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Design method of 4D-QPSK constellation based on Anti-Gray mapping

A 4D-QPSK, 3D-QPSK technology, applied in the direction of digital transmission system, electrical components, error prevention, etc., can solve the problem of error-prone information transmission

Inactive Publication Date: 2013-12-11
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology

However, in the actual wireless communication environment, due to the influence of multipath fading and Doppler effect, information transmission is more error-prone

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  • Design method of 4D-QPSK constellation based on Anti-Gray mapping
  • Design method of 4D-QPSK constellation based on Anti-Gray mapping
  • Design method of 4D-QPSK constellation based on Anti-Gray mapping

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Embodiment Construction

[0020] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0021] figure 1 is a flow chart showing the 4D-QPSK constellation design method based on Anti-Gray mapping according to the present invention. refer to figure 1 , the 4D-QPSK constellation design method based on Anti-Gray mapping according to the present invention includes the following steps: Step S1, based on the 2D-QPSK constellation of Anti-Gray mapping, according to the principle that the Hamming distance of the minimum Euclidean distance is greater than or equal to 2, Generate the 3D-QPSK constellation of Anti-Gray mapping; step S2, modify the bit identification of 3D to be the bit identification of 4D, increase the highest bit of the 3D coo...

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Abstract

The invention discloses a design method of a 4D-QPSK constellation based on Anti-Gray mapping. The design method comprises the following steps: (1) according to a 2D-QPSK constellation based on Anti-Gray mapping, generating a 3D-QPSK constellation based on Anti-Gray mapping according to the principle that the Hamming distance of the minimum Euclidean distance is greater than or equal to 2; (2) correcting a 3D bit marker into a 4D bit marker, adding the highest order of a 3D coordinate marker, and constructing a 4D coordinate marker; (3) constructing a 4D-QPSK hypercube constellation according to the constructed 4D bit marker and 4D coordinate marker and the principle that the Euclidean distance of a constellation point with the Hamming distance being 1 is maximal; and (4) outputting the corresponding relationship between the 4D bit marker and the 4D-QPSK constellation coordinate marker based on Anti-Gray mapping.

Description

technical field [0001] The invention relates to a digital communication system, in particular to a 4D-QPSK constellation design method based on Anti-Gray mapping. Background technique [0002] The fundamental task of digital communication systems, especially wireless communication systems, is to provide high-speed, efficient and error-free transmission of digital information using limited bandwidth. Modulation technology is an effective method and an important means to realize the fundamental task of wireless communication system. For typical digital communication systems, digital modulation techniques mainly include constellation mapping techniques and carrier modulation techniques. The so-called constellation mapping is to map the binary bit stream carrying digital information into symbols suitable for channel transmission. Constellation mapping includes two elements, namely constellation diagram and constellation point mapping method. The constellation diagram represen...

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Application Information

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IPC IPC(8): H04L27/20H04L1/00
Inventor 方伟伟陈远知
Owner COMMUNICATION UNIVERSITY OF CHINA