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        TDAS無線室內覆蓋

              MDAS(Multiservice Distributed Access System Solution)是一種對饋入的多制式射頻信號進行數字化處理,并通過光纖傳輸和分布的室內外覆蓋解決方案。     

              TDAS是基于鐵塔規范的光纖分布系統。可支持多家運營商,多制式,多載波,并集成WLAN系統,一步解決語音及數據業務深度覆蓋需求,共享設施、節約投資,極大的提升了移動數據時代最終用戶室內體驗。與傳統模擬分布系統相比,同時具備混合組網、時延補償、自動載波跟蹤、支持多線天技術(MIMO)、上行底噪低、易于施工等特點。TDAS系統分布式、小功率深度精確覆蓋的特點非常適用于大型場館、交通樞紐、購物中心、商務樓宇等場所的室內覆蓋。

              TDAS主要由接入單元(AU,Access Unit)、擴展單元(EU,Extended Unit)、遠端單元(RU,Remote Unit)三部分組成。最大組網能力為:AU:EU:RU=1:32:256。

              AU:通過從基站RRU的天線口耦合射頻信號的方式接入基站信號,并將射頻信號數字化通過光纖傳輸至EU。

              EU:將AU傳輸過來的數字信號分發給RU,同時對RU進行遠程供電。

              RU:將EU傳輸過來的數字信號轉化為射頻信號,送至天線端口對目標區域進行覆蓋。

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