A MAC protocol with RCPT coded hybrid ARQ-II for CDMA networks

A new multiple access protocol that combines the characteristics of hybrid ARQ error control and turbo coding is proposed and investigated. If hybrid ARQ-II with code combining is applied, retransmissions are reduced and frame error rate is lowered when the channel experiences heavy traffic. It is an adaptive optimization of the balance between the CDMA processing gain and FEC coding gain. Simulation shows that using hybrid ARQ-II with code combing in PMCAP/CDMA can improve the delay performance in AWGN channels. Code limitation strategies can decrease the multiple access interference (MAI) level and frame error rate, which in turn improves the system performance when the background noise is very high.