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

A communication system and wireless broadcasting technology, which is applied in the field of physical layer transmission, can solve the problem of non-symmetry of the in-phase component and the quadrature component

Active Publication Date: 2020-10-23
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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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

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

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Embodiment Construction

[0027] The following describes the implementation of the present invention through specific specific examples. 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 embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other if there is no conflict.

[0028] It should be noted that the illustrations provided in the following embodiments only illustrate the basic idea of ​​the present invention in a schematic manner. The figures only show the components related to the present invention instead of the number, shape, and number of components in actual i...

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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 world economy and culture, users' demand for wireless information services has grown rapidly. Relying on traditional wireless broadcasting network or traditional wireless two-way communication network alone, it is no longer possible to achieve optimal transmission of information services. At the same time, people are no longer satisfied with just watching traditional wireless broadcast television services, but have an increasingly strong demand for new wireless broadcast television services. The Next-Generation Broadcast Network Wireless System (NGB-W) can realize the fusion and coexistence of wireless broadcasting and wireless two-way communication,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38H04L27/34H04M11/06H04W4/06
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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