Cell-Free Massive MIMO-OFDM Transmission over Frequency-Selective Fading Channels

TL;DR

This paper proposes an OFDM-based transmission scheme for cell-free massive MIMO systems over frequency-selective channels, introducing scalable and flexible methods for beamforming, pilot assignment, and resource allocation.

Contribution

It introduces a novel OFDM-based transmission framework for CFmMIMO over frequency-selective channels with new beamforming, pilot, and resource allocation strategies.

Findings

Scalable to serve many users

Flexible for diverse data rate requirements

Effective in frequency-selective fading environments

Abstract

This letter presents and analyzes orthogonal frequency-division multiplexing (OFDM)-based multi-carrier transmission for cell-free massive multi-input multi-output (CFmMIMO) over frequency-selective fading channels. Frequency-domain conjugate beamforming, pilot assignment, and user-specific resource allocation are proposed. CFmMIMO-OFDM is scalable to serve a massive number of users and is flexible to offer diverse data rates for heterogeneous applications.