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Optical OFDM signal coded modulation and demodulation system and method based on polarization code

A signal encoding and demodulation system technology, applied in the direction of modulated carrier system, error detection by signal space encoding, multi-frequency code system, etc., can solve the problem of inability to flexibly use spectrum resources and achieve resistance to frequency selective fading , Improve frequency band utilization, reduce the effect of encoding and decoding complexity

Inactive Publication Date: 2016-11-16
SHANGHAI JIAO TONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the entire modulation rule only completes the modulation on a single carrier, and cannot flexibly use limited spectrum resources

Method used

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  • Optical OFDM signal coded modulation and demodulation system and method based on polarization code
  • Optical OFDM signal coded modulation and demodulation system and method based on polarization code
  • Optical OFDM signal coded modulation and demodulation system and method based on polarization code

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Embodiment Construction

[0044] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0045] Such as figure 1 Shown, a kind of optical OFDM signal coding modulation and demodulation system based on polar code, it is characterized in that, described system comprises:

[0046] The polar code encoding unit is used to encode the user information to be transmitted into a code word to be transmitted through the coding rules of the polar code;

[0047] A high-order mapping unit, configured to perform high-order mapping on the codeword encoded by the polar code, and map it to the constellation ...

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Abstract

The present invention proposes a polar code-based optical OFDM signal coding modulation and demodulation system and method, the system includes a polar code coding unit, a high-order mapping unit, a subcarrier mapping unit, a pilot frequency acquisition unit, and an OFDM modulation unit , an optical transmitting and receiving unit, an OFDM demodulation unit, a subcarrier recovery unit, a high-order demapping unit, and a polar code decoding unit. User information is coded by polar code and then mapped to the corresponding carrier through high-order modulation. After IFFT, the conversion of frequency domain signal to time domain signal is realized, and then modulated onto the channel for transmission. The receiving end performs FFT on the signal, recovers the subcarrier signal, high-order soft demodulation and SC decoding of the polar code to restore the original user signal to realize the transmission of the entire system. The present invention combines polar codes with high-order modulation and carrier mapping, and can flexibly apply spectrum resources available in the system. The introduction of high-order modulation technology improves the transmission rate of information, and the introduction of polar codes improves the reliability of information transmission.

Description

technical field [0001] The present invention belongs to the technical field of optical communication, and specifically relates to a modulation and demodulation method and a corresponding system that combine polar codes with optical OFDM (Orthogonal Frequency Division Multiple) signals, and use channel coding and high-order modulation to simultaneously improve system performance. Background technique [0002] With the development of Internet technology and the continuous increase of data traffic, people's demand for network bandwidth is increasing. On the one hand, the originally limited frequency band resources become more scarce, and on the other hand, the data transmission rate exceeds the maximum transmission rate supported by the existing technology. However, the traditional channel coding method or the traditional high-order modulation method alone cannot meet the requirements of these two aspects. Polar codes are currently the only constructive coding schemes that ac...

Claims

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Application Information

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IPC IPC(8): H04B10/556H04L1/00H04L27/26
CPCH03M13/13H03M13/251H04B10/556H04L1/0056H04L27/2628H04L27/265
Inventor 方佳飞肖石林张鹿刘凌张云昊
Owner SHANGHAI JIAO TONG UNIV
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