Share This Article:

Amplitude and Phase Analysis Based on Signed Demodulation for AM-FM Signal

Abstract Full-Text HTML Download Download as PDF (Size:267KB) PP. 87-92
DOI: 10.4236/jcc.2014.29012    3,250 Downloads   4,087 Views   Citations

ABSTRACT

This paper proposes a new amplitude and phase demodulation scheme different from the traditional method for AM-FM signals. The traditional amplitude demodulation assumes that the amplitude should be non-negative, and the phase is obtained under the case of non-negative amplitude, which approximates the true amplitude and phase but distorts the true amplitude and phase in some cases. In this paper we assume that the amplitude is signed (zero, positive or negative), and the phase is obtained under the case of signed amplitude by optimization, as is called signed demodulation. The main merit of the signed demodulation lies in the revelation of senseful physi- cal meaning on phase and frequency. Experiments on the real-world data show the efficiency of the method.

Cite this paper

Xu, G. , Wang, X. , Xu, X. and Shao, L. (2014) Amplitude and Phase Analysis Based on Signed Demodulation for AM-FM Signal. Journal of Computer and Communications, 2, 87-92. doi: 10.4236/jcc.2014.29012.

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1] Potamianos, A. and Maragos, P. (1994) A Comparison of the Energy Operator and Hilbert Transform Approaches for Signal and Speech Demodulation. Signal Processing, 37, 95-120. http://dx.doi.org/10.1016/0165-1684(94)90169-4
[2] Maragos, P., Kaiser, J.F. and Quatieri, T.F. (1993) On Amplitude and Frequency Demodulation Using Energy Operators. IEEE Transactions on Signal Processing, 41, 1532-1550. http://dx.doi.org/10.1109/78.212729
[3] Maragos, P., Kaiser, J.F. and Quatieri, T.F. (1993) Energy Separations in Signal Modulations with Application to Speech Analysis. IEEE Transactions on Signal Processing, 41, 3024-3051. http://dx.doi.org/10.1109/78.277799
[4] Gupta, S.C. (1975) Phase-Locked Loops. Proceedings of the IEEE, 63, 291-306. http://dx.doi.org/10.1109/PROC.1975.9735
[5] Lindsey, W.C. and Chie, C.M. (1981) A Survey of Digital Phase-Locked Loops. Proceedings of the IEEE, 410-431.
[6] Hawkes, H.W. (1991) Study of Adjacent and Co-Channel FM Interference. IEE Proceedings I (Communications, Speech and Vision), 138, 319-326.
[7] Xu, G.L., Wang, X.T. and Xu, X.G. (2009) Time-Varying Frequency-Shifting Signal Assisted Empirical Mode Decomposition Method for AM-FM Signals. Mechanical Systems and Signal Processing, 23, 2458-2469. http://dx.doi.org/10.1016/j.ymssp.2009.06.006
[8] Bradley, J.N. and Kirlin, R.L. (1993) Phase-Locked Loop Cancellation of Interfering Tones. IEEE Transactions on Signal Processing, 41, 391-394. http://dx.doi.org/10.1109/TSP.1993.193161
[9] BarNess, Y., Cassara, F.A., Schachter, H. and Difazio, R. (1982) Cross-Coupled Phase-Locked Loop with Closed Loop Amplitude Control. IEEE Transactions on Communications, 32, 195-198.
[10] Sundresh, T.S., Cassara, F.A. and Schachter, H. (1977) Maximum a Posteriori Estimator for Suppression of Interchannel Interference in FM Receiver. IEEE Transactions on Communications, 25, 1480-1485. http://dx.doi.org/10.1109/TCOM.1977.1093782
[11] Lu, S. and Doerschuk, P.C. (1996) Nonlinear Modeling and Processing of Speech Based on Sums of AM-FM Formant Models. IEEE Transactions on Signal Processing, 44, 773-782. http://dx.doi.org/10.1109/78.492530
[12] Kumaresan, R., Sadasiv, A.G., Ramalingam, C.S. and Kaiser, J.F. (1992) Instantaneous Nonlinear Operators for Tracking Multicomponent Signal Parameters. In: Proceedings of 6th SP Workshop on Statistical Signal and Array Processing, 404-407. http://dx.doi.org/10.1109/SSAP.1992.246870
[13] Dimonte, C.L. and Arun, K.S. (1990) Tracking the Frequencies of Superimposed Time-Varying Harmonics. Proceedings of ICASSP, 2, 2539-2542.
[14] Xu, G.L., Wang, X.T., Xu, X.G. and Zhou, L.J. (2012) Improved EMD for the Analysis of FM Signals. Mechanical Systems and Signal Processing, 33, 181-196. http://dx.doi.org/10.1016/j.ymssp.2012.07.003
[15] Xu, G.L., Wang, X.T., Zhou, L.J., Shao, L.M. and Xu, X.G. (2013) Time-Varying Bandpass Filter Based on Assisted Signals for AM-FM Signal Separation: A Revisit. Journal of Signal and Information Processing, 4, 229-242. http://dx.doi.org/10.4236/jsip.2013.43031
[16] Santhanam, B. and Maragos, P. (1996) Energy Demodulation of Two-Component AM-FM Signal Mixtures. IEEE Signal Processing Letters, 3, 294-298. http://dx.doi.org/10.1109/97.542159
[17] Friedlander, B. and Francos, J.M. (1995) Estimation of Amplitude and Phase Parameters of Multicomponent Signals. IEEE Transactions on Signal Processing, 43, 917-926. http://dx.doi.org/10.1109/78.376844
[18] Xu, G.L., Wang, X.T. and Xu, X.G. (2014) Generalized Uncertainty Principles associated with Hilbert Transform. Signal, Image and Video Processing, 8, 279-285. http://dx.doi.org/10.1007/s11760-013-0547-x

  
comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.