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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However, the disadvantage of this cascading approach is

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

[0037] Such as figure 1 As shown, the phase recovery method for 16QAM of the present invention is suitable for a coherent communication system of 16QAM modulation format, and includes the following steps:

[0038] S1. Block the received 16QAM complex signal, that is, split the entire string of data received, and form a data block for every N data length. Such as Figure 4 As shown, the block length of the best data block is 22 at the cost of 1dB SNR. According to the different amplitude of the complex signal, the complex signal is divided into circles, such as figure 2 As shown, the complex signal of each circle is divided into one type, which is divided into three types of data C1, C2, and C3.

[0039] S2. Use 4th order absolute value operation on the three types of data to remove the modulated phase information to obtain with

[0040] Specifically, the fou...

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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...

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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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