住宅地における端末間干渉電力の時変動モデル

摘要

端末間干渉伝搬評価チャネルモデルの構築に向け，住宅街におけるマイクロ波帯受信レベル変動特性についてこれまでに提案されている住宅街低層伝搬モデルに基づいた検討を行った．始めに，住宅街低層環境において測定を行い，低層環境においても受信レベル変動は伸上ライス分布によって表わされること，受信レベル変動は測定場所によって大きく異なることを明らかにした．また，住宅街低層伝搬モデルに基づき，3つの支配的な経路で構成される受信レベル変動モデルを提案し，各経路のKファクタ推定式を実験的に導出した．最後に提案モデルと得られた推定式を用いて測定値と比較を行い，提案モデルの妥当性を示した．%To establish interference channel model between mobile terminals, characteristics of fading at micro-wave band in residential environment is studied. This characterization is carried out based on existing path loss model in residential environment. First, measurement is carried out in residential environment with low antenna height. And, it is shown that the fading characteristics is represented by Nakagami-Rice fading distribution even in a low antenna height condition. Moreover, it is shown that the fading characteristics is heavily dependent on a measurement environment. Second, based on a path loss model in residential area with low antenna height, time varying model composed by three dominant path is proposed, and the prediction formulae of K factor per dominant path are derived by measurement data. Finally, estimated results using the proposed model and the prediction formulae and measurement results are compared, and validity of proposed model is tested.