Throughput analysis of CDMA systems using multiuser receivers

Abstract

Throughput bounds are attained for random channel access multichannel code-division multiple-access (CDMA) systems and spread slotted Aloha systems employing multiuser receivers. It is shown that the normalized throughput of these two systems reaches 1.0 exponentially fast in the region r/K 0. The maximum throughput of the random channel access multichannel CDMA systems is found as K-/spl radic/(1-(1/M))KlogK-O(logK), where M is the number of channels in the system. The maximum throughput is reached when the average number of simultaneous users is r/sub m/=K-/spl radic/((1-(1/M))KlogK))+O(/spl radic/(K/logK)). The maximum throughput of the spread slotted Aloha systems is K-/spl radic/(KlogK)-O(log K). The maximum throughput is reached when the packet arrival of Poisson distribution has the arrival rate /spl lambda//sub m/=K-/spl radic/(KlogK)+O(/spl radic/(K/logK)).