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標題: DVB-T2系統之通道估計處理的改進
On the improvement of channel estimation in DVB-T2 systems
作者: Fu-Yuan Hsiao
關鍵字: OFDM;DVB-T2;pilot-aided channel estimation;least-square estimation interpolation;regularized least-square;temporal correlation;正交分頻多工系統 (OFDM);DVB-T2系統;引領訊號通道估計;LS估計法;內插;regularized LS估計法;時間相關性
引用: [1] L. Fu, S. Sun, X. Jing and H. Huang, “Analysis of Pilot Patterns and Channel Estimation for DVB-T2,” Proceedings of IC-NIDC2010. [2] S. Zettas, Pavlos, I. Lazaridis, Z. Zaharis, S. Kasampalis, and J Cosmas, “A pilot aided averaging channel estimator for DVB-T2,” Proceedings of IS-BMSB 2013. [3] Mingchao Yu and P. Sadeghi, “A study of pilot-assisted OFDM channel estimation methods with improvements for DVB-T2,” IEEE Trans. Veh. Technol., vol. 61, no. 5, pp. 2400–2405, Jun. 2012. [4] J. Lin, “Least-squares channel estimation for mobile OFDM communication on time-varying frequency-selective fading channels,” IEEE Trans. Veh. Technol., vol. 57, no. 6, pp. 3538–3550, Nov. 2008. [5] B. Yang, K. Letaief, R. Cheng, and Z. Cao, “Windowed DFT based pilot-symbol-aided channel estimation for OFDM systems in multipath fading channels,” in Proc. 51st IEEE Veh. Technol. Conf., May 2000, pp. 1480–1484. [6] O. Edfors, M. Sandell, J.-J. van de Beek, S. Wilson, and P. Borjesson, “OFDM channel estimation by singular value decomposition,” IEEE Trans. Commun., vol. 46, no. 7, pp. 931–939, Jul. 1998. [7] ALI H. SAYED, “adaptive filter” [8] L. Vangelista and M. Rotoloni, “On the analysis of P1 symbol performance for DVB-T2,” in Proc. IEEE Sarnoff Symp., Apr. 2009, pp. 1–5. [9] DVB Document A133 Implementation guidelines for a second generation digital terrestrial television broadcasting system (DVB-T2), Jun. 2010. [10] Digital Video Broadcasting (DVB). Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2) [11] M. Hsieh and C. Wei, “Channel estimation for OFDM systems based on comb-type pilot arrangement in frequency selective fading channels,” IEEE Trans. Consum. Electron., vol. 44, no. 1, pp. 217–225, Feb. 1998 [12] S. Coleri, M. Ergen, and A. Bahai, “Channel estimation techniques based on pilot arrangement in OFDM systems,” IEEE Trans. Broadcast., vol. 48, no. 3, pp. 223–229, Sep. 2002. [13] S. Tomasin and M. Butussi, “Analysis of interpolated channel estimation for mobile OFDM systems,” IEEE Trans. Communications, vol. 58, no.5, pp. 1578–1588, May 2010. [14] F. Salman, J. Cosmas, and Yue Zhang, “Modelling and performance of a DVB-T2 channel estimator and equaliser for different pilot patterns,” in Proc. 2012 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB), Jun. 2012, pp. 1–6. [15] “DVB-T2 standard,” ETSI EN 302 755 V1.3.1
在OFDM系統中,通道估計的準確度影響了整體系統的效能。DVB-T2系統採用了OFDM傳輸技術,其通道估計處理是利用傳送端插入已知的引領訊號(pilot symbol), 使得接收端得以利用接收訊號與傳送訊號之間的關係來估計通道。越多的pilot,可以得到較好的估計表現。在DVB-T2系統中定義了八種不同的pilot patterns可用於不同的傳輸環境來估計通道。然而,pilot pattern 5(PP5)之後的四種pilot patterns因為pilot量比較少將會影響通道估計準確度。在本篇論文中,我們提出利用通道時間相關性的Regularized Least-Square 估計法,使用已知的引領訊號的資訊以及最新的通道結果來更新通道。實驗結果顯示,我們提出的方法在pilot量少時可以得到好的估計準確度。

In OFDM systems, the accuracy of channel estimation will affect the overall system performance, DVB-T2 is the OFDM based systems, it uses the relation between known transmitted pilot and received pilot to estimate channel. More pilot enables us to get more accurate channel estimation. There are 8 pilot patterns defined in DVB-T2 systems to apply on different transmission environment. But pilot pattern 5(PP5) and later pilot patterns will get less accurate channel estimation value because there are less number of pilot. In this paper, a temporal correlation based Regularized Least-Square is proposed, this method uses known pilot and latest channel estimation value to update channel. Simulation results shows our proposed can get accurate channel estimation value despite in less pilot scenario.
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