Relationship Between Cross-Polarization Discrimination (XPD) and Spatial Correlation in Indoor Small-Cell MIMO Systems

Lim, Yeon-Geun; Cho, Yae Jee; Oh, TaeckKeun; Lee, Yong-Shik; Chae, Chan-Byoung

doi:10.1109/lwc.2018.2808346

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…A footprint smaller than 0.53λ min × 0.53λ min at 29.5 GHz is pursued for grating-lobefree beamsteering from -50 • to 50 • . In addition, the antenna element should exhibit a cross-polarization discrimination (XPD) larger than 20 dB over its entire frequency band [29]. Back radiation and mutual coupling should be reduced to the bare minimum to ensure good isolation from the integration platform and to guarantee blindspot-free beamsteering, resp.…”

Section: Antenna/array Design a Compact Antenna Elementmentioning

confidence: 99%

Cost-Effective High-Performance Air-Filled SIW Antenna Array for the Global 5G 26 GHz and 28 GHz Bands

Paula

Bosman

Brande

et al. 2021

Antennas Wirel. Propag. Lett.

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A cost-effective, compact and high-performance antenna element for beamforming applications in all 5G New Radio bands in the [24.25-29.5] GHz spectrum is proposed. The novel antenna topology adopts a square patch, an edge-plated air-filled cavity, and an hourglass-shaped aperture-coupled feed to achieve a very high efficiency over a wide frequency band in a compact footprint (0.48λ0 × 0.48λ0). Its compliance with standard PCB fabrication technology, without complex multi-layer PCB stack, ensures low-cost fabrication. The antenna feedplane offers a platform for compact integration of active electronic circuitry. Two different modular 1×4 antenna arrays were realized to demonstrate its suitability for broadband multi-antenna systems. Measurements of the fabricated antenna element and the antenna array prototypes revealed a -10-dB impedance bandwidth of 7.15 GHz (26.8%) and 8.2 GHz (30.83%), resp. The stand-alone antenna features a stable peak gain of 7.4 ± 0.6 dBi in the [24.25-29.5] GHz band and a measured total efficiency of at least 85%. The 1×4 array provides a peak gain of 10.1 ± 0.7 dBi and enables grating-lobe-free beamsteering from -50 • to 50 • .

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Section: Antenna/array Design a Compact Antenna Elementmentioning

confidence: 99%

Cost-Effective High-Performance Air-Filled SIW Antenna Array for the Global 5G 26 GHz and 28 GHz Bands

Paula

Bosman

Brande

et al. 2021

Antennas Wirel. Propag. Lett.

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“…As introduced in Oestges et al 5 and Lim et al, 6 DPA systems are mainly designed for the use in mmWave channel environments, in which transmitted electromagnetic waves are rarely reflected and may experience large signal strength attenuation. Hence, a DPA system should typically be deployed for a short‐range wireless service, such as indoor small cells.…”

Section: System Modelmentioning

confidence: 99%

“…Additionally, the sharp beamforming enabled by the M‐MIMO enhances the line‐of‐sight (LoS) component of the propagated signal. In such channel environments, signals emitted from a polarization antenna can maintain their polarization states until they reach the receiver 5‐7 . A dual‐polarization antenna (DPA) consists of two polarization antennas which are mutually orthogonal.…”

Section: Introductionmentioning

confidence: 99%

“…However, in mobile wireless communication environments, it is an inevitable problem that PRA mismatch occurs due to randomly varying PRAs of mobile terminals (MTs) 7,11 . The PRA mismatch characteristics of these MTs are mathematically formulated and established as a DPA channel model, 5,7 and it has been verified that this channel model reflects the practical DPA channel 6,7 …”

Section: Introductionmentioning

confidence: 99%

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Capacity improvement through selection diversity for dual‐polarized antenna systems

Wang

2020

Int J Communication

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SummaryIn newly developed wireless communication systems, the millimeter wavelength frequency band and massive‐MIMO‐based beamforming technology provide a channel environment that supports multiplexing transmission using dual‐polarization antenna (DPA). In such a channel environment, a DPA system can transmit two independent data streams using the two orthogonal polarizations. However, random rotation angle (PRA) mismatch between the transmitting and receiving DPAs causes interference in cross‐polarization antenna, which can degrade the DPA system capacity. To solve the PRA mismatch problem, selection diversity is utilized in this paper, and the capacity gain and PRA mismatch reduction achieved by the selection diversity are mathematically analyzed. Previously, performance analyses have not been conducted on the selection diversity in DPA systems considering the random PRA mismatch in the conventional studies. Through the result of this study, the improved capacity and PRA mismatch reduction of the DPA system can be accurately calculated as the number of mobile terminals (MTs) available increases. Based on this analysis, five practical scheduling schemes corresponding to various types of channel feedbacks are proposed, and their performance is evaluated.

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“…As drones are expected to communicate in swarms, carry 5G traffic, and be integrated in IoT applications [6,9], drone-based MIMO systems that offer higher throughput and more robust airborne links are becoming more attractive than ever [11][12][13]. However, it is well known that the capacity of these MIMO systems can be significantly reduced due to high spatial correlation of its channels [26,33]. The MIMO spatial correlation is known to largely depend on antenna spacing, radiation pattern and polarization; factors that are found to be crucial when modeling polarized MIMO [25][26][27][28] channels in 3D.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of Antenna Polarization and Elevation Effects on Drone Communications

Badi

Wensowitch

Rajan

et al. 2019

Proceedings of the 22nd International ACM Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems

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In the next wave of swarm-based applications, unmanned aerial vehicles (UAVs) need to communicate with peer drones in any direction of a three-dimensional (3D) space. On a given drone and across drones, various antenna positions and orientations are possible. We know that, in free space, high levels of signal loss are expected if the transmitting and receiving antennas are cross polarized. However, increasing the reflective and scattering objects in the channel between a transmitter and receiver can cause the received polarization to become completely independent from the transmitted polarization, making the cross-polarization of antennas insignificant. Usually, these effects are studied in the context of cellular and terrestrial networks and have not been analyzed when those objects are the actual bodies of the communicating drones that can take different relative directions or move at various elevations. In this work, we show that the body of the drone can affect the received power across various antenna orientations and positions and act as a local scatterer that increases channel depolarization, reducing the cross-polarization discrimination (XPD). To investigate these effects, we perform experimentation that is staged in terms of complexity from a controlled environment of an anechoic chamber with and without drone bodies to in-field environments where drone-mounted antennas are in-flight with various orientations and relative positions with the following outcomes: (i.) drone relative direction can significantly impact the XPD values, (ii.) elevation angle is a critical factor in 3D link performance, (iii.) antenna spacing requirements are altered for co-located cross-polarized antennas, and (iv.) cross-polarized antenna setups more than double spectral efficiency. Our results can serve as a guide for accurately simulating and modeling UAV networks and drone swarms.

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Relationship Between Cross-Polarization Discrimination (XPD) and Spatial Correlation in Indoor Small-Cell MIMO Systems

Cited by 11 publications

References 15 publications

Cost-Effective High-Performance Air-Filled SIW Antenna Array for the Global 5G 26 GHz and 28 GHz Bands

Cost-Effective High-Performance Air-Filled SIW Antenna Array for the Global 5G 26 GHz and 28 GHz Bands

Capacity improvement through selection diversity for dual‐polarized antenna systems

Experimental Evaluation of Antenna Polarization and Elevation Effects on Drone Communications

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