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A CODEC METHOD FOR REDUCING BER IN LACO-OFDM SYSTEM

A codec method and bit error rate technology, applied in the transmission system, multi-frequency code system, digital transmission system, etc., can solve the problems of subcarrier signal bit error rate increase, error transmission, decoding error impact, etc., to reduce errors The effect of transmitting and reducing bit errors

Active Publication Date: 2020-03-03
WUHAN POST & TELECOMM RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This layer-by-layer decoding will cause the decoding error of the upper layer to affect the next layer, forming an error transmission, especially under the condition of a low SNR (Signal-NoiseRatio, signal-to-noise ratio), the bit error rate of the sub-carrier signal after decoding will decrease. A significant increase
This additional bit error due to mistransmission reduces the availability of the LACO-OFDM system at low SNR

Method used

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  • A CODEC METHOD FOR REDUCING BER IN LACO-OFDM SYSTEM
  • A CODEC METHOD FOR REDUCING BER IN LACO-OFDM SYSTEM
  • A CODEC METHOD FOR REDUCING BER IN LACO-OFDM SYSTEM

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0027] A method for encoding and decoding a bit error rate in an LACO-OFDM system according to an embodiment of the present invention, comprising the steps of:

[0028] S1. At the sending end, perform channel coding on the user data to generate redundancy check data, and then perform symbol encoding on the user data and the redundancy check data respectively.

[0029] S2. In the multi-layer frame structure of the system, the redundancy check data symbols are preferentially placed on some low-frequency subcarriers of the first layer, and the user data symbols are placed on other subcarriers.

[0030] S3. At the receiving end, the subcarrier is used as the unit to perform layer-by-layer decoding, and then correct the user data according to the redundancy check data, and then start from the lowest layer where the corrected symbol is located, repe...

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Abstract

A coding and decoding method for a bit error rate in a LACO-OFDM system relates to the field of LACO-OFDM systems. The method comprises the following steps: performing channel coding on user data at atransmitting end to generate redundancy check data, and separately performing symbol coding on the user data and the redundancy check data; in a multi-layer frame structure of the system, preferentially placing the symbols of the redundancy check data on the partial low frequency subcarriers of the first layer, and placing the symbols of the user data on other subcarriers; performing layer-by-layer decoding at the receiving end by taking the subcarriers as units, correcting the user data according to the redundancy check data, and then repeating processes of layer-by-layer decoding and correction is from the lowest layer where the corrected symbol is located until the results of the layer-by-layer decoding and channel decoding are consistent. The method reduces the bit error rate by cyclic error correction and layer-by-layer decoding, and minimizes the error transmission.

Description

technical field [0001] The present invention relates to the LACO-OFDM (Layered Asymmetrically Clipped Optical-Orthogonal Frequency Division Multiplexing) system field, and specifically relates to a coding and decoding method for a bit error rate in the LACO-OFDM system. Background technique [0002] In short-distance optical communication systems, low-cost intensity modulation / direct detection schemes are usually used. The intensity modulation / direct detection scheme requires a modulation format whose signal is always positive, such as PAM (Pulse Amplitude Modulation, Pulse Amplitude Modulation), DCO-OFDM (DirectCurrentBiased Optical-Orthogonal Frequency Division Multiplexing, DC Biased Optical Orthogonal Frequency Division Multiplexing), ACO-OFDM (AsymmetricallyClipped Optical-Orthogonal Frequency Division Multiplexing, Asymmetrically Clipped Optical-Orthogonal Frequency Division Multiplexing), etc. DCO-OFDM adds a bias DC signal to the OFDM (Orthogonal Frequency Division ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/116H04L1/00H04L27/26
CPCH04B10/116H04L1/0009H04L1/0061H04L27/2691
Inventor 刘武杨超
Owner WUHAN POST & TELECOMM RES INST CO LTD