Wireless LAN design alternatives

Bantz, David; Bauchot, Frédéric

doi:10.1109/65.272940

Cited by 91 publications

(18 citation statements)

References 9 publications

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“…Wireless is an attractive alternative. However, design of a wireless network in large buildings is still a difficult task [1], [2] due to the nature of an indoor propagation [3], [4]. As an alternative, existing infrastructures, such as powerlines [5], [6] or phonelines [7], can be used for data communications.…”

mentioning

confidence: 99%

Propagation model for the HVAC duct as a communication channel

Никитин

Stancil

Cepni

et al. 2003

IEEE Trans. Antennas Propagat.

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Abstract-Heating, ventilation, and air conditioning (HVAC) ducts in buildings are typically hollow metal pipes which can be used as waveguides to carry signals and provide the network access to offices. Knowledge of channel properties is crucial to designing such a communication system. This paper presents a propagation model for a straight HVAC duct terminated at both ends. At high frequencies this duct behaves as a multimode waveguide with a transmitting antenna coupling in and a receiving antenna coupling out. We derive a simple analytical expression for the frequency response of this channel using conventional techniques. Experimental data taken on real circular ducts excited by monopole probe antennas confirm theoretical results. This model represents an initial step toward the development of a tool for planning a wireless distribution system using building HVAC ducts.

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mentioning

confidence: 99%

Propagation model for the HVAC duct as a communication channel

Никитин

Stancil

Cepni

et al. 2003

IEEE Trans. Antennas Propagat.

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“…Comparison of the above two WLAN topologies yields several di!erences [7]. However, most of these results stem from the assumption that ad hoc WLANs utilize contention MAC protocols (e.g.…”

Section: Wireless Lan Topologiesmentioning

confidence: 86%

Design alternatives for wireless local area networks

Nicopolitidis

Papadimitriou

Pomportsis

2001

Int J Communication

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SUMMARYIn this paper an overview of the wireless local area network (LAN) area is provided. The two types of wireless LAN topologies used today, infrastructure and ad hoc, are presented. The requirements that a wireless LAN is expected to meet are discussed. These requirements impact on the implementation of both the Physical and MAC layer of a wireless LAN. The unique characteristics of wireless physical layers are discussed and the "ve technology alternatives used today are presented. MAC layer issues are discussed and the two existing standards, IEEE 802.11 and HIPERLAN 1, are examined. Pollingbased MAC protocols (RAP, GRAP) are also reviewed. Finally, an introduction is made to wireless technologies that interact with WLANs, such as personal area networking (PAN) and wireless ATM and an overview of HIPERLAN 2, a WLAN using ATM technology, is provided.

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“…The packet will be dropped at N rx 4) N tx Exposed : N tx does not try to transmit even though a transmission would be successfully received at N rx The presence of problem nodes in a network can significantly decrease the throughput achieved by a node; the analytical model aims to maximize throughput by minimising the presence of hidden and exposed nodes. The model shows that the optimum PCS range is given by (9).…”

Section: Interference Type Solutionmentioning

confidence: 99%

“…A link distance based rate assignment mechanism was developed to attempt to equalize the interference range for all links. The motivation for this was to exploit the findings of the analytical model (9). Test were conducted to examine the performance of the default and the optimum PCST.…”

Section: Interference Type Solutionmentioning

confidence: 99%

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A Survey of Adaptive Carrier Sensing Mechanisms for IEEE 802.11 Wireless Networks

Thorpe

Murphy

2014

IEEE Commun. Surv. Tutorials

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Abstract-This survey provides a comprehensive review of existing physical carrier sensing enhancements for IEEE 802.11 wireless networks. The original physical carrier sensing mechanism, used by wireless stations to gain access to the medium, is limited. Consequently, IEEE 802.11 networks are vulnerable to the presence of hidden and exposed nodes. Such nodes can significantly decrease system performance by increasing the collision rate and decreasing the channel spatial reuse. The value of the physical carrier sensing threshold is a key factor influencing the presence of hidden and exposed nodes in a wireless network. Several enhancements have been proposed in the literature, which attempt to mitigate the loss in performance caused by the limited carrier sensing. Firstly, the notion of an optimum carrier sensing threshold has been studied, and results indicate that it can be tuned to an optimum value. Building on the positive early results, further work was performed to develop mechanisms that dynamically adjust the threshold according to varying network conditions. This article presents an in-depth survey of the existing literature in the area, detailing the various approaches and their efficacy in addressing the problem of hidden and exposed nodes (and consequently increasing performance). It offers a comparison of the techniques, by evaluating the models, limitations, assumptions, and performance gains.

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Wireless LAN design alternatives

Cited by 91 publications

References 9 publications

Propagation model for the HVAC duct as a communication channel

Propagation model for the HVAC duct as a communication channel

Design alternatives for wireless local area networks

A Survey of Adaptive Carrier Sensing Mechanisms for IEEE 802.11 Wireless Networks

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