Multirate IP traffic transmission in flexible access networks based on optical FFH-CDMA

In this paper, we propose a new IP transmission architecture over optical fast frequency hopping code-division multiple-access (OFFH-CDMA) network capable of supporting multirate transmissions for applications in flexible optical access networks. The proposed network architecture is independent of the spreading code employed and does not require any new optical processing technology. The performance of the proposed network is analyzed under different channel utilization conditions, where the utilization is equally varied for all classes at the same instance to fairly maintain the original designed transmission rate. Furthermore, to evaluate the network performance, we derive new expressions for the decoder bit error rate (BER), total BER, packet error rate (PER), and packet throughput. We analyze the performance of a two-class OFFH-CDMA packet network, where multirate transmissions are achieved via manipulation of the user's code parameters. The analytical results show that high code weight user' classes possess better overall performance. In addition, it is shown that the packet throughput performance of low code weight user' classes is more susceptible to channel utilization variations than a user class with high code weight.