Femtocell Networks in Indoor Environments

Femtocell Networks in Indoor Environments

本文研究毫微微蜂巢部署於多輸入多輸出(multiple-input multiple-output, MIMO)系統所引起的通道相關因素，也就是MIMO-femtocell系統。據了解，通道相關性的現象肯定會降低無線通訊的整體性能。此外，我們主張MIMO-femtocell部署的覆蓋區域會下降的原因是因為，在傳輸通道裡通道相關性的發生。文中利用一些推導到的解析性封閉公式，進行對存在於MIMO-femtocell系統中之通道相關現象進行討論。為了克服通道相關的效應，前置編碼之演算法亦於文中進行探討；此外，利用一些數值結果的舉例來驗證說明所推得之結果。值得一提的是，如果考慮通道相關現象在MIMO-femtocell系統中，於基地站(base station, BS)覆蓋區域範圍內，並且以這篇文章之結果和之前發布過的文獻比較，其覆蓋區域範圍大約有3-5倍差異。This study investigates the channel correlation of a multiple-input multiple-output (MIMO) system tiered with a femtocellular network-specifically, a MIMO- femtocell (MIMO- FT) system, Channel correlation degrades the overall system performance of a wireless communication systems. Furthermore, this study argues that the coverage area of a MIMO-FT deployment will be reduced in size by channel correlation occurring in propagation channel. This study utilizes some derived analytical closed-form formulas to discuss the phenomenon of channel correlation occurring in MIMO-FT systems. In addition, an algorithm with precoding is explored for the purpose of mitigating the effects of channel correlation.