Backlog performance of some controlled slotted Aloha systems

The backlog performance of the most efficient algorithm used in the controlled slotted Aloha channel is examined by simulation. Some new schemes based on Mikhailov´s algorithm are introduced. The simplest to implement need no traffic estimate and have binary feedback. It is found that such schemes also perform very well, giving an acceptable level of throughput at any load below saturation (1/e).