標題: 用於扇形分割無線分碼多工通訊系統之波束空-時二維耙狀接收器
A Beamspace-time 2-D RAKE Receiver for Sectored Wireless CDMA Systems
作者: 陳俊宏
Chun-Hong Chen
李大嵩 
Dr. Ta-Sung Lee
電信工程研究所
關鍵字: 波束空間;二維耙狀接收器;beamspace;2-D RAKE receiver
公開日期: 1998
摘要: 在本論文中,吾人提出一種用於扇形分割無線分碼多工通訊環境之波束空□時二維耙狀接收器,用以壓抑共通道干擾與使用多路徑分集技術。此接收器分為兩階段處理,首先,利用陣列天線建構出一組適應性波束涵蓋空間中一特定之扇形區,此作法可壓抑在扇形區域外的共通道干擾,並且有效接收在區域內的多路徑訊號。而且,在扇形區藉由選取少量的波束,可大幅降低空□時聯合處理的維度,進而降低接收器的複雜度。經由使用修正的廣義旁波瓣消除器,可以避免多路徑訊號的相互消除效應。其次,在波束後面利用波束空□時聯合處理以建立基於廣義旁波瓣消除器的新型耙狀匹配接收器,進而對抗扇形區域內的共通道干擾以及有效地合併接收多路徑訊號。吾人所提出的二維耙狀接收器可以用於盲蔽化適應性處理,其祇需要使用者的展頻碼、時序以及粗略估計的方向角。最後,吾人將以電腦模擬之結果來驗證所提出的二維耙狀接收器。
In the thesis, a blind beamspace-time (BT) 2-D RAKE receiver is proposed for multiple access interference (MAI) suppression and multipath diversity in a sectored wireless CDMA communication environment. The scheme involves two stages. Firstly, a set of adaptive beamformers encompassing a prescribed sector is constructed on an antenna array, each providing effective suppression of out-of-sector MAI and reception of in-sector desired signals. By selecting a few beams in the sector, the dimension of the space-time data is greatly reduced and this help to lower the complexity of the receiver. Also, using a modified generalized sidelobe canceller (GSC) scheme, the
desired signal cancellation phenomenon can be avoided. Secondly, a novel extended RAKE matched filter is performed to combat in-sector MAI and combine the multipath components of the desired signal with a BT joint processor operating on the output from the set of beamformers. The proposed 2-D RAKE receiver can be implemented in a blind adaptive mode, and the only information required is the desired signal's signature, timing and a rough estimate of angle of arrival (AOA).
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT870435062
http://hdl.handle.net/11536/64522
顯示於類別:畢業論文