OOFDM method and system based on LDPC coding probability shaping mapping

A PS-OFDM and probabilistic technology, applied in the field of optical fiber communication, can solve the problems of improving demodulation algorithm requirements and bit error rate, and reducing the distance between constellation points

Active Publication Date: 2019-05-14
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

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  • OOFDM method and system based on LDPC coding probability shaping mapping
  • OOFDM method and system based on LDPC coding probability shaping mapping
  • OOFDM method and system based on LDPC coding probability shaping mapping

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[0070] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0071] see Figures 1 to 5 Shown, on the one hand, a kind of DFT spread spectrum OOFDM method based on LDPC encoding probability shaping mapping of the present invention, comprises the steps:

[0072] Step 1) According to the principle that the high-order QAM signal is mapped to the low-order QAM signal constellation diagram, a length of 2 is generated. n The optimal look-up table (Look-up table) is used for probabilistic shaping (probabilistic shaping) mapping, and the optimal look-up table is the offline probabilistic codebook LUT.

[0073] Step 2) Generate a pseudo-random binary bit stream (PRBS) signal by Matlab, and the binary bit stream signal passes through a binary LDPC encoder to generate a binary bit stream modulated by LDPC encoding, and then send it into the interleaver for interleaving operation; the interleaver performs int...

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Abstract

The invention discloses a DFT spread spectrum OOFDM method and system based on LDPC coding probability shaping mapping. The DFT spread spectrum OOFDM method comprises the steps of generating a pseudorandom binary bit stream; Sending the binary bit stream into an LDPC encoder and an interleaver to generate an interleaved binary bit stream; Mapping the bit stream based on a probability codebook to obtain a PS-QAM signal; Performing P-point discrete Fourier transform and subcarrier mapping on the PS-QAM signal to complete spectrum spreading; carrying out Q-point fast Fourier inversion on the spread signal, then adding a cyclic prefix, generating a digital PS-OFDM baseband signal, converting the digital PS-OFDM baseband signal into an analog PS-OFDM baseband signal through digital/analog conversion, and modulating the analog PS-OFDM baseband signal onto an optical carrier through a light intensity modulator to obtain PS-OFDM baseband signal; sending the OOFDM signal to a single-mode optical fiber for transmission, and modulating the signal to obtain an original input signal. The OOFDM signal peak-to-average power ratio can be reduced, and the sensitivity of the optical receiver is improved.

Description

technical field [0001] The present invention relates to digital modulation technology in the field of optical fiber communication, in particular to a DFT (Discrete Fourier Transform) spread spectrum OOFDM method and system based on LDPC (low-density parity-check) encoding probability shaping mapping . Background technique [0002] With the rapid increase of users' demand for transmission distance and capacity, optical fiber communication has become the mainstream of communication. Optical Orthogonal Frequency Division Multiplexing (OOFDM) technology combines traditional Orthogonal Frequency Division Multiplexing (OFDM) technology with optical fiber communication technology, which has both high-speed access, large information capacity, high spectrum utilization, and high-order The advantages of superior modulation expansion ability and good anti-dispersion and polarization mode dispersion of optical fiber transmission have attracted people's attention. However, Optical Orth...

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Application Information

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IPC IPC(8): H04L27/26H04L1/00H04B10/54H04B10/516
Inventor 董泽吴新星陈逸凡
Owner HUAQIAO UNIVERSITY
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