Effect of the Transmission Impairments on the Peformance of Packet Radio Network

Packet radio has recently gained great interest in the wider context of mobile communications. In this scenario, the signal worsening due to real transmission conditions (linear and non linear distorsion, fading, interferences, noise) deeply affect the network performance. It is then necessary to verfy whether it is feasible, and if so, how to dimension the transmission system supporting the network itself, in order to respect a fixed quality condition.In this work we suggest the introduction of a quality criterion which seems particularly suitable to set up a relationship between transmission and network parameters, and therefore to solve the problem previously submitted. We determine this relationship with reference to a star topology network, where the slotted Aloha protocolo is employed in cojunction with a narrow band modulation scheme; independent, non-selective and slowly varying fading conditions on every link of the network are also assumed. The treatment developed is then applied to a significant example of packet radio network, and many numerical results are reported.