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標題: 多用戶多輸入多輸出多載波分碼多重存取系統之通道參數估計與符元偵測
Channel Parameter Estimation and Symbol Detection for Multiuser MIMO MC-CDMA Systems
作者: 周祐任
Chou, You-Ren
關鍵字: 多載波分碼多重存取;MC-CDMA;循環前置碼;多用戶多輸入多輸出;最小均方誤差;近似均方精確係數;CP;PSF;Multiuser;MIMO;MMSE;QMSAC
出版社: 電機工程學系所
引用: [1]. L. Hanzo, M. Munster, B. J. Choi and T. Keller, “OFDM and MC-CDMA for Broadband Multi-User Communications,” WLANs, and Broadcasting, Hoboken, N.J.: J. Wiley, 2003. [2]. Ahmad R.S. Bahai and Burton R. Saltzberg, “Multi-Carrier Digital Communications: Theory and Applications of OFDM,” New York :Kluwer Academic, 1999. [3]. K. Fazel and S. Kaiser, “Multi-Carrier and Spread Spectrum Systems: from OFDM and MC-CDMA to LTE and WiMAX,” Chichester, U.K.: Wiley, 2008. [4]. E. Telatar, “Capacity of the multiple antenna Gaussian channel,” European Transactions on Telecommunications, vol. 10, pp. 585-595, 1999 [5]. Y. S. Cho, J. Kim, W. Y. Yang and C.-G. Kang, “MIMO-OFDM Wireless Communications with MATLAB,” John Wiley & Sons (Asia), 2010 [6]. G. J. Foschini, “Layered space-time architecture for wireless communication in a fading environment when using multi-element antennas,” Bell Labs. Tech. J., vol.1, pp.41-59, 1996 [7]. D. Gesbert, M. Kountouris, R. W. Heath, Jr., C.-B. Chae, and T. Salzer, “Shifting the MIMO Paradigm: From Single User to Multiuser Communications,” IEEE Signal Processing Magazine, vol. 24, no. 5, pp. 36-46, Oct., 2007 [8]. Yi Ma, Rahim Tafazolli, “Estimation of Carrier Frequency Offset for Multicarrier CDMA Uplink,” IEEE Communications, Transactions on Signal Processing, vol. 55, no. 6, pp. 2617-2627, JUNE 2007 [9]. Layla Tadjpour, Shang-Ho Tsai, and C.-C. Jay Kuo, “Simplified Multiaccess Interference Reduction for MC-CDMA With Carrier Frequency Offsets,” IEEE Transactions on Vehicular Technology, vol. 59, no. 5, pp. 2543-2555 JUNE 2010 [10]. F. Bader, S. Zazo, J. M. Paez Borrallo, “Uplink Acquisition of Synchronization Parameters in MC-CDMA Systems,” IEEE Vehicular Technology Conference, vol. 5, pp. 2140-2145, 2000 [11]. Yinzhi Luan, Jiandong L, “New Timing Acquisition Method for MC-CDMA System with Frequency Offset,” IEEE Vehicular Technology Conference, vol. 3, pp. 1477-1481, 2002 [12]. Xiaoyu Hu, Yong Huat Chew, “A Joint Blind Timing and Frequency Offset Estimator for Asynchronous Multicarrier CDMA Systems” IEEE Military Technology Conference, pp. 1-7, 2006 [13]. Chang-Yi Yang, Bor-Sen Chen, “Robust MC-CDMA Channel Tracking for Fast Time-Varying Multipath Fading Channel,” IEEE Transactions on Vehicular Technology, vol. 59, no. 5, pp. 4658-4664 Nov. 2010 [14]. Shun-Te Tseng and James S. Lehnert, “LMSE-Based Parameter Acquisition for Multicarrier CDMA Systems,” IEEE Transactions on Communications, vol. 57, no. 10, pp. 3113-3122, Oct 2009 [15]. Shinsuke Hara, Ramjee Prasad, “Overview of Multicarrier CDMA,” IEEE Communications Magazine, vol. 35, pp. 126-133, Dec 1997 [16]. Shun-Te Tseng and James S. Lehnert, “Windowing for Multicarrier CDMA Systems,” IEEE Transactions on Communications, vol. 57, no. 10, pp. 3154-3163, Oct 2009 [17]. J. G. Proakis, Digital Communications. New York: McGraw Hill, 4th ed., 2000 [18]. R. K. Martin, K. Vanbleu, M. Ding, G. Ysebaert, M. Milosevic, B. L. Evans, M. Moonen, and C. R. Johnson, Jr., “Unification and evaluation of equalization structures and design algorithms for discrete multitone modulation systems,” IEEE Transactions on Signal Process, vol. 53, no. 10, pp. 3880–3894, Oct. 2005 [19]. B. Farhang-Boroujeny, Adaptive Filters Theory and Applications. West Sussex, England: John Wiley & Sons, 1998. [20]. V. Tripathi, A. Mantravadi and V. V. Veeravalli, “Channel acquisition for wideband CDMA signals,” IEEE J. Select. Areas Commun., vol. 18, no. 8, pp. 1483-1494, Aug. 2000. [21]. M. Wax and T. Kailath, “Detection of signals by information theoretic criteria," IEEE Trans. Acoust., Speech, Signal Process., vol. 33, no. 2, pp. 387-392, Apr. 1985.
本篇論文主要是使用多載波分碼多重存取系統(MC-CDMA)作為上行鏈路傳輸技術之基礎,搭配循環前置碼(CP)的應用,再經由脈波塑形濾波器(PSF)傳送至通道中。在接收端所接收到的訊號,因傳送通道受到多重路徑(Multi-path)的影響,產生符元間的干擾,可以藉由循環前置碼解決。搭配多用戶多輸入多輸出(Multiuser MIMO)技術可允許多個用戶共享頻寬的特性,進一步充分利用頻譜資源。在本論文中,我們使用的接收機架構為匹配濾波器(MF)取樣接收訊號,利用最小均方誤差(MMSE)的等化方法去消除用戶間的干擾。在非同步的傳送接收架構下,接收端需要估計系統中的多路徑通道增益係數、載波相位偏移以及傳輸時間延遲等參數。結合多用戶多輸入多輸出系統與多載波分碼多重存取系統,並且估計非同步架構下的各種所需參數。透過利用近似均方精確係數(QMSAC)來輔助估計係數,致力於降低估計參數的複雜度是本篇論文主要的研究方向。接收端所需要知道的資訊只有傳送端的展頻序列。最後,估計出參數之後再透過獲得的參數進行符元偵測。

The mainly idea of this paper is to use multi-carrier code division multiple access (MC-CDMA) with the applications of cyclic prefix (CP) as the basic of the uplink transmission scheme, and then transmit through the pulse shaping filter (PSF) sent to the channel. In receiver, due to the transmission channel subject to multipath, resulting in inter-symbol interference can be solved by cyclic prefix. Multiple input/multiple output (MIMO) techniques allow multiple users to share bandwidth characteristics, it can fully utilize available the spectrum resource. In this paper, we used the matched filter to sample the received signal and the minimum mean square error (MMSE) algorithms to eliminate the interference between users. In the asynchronous architecture, the receiver needs to estimate the parameters of the multi-path gain coefficient, the carrier phase offset and the transmission time delay. We want to combine multiuser MIMO systems and MC-CDMA systems, and estimate the required parameters under asynchronous architecture. The main research in this paper is committed to reduce the complexity of the estimated parameters through the quasi mean square accuracy coefficient. To estimate the parameters, the receiver only needs to know the spreading sequence. In the end, through the parameters we obtained for symbol detection.
其他識別: U0005-0108201200081000
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