Performance Improvement of LeastSquares Adaptive Filter for High-Speed Train Communication Systems

Irma Zakia, Adit Kurniawan

Abstract


The downlink communication channel from high-altitude platform (HAP) to high-speed train (HST) in the Ka-band is a slowly time-varying Rician distributed flat fading channel with 10-25 dB Rician K factor. In this respect, the received signal is mainly affected by the Doppler shift of the line-of-sight (LOS) link. In order to increase receiver performance, we propose to firstly compensate the Doppler shift of the received signal before least-squares (LS) adaptive filtering is pursued. Implementing the proposed method requires a priori knowledge of the time-varying phase of the LOS component. This is justified since signalling between the train and the controller exists such that the train velocity and location are predictable. Implementing the proposed method to the recursive LS (RLS) received beamforming algorithm shows reduction of mean square error (MSE) and bit error rate (BER).

Keywords


adaptive beamforming; Doppler shift; high-altitude platform (HAP); high-speed train (HST); least-squares; line-of-sight (LOS); Rician fading.

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References


Ai, B., Cheng, X., Krner, T., Zhong, Z., Guan, K., He, R., Xiong, L., Matolak, D.W., Michelson, D.G. & Briso-Rodriguez, C., Challenges Toward Wireless Communications for High Speed Railway, IEEE Transactions on Intelligent Transportation Systems, 15(5), pp. 2143-2158, 2014.

Falletti, E., Sellone, F., Spillard, C. & Grace, D., A Transmit and Receive Multi-Antenna Channel Model and Simulator for Communications from High Altitude Platforms, International Journal of Wireless Information Networks, 13(1), pp. 59-75, 2006.

Mohorcic, M., Javornik, T., Lavric, A., Jelovcan, I., Falletti, E., Mondin, M., Boch, A., Feletti, L., Presti, L., Merino, D., Borio, D., Penin, J., Arino, F. & Bertran, E., Selection of Broadband Communication Standard for High-Speed Mobile Scenario, Capanina, http://www.capanina.org/documents/CAP-D09-WP21-JSI-PUB-01.pdf, (10 January 2017).

White, G., Falletti, E., Xu, Z., Borio, D., Sellone, F., Zakharov, Y., Presti, L. & Daneshgaran, F., Adaptive Beamforming Algorithms for Advanced Antenna Types for Aerial Platform and Ground Terminals, Capanina, http://www.capanina.org/documents/CAP-D17-WP33-UOY-PUB-01.pdf, 10 January 2017.

Zakia, I., Tjondronegoro, S., Iskandar & Kurniawan, A., Performance Comparison of LMS and RLS Adaptive Array on High Speed Train Delivered from High Altitude Platforms, in Proceedings of 2013 International Conference of Information and Communication Technology (ICoICT), pp. 28-32, 2013.

Zakia, I., Tjondronegoro, S., Iskandar & Kurniawan, A., On the Tracking Performance of Least Squares MIMO Channel Estimation in Rician Fading, IEICE Communications Express, 3(1), pp. 27-32, 2014.

Karami, E., Tracking Performance of Least Squares MIMO Channel Estimation Algorithm, IEEE Transactions on Communications, 55(11), pp. 2201-2208, 2007.

Cheng, M. & Fang, X., Location Information-assisted Opportunistic Beamforming in LTE System for High-speed Railway, EURASIP Journal on Wireless Communications and Networking, 2012(1), pp. 1-7, 2012.

Li, J. & Zhao, Y. Radio Environment Map-based Cognitive Doppler Spread Compensation Algorithms for High-speed Rail Broadband Mobile Communications, EURASIP Journal on Wireless Communications and Networking, 2012(1), pp. 1-18, 2012.

Zakia, I., Tjondronegoro, S., Iskandar & Kurniawan, A., Performance Improvement of Receiver for HAP-Based Communication with High Mobility using Recursive-Algorithm, PhD Dissertation, School of Electrical Engineering and Informatics, Institut Teknologi Bandung, Bandung, 2014.

Rappaport, T.S., Wireless Communications: Principles & Practice, 1st ed., Prentice-Hall:Upper Saddle River, NJ, 1996.

Iskandar & Shimamoto, S., Channel Characterization and Performance Evaluation of Mobile Communication Employing Stratospheric Platforms, IEICE Transactions on Communications, E89-B(3), pp. 937-944, 2006.

Holis, J. & Pechac, P., Elevation Dependent Shadowing Model for Mobile Communications via High Altitude Platforms in Built-up Areas, IEEE Transactions on Antennas and Propagation, 56(4), pp. 1078-1084, 2008.

Djuknic, G., Freidenfelds, J. & Okunev, Y., Establishing Wireless Communications Services via High-altitude Aeronautical Platforms: A concept whose time has come?, IEEE Communications Magazine, 35(9), pp. 128-135, 1997.

Haykin, S., Adaptive Filter Theory, 3rd ed., Prentice-Hall:Upper Saddle River, NJ, 1996.

Chen, P. & Li, H., An Iterative Algorithm for Doppler Spread Estimation in LOS Environments, IEEE Transactions on Wireless Communications, 5(6), pp. 1223-1228, 2006.

Kay, S., A Fast and Accurate Single Frequency Estimator, IEEE Transactions on Acoustics, Speech, and Signal Processing, 37(12), pp. 1987-1990, 1989.

Zakia, I., Tjondronegoro, S., Iskandar & Kurniawan, A., Received LS Beamforming on Ka-band Channel Model of HAP System, International Journal on Electrical Engineering and Informatics (IJEEI), 5(4), pp. 454-473, 2013.

Meyr, H., Moeneclaey, M. & Fechtel, S., Digital Communication Receivers: Synchronization, Channel Estimation and Signal Processing, John Wiley & Sons: New York, NY, 1998.




DOI: http://dx.doi.org/10.5614%2Fitbj.ict.res.appl.2017.11.2.3

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