User and business perspectives on an open mobile access standard

Luediger, H.; Zeisberg, S.

doi:10.1109/35.868156

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…direct path always falls in the first bin in all the PDPs. 5 It also turns out that the direct path was always the strongest path in the 14 SSA-PDPs even if the LOS is obstructed. The energy of the subsequent MPCs decay exponentially with delay starting from the second bin.…”

Section: A the Large-scale Statisticsmentioning

confidence: 95%

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The ultra-wide bandwidth indoor channel: from statistical model to simulations

Cassioli

Win

Molisch

2002

IEEE J. Select. Areas Commun.

816

519

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We establish a statistical model for the ultra-wide bandwidth (UWB) indoor channel based on an extensive measurement campaign in a typical modern office building with 2-ns delay resolution. The approach is based on the investigation of the statistical properties of the multipath profiles measured in different rooms over a finely spaced measurement grid. The analysis leads to the formulation of a stochastic tapped-delay-line (STDL) model of the UWB indoor channel. The averaged power delay profile can be well-modeled by a single exponential decay with a statistically distributed decay constant. The small-scale statistics of path energy gains follow Gamma distributions whose parameters are truncated Gaussian variables with mean values and standard deviations decreasing with delay. The total received energy experiences a lognormal shadowing around the mean energy given by the path-loss power law. We also find that the correlation between multipath components is negligible. Finally, we propose an implementation of the STDL model and give a comparison between the experimental data and the simulation results.

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Section: A the Large-scale Statisticsmentioning

confidence: 95%

“…6. Applying the same 5 According to the bin's width in the delay domain, we can only resolve the MPCs arriving at differential delay greater than 2 ns. Thus, even if more than one path arrives within the bin, we refer to the content of each bin as one MPC.…”

Section: A the Large-scale Statisticsmentioning

confidence: 99%

The ultra-wide bandwidth indoor channel: from statistical model to simulations

Cassioli

Win

Molisch

2002

IEEE J. Select. Areas Commun.

816

519

View full text Add to dashboard Cite

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“…Private users are also using the technology to avoid new wires in their homes and sometimes to share Internet access with other users. An increasing number of telecommunication operators and visionary companies have identified new business models for the deployment of public WLAN access at popular locations (Hot-Spots) or in their business premises [5]. As a single example close to the authors, the Swiss operator Swisscom Mobile has launched commercial services based on public WLAN Hot-Spot access based on GSM subscriptions or special value cards since the end of 2002 2 .…”

Section: Channel Allocation In Wlan Networkmentioning

confidence: 99%

“…The agent then sends the new channel to the neighboring agents (4). The receiving agent reads the message contents, makes sure that it fits the AWM ontology and in turn activates the optimization algorithm if necessary (5) to compute the new channel based upon the updated information. Finally, the new channel is assigned by means of a SNMP request (6).…”

Section: Fig 1 Awm Agent Architecturementioning

confidence: 99%

Towards Adaptive WLAN Frequency Management Using Intelligent Agents

Gamba

Wagen

Rossier

2003

Ad-Hoc, Mobile, and Wireless Networks

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Private, corporate and public Wireless Local Area Networks (WLAN) Hot-Spots are emerging. In this rapidly evolving environment, the configuration of WLAN access points raise the classical problem of re-using limited radio resources. In this paper, the problem of dynamic frequency allocation of WLAN access point in a highly competitive multi-provider Hot-Spots environment is addressed. Our solution aims at working in locations where planned and ad-hoc deployments might be side by side. An on-line adaptive optimization process is proposed and relies on available information delivered only by the local access points in order to maintain the quality of service as high as possible. This optimization process is implemented on a scalable and highly flexible agent-based framework. The easy deployment of intelligent agents in a real WLAN network and their integration in a simulation context allows us to perform extensive tests for small and large-scale networks. The proposed approach has been tested on a limited but practical demonstrator that showed encouraging results.

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“…Due to the success of the different prototypes and demonstrations, there is big effort to standardize UWB-based communication systems for both military and civil applications (see [1], [5] and the references therein).…”

Section: Introductionmentioning

confidence: 99%

SC-FDE with soft packet combining ARQ techniques for interference-limited UWB systems

Dinis

Montezuma

Martins

2009

2009 3rd International Conference on Signal Processing and Communication Systems

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SC-FDE (Single-Carrier with FrequencyDomain Equalization) together with soft packet combining ARQ techniques (Automatic Repeat reQuest) was shown to be effective for broadband wireless systems with deep fading effects such as those inherent to shadowing. However, they are not suitable to cope with strong interference effects, especially when the channel remains fixed.In this paper, we consider UWB (Ultra Wide Band) systems employing SC-FDE techniques in the presence of strong interference signals that occupy a significant part of the transmission band and we propose suitable soft combining ARQ schemes. Our techniques are able to cope with strong interference levels as well as deep fading, even for fixed channels. 1

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User and business perspectives on an open mobile access standard

Cited by 10 publications

References 3 publications

The ultra-wide bandwidth indoor channel: from statistical model to simulations

The ultra-wide bandwidth indoor channel: from statistical model to simulations

Towards Adaptive WLAN Frequency Management Using Intelligent Agents

SC-FDE with soft packet combining ARQ techniques for interference-limited UWB systems

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