Random coding bounds for correlated parallel channels with unidirectionally cooperating decoders

We propose a maximum likelihood decoding scheme with decoder´s partial cooperation, in which only unidirectional information passing is possible, for correlated parallel channels. We derive a bound on the probability of decoding error for the proposed scheme with a coset code ensemble by using randomized technique. From the property of the derived error exponent, we show a condition that the scheme achieves the capacity region. We compare the proposed scheme with other possible scheme with decoder´s unidirectional cooperation.