Estimation of Uplink Channel for Multi-user LTE System in High-Speed Environment
Keywords:
Multi-user LTE, SC-FDMA, High-speed environment, Channel estimation, estimation updating algorithm.Abstract
This paper presents a novel estimation technique for the uplink channel of long-term evolution (LTE) system in high-speed environment without increasing any spectral overhead. With high terminal velocity, the time-varying channels being encountered making its coherence time is small enough to be compared with symbol duration. Hence a severe degradation in estimation process is being registered with conventional frame structure of LTE system where pilot symbols are introduced in each 0.5ms. This paper has proposed a frequency domain estimation updating algorithm to track the time-varying channel parameters and generate updated estimates in each payload symbol without any additional spectral overhead. A significant improvement in system performance in high-speed environment is registered.References
H. Myung, J. Lim, D. Goodman, “Single carrier FDMA for uplink wireless transmission†IEEE Vehicular Technology Magazine, vol. 1 (3), pp. 30-38, 2006.
Q. Li, G. Li, W. Lee, M. Lee, D. Mazzarese, B. Clerckx, Z. Li, “MIMO Techniques in WiMAX and LTE: A Feature Overview,†IEEE Communications Magazine,vol. 48, pp. 86-92, 2010.
F. Boccardi, B. Clerckx, A. Ghosh, E. Hardouin, “Multiple-Antenna Techniques in LTE-Advanced,†IEEE Communication Magazine, vol. 50 (3) pp. 114-12, 2012.
3GPP, TR 25.814. Physical Layer Aspects for Evolved UTRA.
K. Le, K. Dabke, “Effects of Doppler spread on adaptive orthogonal frequency division multiplexing channel capacity employing diversity in multipath environments,†Wireless Communication & Mobile Compututing, vol. 13 (17) , pp. 1532–1554, 2013.
B. Karakaya, H. Arsalan, H.A. Cripan, “Channel estimation for LTE uplink in high Doppler shift,†in proc. of IEEE WCNC, pp.1126-1130, 2008.
Z. Tangm, R.C. Cannizzaro, G. Leus, P. Banelli, “Pilot-Assisted Time-Varying Channel Estimation for OFDM Systems,†IEEE Trans. on signal processing, vol.v55(5), pp. 2226-2238, 2007.
L.Yang, G. Ren, B. Yang, Z. Qiu, “Fast Time-Varying Channel Estimation Technique for LTE Uplink in HST Environment,†IEEE Trans. on vehicular technology, vol. 61(9), pp. 4009-4019, 2012.
D. Shan, P. Richardson, W. Xiang, K. Zeng, H. Qianc, S. Addepalli, “Time-varying channel estimation through optimal piece-wise time-invariant approximation for high-speed train wireless communications,†Elsevier Journal of Vehicular Communications, vol. 1, pp. 67-77, 2014.
Y. Chen, “Semiblind channel estimation for MIMO single carrier with frequency-domain equalization systems,†IEEE Transaction Vehicular Technology , vol. 59(1), pp. 53-62, 2010.
S. Bandopadhaya, J.S. Roy, “Low complexity duplex model for multi-user LTE system in high speed train environment,†International Journal of applied engineering and research, vol. 10(7), pp. 17491-17501, 2015.
A. Li, R.C. deLamere, A.G. Burr, “Dynamic pilot allocation channel estimation with spatial multiplexing for MIMO-OFDM systems,†In proc. of IEEE Vehicular Technology Conf. 2011.
F. Abrishamkar, J. Irvine, “Comparison of current solutions for the provision of voice services to passengers on high speed trains,†in Proc.IEEE Veh. Technol. Conf. 2000, p. 2068–2075.
3GPP TS 36.211. Physical Channels and Modulation.
3GPP TS 36.101. User equipment (UE) radio transmission and reception.
3GPP TS 36.104. Base station (BS) radio transmission and reception.
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Copyright © The Author(s). This article is published under the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
