Work

Uplink Performance of Cell-Free Extremely Large-Scale MIMO Systems

Year: 2024

Type: article

Abstract: In this paper, we investigate the uplink performance of cell-free (CF) extremely large-scale multiple-input-multiple-output (XL-MIMO) systems, which is a promising technique for future wireless communications. More specifically, we consider the practical scenario with multiple base stations (BSs) and multiple user equipments (UEs). To this end, we derive exact achievable spectral efficiency (SE) expressions for any combining scheme. It is worth noting that we derive the closed-form SE expressions for the CF XL-MIMO with maximum ratio (MR) combining. Numerical results show that the SE performance of the CF XL-MIMO can be hugely improved compared with the small-cell XL-MIMO. It is interesting that a smaller antenna spacing leads to a higher correlation level among patch antennas. Finally, we prove that increasing the number of BS antennas may decrease the SE performance with MR combining.

Source: IEEE Transactions on Vehicular Technology

DOI: 10.1109/tvt.2024.3523373

Authors: Hao Lei, Jiayi Zhang, Zhe Wang, Huahua Xiao, Bo Ai

Institutions: Beijing Jiaotong University, ZTE (China), State Key Laboratory of Mobile Networks and Mobile Multimedia Technology

Language: English

Topic: Advanced MIMO Systems Optimization

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Industry, innovation and infrastructure

Open Access status: green

Funders: National Natural Science Foundation of China, Natural Science Foundation of Jiangsu Province, Fundamental Research Funds for the Central Universities