A Rate Splitting Strategy for Mitigating Intra-Cell Pilot Contamination in Massive MIMO

Thomas, Christo Kurisummoottil; Clerckx, Bruno; Sanguinetti, Luca; Slock, Dirk

doi:10.1109/iccworkshops49005.2020.9145128

Cited by 16 publications

(15 citation statements)

References 15 publications

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“…For TDD massive MIMO, RSMA has been studied in a more realistic scenario where the channel estimation at the transmitter is hampered by hardware impairments in [93]. The authors of [113] further investigate the potential of RSMA to mitigate pilot contamination. 1layer RS has been shown to achieve a substantial gain over conventional massive MIMO based on MU-LP when CSIT is compromised by two different impairment sources (hardware impairments and pilot contamination).…”

Section: A Rsma For Enabling Technologies In 6gmentioning

confidence: 99%

“…To further reduce the computational complexity, another line of RSMA research focuses on closed-form and lowcomplexity precoder designs [57], [71], [72], [76], [80], [81], [88], [92], [93], [97], [113], [134], which is summarized in this subsection.…”

Section: B Low-complexity Precoder Designmentioning

confidence: 99%

“…• Weighted matched beamforming (MBF) [72], [76], [81], [92], [93], [97], [113], [134]: The precoder direction pc is designed to maximize the achievable rate of the common stream, which can be formulated as follows…”

Section: B Low-complexity Precoder Designmentioning

confidence: 99%

“…For other channel conditions, i.e., when the user channels are neither orthogonal nor aligned, RS takes advantage of the common streams to better manage the interference and outperforms all other MA schemes. • Robustness: As the application of RSMA in multiantenna networks is motivated by its DoF optimality in the multi-antenna BC with imperfect CSIT, RSMA is ideally suited to manage multi-user interference originating from imperfect CSIT and is robust to CSIT inaccuracies resulting from different sources of impairment, such as quantized feedback [92], pilot contamination [113], channel estimation errors [58], and user mobility [88].…”

Section: Advantages Of Rsmamentioning

confidence: 99%

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Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends

Mao,

Dizdar,

Clerckx

et al. 2022

Preprint

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Rate-splitting multiple access (RSMA) has emerged as a novel, general, and powerful framework for the design and optimization of non-orthogonal transmission, multiple access (MA), and interference management strategies for future wireless networks. By exploiting splitting of user messages as well as non-orthogonal transmission of common messages decoded by multiple users and private messages decoded by their corresponding users, RSMA can softly bridge and therefore reconcile the two extreme interference management strategies of fully decoding interference and treating interference as noise. RSMA has been shown to generalize and subsume as special cases four existing MA schemes, namely, orthogonal multiple access (OMA), physical-layer multicasting, space division multiple access (SDMA) based on linear precoding (currently used in the fifth generation wireless network-5G), and non-orthogonal multiple access (NOMA) based on linearly precoded superposition coding with successive interference cancellation (SIC). Through information and communication theoretic analysis, RSMA has been shown to be optimal (from a Degrees-of-Freedom region perspective) in several transmission scenarios. Compared to the conventional MA strategies used in 5G, RSMA enables spectral efficiency (SE), energy efficiency (EE), coverage, user fairness, reliability, and quality of service (QoS) enhancements for a wide range of network loads (including both underloaded and overloaded regimes) and user channel conditions. Furthermore, it enjoys a higher robustness against imperfect channel state information at the transmitter (CSIT) and entails lower feedback overhead and complexity. Despite its great potential to fundamentally change the physical (PHY) layer and media access control (MAC) layer of wireless communication networks, RSMA is still confronted with many challenges on the road towards standardization. In this paper, we present the first comprehensive tutorial on RSMA by providing a survey of the pertinent state-ofthe-art research, detailing its architecture, taxonomy, and various appealing applications, as well as comparing with existing MA schemes in terms of their overall frameworks, performance, and complexities. An in-depth discussion of future RSMA research challenges is also provided to inspire future research on RSMAaided wireless communication for beyond 5G systems.

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Section: A Rsma For Enabling Technologies In 6gmentioning

confidence: 99%

Section: B Low-complexity Precoder Designmentioning

confidence: 99%

Section: B Low-complexity Precoder Designmentioning

confidence: 99%

Section: Advantages Of Rsmamentioning

confidence: 99%

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Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends

Mao,

Dizdar,

Clerckx

et al. 2022

Preprint

Self Cite

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“…Compared to that of the conventional non-RS scheme, the RS scheme is able to enhance the sum-rate, especially in the presence of hardware impairments caused by phase noise and amplified thermal noise [13]. Furthermore, RS multiple access is a robust strategy to combat the effects of residual self-interference (SI) and intracell pilot contamination in massive MIMO systems [14,15].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Rate Splitting in Massive MIMO Systems with Low Resolution ADCs/DACs

Ahiadormey

Choi

2021

Applied Sciences

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In this paper, we propose rate-splitting (RS) multiple access to mitigate the effects of quantization noise (QN) inherent in low-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). We consider the downlink (DL) of a multiuser massive multiple-input multiple-output (MIMO) system where the base station (BS) is equipped with low-resolution ADCs/DACs. The BS employs the RS scheme for data transmission. Under imperfect channel state information (CSI), we characterize the spectral efficiency (SE) and energy efficiency (EE) by deriving the asymptotic signal-to-interference-and-noise ratio (SINR). For 1-bit resolution, the QN is very high, and the RS scheme shows no rate gain over the non-RS scheme. As the ADC/DAC resolution increases (i.e., 2–3 bits), the RS scheme achieves higher SE in the high signal-to-noise ratio (SNR) regime compared to that of the non-RS scheme. For a 3-bit resolution, the number of antennas can be reduced by 27% in the RS scheme to achieve the same SE as the non-RS scheme. Low-resolution DACs degrades the system performance more than low-resolution ADCs. Hence, it is preferable to equip the system with low-resolution ADCs than low-resolution DACs. The system achieves the best SE/EE tradeoff for 4-bit resolution ADCs/DACs.

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Coverage, Throughput, and Energy Efficiency Enhancement in Beamspace Massive MIMO System Using Rate-Splitting and Orthogonal Precoding

Alimo,

Hamamura,

Sabuj

2024

IEEE Access

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A Rate Splitting Strategy for Mitigating Intra-Cell Pilot Contamination in Massive MIMO

Cited by 16 publications

References 15 publications

Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends

Rate-Splitting Multiple Access: Fundamentals, Survey, and Future Research Trends

Performance Analysis of Rate Splitting in Massive MIMO Systems with Low Resolution ADCs/DACs

Coverage, Throughput, and Energy Efficiency Enhancement in Beamspace Massive MIMO System Using Rate-Splitting and Orthogonal Precoding

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