A novel multi-packet reception scheme in wireless sensor networks (WSN) based on network-assisted diversity multiple access (NDMA) is proposed

which exploits cooperative diversity to overcome multi-path fading and selects relay nodes according to the characteristics of WSN and full-rank requirements of channel matrix using cross-layer methods.During the slots following the collision

a set of nodes designated as relays will cooperate with source nodes and destination node to form virtual antenna array and retransmit the signals that they received during the collision slot.The proposed scheme can effectively limit retransmission times and achieve higher throughput than slotted ALOHA and other NDMA methods.Simulation results validate the proposed scheme.