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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 吳安宇 | |
dc.contributor.author | Yi-Hsuan Lin | en |
dc.contributor.author | 林怡萱 | zh_TW |
dc.date.accessioned | 2021-06-16T23:26:00Z | - |
dc.date.available | 2014-08-09 | |
dc.date.copyright | 2012-08-09 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-07-31 | |
dc.identifier.citation | [1] 3GPP, TS 36.211, “ Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 9),” Mar. 2010. [Online]. Available: http://www.3gpp.org/ ftp/ Specs/html-info/36211.htm.
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Paulraj, “A Fourth-Generation MIMO-OFDM: Broadband Wireless System: Design, Performance, and Field Trial Results,” IEEE Commun. Mag., vol. 40, no. 9, pp.143−149, Sept. 2002. [20] S. Haykin, Adaptive Filter Theory. (Fourth Edition), Pearson Education Taiwan Ltd, 2008. [21] F. Deprettere, SVD and Signal Processing: Algorithms, Analysis and Applications. Amsterdam: Elsevier Science Publishers, 1988. [22] D. J. Love and R. W. Heath, Jr., “Limited feedback unitary precoding for spatial multiplexing systems,” IEEE Trans. Inf. Theory, vol. 51, no. 8, pp. 2967–2976, Aug. 2005. [23] D. J. Love, R. W. Heath, Jr., V. K. N. Lau, D. Gesbert, B. D. Rao, and M. Andrews, “An overview of limited feedback in wireless communication systems,” IEEE J. Sel. Areas Commun., pp. 1341–1365, Oct. 2008. [24] Z. Bai et al., “On the Physical Layer Performance with Rank Indicator Selection in LTE/LTE-Advanced System,” IEEE Personal, Indoor and Mobile Ratio Communications Workshops, pp. 393–398, Sept. 2010. [25] C. Shannon, “Channels with side information at the transmitter,” IBM J. Res. Develop., vol. 2, no. 4, pp. 289–293, Oct. 1958. [26] C. M. Chen, Y. L. Chen, P. A. Ting, and A. Y. Wu, “Codebook searching apparatus and method thereof,” US Patent 0038433, Feb. 2011. [27] R. F. H. Fischer, Precoding and Signal Shaping for Digital Communications, New York: Wiley, 2002. [28] M. Vu and A. Paulraj, “MIMO Wireless Linear Precoding,” IEEE Signal Process. Mag., vol. 24, no. 5, pp. 86–105, Sep. 2007. [29] 3GPP R1-105011, “Way forward on 8Tx codebook for rel.10 DL MIMO,”August 2010. [30] 3GPP, R1-102583, Huawei et.al., “WF on Rel. 10 feedback” [31] L. Wu et.al., “Codebook Design for LTE-A Downlink System,” IEEE Vehicular Technology Conference (VTC Fall), Sep. 2011. [32] L. Collin, O. Berder, P. Rostaing, and G. Burel, “Optimal minimum distance-based precoder for MIMO spatial multiplexing systems,” IEEE Trans. Signal Process., vol. 52, no. 3, pp. 617–627, Mar. 2004. [33] D. Gesbert, C. V. Rensburg, F. 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Zheng, “The Codebook Design for MIMO Precoding Systems in LTE and LTE-A,” IEEE Wireless Communications Networking and Mobile Computing (WiCOM), Sept. 2010. [41] S. Bellis, W. Marnane, and P. Fish, “Alternative Systolic Array for Non-square-root Cholesky Decomposition,” Computers and Digital Techniques, vol. 144, Mar. 1997 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65121 | - |
dc.description.abstract | LTE與LTE-Advanced系統具有頻譜使用率高、傳送頻帶大以及網絡部署與管理成本低廉等優勢,並採用多輸入多輸出(Multiple-Input Multiple-Output, MIMO)和正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)兩項關鍵技術,可以提供大頻寬、成本低的無線通訊傳輸,為未來第四代行動通訊的主要規範。在MIMO系統中,接收端的天線會接收到每個傳送天線的訊號,天線之間會互相干擾,接收端需要透過複雜的檢測技術來恢復數據。然而,在行動通訊系統的下行傳輸中,由於受限於接收端手機的尺寸與功耗等,各種複雜的檢測技術難以實用,因此會利用預前編碼(Precoding)技術,使傳送端可以預先知道通道狀態資訊(Channel State Information, CSI),再依據通道狀態來調整訊號發射策略,能夠有效抑制多天線之間的干擾,在相同錯誤率的情況下可提升4dB左右的效能,並能簡化接收端手機處理的複雜度。
在行動通訊系統中,通道環境變化較快,一般是採用僅需回傳少量碼字的碼簿(Codebook)機制為預前編碼技術。雖然碼簿機制可以大大節省回傳的資訊量,但是主要問題在於需要搜尋碼簿裡最佳的預前編碼器作為回饋的指標。在碼簿搜尋方面已有多篇論文討論與研究[13][14][22]-[24],但其提出的方法複雜度過高,無法適用於通道快速變化的行動通訊系統,並且實作於手機所需硬體成本過高,因此如何有效率且快速地從碼簿中選出適當的預前編碼矩陣來做預編碼為重要的議題。 針對上述議題,本論文將開發出同時支援LTE與LTE-Advanced雙模低複雜度碼簿搜尋器。我們利用碼簿之間的關聯性與巢狀特性來提出一個低複雜度分群以快速傅利葉轉換(Fast Fourier Transform; FFT)為基準的演算法。根據複雜度分析,本論文提出的方法相對於目前文獻可減少約56%的運算複雜度並且沒有任何系統效能的損失。最後,本論文利用TSMC 90 nm製程來實現出雙模低複雜度碼簿搜尋器,此碼簿搜尋器的面積為2.2 mm2,等效邏輯閘數目為547.6K,操作頻率為125MHz。 | zh_TW |
dc.description.abstract | LTE (Long Term Evolution) and LTE-A (LTE-Advanced) systems are dominant standards in future mobile communication systems. LTE and LTE-A systems utilize multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) technique, which can resist multipath interference and improve the spectrum efficiency. The main concern is the interferences among all transmit and receive antennas. The closed-loop scheme, i.e. precoding, is proved to be about 4dB better performance [28] compared with the open-loop solution, which also reduces the overall power consumption.
Codebook is a useful precoding technique for limited feedback systems because only few bits are required to feedback. Several codebook selection criteria for linear receivers have been proposed in [13][14][22]-[24]; nevertheless, these selection criteria are computationally intensive and most of them are not feasible for aperiodic feedback reporting in LTE and LTE-A systems. On account of the limited processing hardware and feedback delay constraints, low-complexity transceivers with efficient codebook selection scheme should be considered. In this thesis, the low-complexity codebook searching engine is proposed for LTE and LTE-A systems. The properties and mutual correlations of the LTE and LTE-A codebooks are analyzed and then a low-complexity grouping FFT-based codebook searching algorithm is proposed. Since the proposed algorithm is an algorithmic transformation, there is no performance loss. The proposed schemes have significant effect of reducing the number of multiplications by 56%, compared with the low-complexity cofactor scheme [26]. At last, a dual-mode low-complexity codebook searching engine with TSMC 90 nm is implemented. The IP size is 2.2 mm2 and the equivalent gate count is 547.6K. The operating frequency is 125MHz. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T23:26:00Z (GMT). No. of bitstreams: 1 ntu-101-R99943025-1.pdf: 1671104 bytes, checksum: f66e9ac4bdf1489f4b1c7b55457fee53 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | 致謝 i
摘要 iii Abstract v Contents vii List of Figures ix List of Tables xi Chapter 1 Introduction 1 1.1 Overview of Precoding Techniques for LTE/LTE-A Systems 1 1.2 Motivation and Contributions 5 1.3 Thesis Organization 7 Chapter 2 MIMO Precoding Techniques in Closed-loop System 8 2.1 System Model 8 2.2 Introduction to Closed-loop Precoding Techniques 10 2.3 Codebook Design for LTE/LTE-A Systems 12 2.4 Existing Codebook Selection Criteria 18 2.5 Summary 22 Chapter 3 Low-complexity Grouping FFT-based Codebook Searching Algorithm for LTE System 23 3.1 Proposed Codebook Partition Scheme for LTE System 23 3.2 Proposed Algorithm for LTE System 25 3.3 Proposed Further Simplification Codebook Selection Schemes for Square Codebook 31 3.4 Simulation Results 36 3.5 Computational Complexity Analysis 38 3.6 Summary 45 Chapter 4 Extended Double FFT-based Codebook Searching Algorithm for LTE-A System 46 4.1 Proposed Codebook Partition Scheme for LTE-A System 46 4.2 Proposed Algorithm for LTE-A System 48 4.3 Simulation Results 56 4.4 Computational Complexity Analysis 58 4.5 Summary 61 Chapter 5 Architecture Design of the LTE/LTE-A Dual-mode Codebook Searching Engine 62 5.1 System Specification 62 5.2 Dual-mode Hardware Sharing Architecture Design 63 5.3 Architecture Design of Each Function Block 64 5.4 Wordlength Analysis 72 5.5 VLSI Implementation 73 Chapter 6 Conclusions and Future Works 76 6.1 Conclusions 76 6.2 Future Works 76 References 78 | |
dc.language.iso | en | |
dc.title | 適用於LTE與LTE-Advanced系統之雙模低複雜度碼簿搜尋演算法及硬體架構設計 | zh_TW |
dc.title | Dual-Mode Low-Complexity Codebook Searching Algorithm and Architecture Design for LTE/LTE-Advanced Systems | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 曹恆偉,黃穎聰,丁邦安,謝欣霖 | |
dc.subject.keyword | 碼簿,第四代行動通訊, | zh_TW |
dc.subject.keyword | Codebook,LTE,LTE-A, | en |
dc.relation.page | 81 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-07-31 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電子工程學研究所 | zh_TW |
顯示於系所單位: | 電子工程學研究所 |
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