• 作者： 溫志宏; 黃國鼎; 陳怡秀; 溫志超
• 作者服務機構： 國立中正大學電機工程研究所; 吳鳳工商專科學校電機工程科; 中原大學土木工程學系
• 中文摘要： 本文裡，探討了人為之隨機功率分配及自然存在之瑞雷衰退、遠近效應等對槽式ALOHA系統性能之整合影響，系統分析係假設在具有限用戶數的單一蜂巢系統下進行，我們使用了一個馬可夫模式，成功地推導出不同狀況下之捕獲機率，並進而獲得系統輸出量及延遲。本文所使用的捕獲模式是當多個信號碰撞在一起時，若最強的信號之功率與次強信號之功率比大於捕獲比值ρ，則該最強信號即可成功地被接收。根據數值結果顯示，結合人為及自然現象的捕獲效應可大大地提昇槽式ALOHA系統之性能。
• 英文摘要： In this paper, the combined impact of random power assignment, Rayleigh fading, and the near/far effect on the performance of the slotted ALOHA system is studied. Performance analysis is basedon a single-cell system with a finite population. Using a Markov model, the system throughput and delayare successfully derived via a capture probability. The type of signal capture considered is one wherea signal involved in a collision survives if the power level is the strongest one and the ratio of its powerlevel to that of the next strongest packet is greater than the capture ratio ρ. Numerical results indicatethat maximum throughput has been noticeably improved when compared to the conventional slotted ALOHAsystem without the capture effect.
• 中文關鍵字： random power assignment; rayleigh fading; near/far effect; slotted ALOHA; capture effect
• 英文關鍵字： --