Out-of-Band Radiation From Antenna Arrays Clarified

Larsson, Erik G.; Perre, Liesbet Van der

doi:10.1109/lwc.2018.2802519

Cited by 48 publications

(51 citation statements)

References 15 publications

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“…This confirms previous downlink [10]- [12] and uplink [13] results, derived with different system models. The question is now if the simplifying assumption of uncorrelated distortion (e.g., made in [7]- [9]) has significant impact on the SE.…”

Section: A Basic Modeling Of Bs Receiver Hardware Impairmentssupporting

confidence: 91%

Can Hardware Distortion Correlation be Neglected when Analyzing Uplink SE in Massive MIMO?

Björnson

Sanguinetti

Hoydis

2018

2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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This paper analyzes how the distortion created by hardware impairments in a multiple-antenna base station affects the uplink spectral efficiency (SE), with focus on Massive MIMO. The distortion is correlated across the antennas, but has been often approximated as uncorrelated to facilitate (tractable) SE analysis. To determine when this approximation is accurate, basic properties of the distortion correlation are first uncovered. Then, we focus on third-order non-linearities and prove analytically and numerically that the correlation can be neglected in the SE analysis when there are many users. In i.i.d. Rayleigh fading with equal signal-to-noise ratios, this occurs when having five users.Index Terms-Massive MIMO, uplink spectral efficiency, hardware impairments, hardware distortion correlation.

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Section: A Basic Modeling Of Bs Receiver Hardware Impairmentssupporting

confidence: 91%

Can Hardware Distortion Correlation be Neglected when Analyzing Uplink SE in Massive MIMO?

Björnson

Sanguinetti

Hoydis

2018

2018 IEEE 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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“…This cannot happen unless K ≥ M . This confirms previous downlink [20], [21], [24], [25] and uplink [26] results, derived with different system models. The equivalent model of the receiver distortion derived in this section is summarized in Fig.…”

Section: Lemma 1 Consider the Jointly Circular-symmetric Complexsupporting

confidence: 91%

“…Hence, we are implicitly assuming that no out-of-band interference exists. See[25],[26] for recent studies of out-of-band distortion in Massive MIMO.…”

mentioning

confidence: 99%

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

Björnson

Sanguinetti

Hoydis

2019

IEEE Trans. Commun.

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This paper analyzes how the distortion created by hardware impairments in a multiple-antenna base station affects the uplink spectral efficiency (SE), with focus on Massive MIMO. This distortion is correlated across the antennas, but has been often approximated as uncorrelated to facilitate (tractable) SE analysis. To determine when this approximation is accurate, basic properties of distortion correlation are first uncovered. Then, we separately analyze the distortion correlation caused by thirdorder non-linearities and by quantization. Finally, we study the SE numerically and show that the distortion correlation can be safely neglected in Massive MIMO when there are sufficiently many users. Under i.i.d. Rayleigh fading and equal signal-tonoise ratios (SNRs), this occurs for more than five transmitting users. Other channel models and SNR variations have only minor impact on the accuracy. We also demonstrate the importance of taking the distortion characteristics into account in the receive combining.Index Terms-Massive MIMO, uplink spectral efficiency, hardware impairments, hardware distortion correlation, optimal receive combining.

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“…These induce distortion terms especially when "pushed" to compensate for bad transmission situations. The distortion terms will in general not be uncorrelated, and they may have undesired effects such as generating out of band radiation [4]. A distributed array infrastructure creates a more uniform power distribution, which can reduce actual dynamic range requirements and avoid to drive PAs into nonlinear operation.…”

Section: Radioweaves Conceptmentioning

confidence: 99%

RadioWeaves for efficient connectivity: analysis and impact of constraints in actual deployments

Perre

Larsson

Tufvesson

et al. 2019

2019 53rd Asilomar Conference on Signals, Systems, and Computers

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We present a new type of wireless access infrastructure consisting of a fabric of dispersed electronic circuits and antennas that collectively function as a massive, distributed antenna array. We have chosen to name this new wireless infrastructure "RadioWeaves" and anticipate they can be integrated into indoor and outdoor walls, furniture, and other objects, rendering them a natural part of the environment. Technologically, RadioWeaves will deploy distributed arrays to create both favorable propagation and antenna array interaction. The technology leverages on the ideas of large-scale intelligent surfaces and cell-free wireless access. Offering close to the service connectivity and computing, new grades in energy efficiency, reliability, and low latency can be reached. The new concept moreover can be scaled up easily to offer a very high capacity in specific areas demanding so. In this paper we anticipate how two different demanding use cases can be served well by a dedicated RadioWeaves deployment: a crowd scenario and a highly reflective factory environment. A practical approach towards a RadioWeaves prototype, integrating dispersed electronics invisibly in a room environment, is introduced. We outline the many and diverse R&D challenges that need to be addressed to realize the great potential of the RadioWeaves technology. Index Terms-RadioWaves, energy efficient and ultra reliable connectivity, large-scale antenna arrays, cell-free wireless access. L. Van der Perre and L. De Strycker are with the Department of Electrical Engineering, KU Leuven, Belgium; L. Van der Perre, F. Tufvesson, and O. Edfors are with the

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Out-of-Band Radiation From Antenna Arrays Clarified

Cited by 48 publications

References 15 publications

Can Hardware Distortion Correlation be Neglected when Analyzing Uplink SE in Massive MIMO?

Can Hardware Distortion Correlation be Neglected when Analyzing Uplink SE in Massive MIMO?

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

RadioWeaves for efficient connectivity: analysis and impact of constraints in actual deployments

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