A kind of optical OFDM system based on superposition training sequence and its frame synchronization method

A training sequence and frame synchronization technology, applied in the field of optical communication, can solve the problems of reducing system spectrum efficiency and reducing transmitter power efficiency, etc., to achieve reduced PAPR performance, good auto-correlation and weak cross-correlation, and transmitter power efficiency Improved effect

Inactive Publication Date: 2011-12-21
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, these are all data-assisted serial sequence synchronization methods, which not only reduce the spectral efficiency of the system, but also reduce the power efficiency of the transmitter.

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  • A kind of optical OFDM system based on superposition training sequence and its frame synchronization method
  • A kind of optical OFDM system based on superposition training sequence and its frame synchronization method
  • A kind of optical OFDM system based on superposition training sequence and its frame synchronization method

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[0058] In the following, the invention of an optical OFDM system based on superimposed training sequences and its frame synchronization method will be further described in detail in conjunction with specific implementation methods. It should be noted that the main specific parameters of the simulation in this paper are: the transmitted data bit stream is 10Gbit / s, the modulation method is 16-QAM, the number of subcarriers N is 128, the cyclic prefix length is N / 4, and the optical fiber link part adopts 1310nm The multimode fiber is used, the attenuation constant α=0.2dB / km, considering the dispersion effect, the value is 17ps / nm km, the sensitivity of the PIN photodetector is set to 1A / W, and the dark current is 10nA. But the setting of these parameters does not affect the generality of this patent.

[0059] figure 1 It is a block diagram of the optical OFDM system based on the superposition training sequence of the present invention. The optical OFDM system based on superp...

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Abstract

The invention discloses an optical OFDM system based on superimposed training sequences and a frame synchronization method thereof. The system scheme includes an optical line terminal (OLT) and an optical network terminal (OUN), wherein the OLT mainly includes a training sequence generation module, a Hermitian conjugate Symmetry module, data OFDM signal generation module, training sequence and data OFDM signal superposition module, optical modulation module; OUN mainly includes optical demodulation module, OFDM signal receiving module, channel estimation module, training sequence and data symbol separation module. The frame synchronization method is obtained based on the correlation between the processed received signal and the local training sequence, which can prevent the receiving end from using a large amount of data for blind synchronization and increasing the complexity of the receiver design. At the same time, a method for constructing an autocorrelation training sequence is also disclosed. The system and the frame synchronization method involved in the invention can effectively improve the spectrum utilization rate and the power efficiency of the transmitter, and have the advantages of simple design principle, strong practicability, and low signal processing requirements.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and relates to an optical orthogonal frequency division multiplexing (O OFDM) system and a frame synchronization method based on superposition training sequences. Background technique [0002] With the rapid development of communication technology, data communication services have brought about a sharp increase in the demand for transmission network capacity and transmission bandwidth. People began to consider upgrading the existing optical fiber communication system. Because OFDM technology has the advantages of high spectral efficiency and has achieved great success in wireless communication systems, people have proposed the idea of ​​using OFDM modulation technology for optical fiber link transmission, and experimental data have proved that OFDM signals can effectively fight against optical fiber transmission. Chromatic dispersion and polarization mode dispersion, using a single-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04B10/12H04B10/25
Inventor 罗仁泽戈勇华
Owner SOUTHWEST PETROLEUM UNIV
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