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Nonlinear damage compensation method based on VOLTERRA model in OFDM-PON (orthogonal frequency division multiplexing-passive optical network) system

An OFDM-PON, nonlinear damage technology, applied in the field of nonlinear damage compensation based on the VOLTERRA model in the OFDM-PON system, can solve the problems of high complexity of the compensation method and the inability to effectively deal with the OFDM-PON system.

Inactive Publication Date: 2014-11-19
SHANGHAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art, and propose a nonlinear damage compensation method based on the VOLTERRA model in the OFDM-PON system, so as to solve the problem that the existing compensation method cannot effectively deal with the OFDM-PON system and the compensation method has high complexity, Low performance and the problem of adaptive coefficient adjustment, improve the reliability and anti-interference ability of the system

Method used

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  • Nonlinear damage compensation method based on VOLTERRA model in OFDM-PON (orthogonal frequency division multiplexing-passive optical network) system
  • Nonlinear damage compensation method based on VOLTERRA model in OFDM-PON (orthogonal frequency division multiplexing-passive optical network) system
  • Nonlinear damage compensation method based on VOLTERRA model in OFDM-PON (orthogonal frequency division multiplexing-passive optical network) system

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Embodiment 1

[0058] see Figure 1-Figure 5 , a nonlinear damage compensation method based on the VOLTERRA model in this OFDM-PON system.

Embodiment 2

[0060] see Figure 1-Figure 5 , the nonlinear damage compensation method based on the VOLTERRA model in the OFDM-PON system: the system of this method is composed of an optical network unit, an optical transmission channel, an optical distribution network, an optical line terminal, and a DSP module. figure 1 shown. The optical network unit includes an electrical domain modulation module and an electro-optical conversion module, the optical line terminal includes a photoelectric conversion module and an electrical domain demodulation module, and the nonlinear damage compensator based on the VOLTERRRA model is implemented in the DSP module. The specific steps are as follows, such as figure 2 Shown:

[0061] Step 1. Store the same sequence in the database at the transmitting end and the receiving end respectively, and use the sequence at the transmitting end as a pilot, where the pilot refers to a sequence interspersed between useful information sequences according to a given ...

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Abstract

The invention discloses a nonlinear damage compensation method based on a VOLTERRA model in an OFDM-PON (orthogonal frequency division multiplexing-passive optical network) system. The method comprises the steps as follows: (1), similar sequences are stored to a database from a transmitting terminal and a receiving terminal; (2), information containing a pilot frequency sequence is transmitted and extracted at the receiving terminal; (3), a K matrix is established according to model characteristics; (4), a VOLTERRA model matrix form is established; (5), an initial value of an identification vector is resolved; (6), a constellation diagram is analyzed to establish a difference factor vector; and (7), a new weight vector is established continuously. With the adoption of the method, various types of nonlinear damage in the OFDM-PON system are identified according to the VOLTERRA model, the resolving complexity is reduced by adopting QR for decomposing matrix dimension, self-adaptive correction processing is performed on identification coefficient vectors, and nonlinear interference resistance and reliability of the system are improved.

Description

technical field [0001] The present invention relates to a method in the technical field of next-generation access system compensation, in particular to an Orthogonal Frequency Division Multiplexing-Passive Optical Networks (OFDM-PON) system based on VOLTERRA Nonlinear compensation method for the model. Background technique [0002] The reliability and anti-interference ability of OFDM-PON system can be improved by using the nonlinear damage compensation method based on VOLTERRA model on the receiver. [0003] The existing nonlinear damage compensation methods are mainly aimed at nonlinear effects such as phase noise, cross-phase modulation, self-phase modulation, four-wave mixing, and additive non-Gaussian noise in optical fiber communication systems. The existing research programs mainly focus on Optical OFDM (Optical OFDM, O-OFDM) system. The existing nonlinear compensation algorithm based on the pilot sequence is as follows: a pre-designed same sequence is stored at the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38
Inventor 方勇路振龙孙彦赞王军华
Owner SHANGHAI UNIV
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