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Optical OFDM signal coding modulation and demodulation system and method based on polar code

A technology of signal coding and demodulation system, applied in the direction of error detection by signal space coding, multi-frequency code system, transmission system, etc., can solve problems such as inability to flexibly use spectrum resources, and achieve good resistance to frequency selective fading, The effect of good narrowband characteristics and low coding and decoding complexity

Inactive Publication Date: 2019-01-25
SHANGHAI JIAO TONG UNIV
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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 coding modulation and demodulation system and method based on polar code
  • Optical OFDM signal coding modulation and demodulation system and method based on polar code
  • Optical OFDM signal coding modulation and demodulation system and method based on polar code

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Embodiment Construction

[0045] 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.

[0046] 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:

[0047] 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;

[0048] 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 invention provides an optical OFDM signal coded modulation and demodulation system and method based on a polarization code. The system comprises a polarization code coding unit, a high-order mapping unit, a sub-carrier mapping unit, a pilot frequency obtaining unit, an OFDM modulation unit, an optical transmitting and receiving unit, an OFDM demodulation unit, a sub-carrier recovery unit, a high-order demapping unit and a polarization code decoding unit. After being coded through the polarization code, user information is mapped to a corresponding carrier through high-order modulation mapping; conversion from a frequency-domain signal to a time-domain signal is realized after IFFT; then, the signal is modulated onto a channel to transmit; a receiving end recovers the original user signal after performing FFT, sub-carrier signal recovery, high-order soft demodulation and SC decoding of the polarization code of the signal; and thus, transmission of the whole system is realized. According to the optical OFDM signal coded modulation and demodulation system and method disclosed by the invention, the polarization code is combined with high-order modulation and carrier mapping; available spectrum resources in the system can be applied flexibly; due to introduction of the high-order modulation technology, the information transmission rate is improved; and, due to introduction of the polarization code, the information transmission reliability is improved.

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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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/556H04L1/00H04L27/26
CPCH03M13/13H03M13/251
Inventor 方佳飞肖石林张鹿刘凌张云昊
Owner SHANGHAI JIAO TONG UNIV
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