Signal processing method, device and system based on single carrier-frequency domain equalization (SC-FDE)

Abstract

The invention discloses a signal processing method based on single carrier-frequency domain equalization (SC-FDE). The signal processing method comprises the following steps: an optical transmitter generates unique word (UW) sequences and synchronous data blocks; the UW sequences form a data frame, and the synchronous data blocks and the data frame form a super-frame; and finally the super-frame is taken as a base-band signal to be sent to an optical receiver. Meanwhile, the invention further discloses a signal processing system based on SC-FDE. By adopting the signal processing method and the signal processing system based on SC-FDE, hardware equipment of the optical transmitter can be simplified, the cost of the optical transmitter can be reduced, the time synchronization accuracy can be improved, and the occupied processing resource can be reduced during the channel estimation process.

Description

technical field [0001] The present invention relates to signal processing technology in the field of optical fiber communication, in particular to a signal processing method, device and system based on Single Carrier-Frequency Domain Equalization (SC-FDE, Single Carrier-Frequency Domain Equalization). Background technique [0002] In the signal transmission process of the optical fiber communication system, due to the dispersion and polarization mode dispersion (PMD, Polarization Mode Dispersion) caused by high-speed transmission, the distortion and distortion of the transmission channel will be caused, and the distortion and distortion of the transmission channel will further cause the code Inter-symbol interference and inter-symbol interference are the main factors affecting the communication quality in optical fiber communication systems. Therefore, SC-FDE technology is used in the optical fiber communication system to solve the problem of intersymbol interference. [00...

AI Technical Summary

Problems solved by technology

[0006] 1. To transmit data frames composed of CAZAC sequences, a high-end digital-to-analog converter (DAC, Digital-to-Analog Converter) is required, and the high-end DAC has a complex structure and high price;

[0007] 2. The Schmidl synchronization calculation method used by the above signal processing method for time synchronization, since the two UWs before and after the demodulated data frame are the same, there will be a problem that the determined synchronization position is not accurate enough, and there is a correlation between the Schmidl synchronization calculation method The peak is not sharp enough;

[0008] 3. The maximum likelihood estimation method used in the channel estimation of the above signal processing method requires a large number of matrix and inverse matrix operations, so the amount of calculation is huge, so it will occupy a large processing resource of the optical receiver

[0009] It can be seen that the currently existing signal processing method for inserting training sequences cannot simplify the hardware equipment of the optical transmitter and reduce the cost of the optical transmitter, and cannot guarantee the accuracy of time synchronization, and the optical receiver is relatively occupied during channel estimation. large processing resources

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