the third to-be-processed signal to obtain a processed signal.