This work considers the Gaussian channel with noiseless feedback and an average block or symbol energy constraint. For first-order Markov noise, the optimal form of the output power spectrum for the average symbol energy constraint is derived. A simple coding scheme is presented whose output power spectrum has the optimal form.
Michael Christoph Gastpar, Sung Hoon Lim, Adriano Pastore, Chen Feng
Nicolas Macris, Jean François Emmanuel Barbier, Mohamad Baker Dia