Outage Probability Analysis of Uplink Cell-Free Massive MIMO Network With and Without Pilot Contamination
Journal article, 2024

This paper derives approximate outage probability (OP) expressions for uplink cell-free massive multiple-input-multiple-output (CF-mMIMO) systems with and without pilot contamination. The system’s access points (APs) are considered to have imperfect channel state information (CSI). The signal-to-interference-plus-noise ratio (SINR) of the CF-mMIMO system is approximated via a Log-normal distribution using a two-step moment matching method. OP and ergodic rate expressions are derived with the help of the approximated Log-normal distribution. For the no-pilot contamination scenario, an exact expression is first derived using conditional expectations in terms of a multi-fold integral. Then, a novel dimension reduction method is used to approximate it by the sum of single-variable integrations. Both the approximations derived for the CF-mMIMO systems are also useful for single-cell collocated massive MIMO (mMIMO) systems and lead to closed-form expression. The derived expressions closely match the simulated numerical values for OP and ergodic rate.

Dimensionality reduction

Contamination

Cell-free massive MIMO

Signal to noise ratio

outage probability

Downlink

Interference

univariate dimension reduction

Uplink

Massive MIMO

Author

Shashank Shekhar

Indian Institute of Technology

Muralikrishnan Srinivasan

Chalmers, Electrical Engineering, Communication, Antennas and Optical Networks

Sheetal Kalyani

Indian Institute of Technology

Mohamed-Slim Alouini

King Abdullah University of Science and Technology (KAUST)

IEEE Open Journal of the Communications Society

2644125X (eISSN)

Vol. 5 168-184

Subject Categories

Telecommunications

Signal Processing

DOI

10.1109/OJCOMS.2023.3340555

More information

Latest update

5/29/2024