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標題: 在OFDM系統下快速衰落通道的兩階段通道估計方法
Two-Step Channel Estimation Scheme for OFDM Systems over Fast Fading Channels
作者: 翁浩耿
Weng, Hao-Geng
關鍵字: 通道估計;channel estimation;決策回授之通道估計;DDCE
出版社: 電機工程學系所
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Lee, “ Channel estimation with power-controlled pilot symbols and decision-directed reference symbols,” in Proc. IEEE Vehic. Tech. Conf. (VTC), 2003, pp.1268 - 1272. [15] S. Balasubramanian, B. B. Farhang, and V. J. Mathews, “ Pilot embedding for channel estimation and tracking in OFDM systems,” in Proc. IEEE Global Telecommunications Conf, 2004, pp. 1244 - 1248. [16] S. Coleri, M. Ergen, A. Puri, A. Bahai, “Channel estimation techniques based on pilot arrangement in OFDM Systems”, IEEE Trans. On Broadcasting, 2002 [17] H.-K. Song, Y.-h. You, J.-H. Paik, and Y.-S. Cho, “Frequency-Offset Synchronization and Channel Estimation for OFDM-Based Transmission,” IEEE Commun. Lett, vol. 4, pp. 95-97, Mar. 2000. [18] R. J. Lyman, and W. W. Edmonson, “Decision-Directed Tracking of Fading Channels Using Linear Prediction of the Fading Envelope,” in Proc. IEEE Asilomar Conf on Signal Processing Systems and Computers, vol. 2, 1999, pp. 1154-1158. [19] J. Ran, R. Gr¨unheid, H. Rohling, E. Bolinth and R. Kern, “Decision-directed Channel Estimation Method for OFDM Systems with High Velocities,” in Proc. IEEE Vehic. Tech. Conf. (VTC), 2003, pp. 2358-2361. [20] T. Kella, “Decision-directed Channel Estimation for Supporting Higher Terminal Velocities in OFDM Based WLANs,” in Proc. IEEE Global Telecommunications Conf, 2003, pp. 1306-1310. [21] H. Wang and P. Chang, “On verifying the first-order Markovian assumption for a Rayleigh fading channel model,” IEEE Trans. Veh. Technol., vol. 45, no. 2, pp. 353-357, May 1996. [22] P. H.-Y. Wu and A. Duel-Hallen, “Multiuser detectors with disjoint Kalman channel estimators for synchronous CDMA mobile radio channels,” IEEE Trans. Commun., vol. 48, no. 5, pp. 752-756, May 2000. [23] L. Lindbom, A. Ahlen, M. Sternad, and M. Falkenstrom, “Tracking of time-varying mobile radio channels- part II: a case study,” IEEE Trans. on Commun., vol. 50, no. 1, pp.52156-167, Jan. 2002 [24] K. E. Baddour and N. C. Beaulieu, “Autoregressive modeling for fading channel simulation,” IEEE Trans. Wireless Commun., vol. 4, no. 4, pp. 1650-1662, Jul. 2005. [24] Z. Liu, X. Ma, and G. B. Giannakis, “Space-time coding and Kalman filtering for time-selective fading channels,” IEEE Trans. Commun., vol. 50, no. 2, pp. 183-186, Feb 2002. [25] Jun-Han Oh and Jong-Tae Lim “ Two-Step Channel Estimation Scheme for OFDM Systems over Fast Rayleigh Fading Channels’’ IEEE Communications letters,vol.14, no. 6, June 2010 p.545 [26] F. Sanzi, S. Jelting, and J. Speidel, “A comparative study of iterative channel estimators for mobile OFDM systems,” IEEE Trans. Wireless Commun., vol. 2, no. 5, pp. 849-859, Sep. 2003. [27]Sinem Coleri, Mustafa Ergen, Anuj Puri, and Ahmad Bahai “Channel Estimation Techniques Based on Pilot Arrangement in OFDM Systems”IEEE Transansactions on Broadcasting, Vol. 48, no. 3, Sep .2002. [28] J.-J. van de Beek, O. Edfors, M. Sandell, and S. K. 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In OFDM systems, channel state information is important is important for the receiver to recover transmitted data from channel degraded signals. In order to enable the receiver to obtain the channel information, known training symbols will be transmitted, and the number of training symbols increases with the Doppler frequency .However, the transmission of a large number of training symbols will reduce the transmission efficiency. Decision directed channel estimation (DDCE),has been proposed to reduce the number of training symbols by performing channel estimation based on the temporarily detected data, which can be obtained based on the latest channel estimate, The performance of DDCE is restricted by the turns of temporarily detected data, which may even propagate to affect succeeding data detection and channel estimation. In this thesis, we will investigate the error propagation problem of DDCE and propose methods to solve this problem. Previous researches on improving the performance of DDCE extract detected data of high reliability for channel estimation, instead of using all detection results. However the computation of probability of correctness for extracting detection results in previous researches still requires the transmission of pilot data to obtain initial channel information. We will propose a new method for extracting reliable detection results by incorporating channel prediction in the evaluation of correct detection probability. Simulation results demonstrate that at the same even detection probability, the proposed algorithm can detect a larger number of data for channel estimation, and thus has better performance than existing algorithms.
其他識別: U0005-2308201215142600
Appears in Collections:電機工程學系所

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