A frequency offset compensation device and compensation method applied to dqpsk system
A technology of frequency offset compensation and compensation method, which is applied to the compensation module and compensation method of the optimized tracking ability, which can solve the problems of poor stability and limited range, and achieve the effects of enhancing stability, reducing parameter requirements, and being easy to implement
Active Publication Date: 2017-11-10
GUANGXUN SCI & TECH WUHAN
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[0004] In the existing literature, a variety of similar frequency offset compensation methods have been introduced. Their disadvantages are: the range of frequency offset that can be compensated is limited, and must not exceed one-eighth of the symbol rate; The size of the offset, adjust the external local oscillator light source, the stability of this method is poor
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[0047] Below in conjunction with accompanying drawing, the present invention is described in further detail;
[0048] figure 1 It is the overall flowchart of the implementation of the frequency offset compensation module method applied to the DQPSK system of the present invention. The frequency offset compensation module includes: a grouping module 100, a data preprocessing module 101, a phase calculation module 102, a frequency offset precompensation module 103, A residual frequency offset calculation module 104 , a residual frequency offset compensation module 105 , a frequency offset precompensation update module 106 , and a precompensated frequency offset phase calculation module 107 .
[0049] Such as figure 1 As shown, it is the overall flow chart of the method of the present invention; the amplitude of the data before the frequency offset compensation has been compensated, mainly because the phase noise affects the data demodulation, such as Figure 4 Shown is the con...
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The present invention relates to a frequency offset compensation module and its compensation method applied to the DQPSK system. In the method of the present invention, phase amplification and normalization calculation are used to calculate the unit frequency offset and phase offset during the pre-compensation process of each group of vector signal data. N phase data are averaged and divided by four to obtain the residual unit frequency offset phase offset value; add the residual frequency offset and pre-compensated frequency offset, and then multiply the respective serial numbers of the N data to obtain the respective frequency offset Offset phase value; the original phase value before pre-compensation is subtracted from the frequency offset phase obtained by calculating the frequency offset phase to complete the frequency offset phase compensation; the compensation process of the device and its method of the present invention does not need to control the laser, enhance It improves the stability of the system, makes the system easier to implement and reduces the cost.
Description
technical field [0001] The present invention proposes a frequency offset compensation device and a compensation method applied to a DQPSK system, and in particular relates to a polarization multiplexing phase shift keying system applied in the field of optical communication, which can compensate a wide range of frequency offsets and has the advantages of The invention relates to a compensation module and a compensation method with strong tracking ability of frequency offset change, and the invention belongs to the technical field of low-speed and high-speed coherent optical communication. Background technique [0002] With the advancement of communication technology, the polarization multiplexed phase-shift keying coherent optical communication system can achieve a communication rate that is multiple times the symbol rate when the symbol rate is constant, and all the processing of optical signals is transferred to It is carried out in the electrical domain, which reduces the...
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IPC IPC(8): H04L27/22
Inventor宋新明曹丽黄丽艳于龙江毅何国良盛元峰徐健
OwnerGUANGXUN SCI & TECH WUHAN