scholarly journals Optimal Pilot and Payload Power Control in Single-Cell Massive MIMO Systems

2017 ◽  
Vol 65 (9) ◽  
pp. 2363-2378 ◽  
Author(s):  
Hei Victor Cheng ◽  
Emil Bjornson ◽  
Erik G. Larsson
Keyword(s):  
Power Control ◽  
Single Cell ◽  
Massive Mimo ◽  
Mimo Systems

scholarly journals The Downlink Performance for Cell-Free Massive MIMO with Instantaneous CSI in Slowly Time-Varying Channels

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1552
Author(s):  
Tongzhou Han ◽  
Danfeng Zhao
Keyword(s):  
Power Control ◽  
Massive Mimo ◽  
Mimo Systems ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Time Varying ◽  
Input Multiple Output ◽  
Efficiency Performance ◽  
A Cell ◽  
Time Varying Channel

In centralized massive multiple-input multiple-output (MIMO) systems, the channel hardening phenomenon can occur, in which the channel behaves as almost fully deterministic as the number of antennas increases. Nevertheless, in a cell-free massive MIMO system, the channel is less deterministic. In this paper, we propose using instantaneous channel state information (CSI) instead of statistical CSI to obtain the power control coefficient in cell-free massive MIMO. Access points (APs) and user equipment (UE) have sufficient time to obtain instantaneous CSI in a slowly time-varying channel environment. We derive the achievable downlink rate under instantaneous CSI for frequency division duplex (FDD) cell-free massive MIMO systems and apply the results to the power control coefficients. For FDD systems, quantized channel coefficients are proposed to reduce feedback overhead. The simulation results show that the spectral efficiency performance when using instantaneous CSI is approximately three times higher than that achieved using statistical CSI.

scholarly journals Joint Pilot Allocation and Power Control to Enhance Max-Min Spectral Efficiency in TDD Massive MIMO Systems

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 149191-149201 ◽  
Author(s):  
Gang Liu ◽  
Honggui Deng ◽  
Xuewen Qian ◽  
Wenhui Wang ◽  
Gaofeng Peng
Keyword(s):  
Power Control ◽  
Spectral Efficiency ◽  
Massive Mimo ◽  
Mimo Systems ◽  
Pilot Allocation
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