單載波分頻多重接取系統之調適性波束合成演算法設計;Adaptive Beamforming Schemes with Insufficient Cyclic Prefix in Sc-Fdma Systems

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Title:	單載波分頻多重接取系統之調適性波束合成演算法設計;Adaptive Beamforming Schemes with Insufficient Cyclic Prefix in Sc-Fdma Systems
Authors:	陳永芳
Contributors:	通訊工程系
Keywords:	研究領域：電信工程
Date:	2011-08-01
Issue Date:	2012-01-17 19:04:48 (UTC+8)
Publisher:	行政院國家科學委員會
Abstract:	在單載波-分頻多重接取技術系統中，如果延伸字串的長度短於通道響應的時間長度時，符際干擾與子載波間干擾問題便會產生，如此一來系統的效能變會降低。這問題在之前我們所發表的一篇論文，以陣列天線的技術可以解決此問題，所提的波束合成演算法為考量有頻率偏移問題及沒有參考訊號所推演出來的盲蔽式波束合成演算法，解決CP 長度不夠的問題。在此計畫執行中，在沒有參考訊號的協助下與具有頻率偏移問題之考量，我們將進一步設計出調適性波束合成演算法。初步模擬結果，在使用者移動環境之下，達到降低運算複雜度之目標且具有不錯的效能。其他需要深入探討的問題，將在此計畫執行時做進一步研究。表 When the duration of the cyclic prefix is shorter than that of the channel impulse response duration in single carrier-frequency division multiple access (SC-FDMA) systems, inter-symbol interference (ISI) and inter-carrier interference (ICI) will degrade the system performance. Previously, this problem was solved by a blind beamforming scheme with considering the effects of carrier frequency offsets (CFOs) based on the eigenanalysis in a batch mode [5]. In this project, adaptive algorithms are proposed to find the beamforming weight vectors without using reference signals. The proposed adaptive algorithms show competitive performance compared to the previous proposed algorithm under the insufficient cyclic prefix (CP), the effects of CFOs, and the co-channel interference scenarios. The simulation results reveal that the proposed adaptive algorithms provide better performance than the previously proposed algorithm in higher mobility environments. The issues for further investigation are discussed. 研究期間：10008 ~ 10107
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Communication Engineering] Research Project

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