應用分散式通道資訊之時槽式阿囉哈通訊協定之分析

Exploiting Decentralized Channel State Information for Slotted ALOHA

劉啟堂(Chi-Tang Liu)

指導教授 ： 蘇炫榮

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2011年)

https://doi.org/10.6342/NTU.2011.02747

摘要

傳統的時槽式阿羅哈是一種針對碰撞通道而設計的隨機存取通訊協定，而在這篇論文當中，我們考慮跨層式設計，將通道資訊應用在傳統的時槽式阿羅哈通訊協定上，首先我們提出一種單一區域傳輸限制的方法，當通道資訊的大小落在傳輸區域裡面的時候傳輸機率就是1。此方法可以有效的降低多重存取干擾。更進一步我們提出了雙重區域傳輸限制的延伸方法。並且我們可以推導出區域限制以及系統效能的公式。因此便可以找出在甚麼區域限制的時候可以達到系統效能最大值。
經過分析討論後，我們得到的結論是單一區域限制的方法適合在訊號及雜訊加干擾比例小於1的情況，而雙重區域傳輸限制的方法適合在訊號及雜訊加干擾比例大於1的情況。

關鍵字

隨機存取 ； 阿羅哈通訊協定 ； 多封包接收 ； 通道感知

並列摘要

Conventional Slotted ALOHA is a random access protocol designed for collision channels. In this thesis, we consider a cross layer design that exploits decentralized channel state information (D-CSI) for the Medium Access Control (MAC) layer protocol such as slotted ALOHA under the SINR capture model. In view of the inferior performance of the threshold based transmission, we first propose a single-region based channel aware ALOHA strategy that can reduce the multiple access interference (MAI). The system throughput is analyzed and optimized for a wireless network with homogeneous fading. We then propose a two-region extension. Both strategies have a significant gain over other common used protocols.
We conclude that the Single-Region strategy is preferable when the SINR capture ratio is smaller than one and the Two-Region strategy is better when the SINR capture ratio is large than one.

並列關鍵字

random access ALOHA ； Multipacket reception ； channel awareness

參考文獻

Decentralized Channel State Information,” IEEE TRANSACTIONS on SIGNAL

PROCESSING, VOL. 56, NO. 6, pp. 2575-2588, JUNE 2008

[2] Fu-Te Hsu and Hsuan-Jung Su, ”Random Access Game in Fading Channels with Capture:

Equilibria and Braess-like Paradoxes,” IEEE TRANSACTIONS on SIGNAL

[3] R. Knopp and P. A. Humblet, ”Information capacity and power control in single-cell