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Necessary and sufficient condition for capacity of the discrete time Gaussian channel to be increased by feedback

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1 Author(s)
Yanagi, K. ; Dept. of Math., Yamaguchi Univ., Japan

The problem of whether the capacity of a discrete-time Gaussian channel is increased by feedback or not is considered. It is well known that the capacity of a white Gaussian channel under an average power constraint is not changed by feedback. The necessary condition under which the capacity of a nonwhite Gaussian channel with blockwise white noise is increased by feedback is given

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Information Theory, IEEE Transactions on  (Volume:38 ,  Issue: 6 )