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Low-complexity peak-to-average ratio restraining method for optical communication DCO-OFDM (direct current-biased optical-orthogonal frequency division multiplexing) system

A DCO-OFDM, peak-to-average ratio suppression technology, applied in the field of optical communication DCO-OFDM system peak-to-average ratio suppression, can solve the problem of high peak-to-average ratio of transmission signals, and achieve the effect of reducing the peak-to-average ratio

Inactive Publication Date: 2015-07-01
LINYI UNIVERSITY
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the peak-to-average ratio of the DCO-OFDM system transmission signal is too high in optical communication, and proposes a method for suppressing the peak-to-average ratio of the DCO-OFDM system

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  • Low-complexity peak-to-average ratio restraining method for optical communication DCO-OFDM (direct current-biased optical-orthogonal frequency division multiplexing) system

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Embodiment Construction

[0020] Specific embodiments of the present invention will be given below in conjunction with the accompanying drawings. It should be noted that the parameters in the examples do not affect the generality of the present invention.

[0021] Before elaborating the specific implementation, first introduce the principle of sub-block segmentation: let the length be data vector Divided into block , and satisfy is a positive integer, and the common segmentation methods mainly include adjacent segmentation, interleaving segmentation and random segmentation.

[0022] Then when using adjacent delivery

[0023] ,

[0024] in , are vectors and First elements.

[0025] When using interleaved segmentation, there are

[0026] ,

[0027] When using random partitioning, randomly assigned to First elements, and can only belong to one of the sub-blocks.

[0028] Regardless of the method of division, The non-zero elements in are all non-overlapping, and satisf...

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Abstract

The invention discloses a low-complexity peak-to-average ratio restraining method for an optical communication DCO-OFDM (direct current-biased optical-orthogonal frequency division multiplexing) system. The low-complexity peak-to-average ratio restraining method comprises the following steps of firstly, performing precoding DFT (discrete Fourier transform) on inputted digital modulation signs so as to reduce correlation between the signs; secondly, performing subblock division and conjugate symmetry on a precoded data sequence; and finally, selecting a suboptimal phase twiddle factor for each subblock so as to reduce a peak-to-average ratio. Because IFFT (inverse fast Fourier transform) and suboptimal iterative loop phase factor selection are carried out sequentially, the implementing complexity of the system can be reduced while the peak-to-average ratio is restrained.

Description

technical field [0001] The invention belongs to the technical field of communication, in particular to a peak-to-average ratio suppression method for an optical communication DCO-OFDM system. Background technique [0002] Optical communication DC biased Orthogonal Frequency Division Multiplexing (Direct Current-biased Optical-Orthogonal Frequency Division Multiplexing, DCO-OFDM) system uses multi-carrier modulation, when the input signal is inverse fast Fourier transform (Inverse Fast Fourier Transform , IFFT) when superimposed with the same phase, a higher peak power will be generated, resulting in an excessively high peak-to-average ratio of the transmitted signal. In order to prevent the transmission signal with an excessive peak-to-average ratio from being distorted when passing through the power amplifier, the amplifier must be required to have a wide linear amplification dynamic range, thereby increasing the system cost. The peak-to-average ratio suppression function ...

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Application Information

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IPC IPC(8): H04L27/26H04Q11/00H04B10/25
Inventor 王九如
Owner LINYI UNIVERSITY
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