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Channel equalization system and method for independent error correction code modulation of subcarriers in optical OFDM (orthogonal frequency division multiplexing)

An error correction coding and channel equalization technology, applied in the field of channel equalization system, can solve problems such as insufficient flexibility, and achieve the effect of optimizing spectrum efficiency utilization

Inactive Publication Date: 2014-03-26
WUHAN POST & TELECOMM RES INST CO LTD
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Problems solved by technology

For these situations, the traditional unified channel power equalization at the sending end is not flexible enough and needs to be improved urgently.

Method used

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  • Channel equalization system and method for independent error correction code modulation of subcarriers in optical OFDM (orthogonal frequency division multiplexing)
  • Channel equalization system and method for independent error correction code modulation of subcarriers in optical OFDM (orthogonal frequency division multiplexing)
  • Channel equalization system and method for independent error correction code modulation of subcarriers in optical OFDM (orthogonal frequency division multiplexing)

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] see figure 2 As shown, the embodiment of the present invention provides a channel equalization system for subcarrier independent error correction coding and modulation in optical OFDM, including a sending end and a receiving end, and the sending end includes a first serial-to-parallel converter and N FECs (Forward Error Correction, Forward error correction) encoding unit, N modulation format mapping units, transmission power equalization unit, inverse Fourier transform unit, first parallel-serial converter and electro-optical converter, N is an integer greater than or equal to 2, each subcarrier at the transmitting end The channel includes an FEC encoding unit and a modulation format mapping unit, and the receiving end includes a photoelectric converter, a second serial-to-parallel converter, a Fourier transform unit, N modula...

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Abstract

The invention discloses a channel equalization system and method for independent error correction code modulation of subcarriers in optical OFDM (orthogonal frequency division multiplexing), and relates to the field of optical fiber communication. The method includes the steps: distributing serial data onto a plurality of parallel subcarriers after the serial data pass a serial-parallel converter of a transmitting end, independently performing error correction code and modulation format mapping by each subcarrier, arranging the subcarriers with the same error correction code type and the same modulation format mapping type into a group, equalizing the transmitting power of the subcarriers in the same group, keeping the SNR (signal to noise ratio) of a receiving end by the subcarriers with the same error correction code and modulation format mapping, converting signals from frequency domain to time domain by the aid of inverse Fourier transform, and performing parallel-serial conversion and electro-optical conversion; enabling the process of the receiving end to be opposite to that of the transmitting end. Error correction code and modulation format mapping combinations of the subcarriers can be flexibly selected, spectral efficiency utilization of each subcarrier is optimized, and point-to-multipoint application requirements are met.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a channel equalization system and method for subcarrier independent error correction coding modulation in optical OFDM. Background technique [0002] With the rapid development of multimedia technology, people's demand for information continues to increase. In order to meet the ever-increasing demand for capacity, the research on the key technologies of the next-generation optical transport network exceeding 100bit / s or even 1Tb / s is being carried out in full swing all over the world. In order to improve the capacity of the existing WDM system, high spectral efficiency modulation format and single channel high rate are considered to be an effective solution. By increasing the baud rate of a single optical carrier combined with high-order modulation formats, the channel rate is limited. In order to break through the limitation of the bandwidth of electronic devices and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B10/25
Inventor 罗鸣胡荣肖潇杨奇余少华
Owner WUHAN POST & TELECOMM RES INST CO LTD
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