Hardware Distortion Correlation Has Negligible Impact on UL Massive MIMO Spectral Efficiency

Björnson, Emil; Sanguinetti, Luca; Hoydis, Jakob

doi:10.1109/tcomm.2018.2877331

Cited by 59 publications

(79 citation statements)

References 33 publications

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“…Since the SEs of the users 1, 2, 3, and 4 (i.e., the users that are not the target of the jammer) are similar, we indicate the SEs of the users 1, and 3 as examples. The users and the jammer transmit the signals in the pilot and data phases with the transmit powers allocated by (23) and (26), respectively. It is clear that the performance of the proposed framework improves for the large antenna arrays.…”

Section: Numerical Experimentsmentioning

confidence: 99%

Jamming-Robust Uplink Transmission for Spatially Correlated Massive MIMO Systems

Akhlaghpasand

Björnson

Razavizadeh

2020

IEEE Trans. Commun.

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In this paper, we consider how the uplink transmission of a spatially correlated massive multiple-input multipleoutput (MIMO) system can be protected from a jamming attack. To suppress the jamming, we propose a novel framework including a new optimal linear estimator in the training phase and a bilinear equalizer in the data phase.The proposed estimator is optimal in the sense of maximizing the spectral efficiency of the legitimate system attacked by a jammer, and its implementation needs the statistical knowledge about the jammer's channel. We derive an efficient algorithm to estimate the jamming information needed for implementation of the proposed framework. Furthermore, we demonstrate that optimized power allocation at the legitimate users can improve the performance of the proposed framework regardless of the jamming power optimization. Our proposed framework can be exploited to combat jamming in scenarios with either ideal or non-ideal hardware at the legitimate users and the jammer. Numerical results reveal that using the proposed framework, the jammer cannot dramatically affect the performance of the legitimate system.

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Section: Numerical Experimentsmentioning

confidence: 99%

Jamming-Robust Uplink Transmission for Spatially Correlated Massive MIMO Systems

Akhlaghpasand

Björnson

Razavizadeh

2020

IEEE Trans. Commun.

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“…The Bussgang matrix A depends on both the properties of the input u exciting the nonlinearity and the nonlinearity f(u) itself. As shown in [19], it can be computed as A = E[r u H ](E[u u H ]) −1 and by substituting (5) into this expression we obtain…”

Section: A Bussgang Description Of the Power Amplifier Outputmentioning

confidence: 99%

Impact of Backward Crosstalk in 2 × 2 MIMO Transmitters on NMSE and Spectral Efficiency

Händel

Demir

Björnson

et al. 2020

IEEE Trans. Commun.

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Crosstalk between the transceiver branches appears in practical multi-antenna transmitters. This paper analyzes the backward crosstalk in 2 × 2 transmitters, which is caused by crosstalk from the outputs to inputs or by the combination of output crosstalk and impedance mismatch. We consider arbitrarily correlated input signals, while feedback networks and third-order memoryless polynomials are used to model the backward crosstalk and power amplifier, respectively. By utilizing the Bussgang decomposition, the transmitted signals are expressed as a linear transformation of the input signals plus uncorrelated distortion. First, the normalized mean-square errors (NMSEs) in the transmitted signals are derived analytically and used to obtain a closed-form expression for the power back-off that minimizes the worst NMSE of the two branches. Then, an achievable spectral efficiency (SE) is found for communication to a single-antenna receiver. The SE-maximizing precoder is derived by exploiting the hardware characteristics. Furthermore, the optimum power back-off is analyzed for two sub-optimum precoders, which either do not exploit any hardware knowledge or only partial knowledge.The simulation results show that the performances of these two sub-optimum precoders are in general close to the optimum SE. Furthermore, the power back-offs that minimize the NMSE and maximize SE are not the same. Index TermsOrthogonal frequency-division multiplexing (OFDM), input back-off, power amplifier, transmitter hardware imperfections, spectral efficiency P. Händel (deceased) was with the

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“…Here, C e (P) ∈ C M ×M is the covariance of the distortion e, which is given by (see, e.g., [17,Eq. (24)])…”

Section: A Modeling Of Transmitter Hardware Impairmentsmentioning

confidence: 99%

“…In these works, the distortion caused by nonideal hardware is modeled as an additive Gaussian noise that is uncorrelated over the antenna array. This is, however, not a realistic assumption as the distortion caused by nonlinearities is, in general, correlated over the antenna array [16], [17]. More recently, an aggregate hardware-impairment model for the distortion caused by nonlinear amplifiers, phase noise, and quantization, which captures the inherent correlation within the distortion, was provided in [18].…”

Section: Introductionmentioning

confidence: 99%

Distortion-Aware Linear Precoding for Millimeter-Wave Multiuser MISO Downlink

Aghdam

Jacobsson

Eriksson

2019

2019 IEEE International Conference on Communications Workshops (ICC Workshops)

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In this work, we propose an iterative scheme for computing a linear precoder that takes into account the impact of hardware impairments in the multiuser multiple-input singleoutput downlink. We particularly focus on the case when the transmitter is equipped with nonlinear power amplifiers. Using Bussgang's theorem, we formulate a lower bound on the achievable sum rate in the presence of hardware impairments, and maximize it using projected gradient ascent. We provide numerical examples that demonstrate the efficacy of the proposed distortionaware scheme for precoding over a millimeter-wave channel.Index Terms-Multiuser multiple-input single-output, downlink, millimeter wave, nonlinear power amplfier, hardware impairments, Bussgang's theorem, and linear precoding.

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Hardware Distortion Correlation Has Negligible Impact on UL Massive MIMO Spectral Efficiency

Cited by 59 publications

References 33 publications

Jamming-Robust Uplink Transmission for Spatially Correlated Massive MIMO Systems

Jamming-Robust Uplink Transmission for Spatially Correlated Massive MIMO Systems

Impact of Backward Crosstalk in 2 × 2 MIMO Transmitters on NMSE and Spectral Efficiency

Distortion-Aware Linear Precoding for Millimeter-Wave Multiuser MISO Downlink

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