鄰近胞元搜尋方法

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

102133428

專利證號

I 507064

專利獲證名稱

鄰近胞元搜尋方法

專利所屬機關 (申請機關)

國立中央大學

獲證日期

2015/11/01

技術說明

在長程演進(long-term evolution/long-term evolution-Advance, LTE/LTE-A)第四代行動通訊系統方案中, 增加了多點協作(coordinated multiple points)與微型蜂胞(femto-cell)的方案, 因此除了主要服務的蜂胞(serving cell)外, 鄰近蜂胞尋找(neighbor cell search)是相當重要的同步動作。 目前文獻上多採用同調(coherent)搜尋演算法來進行鄰近蜂胞尋找, 但是在低訊雜比與高通道估測誤差時, 將招致同調蜂胞搜尋演算法性能劣化, 因此我們提出了非同調(non-coherent)的搜尋演算法搭配部分相關性(partial correlation)檢查, 藉由頻域通道連續性變化的假設來消除通道的影響, 並排除通道估測的必要性, 也發揮主要同步訊號(primary synchronization signal)與次要同步訊號(secondary synchronization signal)的交互相關特性, 可同時檢驗出使用者端相對於不同基地台間可能存在的不同載波頻率誤差, 經由模擬驗證, 在低訊雜比下與高行車速率下, 由於排除了通道估測誤差或估測過時的困擾, 我們所提出的演算法有相當不錯的性能。 A new neighbor cell search algorithm for LTE/LTE-A systems is proposed. To improve the interference problem in channel estimation for coherent detection in the conventional approaches, we propose a non-coherent scheme that takes advantage of the similarity of channel responses at adjacent subcarriers. The proposed neighbor cell search procedure not only includes both PSS and SSS detection, but also can combat different carrier frequency offsets that the home cell signal and the neighbor cell signal may suffer. We convert the neighbor cell PSS and SSS into new sequences for recognition after the removal of the home cell synchronization signals respectively. By examining the cross-correlation properties of the new sequences, we show that partial correlation can well detect the neighbor cell sector ID and group ID. From simulation results, it is also clear that the proposed algorithm has good detection results and outperforms the conventional coherent approaches.

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