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oofdm method and system based on ldpc coded probability shaping map

A PS-OFDM, probabilistic technology, applied in the field of optical fiber communication, can solve the problems of smaller constellation point spacing, improve demodulation algorithm requirements and bit error rate, etc., achieve the effect of hardware complexity guarantee and improve nonlinear tolerance

Active Publication Date: 2021-06-29
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 increases the requirements for demodulation algorithms and errors. code rate

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  • oofdm method and system based on ldpc coded probability shaping map
  • oofdm method and system based on ldpc coded probability shaping map
  • oofdm method and system based on ldpc coded probability shaping map

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Embodiment Construction

[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

A DFT spread spectrum OOFDM method and system based on LDPC coding probability shaping mapping of the present invention, comprising: generating a pseudo-random binary bit stream; sending the binary bit stream to an LDPC encoder and an interleaver to generate an interleaved binary bit stream; basing the bit stream on probability The codebook is mapped to obtain the PS-QAM signal; the PS-QAM signal is spread through the P-point discrete Fourier transform and subcarrier mapping; the Q-point fast Fourier inverse transform is performed on the spread signal and then a cyclic prefix is ​​added to generate The digital PS‑OFDM baseband signal is converted into an analog PS‑OFDM baseband signal through digital / analog conversion, and the analog PS‑OFDM baseband signal is modulated onto the optical carrier by an optical intensity modulator to obtain a PS‑OOFDM signal, which is sent into a single-mode fiber The original input signal is obtained by demodulating the signal after transmission. The invention can reduce the peak-to-average power ratio of the OOFDM signal and improve the sensitivity of the optical receiver.

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