IEEE 802.11 is the most important standard for wireless local area networks (WLANS). This paper presents a performance evaluation of IEEE 802.11 Distributed Coordination Function (DCF) in a multi-rate WLAN. We studied how throughput and delay varies with the distance of transmission in a multi-rate WLAN and the result was used to compare that of single rate WLAN. From the analysis it was observ...

The evolution and successful deployment of wireless LANs (WLANs) worldwide has yielded a demand to integrate them with third generation (3G) mobile networks. The key goal of this integration is to develop heterogeneous mobile data networks, named as beyond 3G (B3G) networks, capable of supporting ubiquitous computing. Currently, the network architecture (3rd Generation Partnership Project [3GPP...

We present the design and implementation of a protocol for supporting Wireless LAN (WLAN) roaming federations. Unlike existing approaches, which incur significant management overhead, our protocol is designed specifically with reducing management complexity in mind. More specifically, the next generation operators that oversee our WLAN federations are not involved in WLAN provisioning decisions...

Against to the presence of high complexity, low accuracy and a smaller range of positioning in traditional positioning technologies (WLAN, RFID and visual positioning technology), it presents the multi-information fusion positioning technology. The technology takes full advantage of WLAN, RFID and visual positioning technology which chooses Kalman filter for WLAN and RFID information fusion loc...

Modern wireless and mobile communication systems requires antenna which should have light weight, low profile, low cost, and easy to be integrated with RF devices. This demand is completed by microstrip antennas. This paper presents rectangular microstrip patch antenna for WLAN applications designed using IE3D software. The microstrip antenna is designed with dielectric substrate as Rogers RT/d...

In this paper, we investigate the use of adaptive techniques to mitigate interference for Bluetooth systems in the presence of WLAN direct sequence spread spectrum devices. We consider two different techniques that attempt to avoid time and frequency collisions of WLAN and Bluetooth transmissions. We conduct a comparative analysis of their performance for several dynamic scenarios where the WLA...

The integrated network provides the diverse application to the user. WiMAX is the most promising high speed broadband access with full QoS and WLAN provides high data rate at low cost, for limited coverage area. Integrated WiMAX-WLAN network can be capable of providing ubiquitous connectivity and high data rate to the end user. This paper focuses on the comparative performance analyzing of inte...

How can we obtain realistic mobility models? This has been a question that many researchers have attempted to answer, mostly by analyzing existing WLAN traces. But in the future, will user on-line behavior change with the introduction of new mobile services and devices? We aim to investigate this issue in our study. In this paper, we analyze the mobility of a subset of users different than the ...

Received Signal Strength based (RSS) horizontal handoff algorithms have been most commonly used by nearly all second generation and third generation wireless networks in a homogeneous environment. Vertical handoffs or network selection algorithms are the terms coined due to integration and interoperability of existing wired and wireless access networks under the umbrella called as 4G. This work...

WLAN has been widely deployed over public and private areas in recent years and has become one of the most popular access technologies for mobile Internet services. Handoffs between WLAN access points (APs) that introduce packet loss and delay during a network session is one of the critical issues for real-time communication services. Unfortunately, most of the previous studies in reducing hand...