作者
Talha Younas, Muluneh Mekonnen, Ghulam Farid, Sohaib Tahir, Osama Younas, Waqas Ahmad Wattoo, Muhammad Farhan, Mahrukh Liaqat
发表日期
2020
简介
Recently in many works, it has been identified that large-scale multiple-input-multiple-output (LSMIMO) is one of the key technologies for achieving extraordinary gains of energy and spectral efficiencies in wireless communication systems. This technology employs low cost hardware which enlightens its significance. The efficiency of single-cell or multi-cell LS-MIMO systems is affected by various factors such as hardware impairments, energy consumption, bandwidth allocation and outdated channel. In this paper LS-MIMO systems have been analyzed with the effects of channel aging or often called outdated channel. New expression for minimum-mean-square error (MMSE) estimate has been derived for LS-MIMO system in downlink (DL). We use three precoding schemes and results show that regularized zero-forcing (RZF) gives better performance than zero-forcing (ZF) and maximum ratio combining (MRT). We also show that how Doppler’s shift in combination of outdated channel affects the performance of the system with all the above mentioned precoding schemes.© 2020 Elsevier BV All rights reserved.
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T Younas, M Mekonnen, G Farid, S Tahir, O Younas… - 2020