时隙ALOHA DS/CDMA系统与多载波时隙ALOHA系统吞吐性能的比较研究
Comparison study of throughput performance in slotted aloha DS/CDMA and multicarrier slotted aloha systems
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摘要: 该文对同样带宽下时隙 ALOHA DS/CDMA系统和多载波时隙 ALOHA系统的吞吐量进行了理论计算、比较和仿真。结果表明,在总负载较大时,采用高纠错能力的时隙 ALOHA DS/CDMA系统可以在吞吐量上有更好的性能。但若网络负载过重,时隙ALOHA DS/CDMA系统的吞吐性能较多载波时隙ALOHA的系统下降快;码字总数受限会带来码字选择的冲突,从而降低系统的吞吐性能。Abstract: Throughput performance for Slotted ALOHA DS/CDMA (S-ALOHA-DS/CDMA) and Multicarrier Slotted ALOHA (MC-S-ALOHA) systems is performed and compared in this paper. Theory analysis and computer simulation results of throughput of S-ALOHA-DS/CDMA are obtained using different error correcting code. And comparison results with MC-S-ALOHA system are also obtained. It is proved that with the traffic increasing, the S-ALOHA-DS/CDMA with high error-correct code being used has better throughput performance. In the case of the too heavy traffic, the MC-S-ALOHA system has better throughput performance. If the total codes of the system are limited, the code contention collision will occur so that throughput will drop.
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J.G. Proakis, Digital Communications(3rd edition),北京,电子工业出版社,1998,第13章[2]M.B. Pursley, Performance evaluation for phase-coded spread-spectrum multiple-access communication Part I: System analysis, IEEE Trans. on Comm., 1977, 25(8), 795-799.[3]J. M. Holzman, A simple, accurate method to calculate spread-spectrum multiple-access error probabilities, IEEE Trans. on Comm., 1992, 40(3), 461-464.[4]D. Raychaudhuri, Performance analysis of random access packet-switched code division multiple access systems, IEEE Trans. on Comm., 1981, 29(6), 895-901.[5]孟玉珂,排队论基础及应用,上海,同济大学出版社,1989,第三章. -
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