Joint Power-Control and Antenna Selection in User-Centric Cell-Free Systems With Mixed Resolution ADC

Shekhar, Shashank; Subhash, Athira; Srinivasan, Muralikrishnan; Kalyani, Sheetal

doi:10.1109/tcomm.2022.3218835

Cited by 5 publications

(1 citation statement)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A reliable rate for each user was studied for an asymptotic regime in [23]. Finally, there has been a detailed SE analysis of variants of the CF-mMIMO system, known as the user-centric CF-mMIMO system (UC CF-mMIMO) in [24]- [27]. In a UC CF-mMIMO system, each AP serves only a predefined number of UEs rather than all.…”

mentioning

confidence: 99%

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

Shekhar,

Srinivasan,

Kalyani

et al. 2024

IEEE Open J. Commun. Soc.

Self Cite

View full text Add to dashboard Cite

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 signalto-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. INDEX TERMS Cell-free massive MIMO, outage probability, univariate dimension reduction I. INTRODUCTIONC ELL-free massive multiple-input multiple-output (CF-mMIMO) system is envisioned as a key enabler for sixth-generation (6G) communication systems. [1]-[4]. CF-mMIMO system contains many access points (APs) that are connected to a central processing unit (CPU) and jointly serve all the user equipment (UE) by coherent joint transmission and reception [5], [6]. The name cell-free comes from the fact that there are no boundaries, and each AP serves all the UEs. This differs from a conventional small-cell system where each AP serves only a particular set of UEs. Early works in [7], [8] compare the CF-mMIMO system with a conventional small-cell system and show a multifold improvement in 95%-likely throughput can be expected from CF-mMIMO.

show abstract

mentioning

confidence: 99%