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http://dx.doi.org/10.3837/tiis.2010.08.004

Performance Analysis of Large CDMA Random Access Systems with Retransmission Diversity over Fading Channels  

Yu, Kai (Institute of Mobile Communications, Southwest Jiaotong University Chengdu)
Sun, Yi (Department of Electrical Engineering, City College of City University of New York)
Fan, Pingzhi (Institute of Mobile Communications, Southwest Jiaotong University Chengdu)
Lei, Xianfu (Institute of Mobile Communications, Southwest Jiaotong University Chengdu)
Shu, Lei (Nishio Lab., Department of Multimedia Engineering, Graduate School of Information Science and Technology, Osaka University)
Publication Information
KSII Transactions on Internet and Information Systems (TIIS) / v.4, no.4, 2010 , pp. 509-528 More about this Journal
Abstract
The random access systems, with retransmission diversity (RD) employment, over large random spreading code division multiple access (CDMA) channel subject to fading is investigated, under the assumption of infinite number of users and infinite spreading gain with their ratio converging to a constant. The low bound of the signal to interference and noise ratio (SINR) is shown to converge almost surely to a constant. The throughput, spectrum efficiency and energy efficiency in the dominating systems are obtained. The analytical results are confirmed by simulations. We find that in high traffic loads the throughput with fading is higher than that without. When the energy efficiency increases, the spectrum efficiency tends to two contrary values due to SNR increases or decreases. For the ordinary stable systems, the stability region is shown to shrink as the traffic increases and enlarge with RD employment.
Keywords
Code division multiple access (CDMA); random access; random spreading; fading channel; retransmission diversity;
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