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Minimum Eustachian distance maximized constellation mapping cascade error-correction coding method

A technology of constellation mapping and Euclidean distance, applied in the field of constellation mapping cascade error correction coding, can solve the problems of increasing redundancy and reducing system transmission efficiency

Inactive Publication Date: 2003-07-16
TSINGHUA UNIV
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Problems solved by technology

[0022] The serial cyclic system convolutional code SCCC improves the anti-error performance of the system, but reduces the transmission efficiency of the system due to the increase of redundancy.

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  • Minimum Eustachian distance maximized constellation mapping cascade error-correction coding method
  • Minimum Eustachian distance maximized constellation mapping cascade error-correction coding method
  • Minimum Eustachian distance maximized constellation mapping cascade error-correction coding method

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Embodiment Construction

[0049] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] The implementation steps of the constellation mapping cascaded error correction coding method for maximizing the minimum Euclidean distance of the present invention for the transmitting embodiment are as follows:

[0051] 1. Optional preprocessing is carried out to the input digital signal (RS error correction coding in this embodiment)

[0052] 2. Carry out 2 / 3 code rate system code encoding;

[0053] 3. Perform random bit interleaving on the data formed by encoding the 2 / 3 code rate systematic convolutional code;

[0054] 4. Perform QAM modulation on the randomly interleaved data, and its symbol constellation mapping satisfies the maximization of the minimum Euclidean distance;

[0055] 5. The signal after QAM modulation can be further modulated by OFDM, and then sent to the channel for transmission after processing such as shaping ...

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Abstract

A constellation mapping cascaded error-correcting encode method with maximizing the minimal Euclidean distance includes encoding the input digital signals by systen convolution code, random bit interleaving processing to data, and performing mQAM modulation to data. The sign constellation mapping relative conforms with the maximization of minimal Euclidean distance between correlative codes. The sign constellation mapping code as the internal code of cascaded error-correcting code and said system conveolution code constitute a cascaded system convolution code. It has high error-correcting performance with less iteractive operations.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and in particular relates to a constellation mapping cascade error correction coding method. Background technique [0002] In digital video communication, since wireless channels and optical fiber channels are all band-pass channels, baseband digital signals need to be modulated for transmission in a certain channel. Modulation is essentially a function transformation process, which maps the binary sequence to be transmitted (usually channel coded and constitutes a signal frame) to a carrier waveform with certain properties. For a carrier, the properties that can be changed include amplitude, frequency, and phase. Therefore, there are three basic digital modulation methods, namely amplitude shift keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK). The existing digital modulation forms can be regarded as the deformation and combination of these three...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M13/23H04J11/00H04L27/32
Inventor 杨林杨知行
Owner TSINGHUA UNIV
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