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Optical orthogonal frequency division multiplexing communication method and system based on probabilistic shaping mapping

A technology of multiplexing communication and orthogonal frequency division, applied in transmission system, multi-carrier system, electromagnetic wave transmission system, etc., can solve the problem of high bit error rate required by demodulation algorithm, and achieve the effect of signal quality improvement and high sensitivity

Active Publication Date: 2018-10-09
HUAQIAO UNIVERSITY
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Problems solved by technology

The constellation diagram of ordinary QAM is distributed in a rectangular grid. The more points in the constellation diagram, the greater the amount of information transmitted by each symbol, but at the same time, the distance between constellation points becomes smaller, which requires higher demodulation algorithms and causes bit errors. higher rate

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  • Optical orthogonal frequency division multiplexing communication method and system based on probabilistic shaping mapping
  • Optical orthogonal frequency division multiplexing communication method and system based on probabilistic shaping mapping
  • Optical orthogonal frequency division multiplexing communication method and system based on probabilistic shaping mapping

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Embodiment Construction

[0046] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0047] see Figures 1 to 6 As shown, on the one hand, the present invention is a kind of optical orthogonal frequency division multiplexing (PS-OOFDM) communication method based on probability shaping (probability shaping) mapping, taking 16-QAM as an example, including:

[0048] Step 1) According to the Maxwell-Boltzmann distribution

[0049] (x i =[-3,-1,1,3], take ν=0.384) to generate an optimal lookup table (Lookuptable) with a length of 8, see Figure 6 As shown, that is, the offline probabilistic codebook, its probability distribution can be found in Figure 4 .

[0050] Step 2) Generate a pseudo-random binary bit stream (PBRS signal) through a pseudo-random binary encoder. Generate a new octal symbol L for every 3-bit binary code of one PRBS signal, generate the real part of the QAM signal according to the L-th symbol in the l...

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Abstract

The invention relates to an optical orthogonal frequency division multiplexing communication method and a system thereof based on probabilistic shaping mapping, wherein the method comprises: generating a pseudo random binary bit stream PBRS signal; modulating the PRBS signal to obtain a PS-QAM complex signal; performing serial / parallel conversion, inverse fast Fourier transform and parallel / serialconversion on the PS-QAM complex signal to obtain a baseband OFDM signal, and obtaining an OFDM baseband signal with a cyclic prefix; modulating the OFDM baseband signal onto an optical carrier afterdigital / analog conversion to obtain a PS-OOFDM signal, and transmitting the signal to the optical fiber; converting the PS-OOFDM signal on the optical fiber into an analog OFDM electrical signal; performing analog / digital conversion on the analog OFDM electrical signal to obtain a digital OFDM signal, removing the cyclic prefix, and performing the inverse fast Fourier transform after parallel / serial conversion to obtain the PS-QAM complex signal; separating the real part and the imaginary part of the PS-QAM complex signal, and restoring the corresponding PBRS signal by de-mapping. The invention is capable of achieving shaping gain and improving the spectral efficiency of fiber communication.

Description

technical field [0001] The invention relates to digital modulation technology in the field of optical fiber communication, in particular to an optical orthogonal frequency division multiplexing communication method and system based on probability shaping mapping. Background technique [0002] With the growth of users' demand for transmission, optical fiber communication, as a long-distance and large-capacity transmission method, has become the main direction of communication. Optical Orthogonal Frequency Division Multiplexing (OOFDM) technology combines traditional Orthogonal Frequency Division Multiplexing (OFDM) technology with optical fiber communication technology. The advantages of dispersion have broad application prospects. [0003] Quadrature Amplitude Modulation (Quadrature Amplitude Modulation) can obtain higher spectral efficiency through joint modulation of phase and amplitude. The constellation diagram of ordinary QAM is distributed in a rectangular grid. The ...

Claims

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Application Information

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IPC IPC(8): H04B10/516H04B10/548H04L27/34H04L27/36H04L27/38
CPCH04B10/516H04B10/548H04L27/34H04L27/36H04L27/38
Inventor 董泽吴新星肖庆华由家林曾佑旭张凯明张惠忠
Owner HUAQIAO UNIVERSITY
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