THROUGHPUT ANALYSIS OF ARQ SCHEMES USING STATE TRANSITION DIAGRAMS

Abstract

Automatic-Repeat-Request (ARQ) schemes have been widely used and various methods and repre- sentations have been used in their analysis. In this paper, the schemes are represented by z- transform based transition diagrams to yield easily retractable expressions. The approach has en- abled the analysis of the Selective Repeat-Stutter 2 (SR-ST2) scheme having variable selective repeat mode retransmissions and the Selective Repeat-Stutter-Go Back N (SR-ST-GBN) scheme having variable stutter mode retransmissions. Using the SR-ST-GBN scheme, it is also shown that it is pos- sible to choose the design parameters of ARQ-based communication systems in order to achieve maximum throughput.