Authors H.Е.A. Mahyoub, N.N. Kisel, S.G. Grishchenko
Month, Year 11, 2015 @en
Index UDC 629.7.028.6
Abstract In this paper the model of communication channel with non-ideal hardware has been considered that uses massive MIMO systems at the base stations, and a small antenna in user equipment. In the paper the research of the model of communication channel massive MIMO with non-ideal hardware at the base stations and in user equipment for the communication system of the 5th generation had been performed and the capacity and channel estimation accuracy for systems channel massive MIMO with non-ideal hardware at the base stations and in user equipment had been analyzed using MatLab. The used model of communication channel takes into account the distortion of equipment on each antenna using distorting additive noise proportional to the signal power at this antenna. The source data for the analysis of spectral efficiency of communication channel are the number of antennas at the REF, the levels of distortion equipment base stations and user equipment, the correlation coefficient between adjacent antennas, signal/noise ratio, the duration of the pilot signal, time modeling and time step and transmitter power. The fulfilled analysis showed that the use of massive MIMO in wireless network 5G allows to achieve a relatively high spectral efficiency and energy efficiency. It is shown that the distortion parameters and characteristics of hardware influence the channel estimation accuracy and limit the bandwidth of each user terminal for uplink and downlink communication lines. By increasing the number of antennas at the base stations can be reduce the requirements to the quality of the base station equipment. Distortions in the user equipment limit the channel capacity by increasing the number of N antennas of base stations.

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Keywords Communication channel; massive MIMO systems; base station.
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