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Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform

A converter and optical signal technology, applied in the field of PAPR reduction in optical OFDM systems, can solve the problems of affecting optical fiber nonlinearity, high peak-to-average power ratio, and increase system cost, and achieve excellent overall performance, good PAPR performance, and signal recovery. ideal effect

Inactive Publication Date: 2017-01-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

High peak-to-average power ratio (PAPR) is one of the main disadvantages of OOFDM systems. High PAPR will not only increase system complexity and system cost, but also affect the nonlinearity of optical fibers.

Method used

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  • Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform
  • Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform
  • Method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform

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Embodiment

[0032] The CO-OFDM system block diagram of the proposed method, such as figure 2 shown. The RF OFDM transmitter module mainly processes baseband signals, including serial-to-parallel conversion, subcarrier mapping, fast Hada code conversion, improved μ-law companding conversion, inverse fast Fourier transform, cyclic prefix, and digital-to-analog conversion Wait. An RF-to-optical upconverter uses an IQ modulator to convert an electrical signal into an optical signal. The optical OFDM signal transmitted through the optical fiber link uses coherent detection technology in the optical-to-RF down-converter to realize the transformation from optical signal to electrical signal. The RF OFDM receiver transforms the electrical signal inversely to that of the transmitter. The work of RF OFDM transmitter and receiver is realized by matlab software, and the parts of RF-to-optical up-converter, optical channel and optical-to-RF down-converter are completed by optisystem software.

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Abstract

The invention discloses a method for restraining PAPR of optical OFDM system based on FHT and improved Mu law companding transform to firstly improve the traditional Hadamard transform and Mu law companding transform and then perform the cascade connection. The computation complexity of fast Hadamard transform is much lower than Hadamard transform and the improved Mu law companding transform may undertake joint optimization for peak-to-average ratio performance and error rate performance, control the single BER performance while reducing single PAPR and eliminate the band spectrum regeneration resulting from signal distortion in the course of repetition. After the fast Hadamard transform for single is completed, the PAPR of single reduces a little. While the companding transform is performed for the single, the predistortion of single will not be too serious. Thus, when undertaking the inverse transformation in the receiving end, the single will be recovered better. The PAPR performance after using the provided method is better than the performance after separately adopting one of methods and the comprehensive performance is superior to traditional SLM and PTS.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and signal processing, in particular to reducing PAPR in an optical OFDM system. Background technique [0002] Optical Orthogonal Frequency Division Multiplexing (OOFDM), as a new type of multi-carrier modulation technology, has become one of the research hotspots in the field of optical communication in recent years due to its unique advantages, especially Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) The superiority of the system in terms of spectral efficiency, receiver sensitivity, and dispersion resistance makes it an important solution for realizing high-speed, large-capacity, and long-distance optical fiber communications in the future. High peak-to-average power ratio (PAPR) is one of the main disadvantages of OOFDM systems. High PAPR will not only increase system complexity and cost, but also affect the nonlinearity of optical fibers. At presen...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B10/556H04L25/49
CPCH04L27/2614H04B10/556H04L25/49H04L27/2628
Inventor 童峥嵘王雅茹张卫华
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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