Abstract

The multiple-input-multiple-output (MIMO) technology has become an essential element for 4G/5G wireless communication systems to achieve the necessities of higher data rates and communication reliability. Radio frequency power amplifier (RFPA) is the critical source of power consumption in such systems and produces nonlinear distortion due to its saturation property. This nonlinearity impairment is required to be essentially compensated as it further degrades the block error rate (BLER), error vector magnitude (EVM) and throughput performance of the data transmission through the wireless communication system due to which the advantages of MIMO systems like diversity gain and multiplexing gain cannot be fully achieved. This paper analyzes the effect of RFPA nonlinearity compensation using digital predistortion (DPD) with different MIMO configurations for the propagation conditions in the urban cities having very high traffic using MIMO diversity scheme. The paper establishes that better data rates as well as reliable data communication is achieved with higher order MIMO configurations. Moreover, RFPA nonlinearity compensation provides 6 times improvement in BLER, 2.77 times in throughput and about 2 times improvement in EVM measurements with MIMO 4×1 diversity at 15 dB signal-to-noise ratio (SNR).

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