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

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,...

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

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