Channel Characterization for Wideband Large-Scale Antenna Systems Based on a Low-Complexity Maximum Likelihood Estimator

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Resumé

Wideband large-scale array systems operating at millimeter-wave bands are expected to play a key role in future communication systems. It is recommended by standardization groups to use sphericalwave models (SWMs) to characterize the channel in near-field cases because of the large array apertures and the small cell size. However, this feature is not widely reflected in channel models yet, mainly due to the high computational complexity of SWMs compared to that of the conventional plane-wave model (PWM), especially when ultrawideband signals are considered. In this paper, a maximum likelihood estimator (MLE) of low computational complexity is implemented with a SWM for ultrawideband signals. The measurement data obtained from an ultrawideband large-scale antenna array system at 28-30GHz are processed with the proposed algorithm. The power azimuth-delay profiles (PADP) estimated from the SWM and the PWM are compared to those obtained from rotational horn antenna measurement, respectively. It shows that the multipath components (MPCs) are well-estimated with the proposed algorithm, and significant improvement in estimation performance is achieved with the SWM compared to the PWM. Moreover, the physical interpretation of the estimated MPCs is also given along with the estimated scatterers.
OriginalsprogEngelsk
Artikelnummer8412215
TidsskriftI E E E Transactions on Wireless Communications
Vol/bind17
Udgave nummer9
Sider (fra-til)6018-6028
Antal sider11
ISSN1536-1276
DOI
StatusUdgivet - 1 sep. 2018

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Maximum Likelihood Estimator
Low Complexity
Maximum likelihood
Antenna
Antennas
Plane Wave
Ultra-wideband (UWB)
Multipath
Model
Computational Complexity
Computational complexity
Cell Size
Antenna Arrays
Millimeter Wave
Horn antennas
Azimuth
Channel Model
Standardization
Near-field
Communication Systems

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title = "Channel Characterization for Wideband Large-Scale Antenna Systems Based on a Low-Complexity Maximum Likelihood Estimator",
abstract = "Wideband large-scale array systems operating at millimeter-wave bands are expected to play a key role in future communication systems. It is recommended by standardization groups to use sphericalwave models (SWMs) to characterize the channel in near-field cases because of the large array apertures and the small cell size. However, this feature is not widely reflected in channel models yet, mainly due to the high computational complexity of SWMs compared to that of the conventional plane-wave model (PWM), especially when ultrawideband signals are considered. In this paper, a maximum likelihood estimator (MLE) of low computational complexity is implemented with a SWM for ultrawideband signals. The measurement data obtained from an ultrawideband large-scale antenna array system at 28-30GHz are processed with the proposed algorithm. The power azimuth-delay profiles (PADP) estimated from the SWM and the PWM are compared to those obtained from rotational horn antenna measurement, respectively. It shows that the multipath components (MPCs) are well-estimated with the proposed algorithm, and significant improvement in estimation performance is achieved with the SWM compared to the PWM. Moreover, the physical interpretation of the estimated MPCs is also given along with the estimated scatterers.",
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Channel Characterization for Wideband Large-Scale Antenna Systems Based on a Low-Complexity Maximum Likelihood Estimator. / Ji, Yilin; Fan, Wei; Pedersen, Gert F.

I: I E E E Transactions on Wireless Communications, Bind 17, Nr. 9, 8412215, 01.09.2018, s. 6018-6028.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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