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We study the reliability of sequential codes in a twostate Markov fading AWGN channel under the assumption of noiseless feedback and an average power constraint. We present a capacity achieving scheme with a doubly exponential anytime reliability function with respect to delay for every bit. The scheme is represented by a hybrid control system at the encoder in which the discrete system dynamics evolves based only on the channel state information while the continuous part of the state at thedoi:10.1109/isit.2005.1523652 dblp:conf/isit/SahaiAM05 fatcat:rpjkvzsxa5cknozfzkrmuxwoey