Automatic modulation recognition of digital communication signals based on a decision-theoretic approach

For the using of multi-modulation,the precondition of receiving and demodulating signal is to decide the type of the modulation.So automatic recognition of modulation signal is a required function of software radio receiver.In this paper,six types of digital modulations are recognized by using four effective key features and utilising the decision-theoretic approach.The simulation results shows that overall success rate is over 99% at SNR≥5dB and 100% at SNR≥20 dB.This algorithm is verified by its good performance.It has simple structure,less calculation and good performance of real time.It can realize automatic modulation recognition.