In this paper, an automatic-repeat-request (ARQ) Go-Back-N (GBN) proto
col with unreliable feedback and time-out mechanism is studied, using
renewal theory. Transmissions on both the forward and the reverse chan
nels are assumed to experience Markovian errors. The exact throughput
of the protocol is evaluated, and simulation results, that confirm the
analysis, are presented, A detailed comparison of the proposed method
and the commonly used transfer function method reveals that the propo
sed approach is simple and potentially more powerful.