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Non-uniform modulation and demodulation method and system in wireless broadcast communication system, medium and terminal

A communication system and wireless broadcasting technology, applied in the field of physical layer transmission, can solve the problem of non-symmetry of in-phase component and quadrature component, and achieve the effect of reducing demodulation complexity and reducing complexity

Active Publication Date: 2019-11-26
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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AI Technical Summary

Problems solved by technology

Since the in-phase and quadrature components of the 2D-NUC constellation are often asymmetrical, it is impossible to decompose one QAM demodulation into two PAM demodulations

Method used

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  • Non-uniform modulation and demodulation method and system in wireless broadcast communication system, medium and terminal
  • Non-uniform modulation and demodulation method and system in wireless broadcast communication system, medium and terminal
  • Non-uniform modulation and demodulation method and system in wireless broadcast communication system, medium and terminal

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Embodiment Construction

[0027] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...

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Abstract

The invention provides a non-uniform modulation and demodulation method and system in a wireless broadcast communication system, a medium and a terminal, and the method comprises the following steps:dividing a constellation point into four groups of different subsets, enabling the four groups of different subsets to respectively correspond to four different quadrants where a received signal falls, and calculating a search space corresponding to each subset; calculating the Euclidean distance between the constellation point of the search space corresponding to the quadrant and the received signal according to the quadrant to which the received signal belongs; and based on the calculated Euclidean distance, obtaining log likelihood ratio information through a Log _ Map or Max _ Log _ Map algorithm. According to the non-uniform modulation and demodulation method and system in the wireless broadcast communication system, the medium and the terminal, the complexity of non-uniform modulation and demodulation in the wireless broadcast communication system can be reduced, and no performance loss exists.

Description

technical field [0001] The present invention relates to the technical field of physical layer transmission in a communication system, in particular to a non-uniform modulation and demodulation method, system, medium and terminal in a wireless broadcast communication system. Background technique [0002] With the rapid development of the world's economy and culture, users' demand for wireless information services is increasing rapidly. Relying solely on the traditional wireless broadcast network or the traditional wireless two-way communication network, it has been impossible to realize the optimal transmission of information services. At the same time, people are no longer satisfied with watching traditional wireless broadcast TV services, but have increasingly strong demands for new wireless broadcast TV services. The next-generation broadcast network wireless system (Next-Generation Broadcast Network Wireless System, NGB-W) can realize the fusion and coexistence of wirele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04M11/06H04W4/06H04L27/34
CPCH04L27/34H04L27/3483H04M11/066H04W4/06
Inventor 王芳王琛邢留记李明齐封松林
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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