屋外MIMO伝搬特性推定におけるレイトレース法簡易計算手法

摘要

This paper proposes a new method for predicting the propagation characteristics between each transmitting and receiving antenna composing antenna arrays. For the purpose of decreasing the calculation load, the ray-tracing calculation is conducted using the selected transmitting and receiving gravity point for deriving reflected and diffracted points. These derived reflected and diffracted points are shared for the ray-tracing calculation against the all other combinations of transmitting and receiving antenna comprising antenna arrays. The effect of the proposed method is evaluated by comparing between the ray-tracing calculation results using proposed method and precise method for a simple outdoor environment. The effectiveness of the proposed method for predicting the MIMO propagation characteristics for systems using antenna arrays are shown in terms of the differences of the eigenvalue calculated by MIMO correlation matrix between using original precise method and proposed method.%本稿ではレイトレース法をアレーアンテナシステムの伝搬特性推定に適用する場合の計算量削減を目的として，送受信アンテナのアレ一重心の組み合わせについてのみレイトレース法による伝搬特性推定を行い，導出された反射点/回折点および反射角/回折角の経路履歴をすべての送受信アンテナ間の組み合わせで共有する簡易計算手法を提案する．さらに，屋外計算モデルによって簡易計算手法のImaging法との誤差を評価し，MIMO伝搬特性推定へのレイトレース法簡易計算手法の有効性について述べている．