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 co

Method used

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

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[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings;

[0048] figure 1 It is the overall flow chart 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, The residual frequency offset calculation module 104, the residual frequency offset compensation module 105, the frequency offset pre-compensation amount update module 106, and the pre-compensated frequency offset phase calculation module 107.

[0049] Such as figure 1 Shown is the overall flow chart of the method of the present invention; the amplitude of the data before frequency offset compensation has been compensated, mainly because phase noise affects data demodulation, such as Figure 4 Shown is the const...

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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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