Impact of Beamforming on Delay Spread in Wideband Millimeter-wave Systems

Akgun, B; Krunz, M; Manzi, D

Impact of Beamforming on Delay Spread in Wideband Millimeter-wave Systems

Akgun, B Krunz, M Manzi, D

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Publisher:: IEEE
Publication Type:: Conference Proceeding
Citation:: 2020 International Conference on Computing, Networking and Communications (ICNC), 2020, 00, pp. 890-896
Issue Date:: 2020-03-30

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Field	Value	Language
dc.contributor.author	Akgun, B
dc.contributor.author	Krunz, M
dc.contributor.author	Manzi, D
dc.date	2020-02-17
dc.date.accessioned	2021-05-21T02:34:25Z
dc.date.available	2021-05-21T02:34:25Z
dc.date.issued	2020-03-30
dc.identifier.citation	2020 International Conference on Computing, Networking and Communications (ICNC), 2020, 00, pp. 890-896
dc.identifier.isbn	978-1-7281-4906-6
dc.identifier.issn	2325-2626
dc.identifier.uri	http://hdl.handle.net/10453/149035
dc.description.abstract	The harsh propagation environment at millimeter-wave (mmW) frequencies can be countered by using large antenna arrays, which can be steered electronically to create directional beams. Knowledge of the key channel characteristics in this environment, including the delay spread, the coherence time, and the coherence bandwidth, plays a significant role in optimal adaptation of the transmission waveform. In this paper, we focus on analyzing the delay spread of a directional mmW channel. A high delay spread causes inter-symbol interference (ISI), which can be mitigated by concatenating cyclic prefixes (CPs) to data symbols at the expense of lower spectral efficiency. Considering a single mmW link, whose transmitter (Tx) and receiver (Rx) are equipped with uniform planar arrays (UPAs), we study the impact of various beamforming attributes (e.g., antenna-array size, beamwidth, beam direction, and beam misalignment) on the average and root-mean-square delay spread. We use detailed simulations with accurate 3GPP channel models and conduct extensive experiments using a $4\times 8$ UPA at 28 GHz to verify our analysis. Based on this analysis, we study the optimal beamforming configuration at the Rx for a given Tx beamformer so as to maximize the spectral efficiency. Our proposed beam selection method finds the best Rx beam direction that results in a low delay spread and high signal-to-noise ratio (SNR). Our extensive simulation and experimental results verify that this method significantly improves the spectral efficiency, almost doubling the data rate in some cases.
dc.language	en
dc.publisher	IEEE
dc.relation.ispartof	2020 International Conference on Computing, Networking and Communications (ICNC)
dc.relation.ispartof	International Conference on Computing, Networking and Communications
dc.relation.isbasedon	10.1109/icnc47757.2020.9049739
dc.rights	info:eu-repo/semantics/closedAccess
dc.title	Impact of Beamforming on Delay Spread in Wideband Millimeter-wave Systems
dc.type	Conference Proceeding
utslib.citation.volume	00
utslib.location.activity	Big Island, HI, USA
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Electrical and Data Engineering
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-05-21T02:34:24Z
pubs.finish-date	2020-02-20
pubs.publication-status	Published
pubs.start-date	2020-02-17
pubs.volume	00

Abstract:

The harsh propagation environment at millimeter-wave (mmW) frequencies can be countered by using large antenna arrays, which can be steered electronically to create directional beams. Knowledge of the key channel characteristics in this environment, including the delay spread, the coherence time, and the coherence bandwidth, plays a significant role in optimal adaptation of the transmission waveform. In this paper, we focus on analyzing the delay spread of a directional mmW channel. A high delay spread causes inter-symbol interference (ISI), which can be mitigated by concatenating cyclic prefixes (CPs) to data symbols at the expense of lower spectral efficiency. Considering a single mmW link, whose transmitter (Tx) and receiver (Rx) are equipped with uniform planar arrays (UPAs), we study the impact of various beamforming attributes (e.g., antenna-array size, beamwidth, beam direction, and beam misalignment) on the average and root-mean-square delay spread. We use detailed simulations with accurate 3GPP channel models and conduct extensive experiments using a $4\times 8$ UPA at 28 GHz to verify our analysis. Based on this analysis, we study the optimal beamforming configuration at the Rx for a given Tx beamformer so as to maximize the spectral efficiency. Our proposed beam selection method finds the best Rx beam direction that results in a low delay spread and high signal-to-noise ratio (SNR). Our extensive simulation and experimental results verify that this method significantly improves the spectral efficiency, almost doubling the data rate in some cases.

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http://hdl.handle.net/10453/149035