Design of a Practical and Compact mm-Wave MIMO System with Optimized Capacity and Phased Arrays

Abstract

In this paper we evaluate the feasibility of short range outdoor mm-wave MIMO links in the 70 GHz portion of the E-band (71-76 GHz). We use phased arrays in order to strongly reduce the impact of the multipath components, thus making the channel mainly line-of-sight (LOS). We design the array using a simple patch as a single element and simulate the performances for a 200 m link and a MIMO system with equal element spacing at the transmitter and the receiver. Each node of the MIMO system consists of a uniform rectangular array (URA) where the single element is a patch antenna, in order to achieve higher gains and narrow beams. Such configuration is much more compact compared to the antennas currently employed for the same bandwidth. We optimize the interelement distances at the transmitter and the receiver and evaluate the capacity achievable with different array sizes. The results show that, for the proposed link budget, capacity up to 29 bit/s/Hz is achievable at a range of 200 m, with practical dimensions. We also show that the beamforming capabilities make the design much more flexible than the single reflector antenna systems. In the last part of the paper, we verify that our antenna can also operate in rainy conditions and longer ranges.

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“…Exploring new frequency bands is crucial due to two main factors: the saturation of the existing spectra and the increasing data rates and numbers of users in the new generation networks. The millimeter-wave (mm-wave) band seems to be a promising candidate for the radio access in urban and crowded areas and for small cells coverage, thanks to new technologies that have enabled to design transceivers of good performance at this band (Niu et al, 2015;Heath et al, 2016;Al-Falahy et al, 2019;Cella et al, 2014). Mm-wave band shows high propagation loss, due to free space propagation loss given by FRIIS equation (Equation 1), atmospheric absorption, and blockage from buildings and other obstacles (Rappaport et al, 2017).…”

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