DoA Estimation in EM Lens Assisted Mass...

In recent times, massive antenna array technologyhas captured significant attention among wirelesscommunication researchers. This is a field with strong potentialto increase rates of data transfer; mitigate interferenceand serve a large number of users simultaneously. Tocontribute further to this emerging technology, this paperpresents an approach for the line-of-sight (LoS) based directionof arrival (DoA) estimation using the electromagnetic(EM) lens-focusing antenna concept. The EM lens focusesthe received signal energy as a function of the angle of arrival(AoA) to a small subset/area of the antenna array. This isadvantageous, as it helps to reduce both hardware implementation(RF chains) and the complexity of signal processingin the large number of antennas system. Furthermore, thisfocusing capability of the EM lens provides additional interferencerejection gain which leads to estimate the DoA ofuser terminals precisely. Hence, in this work, subsets basedantenna selection approach and subspace-based high resolutionDoA estimation algorithms have been considered incombination with the EM lens assisted massive antenna system.In simulations where the DoA is estimated with the EMlens, the results are comparable with conventional methods ofDoA estimation without an EM lens, despite the significantlyreduced overall system complexity.