時(shí)隙ALOHA DS/CDMA系統(tǒng)與多載波時(shí)隙ALOHA系統(tǒng)吞吐性能的比較研究
Comparison study of throughput performance in slotted aloha DS/CDMA and multicarrier slotted aloha systems
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摘要: 該文對(duì)同樣帶寬下時(shí)隙 ALOHA DS/CDMA系統(tǒng)和多載波時(shí)隙 ALOHA系統(tǒng)的吞吐量進(jìn)行了理論計(jì)算、比較和仿真。結(jié)果表明,在總負(fù)載較大時(shí),采用高糾錯(cuò)能力的時(shí)隙 ALOHA DS/CDMA系統(tǒng)可以在吞吐量上有更好的性能。但若網(wǎng)絡(luò)負(fù)載過(guò)重,時(shí)隙ALOHA DS/CDMA系統(tǒng)的吞吐性能較多載波時(shí)隙ALOHA的系統(tǒng)下降快;碼字總數(shù)受限會(huì)帶來(lái)碼字選擇的沖突,從而降低系統(tǒng)的吞吐性能。
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關(guān)鍵詞:
- 時(shí)隙ALOHA DS/CDMA; 多載波時(shí)隙 ALOHA; 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. -
J.G. Proakis, Digital Communications(3rd edition),北京,電子工業(yè)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,排隊(duì)論基礎(chǔ)及應(yīng)用,上海,同濟(jì)大學(xué)出版社,1989,第三章. -
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