Digital signal design and nonlinear distortions in antenna array beamforming

Markku Kiviranta; Aarne Mämmelä; Henna Paaso; Marko Höyhtyä; Ilkka Moilanen

doi:10.1109/WCNC.2009.4917670

Digital signal design and nonlinear distortions in antenna array beamforming

Markku Kiviranta, Aarne Mämmelä, Henna Paaso, Marko Höyhtyä, Ilkka Moilanen

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

4 Citations (Scopus)

Abstract

Antenna array beamforming reduces multipath fading components, and decreases the complexity of equalizer in a single carrier receiver. Nonlinear analog parts cause, however, impairments in the beamforming. In this paper we show that when the separate antenna elements include nonlinear amplifiers with different amplitude modulation to amplitude modulation (AM-AM) and amplitude modulation to phase modulation (AM- PM) conversions, there are errors in the level of main beam and in the direction of the main beam, respectively. There are no impairments in the beamforming if there is phase noise at the input of the antenna array. Anyhow, the phase noise may dramatically distort the signal constellation. A common method to avoid nonlinear distortions is to use modulation which has constant envelope. This is not enough if the nonlinear amplifier has memory.

Original language	English
Title of host publication	2009 IEEE Wireless Communications and Networking Conference
Publisher	IEEE Institute of Electrical and Electronic Engineers
Pages	1-6
ISBN (Electronic)	978-1-4244-2948-6
ISBN (Print)	978-1-4244-2947-9
DOIs	https://doi.org/10.1109/WCNC.2009.4917670
Publication status	Published - 12 May 2009
MoE publication type	A4 Article in a conference publication
Event	IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary Duration: 5 Apr 2009 → 8 Apr 2009

Conference

Conference	IEEE Wireless Communications and Networking Conference, WCNC 2009
Abbreviated title	WCNC 2009
Country/Territory	Hungary
City	Budapest
Period	5/04/09 → 8/04/09

Keywords

antenna arrays
array signal processing
fading channels
multipath channels
signal design
digital signal design
phase noise

Access to Document

10.1109/WCNC.2009.4917670

Cite this

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title = "Digital signal design and nonlinear distortions in antenna array beamforming",

abstract = "Antenna array beamforming reduces multipath fading components, and decreases the complexity of equalizer in a single carrier receiver. Nonlinear analog parts cause, however, impairments in the beamforming. In this paper we show that when the separate antenna elements include nonlinear amplifiers with different amplitude modulation to amplitude modulation (AM-AM) and amplitude modulation to phase modulation (AM- PM) conversions, there are errors in the level of main beam and in the direction of the main beam, respectively. There are no impairments in the beamforming if there is phase noise at the input of the antenna array. Anyhow, the phase noise may dramatically distort the signal constellation. A common method to avoid nonlinear distortions is to use modulation which has constant envelope. This is not enough if the nonlinear amplifier has memory.",

keywords = "antenna arrays, array signal processing, fading channels, multipath channels, signal design, digital signal design, phase noise",

author = "Markku Kiviranta and Aarne M{\"a}mmel{\"a} and Henna Paaso and Marko H{\"o}yhty{\"a} and Ilkka Moilanen",

year = "2009",

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pages = "1--6",

booktitle = "2009 IEEE Wireless Communications and Networking Conference",

publisher = "IEEE Institute of Electrical and Electronic Engineers",

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note = "IEEE Wireless Communications and Networking Conference, WCNC 2009, WCNC 2009 ; Conference date: 05-04-2009 Through 08-04-2009",

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Kiviranta, M , Mämmelä, A , Paaso, H, Höyhtyä, M & Moilanen, I 2009, Digital signal design and nonlinear distortions in antenna array beamforming. in 2009 IEEE Wireless Communications and Networking Conference. IEEE Institute of Electrical and Electronic Engineers, pp. 1-6, IEEE Wireless Communications and Networking Conference, WCNC 2009, Budapest, Hungary, 5/04/09. https://doi.org/10.1109/WCNC.2009.4917670

Digital signal design and nonlinear distortions in antenna array beamforming. / Kiviranta, Markku ; Mämmelä, Aarne ; Paaso, Henna et al.
2009 IEEE Wireless Communications and Networking Conference. IEEE Institute of Electrical and Electronic Engineers, 2009. p. 1-6.

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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T1 - Digital signal design and nonlinear distortions in antenna array beamforming

AU - Kiviranta, Markku

AU - Mämmelä, Aarne

AU - Paaso, Henna

AU - Höyhtyä, Marko

AU - Moilanen, Ilkka

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N2 - Antenna array beamforming reduces multipath fading components, and decreases the complexity of equalizer in a single carrier receiver. Nonlinear analog parts cause, however, impairments in the beamforming. In this paper we show that when the separate antenna elements include nonlinear amplifiers with different amplitude modulation to amplitude modulation (AM-AM) and amplitude modulation to phase modulation (AM- PM) conversions, there are errors in the level of main beam and in the direction of the main beam, respectively. There are no impairments in the beamforming if there is phase noise at the input of the antenna array. Anyhow, the phase noise may dramatically distort the signal constellation. A common method to avoid nonlinear distortions is to use modulation which has constant envelope. This is not enough if the nonlinear amplifier has memory.

AB - Antenna array beamforming reduces multipath fading components, and decreases the complexity of equalizer in a single carrier receiver. Nonlinear analog parts cause, however, impairments in the beamforming. In this paper we show that when the separate antenna elements include nonlinear amplifiers with different amplitude modulation to amplitude modulation (AM-AM) and amplitude modulation to phase modulation (AM- PM) conversions, there are errors in the level of main beam and in the direction of the main beam, respectively. There are no impairments in the beamforming if there is phase noise at the input of the antenna array. Anyhow, the phase noise may dramatically distort the signal constellation. A common method to avoid nonlinear distortions is to use modulation which has constant envelope. This is not enough if the nonlinear amplifier has memory.

KW - antenna arrays

KW - array signal processing

KW - fading channels

KW - multipath channels

KW - signal design

KW - digital signal design

KW - phase noise

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M3 - Conference article in proceedings

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ER -

Digital signal design and nonlinear distortions in antenna array beamforming

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Keywords

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