KSII Transactions on Internet and Information Systems (TIIS)

Korean Society for Internet Information (한국인터넷정보학회)
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Sum rate and Energy Efficiency of Massive MIMO Downlink with Channel Aging in Time Varying Ricean Fading Channel

  • Yang, Lihua (Jiangsu Key Laboratory of Wireless Communication, Nanjing University of Posts and Telecommunications) ;
  • Yang, Longxiang (Jiangsu Key Laboratory of Wireless Communication, Nanjing University of Posts and Telecommunications) ;
  • Zhu, Hongbo (Jiangsu Key Laboratory of Wireless Communication, Nanjing University of Posts and Telecommunications) ;
  • Liang, Yan (Jiangsu Key Laboratory of Wireless Communication, Nanjing University of Posts and Telecommunications)
  • Received : 2017.08.07
  • Accepted : 2017.10.12
  • Published : 2018.03.31
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Abstract

Achievable sum rate and energy efficiency (EE) are investigated for the massive multiple-input multiple-output (Massive MIMO) downlink with channel aging in the time varying Ricean fading channel. Specifically, the expression of the achievable sum rate of the system for the maximum ratio transmission (MRT) precoder with aged channel state information (CSI) in the time varying Ricean fading channel is first presented. Based on the expression, the effect of both channel aging and the Ricean factor on the power scaling law are studied. It is found that the transmit power of base station (BS) is scaled down by $1/{\sqrt{M}}$(where M is the number of the BS antennas) when the Ricean factor K is equal to zero (i.e., time varying Rayleigh fading channel), indicating that aged CSI does not affect the power scaling law. However, the transmit power of the BS is scaled down by 1/M for the time varying Ricean fading channel (where $K{\neq}0$) indicating that the Ricean factor affects the power scaling law and sum rate, and channel aging only leads to a reduction of the sum rate. Second, the EE of the system is analyzed based on the general power consumption model. Both the theoretical analysis and the simulations show that the channel aging could degrade the sum rate and the EE of the system, and it does not affect the power scaling law.

Keywords

References

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