Massive MIMO: Instantaneous versus Statistical CSI-Based Power Allocation

TL;DR

This paper compares instantaneous and statistical CSI-based power allocation in massive MIMO systems, highlighting trade-offs in performance, complexity, and practicality for real-world deployment.

Contribution

It provides a comprehensive analysis of the advantages and limitations of both CSI-based power control schemes in large-scale mMIMO systems.

Findings

Statistical CSI schemes are more resource-efficient but less optimal in certain configurations.

Instantaneous CSI schemes offer better performance at higher computational cost.

Practical implementation favors statistical schemes due to lower complexity.

Abstract

The deployment of instantaneous CSI-based power control schemes necessitates computationally intensive signal processing operations, requiring substantial resources to handle real-time CSI updates and the associated overhead. Conversely, statistical CSIbased schemes enable efficient implementation of advanced power allocation algorithms within large-scale massive MIMO (mMIMO) systems, where the algorithms are updated much less frequently. Nevertheless, these schemes may deviate from optimal results in certain practical mMIMO configurations, necessitating the adoption of instantaneous CSI-based schemes. In addition, they may be limited in practical implementation where instantaneous CSI-based resource allocation and management schemes are widely adopted. This lecture provides a comprehensive comparison between the statistical CSI-based power allocation and instantaneous CSI-based power allocation designs for mMIMO systems from performance, complexity, and practical implementation aspects.