ALOHA with collision resolution (ALOHA-CR): theory and software defined radio implementation

A cross-layer scheme, namely ALOHA With Collision Resolution (ALOHA-CR), is proposed for high throughput wireless communications in a cellular scenario. Transmission occurs in a time-slotted ALOHA-type fashion with a caveat: simultaneous transmissions of two users can be successful. The wireless channel is assumed to be flat fading and constant over the duration of one time slot. A user i with a non-empty queue transmits a packet with some probability p in the beginning of each time slot, after waiting for a random time interval i. If more than two users transmit in the same slot, the collision cannot be resolved, the packets are discarded and the users are asked to retransmit at a later time. If only one user transmits, the transmitted packet is recovered with some probability, depending on the state of the channel. If two users transmit, the collision can be separated and the packets recovered by first oversampling the collision signal and then exploiting independent information abo...

• Type: Journal
• Year: 2010
• Where: TSP
• Authors: Xin Liu, John Kountouriotis, Athina P. Petropulu, Kapil R. Dandekar
• Keywords: Artificial Intelligence, Backlog Assumption, Collision, Infinite Backlog Assumption, TSP 2010