Wireless LAN has been rapidly deployed and it is expected that wireless LAN networks will be more densely deployed in near future. In this expected dense deployment of wireless LAN networks, it will be required to introduce new technologies such as cognitive radio to improve spatial frequency utilization efficiency. This paper describes the channel capacity improvement by using adaptive directional antenna in high-density wireless LAN networks as the mutual interference is reduced by directional antenna. The channel capacity is evaluated by computer simulation and is compared with that when omni-directionai antenna is employed.%IEEE802.11系無線LANの急速な普及により、将来、無線LANネットワークは稠密に展開されると予想される。このため、WLANにおいてもコグニティブ無線等の技術を取り入れ、限られた周波数帯域において、空間的な周波数利用効率の向上が求められる。本文では、指向性アンテナの干渉軽減効果に着目し、STAにおけるアンテナ指向性制御によるチャネル容量改善効果を計算機シミュレーションにより評価し、無指向性を用いた場合のチャネル容量との比較を行った。
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