Broadbeam for Massive MIMO Systems

TL;DR

This paper investigates the limitations of creating a perfect broadbeam in Massive MIMO systems and proposes a method to generate a broadbeam with minimal power fluctuations, aiding practical 5G deployment.

Contribution

It demonstrates the impossibility of perfect broadbeam formation and introduces a new method to produce near-uniform radiated power with slight fluctuations.

Findings

Perfect broadbeam cannot be achieved.

Proposed method allows tiny power fluctuations.

Facilitates practical deployment of Massive MIMO.

Abstract

Massive MIMO has been identified as one of the promising disruptive air interface techniques to address the huge capacity requirement demanded by 5G wireless communications. For practical deployment of such systems, the control message need to be broadcast to all users reliably in the cell using broadbeam. A broadbeam is expected to have the same radiated power in all directions to cover users in any place in a cell. In this paper, we will show that there is no perfect broadbeam. Therefore, we develop a method for generating broadbeam that can allow tiny fluctuations in radiated power. Overall, this can serve as an ingredient for practical deployment of the massive MIMO systems.