マルチアンテナ伝送技術の移動通信への適用に関する研究

摘要

In mobile radio communications, it is desired to realize higher spectral efficiency to increase the system capacity, i.e., the number of active users, and the channel capacity, i.e., the transmission rate of users. Recently, multi-antenna transmission technologies, such as Adaptive Array Antenna (AAA) and MIMO (Multi-Input Multi-Output) transmission, have considerable attention due to the high potential of improving the spectral efficiency. In this paper, we propose a downlink weight generation method and a call admission control algorithm to improve the spectral efficiency and clarify their effectiveness by computer simulations for the 3rd generation mobile radio systems employing AAA at the base station. We also propose a simple evaluation method of the spectral efficiency improvement and clarify the validity. Next, we propose a novel signal de-tenction algorithm for separating multiple signals and an efficient multi-user scheduling algorithm in order to improve the spectral efficiency for the next generation mobile radio systems employing MIMO transmission confirming the effectiveness by computer simulations.%移動通信ではユーザ数の増大および更なる伝送の高rn速化が求められている．移動通信は有限の周波数資rn源を利用しており，このような要求に対応するためにrnは，周波数の効率的な利用が不可欠である．これまrnで，周波数利用効率向上技術として，小セル化やセルrnのセクタ化，高効率な誤り訂正の技術等が導入されてrnきた．