| The Automatic-Repeat-reQuest (ARQ) is a basic technique developed to control and fix errors in today's transmission systems. There are three commonly used specific instances: the Stop-and-Wait (SW), the Go-Back-N (GBN) and the Selective-Repeat (SR) protocols. The time invariant channel model and the discrete time Markov channel model are two channel models used to approach the physical channels. In the time invariant channel model, a dynamic scheduling scheme is applied to improve the performances of the ARQ protocol system. In this thesis, the performances of the Stop-and-Wait, the Go-Back-N and the Selective-Repeat ARQ protocols with the above mentioned two channel models are studied. The impact of the number of channels, the average of the error rates and the difference of the error rates on the time invariant channel model with the three ARQ protocol systems are studied. The impact of the number of channels, the average of the error rates, the difference of the error rates, the number of states and the transition interval on the Markov channel model with three ARQ protocol systems are studied. Comparisons of the two channel models are presented. Finally, the possibility and techniques for applying the dynamic scheduling in a Markov channel model system are investigated. |
