Since WLAN (Wireless LAN: IEEE802. 11b) systems shares the 2.4 GHz frequency band with microwave ovens, interference caused by the radiated noise from the ovens is a serious problem. This paper proposes the use of adaptive filters to suppress the microwave oven interference in DS-SS (Direct Sequence Spread Spectrum) WLAN links. This method is based on the fact that an oven noise can be regarded...

This paper considers the realization of fiber-wireless (Fi-Wi) networks using the gigabits passive optical network (GPON) and the infrastructure-based wireless local area network (WLAN). The bottleneck of such hybrid system is the WLAN where interference limits the performance. As such, we focus on enhancing the WLAN performance by analytically deriving the optimum contention window (CW) sizes ...

With the increasing use of mobile computing devices such as Personal Digital Assistants (PDA), and an expansion of Wireless Local Area Networks (WLAN), there is growing interest in an indoor Wireless Positioning Systems (WPS) based on WLAN infrastructure. This paper describes a WPS that uses the signal strength of WLAN transmissions from/to WLAN Access Points to determine the position of the mo...

A wireless network (WLAN) provides unique challenges to system design. A WLAN uses a shared and highly unreliable medium, where protocols must rely on precise timing of requests and responses to detect submission errors and priorities among network nodes. In addition, WLAN stations are often embedded and have tight constraints on power, costs, and performance. To design WLAN nodes, precise esti...

Voice over IP (VoIP) over WLAN (VoWLAN) is an important application for public and private WLANs. However, VoWLAN systems suffer from several technical challenges such as power consumption of a WLAN station (STA) and service capacity of an access point (AP), making the commercial deployment of a large-scale VoWLAN service problematic. This study presents a cross-layer and energy-efficient mecha...

Wireless body area networks (WBANs) in the industrial, scientific, and medical (ISM) bands have been increasingly adopted for various medical applications. Due to the shared nature of the ISM bands, when a WBAN coexists with a wireless local area network (WLAN), performance of WBAN may significantly degrade because of asymmetric attributes between WBAN and WLAN such as transmit power and respon...

It is envisioned that multiple radios may be integrated into a single portable device in the near future. Such multi-radio devices may participate in multiple networks at the same time. In this paper, we consider a 802.11 WLAN network that shares a common set of multi-radio devices with another network, say CO-NETWORK, and we discuss WiMAX as one example of CONETWORK. One multi-radio device may...

This paper aims at providing a graphical user interface for WLAN monitoring and management system “WLAN Inspector”, which gives network operators the software and performance management tools necessary to monitor and manage network availability, achieve real-time monitoring (7 × 24 hours) and intelligent management, report on IP networks performance, and troubleshoot issues through a single Web...

In wireless local area network (WLAN) environment with independent user fading, at least one user is likely to undergo very good channel state at any time, and this is called multiuser diversity. For high system performance, a transmission scheduler at the LLC layer is required to exploit this multi-user diversity by opportunistically selecting a feasible user with a good channel, and it is ref...

Here we present the end-to-end QoS mechanism in 3G-multiaccess network environment. As multi-access wireless WLAN and wired xDSL wideband multi-access technologies has emerge and become more popular a need for interoperability with different technologies and domains has become necessity. There is also a need for end-to-end QoS management. We show a scenario where the UE-GGSN connection is cover...