Review on Digital Signal Modulation Methods and Recognition Performance Characteristics in Embedded Systems

In recent years, digital signal modulation identification has gradually become an important research direction applied to embedded systems in the field of communication engineering with its good information confidentiality and noise resistance. Scholars at home and abroad have achieved a large number of research results in this field, the paper focuses on reviewing the exploration of signal modulation and identification methods in embedded systems by relevant researchers in the past two decades, and systematically combing and discussing the results in terms of digital modulation technology and adaptive modulation identification technology, respectively, with the main line of the research means. In terms of digital signal modulation technology, the basic principles and scope of application of three mature technologies, namely frequency modulation, amplitude modulation and phase modulation, are compared and analyzed, and an improved frequency shift keying modulation signal blind recognition method is proposed for the problems of modulation; in terms of adaptive modulation recognition, the current mainstream methods are outlined according to the recognition principles and applicable scenarios, and the recognition rate for the case of low signal-tonoise ratio is studied, and its development and advantages are investigated. and summarizes and analyzes its development and advantages and disadvantages. Finally, this paper gives the development trend of digital modulation recognition scheme for embedded systems and future expectations.