Title:         Cooperative Diversity in Slotted ALOHA
Abstract:  
Cooperative diversity techniques have recently seen renewed interest
as a way to improve the performance in wireless communication
systems and especially ad hoc networks. Recent work has focused on
the information-theoretic implications of various physical-layer
strategies. Here we propose a cooperative diversity
technique for ad hoc networks based on the decode-and-forward
relaying strategy. We develop a modified MAC protocol based on
slotted ALOHA that allows relay nodes to forward a packet toward its
final destination when the transmission to the intended recipient
fails. The proposed technique provides additional robustness against
fading and collisions. Other proposed cooperative diversity scheme will
also be discussed.