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Indian Institute of Technology (IIT) Patna 
A blind modulation classification (BMC) method for linearly modulated signal over single carrier system 
Dr. Sudhan Majhi Mr. Rahul Gupta Mr. B Jeevan Prakash 
Indian Institute of Technology (IIT) Patna 
Application type:
Applied - 2016-01-19 
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Indian Institute of Technology (IIT) Patna 
A blind modulation classification (BMC) method has been proposed and implemented for singre carrier *nea.y modurated signars. The proposed method is feature based (FB) method,i.e.,acombinationofbothelementaryandcycliccumulantapproachis adopted which gives an optimal performance over a fading channel environment even at low signal to noise ratio (sNR) values' The elementary fourth order cumulant is used to decide whether the modulation conste*ation is from rear, circular or rectangular' it is also known as macro modulation classifler' on the other hand' cyclic cumulant approach is used to crassify moduration within a subcrass of macro moduration classifier arso known as micro moduration crassifier. For the micro moduration crassifier, we use different position of non-zero cyc*c frequency of intermediate frequency (IF) signal' we have used fourth order cycric cumurant to crassify between pll4-quadrature phase shift keying(PV4.QPSK)andminimumshiftkeying(MSK)whicharefromthecircular constelration. A second order cycric cumulant has been used at baseband level to crassify between QpsK and offset QpsK (oQpsK) which are remaining from the circular consteration. The proposed BMc method is impremented on a National Instrument (NI) software deflned radio and resurts are verified through simulation and testbed measurement, and compared with the existing erementary approach. It has been obserued that the proposed combined method works welr in flat fading channer and is more robust than the elementary cumulant approach' For the simulation and experiment, we have considered a six class problem which includes binary phase shift keying(BPSK),QPSK,oQPSK,PI/4.QPSK,MSKandl6.quadratureamplitude modulation (16-QAM)' 

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