Outdoor IEEE 802.11 cellular networks: radio link performance

Clark, M.V.; Leung, Kin K.; McNair, B.; Kostic, Z.

doi:10.1109/icc.2002.996906

Cited by 37 publications

(22 citation statements)

References 6 publications

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“…However, the implementation of the RAKE receiver has a significant impact on the performance. For example, [24] shows that high performance RAKE receivers can mitigate the impact of delay-spread, while less effective RAKE receivers will perform poorly when the delay-spread is large. Thus, it is difficult to make any conclusions about the effect of delay-spread on future mesh networks based on current receivers.…”

Section: H Delay Spreadmentioning

confidence: 99%

Realistic propagation simulation of urban mesh networks

Sridhara

Bohacek

2007

Computer Networks

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Simulation plays an important role in the verification of mobile wireless networking protocols. Recently several cities have either begun deploying or are completing plans to deploy large-scale urban mesh networks (LUMNets).On the other hand, the networking research community has little expertise in simulating such networks. While the protocols are simulated reasonably realistically, the propagation of wireless transmissions and the mobility of nodes are not. Today, simulations typically model propagation with either the free-space model or a "two-ray" model that includes a ground reflection. Such models are only valid in open space where there are no hills and no buildings. Since wireless signals at the frequencies used for mobile wireless networking are partly reflected off of buildings and partly is transmitted into the building, the presence of buildings greatly influences propagation.Consequently, the open-space propagation models are inaccurate in outdoor urban areas. Indoors, the open-space models are not even applicable. This paper presents guidelines for simulating propagation in such urban settings.Furthermore, extensive background discussion on propagation is also included. The techniques for propagation are validated against propagation measurements. The techniques discussed are implemented in a suite of tools that are compatible with protocol simulators and are freely available for use.

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Section: H Delay Spreadmentioning

confidence: 99%

Realistic propagation simulation of urban mesh networks

Sridhara

Bohacek

2007

Computer Networks

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“…An 802.11b outdoor cellular network was studied in [5]. The concept of a hyper-receiver was introduced in Wyner's Gaussian Cellular Multiple Access Channel (GCMAC) model [4].…”

Section: Related Workmentioning

confidence: 99%

Analyzing uplink capacity of partially overlapping channel based WLANs using a hyper-receiver

Majid

Imran

Hoshyar

2008

2008 IEEE International Symposium on Wireless Communication Systems

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Abstract-Spectrum allocation within the fixed unlicensed band affects performance of wireless networks. Fundamental limitations of spectral efficiency on capacity of wireless local area networks (WLANs) hence needs to be studied. Recently, it was shown that the performance can be increased when both nonoverlapping and partially overlapping channels are used. Unlike previous studies, this is the first known attempt on analysis of information theoretic capacity for partially-overlapping channels, as characterized by IEEE 802.11b-type systems using a hyperreceiver. Using Marcȇnko-Pastur Law distribution, capacity is approximated for such systems. We implement this by proposing a novel channel model for our analysis. The results conform to Monte Carlo simulations, with an approximate mean error of 5%. Fundamental tradeoffs of channel interference and power gain are discussed. We further explore the effect of access point density and find that systems based on partially overlapping channels perform well in high density deployments. We also compute capacity for a range of channel overlaps and conclude that for high density, rates close to capacity are achievable for a channel overlap of 90% and above.

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“…A number of studies have investigated the effects of the fiber delay on the DCF of 802.11 MAC protocol [2], [4], [5]. However, none of them have presented accurate analytical approximations to predict the performance of such systems when specific parameters of the network are available.…”

Section: Introductionmentioning

confidence: 99%

Performance Impairments in Single-Mode Radio-Over-Fiber Systems Due to MAC Constraints

Kalantari-Sabet¹,

Mjeku

Gomes

et al. 2008

J. Lightwave Technol.

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Abstract-This paper investigates performance impairments due to constraints imposed by the MAC layer when single-mode fiber (SMF) is used to extend the reach of an IEEE 802.11 network. It is shown that data throughput decreases as fiber length increases. It is also noted that the network fails long before physical layer limitations set in due to the timeout values defined within the MAC protocol. This study is based on both variants of the IEEE 802.11 Distributed Coordination Function. Moreover, both UDP and TCP packet transmissions are taken into account. An experimental enquiry is initially developed to provide a set of validation points before extending these results by simulations using the OPNET platform. Finally, an analytical approximation is presented to these results that allows designers of Radio-over-fiber (RoF) systems to quickly and accurately predict the data throughput given the specific parameters of their network. To our knowledge, this is the first analysis of this kind for a long reach fiber system.

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Outdoor IEEE 802.11 cellular networks: radio link performance

Cited by 37 publications

References 6 publications

Realistic propagation simulation of urban mesh networks

Realistic propagation simulation of urban mesh networks

Analyzing uplink capacity of partially overlapping channel based WLANs using a hyper-receiver

Performance Impairments in Single-Mode Radio-Over-Fiber Systems Due to MAC Constraints

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