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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 蘇炫榮(Hsuan-Jung Su) | |
| dc.contributor.author | Da-Chen Shen | en |
| dc.contributor.author | 沈達蓁 | zh_TW |
| dc.date.accessioned | 2021-06-16T05:39:03Z | - |
| dc.date.available | 2014-08-17 | |
| dc.date.copyright | 2014-08-17 | |
| dc.date.issued | 2014 | |
| dc.date.submitted | 2014-08-12 | |
| dc.identifier.citation | [1] F. Rusek, D. Persson, B. K. Lau, E. G. Larsson, T. L. Marzetta, O.Edfors, and F. Tufvesson, Scaling up MIMO: opportunities and challenges with very large arrays,' IEEE Signal Process. Mag., vol. 30, pp.40-60, Jan. 2013.
[2] H. Yang and T. L. Marzetta, Performance of conjugate and zero-forcing beamforming in large-scale antenna systems,' IEEE J. Sel. Areas Commun.,vol. 31, no. 2, pp. 172-179, Feb. 2013. [3] H. Q. Ngo, E. G. Larsson, and T. L. Marzetta, 'Massive MU-MIMO downlink TDD systems with linear precoding and downlink pilots,' in Proc. Allerton Conference on Communication, Control, and Computing, Urbana-Champaign, Illinois, Oct. 2013. [4] J. Jose, A. Ashikhmin, P. Whiting, and S. Vishwanath, 'Channel estimation and linear precoding in multiuser multiple-antenna TDD systems,' IEEE Trans. Veh. Technol., vol. 60, no. 5, pp. 2102V2116, Jun. 2011. [5] Sangkyu Park, Chan-Byoung Chae, and Saewoong Bahk,'Before/After precoding massive MIMO systems for cloud radio access networks,' published in Journal of Communication and Networks, vol. 15, no. 4, AUG. 2013 [6] C. Shepard, H. Yu, N. Anand, E. Li, T. Marzetta, R. Yang, and L.Zhong, 'Argos: practical many-antenna base stations,' in Proc. ACM MobiCom, 2012. [7] Tadilo Endeshaw Bogale and Long Bao Le, 'Pilot optimization and channel estimation for multiuser massive MIMO systems,' accepted in CISS 2014 Conference. [8] M. Guillaud, D. Slock, and R. Knopp, 'A practical method for wireless channel reciprocity exploitation through relative calibration,' in Proc., ISSPA 05, Sydney, Australia, 2005. [9] J. Guey and L. D. Larsson, 'Modeling and evaluation of MIMO systems exploiting channel reciprocity in TDD mode,' proceedings of IEEE Vehicular Technology Conference, Sep. 2004. [10] R. Kudo, J. McGeehan, S. M. D. Armour, and M. Mizoguchi, 'CSI estimation method based on random beamforming for massive number of transmit antenna systems,' in Proc., ISWCS, Aug. 2012. [11] R. Kudo , S. M. D. Armour , J. McGeehan and M. Mizoguchi, 'A channel state information feedback method for massive MIMO-OFDM,' Journal of Communications and Networks.2013. [12] Ping-Heng Kuo, H. T. Kung, and Pang-AN Ting, 'Compressive sensing based channel feedback protocols for spatially-correlated massive antenna arrays,' in Proc., IEEE WCNC, Apr. 2012. [13] Jin-Hao Li and Hsuan-Jung Su, 'Opportunistic feedback reduction for multiuser MIMO broadcast channel with orthogonal beamforming,' IEEE TRANSACTIONS on WIRELESS COMMUNICATIONS, accepted for publication. [14] D. J. Love, R. W. Heath, V. K. N. Lau, D. Gesbert, B. D. Rao, and M. Andrews, 'An overview of limited feedback in wireless communication systems,' IEEE J. Select. Areas Commun., vol. 26, pp. 1341V1365, Oct. 2008. [15] K. Schober, R. Wichman and T. Koivisto, 'MIMO adaptive codebook for closely spaced antenna arrays,' in Proc. European Signal Processing Conference (EUSIPCO),2011, pp. 1-5. [16] K. Mukkavilli, A. Sabharwal, E. Erkip, and B. Aazhang, 'On beamforming with nite rate feedback in multiple-antenna systems,' IEEE Trans. Inform. Theory, vol.49,no. 10, pp. 2562-2579, Oct.2003. [17] T. Yoo, N. Jindal, and A. Goldsmith, 'Multi-antenna downlink channels with limited feedback and user selection,' IEEE J.Select.Areas Commun., vol. 25, no. 7, pp. 1478-1491, Sept. 2007 [18] Q. H. Spencer, C. B. Peel, A. L. Swindlehurst,and M. Haardt, 'An introduction to the multi-user MIMO downlink,' IEEE Commun. Mag., vol. 42, no. 10, pp. 60-67, Oct. 2004. [19] Y. Shao and J. Yuan, 'A lower bound to the sum-rate of MIMO broadcast channels with limited-rate feedback,' in Proc. IEEE Int. Conf. Commun. (ICC), May 2008, pp.3674-3678 [20] Lukacs, Eugene; King, Edgar P. A, 'Property of the Normal Distribution,' The Annals of Mathematical Statistics 25 (1954), no. 2, 389{394. [21] S. Ghahramani, 'Fundamentals of probability with stochastic processes,' 3rd ed. Prentice Hall, 2005. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/56634 | - |
| dc.description.abstract | 由於我們必須在有限的頻寬內追求更高的傳輸速度(throughput)以及更穩定的傳輸品質(QoS)，大規模多輸入多輸出(Massive-MIMO)目前被認為是能夠在未來的5G無線通訊系統中達成此目標的關鍵技術。大規模多輸入多輸出是指系統中的基地台擁有數百根天線提供更大的空間多樣性，能夠同時在同頻段服務數十個使用者。但要獲得這些好處，基地台需要取得所有使用者的即時通道資訊(CSI)才能避免使用者間的干擾。
在頻分雙工模式中（FDD)，量測通道資訊(CSI)時，基地台的每根天線都需要先傳送一段已知訊號（pilots)，使用者再將量測結果回報給基地台，這種方法在大規模多輸入多輸出並不適用的，所以目前傾向於在大規模多輸入多輸出系統利用時分雙工模式（TDD)中頻道互惠 (Channel Reciprocity) 的方式來達成通道資訊的取得，如此一來，基地台並不需要傳送已知訊號，基地台只要量測每位使用者所傳送的已知訊號來估計使用者到每根天線的通道資訊(CSI)。 但頻道互惠的成立與否目前還受到相當的質疑，此研究是藉由隨機波束成形（Random beamforming)的通道量測方法，讓大規模多輸入多輸出系統能夠在頻分雙工模式中傳輸。我們也把基地台在挑選使用者的過程（scheduling stage）加入考慮，並且提出一套方法進一步減少使用者的回報量。 | zh_TW |
| dc.description.abstract | The concept of Massive-MIMO is a system where a base station equipped with a large number of antennas, say 100 antennas or more, simultaneously serves several users in the same frequency band. However, to harvest the potential bene ts of Massive-MIMO, the base station must acquire the instantaneous channel state information (CSI) in order to suppress inter-user interference. With frequency division duplexing (FDD), channel estimation becomes much more challenging since radio resources required by common
pilots and feedback both grow linearly with the number of BS antennas. By exploiting channel reciprocity, CSI acquisition at base station is more feasible under time division duplexing (TDD) operation. So, time division duplexing is more preferable in Massive-MIMO systems. Nonetheless, the assumption of channel reciprocity in TDD might not be practical. In our work, we utilize the random beamforming CSI estimation method in order to make Massive-MIMO system work for FDD operation. Then, we take the scheduling mechanism into consideration and propose a novel scheme to reduce the feedback load at scheduling stage. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T05:39:03Z (GMT). No. of bitstreams: 1 ntu-103-R01942065-1.pdf: 2181282 bytes, checksum: 8004cc236c2bebbae9cb836c6ff8a693 (MD5) Previous issue date: 2014 | en |
| dc.description.tableofcontents | 1 Introduction 1
1.1 Background . . . . . . . . . . . . . . . 1 1.2 Previous Work and Motivation . .. . . . . 5 1.3 Thesis Organization . . . . . . . . . . . 8 1.4 Notations . . . . . . . . . . . . . . . . 9 2 System Model and Problem Formulation 10 2.1 System Model . . . . . . . . . . . . . . .10 2.1.1 Random Beamforming CSI Estimation . 11 2.1.2 Finite Rate Feedback for CDI Quantization . 14 2.1.3 CSI Estimation Weight Design . . .. 16 2.1.4 Data Transmission Weight Design . . 18 2.2 Problem Formulation . . . . . . . . . . . 22 2.2.1 User Selection Algorithm . . . . . 23 2.2.2 The Properties of the SUS Alogorithm 25 3 Opportunistic Feedback Reduction at Scheduling Stage 30 3.1 CQI Distribution . . . . . . . . . . . . . 31 3.2 Derivation of Multiple Thresholds . . . . 35 3.3 Sum Rate Loss Analysis and Minimum Number of Regions40 4 Numerical Results 43 5 Conclusion 46 | |
| dc.language.iso | zh-TW | |
| dc.subject | 多輸入多輸出 | zh_TW |
| dc.subject | 大規模多輸入多輸出 | zh_TW |
| dc.subject | 多用戶多輸入多輸出 | zh_TW |
| dc.subject | 通道狀態信息 | zh_TW |
| dc.subject | 通道品質指標 | zh_TW |
| dc.subject | 通道方向信息 | zh_TW |
| dc.subject | 隨機波束成形 | zh_TW |
| dc.subject | 通道量測 | zh_TW |
| dc.subject | 部分正交之使用者選擇 | zh_TW |
| dc.subject | Random Beamforming | en |
| dc.subject | MIMO | en |
| dc.subject | Massive-MIMO | en |
| dc.subject | MU-MIMO | en |
| dc.subject | CSI | en |
| dc.subject | CQI | en |
| dc.subject | CDI | en |
| dc.subject | CSI Estimation | en |
| dc.subject | SUS | en |
| dc.title | 在大規模多輸入多輸出下行傳輸中減少通道資訊回饋之技術 | zh_TW |
| dc.title | Channel Feedback Load Reduction at Scheduling Stage in Massive-MIMO Downlink Transmission | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 102-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 蘇柏青(Borching Su),林士駿(Shih-Chun Lin) | |
| dc.subject.keyword | 多輸入多輸出,大規模多輸入多輸出,多用戶多輸入多輸出,通道狀態信息,通道品質指標,通道方向信息,隨機波束成形,通道量測,部分正交之使用者選擇, | zh_TW |
| dc.subject.keyword | MIMO,Massive-MIMO,MU-MIMO,CSI,CQI,CDI,Random Beamforming,CSI Estimation,SUS, | en |
| dc.relation.page | 50 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2014-08-12 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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| ntu-103-1.pdf 未授權公開取用 | 2.13 MB | Adobe PDF |
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