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An upper bound to the capacity of discrete time Gaussian channel with feedback. II

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1 Author(s)
Yanagi, K. ; Fac. of Eng., Yamaguchi Univ., Ube, Japan

We give an upper bound on the finite block length capacity of a discrete time nonstationary Gaussian channel with feedback. With the aid of minimization of a quadratic form, it is proved that the feedback capacity Cn,FB(P) and the nonfeedback capacity Cn(P) satisfy Cn(P)⩽Cn,FB(P)⩽C n(P*) where P* is concretely given

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Information Theory, IEEE Transactions on  (Volume:40 ,  Issue: 2 )