naa a22 4500 510794726 CHVBK 20180411083332.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11277-012-0658-7 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0658-7 An Exact Combinatorial Analysis for the Performance Evaluation of Framed Slotted Aloha Systems with Diversity Transmission Over Erasable Wireless Channels [Elektronische Daten] [In-Hang Chung, Ming-Ching Yen] Framed Slotted Aloha (FSA) protocols are widely used in various communication systems. This paper investigates the performance of FSA systems that employ diversity transmission (DT) techniques over erasable wireless channels. Two DT schemes, DT-SWIR and DT-SWOR, differentiated by the underlying channel sampling procedures, i.e., sampling with/without replacement (SWIR/SWOR), are proposed. Modified versions, MDT-SWIR and MDT-SWOR, in which new and backlogged users use different diversity factors are also presented. To further exploit the advantages of using DT, we introduce a new PMDT-SWIR scheme in which the transmitting power of a packet can be varied. Using a probabilistic retransmission model, we develop exact combinatorial analyses to evaluate the throughput and activity factor. Characteristics of all schemes are comprehensively studied through numerical examples. For a dynamically controlled system, the optimal retransmission probabilities that result in maximal throughput for the MDT-SWIR, MDT-SWOR, and PMDT-SWIR are determined. All mathematical analyses are validated via computer simulations. Springer Science+Business Media, LLC., 2012 Activity factor nationallicence Diversity transmission nationallicence Erasable channels nationallicence Framed slotted Aloha nationallicence Sampling with/without replacement nationallicence Chung In-Hang Department of Electrical Engineering, Chung Hua University, No. 707, Sec. 2, WuFu Rd., Hsinchu, Taiwan, ROC aut Yen Ming-Ching College of Engineering, Chung Hua University, No. 707, Sec. 2, WuFu Rd., Hsinchu, Taiwan, ROC aut Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1689-1718 0929-6212 69:4<1689 2013 69 11277 https://doi.org/10.1007/s11277-012-0658-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0658-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chung In-Hang Department of Electrical Engineering, Chung Hua University, No. 707, Sec. 2, WuFu Rd., Hsinchu, Taiwan, ROC aut NATIONALLICENCE 700 1- Yen Ming-Ching College of Engineering, Chung Hua University, No. 707, Sec. 2, WuFu Rd., Hsinchu, Taiwan, ROC aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1689-1718 0929-6212 69:4<1689 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer