{"title":"Modulation Identification Algorithm for Adaptive Demodulator in Software Defined Radios Using Wavelet Transform","authors":"P. Prakasam, M. Madheswaran","volume":35,"journal":"International Journal of Electronics and Communication Engineering","pagesStart":2009,"pagesEnd":2017,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/1602","abstract":"
A generalized Digital Modulation Identification algorithm for adaptive demodulator has been developed and presented in this paper. The algorithm developed is verified using wavelet Transform and histogram computation to identify QPSK and QAM with GMSK and M–ary FSK modulations. It has been found that the histogram peaks simplifies the procedure for identification. The simulated results show that the correct modulation identification is possible to a lower bound of 5 dB and 12 dB for GMSK and QPSK respectively. When SNR is above 5 dB the throughput of the proposed algorithm is more than 97.8%. The receiver operating characteristics (ROC) has been computed to measure the performance of the proposed algorithm and the analysis shows that the probability of detection (Pd) drops rapidly when SNR is 5 dB and probability of false alarm (Pf) is smaller than 0.3. The performance of the proposed algorithm has been compared with existing methods and found it will identify all digital modulation schemes with low SNR.<\/p>\r\n","references":"[1] E. E. Azzouz and A. K. Nandi, \"Automatic Modulation Recognition of\r\nCommunication Signals,\" Kluwer Academic Publishers, 1996.\r\n[2] Enrico Buracchini, CSELT, \"The Software Radio Concept,\" IEEE\r\nCommunication Magazine, vol 38 no 9, pp 138-143, 2000.\r\n[3] Druckmann. I, Plotkim. E.I, Swamy M.N.S., \"Automatic Modulation\r\nType Classification\", Electrical and Computer Engineering, 1998. IEEE\r\nCanadian Conference on, vol. 1, pp. 65-68, 1998.\r\n[4] Lopatka.J, Pedzisa.M., \"Automatic Modulation Classification Using\r\nStatistical Moments and a Fuzzy Classifier\", Signal Processing\r\nProcedings, WCCC-ICSP 2000. 5th International Conference on, vol. 3,\r\npp 1500-1506, 2000.\r\n[5] Callaghan. T.G, Pery. J.L, Tjho. 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