Throughput performance analysis of multirate, multiclass S-ALOHA OFFH-CDMA packet networks

In this paper, we propose a new throughput expression for multirate, multiclass slotted-ALOHA optical fast frequency hopping code-division multiple-access (OFFH-CDMA) packet networks considering a Poisson distribution for packet composite arrivals. We analyze the packet throughput performance of a three-class OFFH-CDMA network, where multirate transmissions are achieved via manipulation of the user´s code parameters. It is shown that users transmitting at low rates interfere considerably in the performance of high rate users. Finally, we perform a validation procedure to demonstrate that the proposed multirate throughput expression converges towards the single rate expression (considered as the network limiting case).