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16QAM system LT code modulation method

A coding modulation and coding bit technology, applied in the field of LT coding and modulation scheme of 16QAM system, to achieve the effect of good bit error rate performance

Active Publication Date: 2018-06-05
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The present invention aims to overcome the deficiencies of the prior art, provides a 16QAM system LT coding and modulation scheme, and solves the technical problem of how to improve the bit error rate performance of the high-order modulation system LT code in a Gaussian white noise channel

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Embodiment Construction

[0028] The implementation of the present invention provides a new 16QAM system LT coding and modulation scheme, those skilled in the art can understand that, unless otherwise defined, all terms (comprising technical terms and scientific terms) used herein have the common meaning in the field to which the present invention belongs A skilled person generally understands the same meaning. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein Explanation.

[0029] Taking the complex Gaussian white noise channel with a signal-to-noise ratio of 0dB as an example, after the traditional 16QAM system LT coding and modulation, the bit likelihood ratio calculated by the receiving end obeys two different distributions, as follows: image 3 and Figure 4 shown. ...

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Abstract

The invention discloses a 16QAM system LT code modulation method, belonging to the technical field of digital communication. By studying bit likelihood ratio during belief-propagation decoding, the invention provides a new 16QAM mapping planisphere, and provides a corresponding system LT code modulation scheme. According to the code modulation scheme, good bit error rate performance can be provided by utilizing degree distribution under BPSK.

Description

technical field [0001] The invention discloses a new 16QAM system LT coding and modulation scheme under a Gaussian white noise channel, belonging to the technical field of digital communication. Background technique [0002] In the communication system, in order to solve the problem of low data transmission efficiency that may be brought about by the ARQ (Automatic Repeat reQuest) technology, people put forward the concept of a digital fountain. A popular explanation for the digital fountain is that the source sends codewords continuously like a fountain, and the receiver successfully decodes and sends a feedback message to the source after receiving a certain number of codewords. This is like receiving water in a cup under a fountain, and the cup is filled with water, which means that the receiving end has successfully decoded, such as figure 1 shown. [0003] LT (Luby Transform) code is the first digital fountain code with practical significance. The main parameter of th...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L27/36
CPCH04L1/0041H04L1/0057H04L27/36
Inventor 许生凯徐大专
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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