本報告已完成了大型與中小型都會區以及郊區環境之寬頻向量無線電空-時通道特性量測與分析。根據量測分析結果，吾人建構了空-時通道實體模型以 及空-時通道實體-統計模型。
第二章說明寬頻向量無線電通道量測系統之特性與操作方式。吾人在台北 市東區、中壢市區、中壢郊區以及新竹郊區進行巨細胞環境下的空-時通道特性 量測，這些區域分別代表了典型的大都會區、中小型都會區以及郊區環境。
第三章吾人根據第二章量測的結果，分析了三種傳播環境的通道特徵，包 括了LOS 與 NLOS 環境之傳播特徵、TOA、AOA、DS、AS 以及 AS 與 DS 的 相關係數比較。發現都會區環境中的主要反射體（dominant reflector）影響以及 街道導引傳播（street-guided propagation）的現象相當顯著，特別在 NLOS 情形 時，這些效應會特別明顯。對於 TOA 與 AOA 機率密度分佈則可以分別使用 One-side exponential decaying function 以及 Truncated Laplacian function 來描述，
對於單純的郊區環境其逼近效果相當良好，但是對複雜的都會區環境則有較大 的誤差，但趨勢已頗為接近。DS 與 AS 則大致與傳播環境複雜度呈現正相關，
即NLOS 情形愈嚴重時，其值會較大，這是由於複雜多重路徑傳播所造成的結 果。
第四章吾人建構空-時通道實體模型(SSPM)，首先將複雜之電波傳播問題 作簡化，把它劃分為垂直剖面以及水平剖面之電波傳播模式，在不同剖面中使 用了射線追跡追蹤計算直接波、反射波以及繞射波，並利用幾何光學理論與均 勻繞射理論計算電波傳播路徑損失值。另外，對於巨細胞環境下有顯著影響的 屋頂楔型物繞射現象，吾人也使用嚴謹的電磁理論加以考量。最後吾人使用量 測結果驗證空-時通道實體模型，結果顯示該模型對巨細胞環境中主要傳播路徑 的預估能力相當良好。
在第五章中，吾人建構與驗證空-時通道實體-統計模型。發現在基地台陣
列天線接收訊號脈衝響應均會呈現群集式多重路徑傳播效應，包括直接波附近 之區域散射體群與遠端反射/繞射體附近之區域散射體群所造成的散射群集效 應。而實體模型僅能預估主要電波傳播路徑，無法預估散射效應，但實體-統計 模型可以彌補此不足。實體-統計模型結合了(a) AS (b) DS 以及統計模型，其中 (a) AS (b) DS 用來預估各個主要傳播路徑，統計模型則用來描述區域及遠端散 射群集效應，因此實體-統計模型得以準確預估 PAS、PDS 以及 AS 與 DS 等空-時通道特徵。
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