Distortion-Aware Linear Precoding for Massive MIMO Downlink Systems with Nonlinear Power Amplifiers

Aghdam, Sina Rezaei; Jacobsson, Susanne; Gustavsson, Ulf; Durisi, Giuseppe; Studer, Christoph; Eriksson, Thomas

doi:10.48550/arxiv.2012.13337

Cited by 4 publications

(13 citation statements)

References 28 publications

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“…where ζ (j−1) /σ (j−1) > 2 and X, Y = ℜ Tr X H Y . The operator Π SP B denotes the projection of B onto the power constraint set S P B i P PA (B i ) ≤ P , given by [36] Π…”

Section: B Dinkelbach's Extended Algorithm and Steepest Ascent Methodsmentioning

confidence: 99%

“…In the following, without loss of generality, we focus on a third-order polynomial NPA model by setting M = 1 in Eq. ( 5), which is given by [36]- [38] ρ…”

Section: B Hybrid Precoding With Trps Networkmentioning

confidence: 99%

“…With the step size chosen according to the RSS/RSC in the adopted projected steepest gradient ascent method, the result B (J) i of each subproblem converges to a stationary point [44,Theorem 3.3]. Besides, the search through the steepest gradient is repeated until the subproblems converge to their local maximum values [36]. Then, the objective EE in each algorithm iteration is monotonically nondecreasing and thus, based on [13, Theorem 2.2], Dinkelbach's extended algorithm is guaranteed to converge to a stationary point.…”

Section: Convergence and Complexity Analysismentioning

confidence: 99%

“…Concerning the effect caused by NPAs, the signal distortion has been statistically characterized in [21] and the corresponding SE and EE performance is analyzed as well for special case with a single UT. For more practical cases with several UTs, in [36], the authors designed a linear precoding method for massive MIMO downlink systems considering the effect of NPAs.…”

mentioning

confidence: 99%

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Massive MIMO Hybrid Precoding for LEO Satellite Communications With Twin-Resolution Phase Shifters and Nonlinear Power Amplifiers

You

Qiang

et al. 2022

IEEE Trans. Commun.

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The massive multiple-input multiple-output (MIMO) transmission technology has recently attracted much attention in the non-geostationary, e.g., low earth orbit (LEO) satellite communication (SATCOM) systems since it can significantly improve the energy efficiency (EE) and spectral efficiency. In this work, we develop a hybrid analog/digital precoding technique in the massive MIMO LEO SATCOM downlink, which reduces the onboard hardware complexity and power consumption. In the proposed scheme, the analog precoder is implemented via a more practical twin-resolution phase shifting (TRPS) network to make a meticulous tradeoff between the power consumption and array gain. In addition, we consider and study the impact of the distortion effect of the nonlinear power amplifiers (NPAs) in the system design. By jointly considering all the above factors, we propose an efficient algorithmic approach for the TRPS-based hybrid precoding problem with NPAs. Numerical results show the EE gains considering the nonlinear distortion and the performance superiority of the proposed TRPS-based hybrid precoding scheme over the baselines.

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“…where ζ (j−1) /σ (j−1) > 2 and X, Y = ℜ Tr X H Y . The operator Π SP B denotes the projection of B onto the power constraint set S P B i P PA (B i ) ≤ P , given by [36] Π…”

Section: B Dinkelbach's Extended Algorithm and Steepest Ascent Methodsmentioning

confidence: 99%

“…In the following, without loss of generality, we focus on a third-order polynomial NPA model by setting M = 1 in Eq. ( 5), which is given by [36]- [38] ρ…”

Section: B Hybrid Precoding With Trps Networkmentioning

confidence: 99%

Section: Convergence and Complexity Analysismentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Massive MIMO Hybrid Precoding for LEO Satellite Communications With Twin-Resolution Phase Shifters and Nonlinear Power Amplifiers

You

Qiang

et al. 2022

IEEE Trans. Commun.

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show abstract

“…As opposed to previous techniques, we propose a novel linear precoder, which compensates nonlinear distortion and can be implemented in addition to or instead of a DPD. A recent work [8] has followed a similar approach. However, no simple closed-form solution for the precoder was presented.…”

Section: Introductionmentioning

confidence: 99%

Z3RO Precoder Canceling Nonlinear Power Amplifier Distortion in Large Array Systems

Rottenberg¹,

Callebaut²,

Perre³

2022

ICC 2022 - IEEE International Conference on Communications

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Large array-based transmission uses the combination of a massive number of antenna elements and clever precoder designs to achieve array gain and spatially multiplex different users. These precoders require linear front-ends, and more specifically linear power amplifiers (PAs). However, this reduces energy efficiency since PAs are most efficient close to saturation, where they generate most nonlinear distortion. Moreover, the use of conventional precoders, such as maximum ratio transmission (MRT), induces a coherent combining of distortion at the user location, degrading the signal quality. In this work, a linear precoder is proposed that allows working close to saturation while canceling the coherent combining of the third order nonlinear PA distortion at the user location. In contrast to other solutions, the zero third-order distortion (Z3RO) precoder does not require prior knowledge of the signal statistics and the PA model. The design consists of saturating a single or a few antennas on purpose together with an opposite phase shift to compensate for the distortion of all other antennas. The resulting array gain penalty becomes negligible as the number of base station antennas grows large.

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Distortion-Aware Power Allocation for Multi-Stream Distributed Massive MIMO System With Nonlinear Power Amplifier

Liu,

Pollin

2024

IEEE Open J. Commun. Soc.

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Distributed MIMO systems leverage multiple access points (APs) distributed across a geographical area to enhance system performance and provide robust connectivity to users by transmitting independent data streams simultaneously, thus improving coverage and capacity. The nonlinear power amplifiers (PAs) employed at the APs can significantly distort the transmitted signal and degrade the spectral efficiency (SE), as PAs are more efficient when operating close to saturation. In this paper, we present an efficient power allocation framework in a multi-stream distributed massive MIMO system with nonlinear PAs, where APs send multiple spatial streams to the user equipment (UE). With the objective of maximizing the SE while adhering to total input power constraints, we first formulate the power allocation problem as nonlinear programming, which is first solved using the multiplier punitive functionbased method. Moreover, we focus on the asymptotic analysis of the SE when multi-stream interference among APs is negligible. This can be achieved through ideal spatial multiplexing with interference nulling, assuming a sufficiently large antenna at the UE, or through interference-free frequency multiplexing. We examine the optimality of the water-filling method in power allocation and extend it by considering the PA's nonlinearity. Simulation results show that the proposed power allocation method can maximize the achievable rate while considering the PA nonlinearity, thereby preventing degradation in performance.INDEX TERMS Distributed massive MIMO, multi-streams, nonlinear power amplifier, power allocation, AP selection.

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Distortion-Aware Linear Precoding for Massive MIMO Downlink Systems with Nonlinear Power Amplifiers

Cited by 4 publications

References 28 publications

Massive MIMO Hybrid Precoding for LEO Satellite Communications With Twin-Resolution Phase Shifters and Nonlinear Power Amplifiers

Massive MIMO Hybrid Precoding for LEO Satellite Communications With Twin-Resolution Phase Shifters and Nonlinear Power Amplifiers

Z3RO Precoder Canceling Nonlinear Power Amplifier Distortion in Large Array Systems

Distortion-Aware Power Allocation for Multi-Stream Distributed Massive MIMO System With Nonlinear Power Amplifier

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