… arbitrary nonwhite Gaussian channel with or without feedback, using … stationary Gaussian
processes, which we will use heavily for the variational characterization of feedback capacity…

… the feedback capacity of a stationary Gaussian channel can be … the feedback capacity has
been given for the case that the noise is a first-order autoregressive moving-average Gaussian …

… feedback capacity of the stationary nonwhite Gaussian additive noise channel has been
open… Finally we show that the feedback capacity of the MA(1) channel can be achieved by using …

… average capacity of the Gaussian channel with feedback … stationary and stationary Gaussian
noise processes, respectively. We then consider the special case of the stationary Gaussian …

… ) for the new channel S by using2 B(eiθ) = (1−a−1eiθ)/(1−aeiθ)−1,a = √N1/(P1 + … feedback
capacity of the original channel SZ through a two-stage strategy: first transform the channel …

… An outcome of our derivation is a new methodology to show that time-invariant inputs are
sufficient to achieve the feedback capacity even when noise may be non-stationary. An optimal …

… We note that it is a long-standing conjecture that a stationary source achieves the feedback
capacity, and this conjecture is not proved in this paper and is still open. If the optimal Kalman…

… Gaussian channels replaces the standard notion of capacity that may not exist). Tighter upper
bounds on the capacity … Specializing these results to stationary channels, we recover some …

… if in the LHS we replace channel capacity SNR with the feedback capacity … channels we
are considering are channels with memory for which feedback can increase channel capacity, …

… to characterize the capacity Of time-vary- where llyl denotes the determinant of K , so we …
Gaussian noise channels with feedback. with maximizing h(Y"), both with and without feedback. …