TITLE:
Downlink Performance of Beamforming for High Mobility Users in 5G Cellular Network
AUTHORS:
Tahmina Khanom Tandra, Mariea Sharaf Anzum, Fehima Tajrian, Abdullah Bin Shams
KEYWORDS:
5G, Beamforming, User Velocity, Closed Loop Spatial Multiplexing, Proportional Fair, Round Robin
JOURNAL NAME:
Journal of Computer and Communications,
Vol.10 No.8,
August
26,
2022
ABSTRACT: 5G cellular infrastructures are supposed to provide higher data rate and lower latency along with the prospects of other various novel applications. But the signal strength seems to fluctuate unexpectedly due to doppler shift resulting in negative impacts on downlink performance parameters over the network for high-speed users. One potential solution to overcome this problem can be the concentration of energy to a particular location using multiple antennas at the base station so that receiving power can be increased for the intended user while suppressing interferences from others. So, this paper has investigated the performance of beamforming with closed loop spatial multiplexing over a specific range of velocity of users. However, the simulation results also demonstrate that by scaling the number of transmitting antennas, beamforming can elevate average throughput, improve quality of service for cell edge users and ensure better spectral efficiency under any existing scheduler with no complexities involved in system designing. Moreover, through the estimations of the channel conditions obtained from the precoding matrix of closed loop spatial multiplexing, the strength of the transmitted signal can be amplified accordingly to improve mean throughput and minimize the bit error rate. Therefore, the proposed scheme of scaling transmitting antennas through CLSM along with beamforming seems to circumvent the repercussions of doppler shift on downlink (DL) performance of high velocity cellular users.