Throughput improvement of a dual-class multi-code CDMA ALOHA system with modified channel load sensing protocol

Abstract

In this paper, we propose a CDMA slotted-ALOHA (CDMA S-ALOHA) system with low-bit rate and high-bit-rate classes of data users applying the multi code CDMA (MC-CDMA) scheme. Performance evaluation is obtained in the respect of the throughput. Contrary to one might expect, we show that the throughput of the class with higher bit rate can be improved by the MC-CDMA scheme. Moreover, we show that applying the modified channel load sensing protocol (MCLSP) to the system gives further improvement in the throughput of the higher bit rate class, as well as to the total throughput of the channel.