Prototype Filter Design for FBMC in Massive MIMO Channels

TL;DR

This paper analyzes the limitations of FBMC in massive MIMO systems, revealing that SINR is bounded due to correlation issues, and proposes a new filter design to overcome this, allowing unbounded SINR growth.

Contribution

The paper introduces a simple prototype filter design method for FBMC in massive MIMO that removes correlation and enables unlimited SINR increase with more antennas.

Findings

SINR is upper bounded in massive MIMO FBMC due to correlation.

A new filter design removes correlation, allowing unbounded SINR growth.

The proposed method improves FBMC performance in massive MIMO scenarios.

Abstract

We perform an asymptotic study on the performance of filter bank multicarrier (FBMC) in the context of massive multi-input multi-output (MIMO). We show that the signal-to-interference-plus-noise ratio (SINR) cannot grow unboundedly by increasing the number of base station (BS) antennas, and is upper bounded by a certain deterministic value. This is a result of the correlation between the multi-antenna combining tap values and the channel impulse responses between the terminals and the BS antennas. To solve this problem, we introduce a simple FBMC prototype filter design method that removes this correlation, enabling us to achieve arbitrarily large SINR values by increasing the number of BS antennas.