Optical wireless communications offer a viable alternative to radio frequency (RF) communication for indoor use and other applications where high performance links are needed. These systems use infrared technology (IR), which has significant advantages over RF. This paper presents a review of the most significant issues related to infrared communication technology, which will enable the realiza...

Locator@CMU is a centralized wireless location service that provides information on all connected 802.11 devices on Carnegie Mellon’s Wireless Andrew network. The basic architecture and functionality of this service are presented. In addition the implementation of a location-based application is discussed. The results are presented in the context of a new location-based service that allows for ...

This research project will analyze a large (n=98,000) dataset of wireless access points in two medium-sized US cities to examine changes in the use of encryption in 802.11 wireless networks over time. Further, changes in the use of encryption in these networks based on the socio-economic status of the network owner, and based on whether the owner is a business or an individual will be investiga...

Wireless mesh network is an advanced form of wireless network. Wireless Mesh networks is the key technology for represent an emerging wireless networking technology that promises wider coverage than traditional wireless LANs and lower development and operation cost than 3G cellular networks. Wireless mesh networks can be implemented with various wireless technologies including IEEE 802.11. Rout...

The perceived lack of security in the wireless environment has delayed many initiatives in providing access to ecommerce applications from wireless devices. Many organizations are skeptical that the same kind of security protections that they are used to in the current Internet (wired) e-commerce environment are also available for wireless transactions. In this paper we will show that these per...

In this paper, we propose a stochastic bursty-link model to simulate bursty behavior observed in wireless communications. Our stochastic bursty-link model works at the frame level where the probability of correctly receiving a frame is dependent on the results of previous transmissions. To accomplish this, our model uses a bursty probability adjustment function to adjust the probability of corr...

Wireless Mesh Networks (WMNs) are gaining wide popularity as a flexible and cost-effective alternative to the traditional set of disjointed IEEE 802.11 Access Points (APs). Their all-wireless infrastructure is in fact suitable for both residential premises and for hardly accessible places. As a consequence, many companies have already put on the market their own WMN solutions. Yet, though most ...

providing a high-quality service for transmission and playing real-time voice conversations (voice streaming) over wireless ad-hoc networks is no mean feat. buffering together with adjusting the playout time of the packets is a receiver-side solution to overcome this challenge. in this paper, a new adaptive playout adjustment algorithm is proposed to stream the voice conversations over wireless...

If you think a promiscuous client is a scantily-dressed customer, you're in trouble. And I'm not talking about having an affair. Think an evil twin is a horror-movie villain? Wrong again. The horror you should be bracing yourself for is not on the silver screen — and it's not from a rolling pin flung at you from across the kitchen, for that matter. Rather, the trouble is in the airwaves and tar...

Many appealing multicast services such as on-demand TV, teleconference, online games and etc. can benefit from high available bandwidth in multi-radio multi-channel wireless mesh networks. When multiple simultaneous transmissions use a similar channel to transmit data packets, network performance degrades to a large extant. Designing a good multicast tree to route data packets could enhance the...