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Phase recovery method and system for 16QAM

A technology of phase recovery and phase angle, which is applied in the field of communication, can solve problems such as increasing implementation complexity, and achieve the effect of reducing implementation complexity, low complexity, and reduced complexity

Active Publication Date: 2018-03-20
WUHAN POST & TELECOMM RES INST CO LTD
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  • Claims
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Problems solved by technology

However, the disadvantage of this cascading approach is that it greatly increases the implementation complexity

Method used

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  • Phase recovery method and system for 16QAM
  • Phase recovery method and system for 16QAM
  • Phase recovery method and system for 16QAM

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0037] Such as figure 1 As shown, the present invention is used for the phase recovery method of 16QAM, is applicable to the coherent communication system of 16QAM modulation format, comprises the following steps:

[0038] S1. Divide the received 16QAM complex signal into blocks, that is, divide the entire series of received data, and form a data block with every N data lengths. Such as Figure 4 As shown, under the SNR penalty of 1dB, the block length of the optimal data block is 22. Then divide the complex signal into circles according to the different amplitudes of the complex signal, such as figure 2 As shown, the complex signals of each revolution are divided into one category, and are divided into three categories of data C1, C2 and C3.

[0039] S2. Using a fourth-order absolute value operation on the three types of data to remove t...

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Abstract

The invention relates to a phase recovery method and system for 16QAM, relating to the technical field of communication. The method comprises the steps of performing phase estimation by using a firstclass and a third class of data points, so as to obtain a coarse phase estimated value; performing phase recovery on the second class of data point alone; performing phase recovery on the second classof data point with phase recovered, so as to obtain an accurate phase estimated value; and finally, adding up the coarse phase estimated value and the accurate phase estimated value to be used as a final phase estimated value, performing phase compensation on all data, so as to obtain a phase recovery signal. The method improves the phase estimation accuracy and lowers the implementation complexity effectively.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a phase recovery method and system for 16QAM. Background technique [0002] In a coherent optical communication system, DSP (Digital Signal Processing, digital signal processing) technology is one of the key technologies for compensating various impairments in the coherent optical communication system. In order to eliminate the phase noise caused by the line width of the laser, in DSP technology, the phase recovery method is mainly used for phase compensation. [0003] The phase recovery methods are mainly divided into two categories, one is the phase recovery method based on the V&V algorithm, and the other is the phase recovery method based on the fast Fourier transform. The former is the most commonly used because of its simple structure and low complexity. The phase recovery method based on the V&V algorithm is mainly used for the phase recovery of the M-PSK (M-aryPha...

Claims

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Application Information

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IPC IPC(8): H04B10/61
CPCH04B10/6165
Inventor 李蔚韩纪龙余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD
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