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姓名 劉舜芳(Shun-Fang Liu) 查詢紙本館藏 畢業系所 電機工程學系 論文名稱 適用於長程演進行動通訊之非同調鄰近細胞搜尋演算法及硬體設計
(A Non-coherent Neighbor Cell Search Scheme for LTE/LTE-A Systems)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 現今的行動通訊系統中,3GPP LTE/LTE-A獲採行為第四代無線通訊的主要規格之一,主要技術採用正交分頻多工存取調變,並且訊號中攜帶的同步訊號對於高頻選擇性通道有較強的抵抗能力,本論文採用3GPP LTE/LTE-A的訊號規格以及通道參數來進行鄰近細胞搜尋演算法的模擬並實作硬體。
演算法中分為四個部分,在進行和基地台同步前我們必須要先知道基地台的識別碼,識別碼又分為分區細胞索引(sector cell index)跟細胞識別碼組(cell ID group),針對移動中的使用者設備(user equipment)提供換手(handover)前置作業時,勢必會收到原先的服務細胞基地台與前往的鄰近細胞基地台兩種訊號,我們要從這些訊號中得到分區細胞索引與細胞識別碼組來組合成原先服務細胞基地台的識別碼與鄰近細胞基地台的識別碼,提供換手時基地台的最基本資訊,這四個演算法進行順序為偵測服務細胞的主要同步訊號、偵測鄰近細胞的主要同步訊號、偵測服務細胞的次要同步訊號最後是偵測鄰近細胞的次要同步訊號,我們利用片段交互相關(partial correlation)來減少通道之間的相位差異性,並且在偵測鄰近細胞的主要與次要同步訊號時,以消去服務細胞為主要目標的方式,消除干擾以便準確的偵測鄰近細胞。
硬體方面我們建立四套硬體分別處理我們演算法中的四個部分,主要共通的硬體為partial correlation的部分,我們建立一套correlation bank,剩下的即是四套演算法的序列產生和序列運算,務求將硬體降低且同時維持我們演算法的效能。
我們的非同調鄰近細胞搜尋演算法即使在360km/hr的環境下也有良好的表現,與其他方法比較過後,效能仍然突出,並且以維持良好效能的目標下,盡量減少硬體使用資源來實作硬體,足以彰顯本論文的演算法在硬體資源降低時的可靠性。摘要(英) A new neighbor cell search algorithm for LTE/LTE-A systems is presented in this paper. To improve the interference problem in channel estimation for coherent SSS detection in the conventional neighbor cell search 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. The removal of the home cell synchronization signals in our algorithm converts the neighbor cell PSS and SSS into new sequences for recognition, 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 through the new sequences. From simulation results, it is also clear that the proposed algorithm has good detection results and outperforms the conventional coherent approaches.
As to the hardware design, we have the common hardware design, the correlation bank. The correlation bank operates the partial correlation in our four parts of non-coherent neighbor cell algorithm. The remaining part of hardware design is about the sequence generation and sequence verification to determine the result of sector cell index and cell ID group.
It is verified to have satisfying performance under mobility of 360 km/hr. In the end, we compare not only performance but also hardware resources to other method to demonstrate our proposed algorithm: Non-coherent Neighbor Cell Search for LTE/LTE-A system is robust.關鍵字(中) ★ 細胞搜尋
★ 小區搜尋
★ 長程演進無線通訊系統
★ 同步訊號偵測關鍵字(英) ★ Cell search
★ LTE
★ synchronization
★ PSS
★ SSS
★ CFO論文目次 目錄 iii
圖示目錄 v
表格目錄 viii
第一章 緒論 1
1.1 簡介與研究動機 1
1.2 論文組織 3
第二章 正交分頻多工存取調變技術暨3GPP LTE系統介紹 4
2.1 正交分頻多工存取調變技術介紹 4
2.1.1 正交分頻多工調變技術 4
2.1.2 正交分頻多工存取調變技術 7
2.2 3GPP LTE系統介紹 7
2.2.1 下行端參數簡介 8
2.2.2 星座圖映射 10
2.2.3 參考訊號 12
2.2.4 同步訊號 14
第三章 基頻通道模型介紹 20
3.1 多重路徑衰減通道模型 20
3.2 加成性白高斯雜訊 32
3.3 載波頻率偏移 33
第四章 接收端非同調鄰近細胞搜尋演算法 34
4.1 接收端系統介紹 34
4.2 載波頻率偏移偵測 36
4.3 服務細胞基地台偵測 38
4.3.1 基於主要同步訊號的分區細胞索引偵測 38
4.3.2 基於次要同步訊號的細胞識別碼組偵測 39
4.3.3 片段交互相關(partial correlation)的決策 40
4.4 鄰近細胞基地台偵測 41
4.4.1 基於主要同步訊號的分區細胞索引偵測 41
4.4.2 基於次要同步訊號的細胞識別碼組偵測 46
4.5 效能模擬與比較 49
第五章 演算法硬體設計與實現 54
5.1 設計流程 54
5.2 硬體架構設計 55
5.2.1 偵測服務細胞中主要同步訊號的分區細胞索引硬體設計 55
5.2.2 偵測鄰近細胞中主要同步訊號的分區細胞索引硬體設計 58
5.2.3 偵測服務細胞中次要同步訊號的細胞識別碼組硬體設計 60
5.2.4 偵測鄰近細胞中次要同步訊號的細胞識別碼組硬體設計 65
5.2.5 Correlation Bank設計 68
5.3 電路實現結果 71
第六章 結論與未來展望 76
參考文獻 77參考文獻 [1] 3GPP TR 25.814 V7.1.0 (2006-09) (Physical Layer Aspects for Evolved Universal Terrestrial Radio Access (E-UTRA)).
[2] 3GPP TS 36.211 V10.5.0: Evolved Universal Terrestrial Radio Access (E-UTRA) Physical Channels and Modulation, 2012.
[3] C. C. Liao, P. Y. Tsai, and T. D. Chiueh. “Low-Complexity Cell Search Algorithm for Interleaved Concatenation ML-Sequences in 3GPP-LTE Systems.” Wireless Communications Letters, IEEE 1.4 (2012): 280-283.
[4] H. G. Park, I. K. Kim, and Y. S. Kim, “Efficient coherent neighbor cell search for synchronous 3GPP LTE system,” Electronics Letter, Vol. 44, lss. 21, pp. 1267-1268, 2008.
[5] B. Li, G. Sun, and X. Wang, “SSS Detection Scheme for Neighbor Cell Search in 3GPP LTE Systems,” in Proc. IEEE Global Telecommunications Conference, pp. 1-5, Dec. 2011.
[6] A. G. Wassal and A. R. Elsherif, “Efficient implementation of secondary synchronization symbol detection in 3GPP LTE,” in Proc. IEEE International Symposium on Circuits and Systems, pp. 1680–1683, 2011.
[7] P. Y. Tsai and H. W. Chang, “A new cell search scheme in 3GPP long term evolution downlink OFDMA systems,” in Proc. IEEE Conference on Wireless Communications and Signal Processing, pp. 1–5, 2009.
[8] B. Li, G. Sun, and X. Wang, “Efficient SSS Detection for Neighbor Cell Search in 3GPP LTE TDD Systems,” in Proc. IEEE International Conference on Communications, pp. 1-5, June 2011.
[9] Y. Shen, T. Luo and M. Z. Win, “Neighbor Cell Search for LTE Systems,” IEEE Transactions on Wireless Communications, Vol. 11, Iss. 3, pp. 908-919, 2012.
[10] I. Kim, Y. Han, Y. Kim, and S. C. Bang, “Sequence hopping cell search scheme for OFDM cellular systems,” IEEE Transactions on Wireless Communications, vol. 7, no. 5, pp. 1483-1489, May 2008.
[11] M. Tanno, Y. Kishiyama, H. Taoka, N. Miki, K. Higuchi, and M. Sawahashi, “Layered OFDMA Radio Access for IMT-Advanced,” IEEE Vehicular Technology Conference, pp. 1-6, Sept. 2008.
[12] S. Sesia, I. Toufic and M. Baker, “LTE-The UMTS Long Term Evolution; From Theory to Practice,” Wiley, US, pp. 11, 2009.
[13] S. Tanaka, H. Ishii, T. Sao, Y. Lizuka and T. Nakamori, “HSDPA Throughput Performances Using an Experimental HSDPA Transmission System,” NTT DoCoMo Technical Journal, Vol. 6 No.4, pp. 19-27, 2005.
[14] T. D. Chiueh and P. Y. Tsai, OFDM Baseband Receiver Design for Wireless Communications. Wiley, September 2007.指導教授 蔡佩芸(Pei-Yun Tsai) 審核日期 2013-7-31 推文 plurk
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