다중 성분의 저표본화된 AM, FM 및 AM-FM 신호들의 복조와 성능

Demodulation and Performance of Multicomponent Undersampled AM, FM and AM-FM Signals

  • 발행 : 2000.07.01

초록

We propose an nonlinear demodulation algorithm for undersampled multicomponent AM(Amplitude Modulation), FM(Frequency Modulation) and AM-FM signals. First, we derive respectively undersampling frequency of the AM, FM and AM-FM using undersampling scheme, and separate respectively monocomponent signals from multicomponent signals using periodic algebraic separation algorithm. In this case augmented separation matrix is very regular and sparse, it has a special structure. The proposed demodulation algorithm detects respectively message signals of the IA(Instantaneous Amplitude) and IF(Instantaneous Frequency) from descrete monocomponent AM, FM and AM-FM signals with an undersampling frequency to be controllable. Verifying the RMS(Root Mean Squares) errors of the detected signals, we show that the performance is excellent.

키워드

참고문헌

  1. 손태호, 이민호, '저표본화된 두 성분의 AM-FM 신호들로부터 대수적 분리와 에너지 연산자를 사용한 복조기 설계 및 특성', 대한전기학회지, vol.48A, No.5, pp.643-649, MAY, 1999
  2. B. Santhanam, P. Maragos, 'Demodulation of Discrete Multicomponent AM-FM Signals Using Periodic Algebraic Separation and Energy Demodulation', Proc. IEEE Int. Conf. Acoust. Speech, Signal Process, Vol. III, pp. 2409-2412, 1997 https://doi.org/10.1109/ICASSP.1997.599542
  3. J. F. Kaiser, 'In a Simple Algorithm to Calculate the 'Energy' of a Signal', Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, Albuquerque, NM, pp. 381-384, Apr. 1990 https://doi.org/10.1109/ICASSP.1990.115702
  4. P. Maragos and J. Kaiser, T. F. Quatieri, 'On Amplitude and Frequency Demodulation Using Energy Operators', IEEE Trans. Sig. Proc., Vol. 41, No. 4, pp. 1532-1552, April, 1993 https://doi.org/10.1109/78.212729
  5. 손태호, 박종연, 'Undersampling 기법에 의한 AM 및 FM 신호의 디지털 복조기 설계와 특성', 한국통신학회지, Vol. 22, No. 1, pp. 116-126, Jan. 1997
  6. Mou-yan. Zou and R. Unbehauen, 'An Algebraic Theory for Separation of Periodic Signals', Archiv fur Elektronik und Uebertragungstechnik, vo. 45, pp. 351-358, Nov-Dec 1991
  7. Mou-yan. Zou and Chai Zhenming and R. Unbehauen, 'Separation of Periodic Signals by Using an Algebraic Method', Proc. ISCA91, Vol. 5, pp. 2427-2430, 1991 https://doi.org/10.1109/ISCAS.1991.176066