Multicell S-ALOHA DS-CDMA networks with Fast Power Control Error under Frequency-selective Nakagami Fading

In this paper, we have investigated the performance of a multicell S-ALOHA DSCDMA system with fast power control error on a Nakagami frequency selective environment. We analyzed how the throughput of the optimally stabilized system is affected by the channel conditions and some key system characteristics such as the processing gain or the number of fingers in the RAKE receiver. By using an ideal retransmission probability that takes into account not only the number of users in backlog but also the DS-CDMA channel conditions we obtain the maximal achievable throughput of a S-ALOHA DS-CDMA system for a given DS-CDMA channel. These curves can be used as an upperbound for currently used S-ALOHA DS-CDMA systems. The results obtained reflect that, if fast power control is used, the system throughput is very robust against varying channel conditions provided that the processing gain and the EbN0 are above some threshold values.