Packet delivery through difficult wireless channel

An algorithm is proposed for user terminals to overcome time uncertainty and power uncertainty, and to achieve successful access to the network through the slotted ALOHA contention channel in broadband wireless and satellite communication networks. For security reasons, the network feedback does not contain user identification information. Each user terminal has to figure out whether its packet is successfully received. It is shown that packets can be successfully delivered within a reasonably small delay by employing the proposed multiple access algorithm.