Delay and throughput characteristics of TH, CDMA, TDMA, and hybrids for multipath faded data transmission channels

This work introduces the new concepts of adaptive time hopping and variable frame Code Division (CDMA) Multiple Access, and evaluates by a unified analysis the probabilities of bit and packet errors in multipath fading environment of five Time Division (TDMA), Code Division, and Time Hopping (TH) related multiaccess networks, namely: TDMA, CDMA, CDMA/TDMA, Adaptive CDMA/TH, and variable frame CDMA/TDMA networks. The delay and useful throughputs of the five systems are also evaluated for data and voice traffics. All systems use the same channel power and bandwidth, and support the same traffic. Though implementation issues are not covered, CDMA systems are put at a disadvantage by ignoring such inherent advantages as voice silence utilizations and automatic frequency reuse (compared to cellular-type FDMA networks for example). Not surprisingly, CDMA systems 4 and 5 outperform TDMA systems at low and medium input traffics