Research Status and Trend of Automatic Modulation Recognition of Aliasing Communication Signals
The modulation and identification of communication signals is extremely critical fields such as electronic counter-measures and spectrum management.However,the rapid development of wireless communication technology has made spectrum re-sources increasingly tight,and broadband receivers will inevitably receive more time-frequency aliasing a narrowband signal.The number and types of aliased signal combinations are extremely wide,which brings great challenges to the identification module of the receiver.In this paper,the technology of automatic modulation and identification of mixed communication signals is comprehen-sively described.First,the important position of modulation identification in the military and civilian fields is introduced,and the countermeasures for aliasing phenomena are discussed in combination with single-signal identification algorithms.Secondly,three mainstream methods for aliasing are given.The research methods of automatic signal modulation recognitionanalyze the advantages and disadvantages of each method,and make a detailed development of the alias signal recognition method based on feature extrac-tion and the alias signal recognition method based on neural network.Future research directions are further prospected.
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