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題 名 | A Simplified LCMV Algorithm for Implementation to Smart Antenna Systems=可實現於智慧型天線系統之簡式LCMV算則 |
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作 者 | 張赫烜; 趙國建; 劉德清; | 書刊名 | 黃埔學報 |
卷 期 | 38 1999.12[民88.12] |
頁 次 | 頁349-363 |
分類號 | 448.813 |
關鍵詞 | 智慧型天線系統; 適應性算則; Smart antenna systems; LCMV; LC; Adaptive Signal processing; |
語 文 | 英文(English) |
中文摘要 | 設計智慧型天線系統來提昇通信容量及通信品質為新一代無線電通信系統發展之趨勢。LCMV為一真有可實現於智慧型天線系統之適應性算則,但是在應用LCMV算則以求取適應性陣列之權位函數時必需仰賴接收信號之變異矩陣參數。在現實無線電通信非均勻的背景環境下要正確估測接收信號之變異矩陣是有困難的,因此限制了LCMV之實用性。本文提出一個LCMV之簡式算則,它稱之為LC算則,以解決LCMV所遭遇到之難題。我們證明若適當選擇方向規範矩陣那麼LC之功能可和LCMV匹配,因此LC算則更具有可實現之潛力。最後我們並以電腦模擬之結果來比較印證我們的論點。 |
英文摘要 | To meet the greater demand both in quality and quantity of the next generation wireless communication services, the design of smart antenna systems(SAS), which mainly aims at exploring spatial capacity by means of SDMA technique, becomes an unavoidable trend. Among many adaptive algorithms to be implemented to a smart antenna system, the linearly constrained minimum variance(LCMV) criterion for choosing array weighting vector is widely used in both narrowband and broadband beamforming, thus LCMV may be a candidate for implementing to a real smart antenna system. However, we have to estimate the covariance matrix of the received signal before LCMV can be applied. Covariance matrix estimation can be a practical difficulty in a wireless communication scenario. In this paper we propose a simplified LCMV algorithm, cal1ed linear constraint (LC) algorithm, as an alternate. We show that LC can compete with LCMV in performance when the constraint matrix is proper chosen. The LC algorithm may be a better choice for smart antenna system because it is much easier to be implemented as well as LC needs no covariance information. The performance of LCMV and LC is compared via simulation results. |
本系統中英文摘要資訊取自各篇刊載內容。