博碩士論文 100523036 完整後設資料紀錄

DC 欄位 語言
DC.contributor通訊工程學系zh_TW
DC.creator賴群嵐zh_TW
DC.creatorChun-lan Laien_US
dc.date.accessioned2013-7-23T07:39:07Z
dc.date.available2013-7-23T07:39:07Z
dc.date.issued2013
dc.identifier.urihttp://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=100523036
dc.contributor.department通訊工程學系zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstract長期演進技術(Long Term Evolution,LTE)為第四代行動通訊重要技術之一,此技術之下行鏈路為正交分頻多重存取(Orthogonal Frequency Division Multiple Access,OFDMA)系統,而它是以正交分頻多工(Orthogonal Frequency Division Multiplexing,OFDM)演進而來。OFDM技術可使頻譜效益增加,但它對於都卜勒效應頻率偏移相當敏感,因此OFDMA技術如同OFDM技術,將須解決因通道環境下,進而引起子載波間正交性遭到破壞以及載波間互相干擾(Inter-Carrier- Interference,ICI)的相關問題。 此篇論文將利用可程式化邏輯閘陣列(Field-programmable gate array,FPGA)板實現,以LTE下行鏈路規格下所提出的兩種通道估測方法。其中,我們使資料直接決策(Decision Directed)與多項式模型(Polynomial Model Based)估測法來提升頻域方向通道估測的準確度,且透過模擬來說明通道估測之性能改善。zh_TW
dc.description.abstractLTE (Long Term Evolution) is important for fourth generation of mobile communication technologies. On the downlink transmission, the LTE system uses OFDMA (Orthogonal Frequency Division Multiple Access) technology, which is based on OFDM (Orthogonal Frequency Division Multiplexing). It increases spectrum efficiency, but it is sensitive to Doppler spread and frequency offset. Therefore, the problem that we want deal with is the one operating in time-varying environments where the orthogonality among the subcarriers is destroyed and inter-carrier interference (ICI) is thus created. In this thesis, we conduct design and implementation of channel estimation with FPGA (Field-programmable Gate Array). We propose two channel estimation ways. One of the improved methods is data-aided and decision-directed polynomial model based estimation by frequency domain. The performance improvement is demonstrated through matlab simulations.en_US
DC.subject長期演進技術zh_TW
DC.subject可程式化邏輯閘陣列zh_TW
DC.subject正交分頻多重存取zh_TW
DC.subjectLTEen_US
DC.subjectFPGAen_US
DC.subjectOFDMAen_US
DC.title時變通道環境下LTE下形鏈路系統通道估測之FPGA實現zh_TW
dc.language.isozh-TWzh-TW
DC.titleDesign and Implementation of Channel Estimation for LTE Downlink System in Time-Varying Channel Environment with FPGAen_US
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

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