Throughput optimisation of a stop-and-wait ARQ protocol

A stop-and-wait ARQ protocol is described, in which the modulation operation is strictly integrated into the transmission procedure. The data blocks are sent to the receiver in groups containing a specified number of consecutive copies. The optimum number of transmissions per codeword, which maximises the throughput, is evaluated. The results show that a net improvement can be achieved by using the described algorithm with respect to other similar ARQ schemes. In particular, it is shown that for high error rates this stop-and-wait scheme presents higher throughput than the classical selective protocol