PERFORMANCE ANALYSIS OF A FULLY-CONNECTED, FULL-DUPLEX CDMA ALOHA NETWORK WITH CHANNEL SENSING AND COLLISION DETECTION

In cases where machines having bursty data are equally likely to trans mit to one another, code-division multiple-access (CDMA) ALOHA which a llows for an individual ''virtual channel'' for each receiving station may be a better multiple-access protocol than simple ALOHA. With the use of ''receiver-based code'' multiple-access protocol, it is also po ssible for a station to listen to the channel of the intended receiver before transmission, and also abort transmission when it detects othe rs transmitting on the same channel, This paper describes a model for a fully-connected, full duplex, and slotted CDMA ALOHA network where c hannel sensing and collision detection are used, The model is analyzed using a discrete time Markov chain and some numerical results are pre sented, For a system with a large number of users, where Markov analys is is impractical, equilibrium point analysis is used to predict the s tability of the system, and estimate the throughput as well as the del ay performance of the system when it is stable, Finally, a comparison is made with a simple channel sense multiple-access with collision det ection (CSMA-CD) network, showing that a substantial improvement in th e performance is achieved by the proposed network.