Spurious Beam Suppression in Dual-Beam Phased Array Transmission by Impedance Tuning

Rodriguez-Garcia, Pedro; Sifri, Jack; Calabrese, Caleb; Goad, Adam; Baylis, Charles; Marks, Robert J.

doi:10.1109/taes.2022.3182638

Cited by 6 publications

(1 citation statement)

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“…Unfortunately, due to the imperfect roll-off of practical antenna beams, inter-cell interference (ICI) is introduced, and is worsened by the limitations of the array beamforming technique [8]. Furthermore, as the elevation angle of beams referenced at boresight [9] reduces, the resulting cell footprints broaden, thereby increasing both cell overlap [10] and ICI. These affect the achievable coverage and capacity, especially at the edge of the HAP extended coverage area.…”

Section: Introductionmentioning

confidence: 99%

Extending Coverage and Capacity from High Altitude Platforms With A Two-tier Cellular Architecture

Arum

Grace

Mitchell

2023

IEEE Trans. on Mobile Comput.

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Conventional coverage and capacity from a high altitude platform (HAP) over an extended coverage area suffer significantly from inter-cell interference (ICI), antenna beam broadening, and uneven cell loading, which results in poor edge performance. In this paper, we show how a single antenna array on a HAP can be used to mitigate against these and achieve ubiquitous coverage by forming two tiers of a homogeneous contiguous cellular structure. We propose separate algorithms that implement the two-tier architecture with many antenna beams, which are used to form cells, and associate users with an appropriate cell and tier. A user associates with the cell and tier, which offer the best carrier power-to-noise ratio (CNR) and carrier power-to-interference-plus-noise ratio (CINR) respectively. The performance of the architecture, which is evaluated using simulation, is compared with a typical one-tier architecture. The results show that the two-tier architecture achieves over 30% higher user throughput and enhances throughput fairness and edge-of-cell connectivity by centralising as many users as possible within cells compared to the typical one-tier architecture. These benefits are better exploited by ensuring spectrum orthogonality between the two tiers.

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Section: Introductionmentioning

confidence: 99%