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Frequency-offset compensation module and method applied to DQPSK (differential quadrature reference phase shift keying) system

A frequency offset compensation and frequency offset technology, which is applied to the frequency offset compensation module applied to the DQPSK system and its compensation field, and can solve the problems of limited range and poor stability.

Active Publication Date: 2014-12-24
GUANGXUN SCI & TECH WUHAN
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Problems solved by technology

[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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  • Frequency-offset compensation module and method applied to DQPSK (differential quadrature reference phase shift keying) system
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  • Frequency-offset compensation module and method applied to DQPSK (differential quadrature reference phase shift keying) system

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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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Abstract

The invention relates to a frequency-offset compensation module and method applied to a DQPSK (differential quadrature reference phase shift keying) system. According to the method, each set of vector signal data is calculated by phase amplification and normalization during compensation so as to obtain unit frequency-offset phase shift; N pieces of phase data are averaged and divided by four so as to obtain residual unit frequency-offset phase shift; residual frequency offset and pre-compensation frequency offset are added together and multiplied by respective numbers of the N pieces of data, and respective frequency-offset phase values are obtained; an original phase value obtained before pre-compensation is subtracted by frequency-offset phase obtained after phase-offset phase calculation, and frequency-offset phase compensation is achieved. The frequency-offset compensation module and method has the advantages that the compensation process needs control of a laser, system stability is enhanced, the system is easier to implement, and cost is lowered.

Description

technical field [0001] The present invention proposes a frequency offset compensation module and its compensation method applied to the DQPSK system, especially relates to a polarization multiplexed 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 req...

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Application Information

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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
Owner GUANGXUN SCI & TECH WUHAN
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