Detection method and device suitable for multicarrier frequency domain modulation signal

Abstract

The invention relates to the field of multicarrier frequency domain modulation in an optical communication system, in particular to a detection method and device suitable for a multicarrier frequency domain modulation signal. The method comprises the steps of receiving the multicarrier frequency domain modulation signal, performing fast Fourier transform (FFT) after sampling, obtaining the phase of each frequency point in a corresponding carrier frequency band according to a primary FFT result, calculating the phase difference of each frequency point based on two adjacent FFT results, and then calculating the average value of multiple continuous FFT phase differences of each frequency point. In the frequency band needing to be analyzed, after phase compensation is conducted on each frequency point through the corresponding average value, accumulation of multiple FFT results is conducted, modulo operation is conducted on the results obtained after accumulation, and the frequency points with the enhanced modulo values are the frequency points with subcarriers. According to the invention, the detection accuracy of the multicarrier frequency domain modulation signal after long-distance optical fiber transmission can be improved.

Description

technical field [0001] The invention relates to the field of multi-carrier frequency domain modulation in optical communication systems, in particular to a detection method and device suitable for multi-carrier frequency domain modulation signals. Background technique [0002] At present, the optical communication network is constantly developing in the direction of higher speed, larger capacity and longer distance. A variety of modulation formats play their own advantages in different scenarios. Among them, multi-carrier frequency-domain modulation signals are receiving more and more attention due to their high spectral efficiency and ability to achieve higher rates and bandwidths. At the same time, with the substantial increase in network capacity and speed, the management and maintenance of different channels is particularly important. [0003] In the optical network system, in order to facilitate management, the optical label based on multi-carrier frequency domain modu...

AI Technical Summary

Problems solved by technology

At the same time, in the existing wavelength division multiplexing network, there will be 80-120 channels of different wavelengths. After the optical label signal is combined at the sending end, the signal-to-noise ratio on the transmission link will drop significantly.

After long-distance optical fiber transmission, errors may occur in the detection of the multi-carrier frequency-domain modulation signal at the receiving end, and there is a possibility that the corresponding frequency point of the multi-carrier frequency-domain modulation signal cannot be detected

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