Efficient Receiver for Cell-Free Massive MIMO Systems with Low-Resolution ADCs

The traditional multiple input multiple output (MIMO) systems cannot provide very high Spectral Efficiency (SE), Energy Efficiency (EE), and link reliability, which are critical to guaranteeing the desired Quality of Experience (QoE) in 5G and beyond 5G wireless networks. To bridge this gap, ultra-dense cell-free massive MIMO (UD CF-mMIMO) systems are exploited to boost cell-edge performance and provide ultra-low latency in emerging wireless communication systems. This paper attempts to provide critical insights on high EE operation and power control schemes for maximizing the performance of UD CF-mMIMO systems. First, the recent advances in UD CF-mMIMO systems and the associated models are elaborated. The power consumption model, power consumption parts, and energy maximization techniques are discussed extensively. Further, the various power control optimization techniques are discussed comprehensively. Key findings from this study indicate an unprecedented growth in high-rate demands, leading to a significant increase in energy consumption. Additionally, substantial gains in EE require efficient utilization of optimal energy maximization techniques, green design, and dense deployment of massive antenna arrays. Overall, this review provides an elaborate discussion of the research gaps and proposes several research directions, critical challenges, and useful recommendations for future works in wireless communication systems.

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“…Specialized models to minimize the impact of HI at the UE were not considered [124] Energy-efficient hardware component design…”

Section: Energy-efficient Hardware Component Designmentioning

confidence: 99%

A Review of Energy Efficiency and Power Control Schemes in Ultra-Dense Cell-Free Massive MIMO Systems for Sustainable 6G Wireless Communication

et al. 2022

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“…Furthermore, at low signal-to-noise ratio (SNR) conditions, MR yields superior performance compared to ZF. Compared to MR precoding, ZF does not work well with low-resolution analog-to-digital converters (ADCs) [25] and its effectiveness is greatly reduced in scenarios with very few active users [26]. The work of [26] provides a more complete analysis of MR and ZF, and also proposes a criterion for choosing between the MRC or the ZF precoders.…”

Section: System Modelmentioning

confidence: 99%

Hardening the Channels by Precoder Design in Massive MIMO With Multiple-Antenna Users

Sutton

Ngo

Matthaiou

2021

IEEE Trans. Veh. Technol.

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In this paper, we investigate the potential of a novel precoder for a massive multiple-input multiple-output (MIMO) system with multiple-antenna users under the influence of both Rayleigh and keyhole channel models. The proposed precoder is based on maximum-ratio processing and aims to enhance the channel hardening effect at the users. This is achieved through dividing each channel vector by its norm square. Closedform expressions for the achievable spectral efficiency of the conventional and proposed precoders are derived. If modeled with Rayleigh fading, due to the physical hardening property of this channel, a moderate gain in performance is produced by the proposed precoding method, where the highest spectral efficiency gain occurs for a small number of users and user antennas. Under Rayleigh fading, the results also demonstrate that similar performance is returned by increasing the users or user antennas. By comparison, the proposed precoder is shown to produce significant performance gains in the keyhole channels under the condition that the system is limited to singleantenna users. Corresponding to this, the results showcase how the performance of massive MIMO under keyhole channels is heavily dependent on increasing the number of served users over user antennas.

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Full-duplex cell-free mMIMO networks with coarse ADCs/DACs over Ricean fading for beyond 5G

Meng

Yue

Jin

2022

Computer Communications

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Efficient Receiver for Cell-Free Massive MIMO Systems with Low-Resolution ADCs

Cited by 5 publications

References 24 publications

A Review of Energy Efficiency and Power Control Schemes in Ultra-Dense Cell-Free Massive MIMO Systems for Sustainable 6G Wireless Communication

A Review of Energy Efficiency and Power Control Schemes in Ultra-Dense Cell-Free Massive MIMO Systems for Sustainable 6G Wireless Communication

Hardening the Channels by Precoder Design in Massive MIMO With Multiple-Antenna Users

Full-duplex cell-free mMIMO networks with coarse ADCs/DACs over Ricean fading for beyond 5G

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