具多封包接收能力無線網路之媒體存取控制及適應性調變和編碼之聯合最佳化

Abstract

多封包接收(MPR)已被視為一種可有效增加無線網路容量的技術。然而，在結合適應性調變編碼(AMC)的無線通訊網路中，傳統的多封包接收矩陣已無法反應真實的物理層(PHY)特性。若將AMC機制直接加入MPR的環境中，由媒體存取控制(MAC)層所選到的使用者及其相對應的傳輸模式可能非為最佳，這將使得PHY的MPR能力無法完全發揮。在本論文中，吾人提出一跨層式(cross-layer)設計將所選之使用者及其相對應的傳輸模式做一聯合最佳化，使得MAC層在做排程程序時可將PHY的MPR能力完全發揮。模擬結果顯示吾人所提出的方法較其他將AMC機制直接加入MPR環境的次佳方法有著較佳的表現。

Multipacket reception (MPR) has been recognized as an effective technique to enhance the capacity of wireless networks. However, the traditional MPR matrices cannot reflect the channel dynamics in modern wireless communication networks, where adaptive modulation and coding (AMC) mechanisms are adopted to improve the system performance. If AMC mechanisms are directly incorporated into MPR environments, the selected users and the associated transmission modes may not be optimal for the medium access control (MAC) layer to fully exploit the MPR capabilities of the physical layer. In this thesis, we propose a cross-layer design to jointly optimize the user selection and the corresponding modes, which can fully exploit the MPR capabilities when the MAC layer performs the scheduling procedure. Computer simulations show that the proposed method outperforms other suboptimal AMC methods, where AMC is directly incorporated into MPR environments.