On the connectivity of wireless networks with multiple directional antennas

Xu, Huiwen; Dai, Hong-Ning; Zhao, Qinglin

doi:10.1109/icon.2012.6506551

Cited by 5 publications

(6 citation statements)

References 24 publications

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“…The reason lies the fact that using directional antennas in wireless networks can establish some long links to connect the nodes that are far away and even out of the transmission range of an isotropic antenna. This result further confirms the results [8]- [10].…”

Section: A Connectivity Comparison With Uca Antenna Isotropic Antensupporting

confidence: 82%

“…Recently, many studies [4]- [10] show that using directional antennas instead of omni-directional antennas in wireless ad hoc networks can significantly improve the network performance (particularly for the network connectivity). The performance improvement mainly owes to the reduction in the interference from undesired directions and the extension in the transmission range because directional antennas concentrate radio signals on the desired directions.…”

Section: Introductionmentioning

confidence: 99%

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Connectivity of Wireless Ad Hoc Networks: Impacts of Antenna Models

Wang

Dai

Zhao

2013

2013 International Conference on Parallel and Distributed Computing, Applications and Technologies

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Abstract-This paper concerns the impact of various antenna models on the network connectivity of wireless ad hoc networks. Existing antenna models have their pros and cons in the accuracy reflecting realistic antennas and the computational complexity. We therefore propose a new directional antenna model called Approx-real to balance the accuracy against the complexity. We then run extensive simulations to compare the existing models and the Approx-real model in terms of the network connectivity. The study results show that the Approx-real model can better approximate the best accurate existing antenna models than other simplified antenna models, while introducing no high computational overheads.

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Section: A Connectivity Comparison With Uca Antenna Isotropic Antensupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Connectivity of Wireless Ad Hoc Networks: Impacts of Antenna Models

Wang

Dai

Zhao

2013

2013 International Conference on Parallel and Distributed Computing, Applications and Technologies

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“…This was analytically pushed down to 2 in [20] where it was also shown that this number is independent of the small-scale fading model used. Finally, the possibility of using multi-directional antennas was proposed and studied in [21], and although unmotivated, was reported to enhance connectivity at low path loss.…”

Section: Introductionmentioning

confidence: 99%

Connectivity of Confined 3D Networks With Anisotropically Radiating Nodes

Georgiou

Dettmann

Coon

2014

IEEE Trans. Wireless Commun.

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Abstract-Nodes in ad hoc networks with randomly oriented directional antenna patterns typically have fewer short links and more long links which can bridge together otherwise isolated subnetworks. This network feature is known to improve overall connectivity in 2D random networks operating at low channel path loss. To this end, we advance recently established results to obtain analytic expressions for the mean degree of 3D networks for simple but practical anisotropic gain profiles, including those of patch, dipole and end-fire array antennas. Our analysis reveals that for homogeneous systems (i.e. neglecting boundary effects) directional radiation patterns are superior to the isotropic case only when the path loss exponent is less than the spatial dimension. Moreover, we establish that ad hoc networks utilizing directional transmit and isotropic receive antennas (or vice versa) are always sub-optimally connected regardless of the environment path loss. We extend our analysis to investigate boundary effects in inhomogeneous systems, and study the geometrical reasons why directional radiating nodes are at a disadvantage to isotropic ones. Finally, we discuss multi-directional gain patterns consisting of many equally spaced lobes which could be used to mitigate boundary effects and improve overall network connectivity.

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“…This assumption applies for all the above three scenarios. In addition, we also assume that the orientation of either a simplistic directional antenna in Scenario (ii) or a realistic directional antenna in Scenario (iii) is randomly chosen from a uniform distribution on the interval [0, 2π] (similar to [15], [17]). We then analyze the eavesdropping activities under the above three scenarios.…”

Section: B Eavesdropping Model 1) Channel Modelmentioning

confidence: 99%

Eavesdropping security in wireless ad hoc networks with directional antennas

Wang

Dai

Zhao

2013

2013 22nd Wireless and Optical Communication Conference

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Abstract-The eavesdropping security of wireless ad hoc networks has attracted considerable attention recently. However, most of current studies only consider OMN networks, where each node is mounted with a single omni-directional antenna, which radiates radio signals in all directions and consequently leads to the high eavesdropping possibility. Compared with an omnidirectional antenna, a directional antenna can concentrate the radio signals on some desired directions so that it can potentially reduce the eavesdropping possibility. This paper investigates the eavesdropping security of wireless ad hoc networks equipped with directional antennas. In particular, we study the eavesdropping possibility of OMN networks, SDA networks in which each node is equipped with a simplistic directional antenna and RDA networks in which each node is equipped with a realistic directional antenna. More specifically, we identify the eavesdropping activity in wireless networks and propose an eavesdropping model to measure the eavesdropping possibility. We conduct extensive simulations to evaluate the eavesdropping possibility of OMN networks, SDA networks and RDA networks with considering various environment factors, such as path loss attenuation and shadowing effects. Our simulation results show that using a simplistic directional antenna or a realistic antenna in wireless networks can reduce the eavesdropping possibility.

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On the connectivity of wireless networks with multiple directional antennas

Cited by 5 publications

References 24 publications

Connectivity of Wireless Ad Hoc Networks: Impacts of Antenna Models

Connectivity of Wireless Ad Hoc Networks: Impacts of Antenna Models

Connectivity of Confined 3D Networks With Anisotropically Radiating Nodes

Eavesdropping security in wireless ad hoc networks with directional antennas

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