TAN Lihui, ZHANG Zhigang. Applications of the Backward Shift Invariant Subspace to Circular Analytic Signals[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2013,52(3):63-66.
TAN Lihui, ZHANG Zhigang. Applications of the Backward Shift Invariant Subspace to Circular Analytic Signals[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2013,52(3):63-66.DOI:
By use of the backward shift invariant subspace,a necessary and sufficient condition under which a product of a circular analytic signal and a conjugate circular analytic signal is still circular analytic is presented. Particularly
if the Ztransform of the circular analytic signal is holomorphic across the unit circle
the conjugate circular analytic signal is a rational function whose poles are the zeros of the Ztransform of the circular analytic signal. As applications of the above results
the conditions under which two circular analytic signals with length n Fourier series have the same amplitude are discussed.