We evaluated the electromagnetic-interference characteristics of MIMO (Multiple Input Multiple Output ) WLAN (Wireless Local Aria Network) by using an opened PW (Parallel Wired) cell that was placed in a radio anechoic chamber. We used two types of the interference wave such as the narrowband AM (Amplitude Modulation) wave specified by the IEC 61000-4-3 standards and the broadband communication...

This paper presents a channel preemption model for vertical handoff in heterogeneous WLAN (wireless LAN) embedded cellular networks. The novelty of this paper is right in that a newly initiated mobile node (MN) outside the WLAN coverage can preempt the channels occupied by an MN inside the WLAN coverage when the cellular channels are completely used up. The channel preempted MN is forced to swi...

In this paper, we propose a medium access control (MAC) protocol to allow a radio over fiber-based wireless local area network (RoF-based WLAN) to coexist with legacy carrier sense multiple access with collision avoidance (CSMA/CA)-based WLANs. In RoF-based WLANs, there are long propagation delays between access points (APs) and stations (STAs). When an RoF-based WLAN uses the conventional CSMA...

Mobility in modern distributed systems is a vital feature though it brings up such problems as unforeseeable disconnections while crossing the boundaries of wireless cells or networks. Due to the limited coverage and the lack of co-operation between different networks, seamless switching between different networks becomes extremely difficult. This paper addresses the problem of accidental or in...

Voice-over-IP (VoIP) has rapidly gained popularity in the last years, especially on smartphones platforms. In fact, WLAN chip-sets are becoming more common on smartphones, allowing users to use VoIP services from their mobile devices. On the other hand, the excessive energy consumption of the WLAN chip-set, limits the widespread use of VoIP on mobile phones. As most of the energy is spent when ...

In recent years WLAN is projecting itself as alternate solution to carry out enterprise’s network traffic. The basic mode of WLAN is classified as ad-hoc mode and infrastructure mode. Infrastructure mode use wired network as backbone. The enterprise WLAN network design preferred infrastructure mode which assume as extension to wired network. The wireless access point is major component of infra...

Wireless networks have been rapidly integrated with the wired Internet and have been widely deployed. In particular, IEEE 802.11b WLAN is the most widespread wireless network today. The IEEE 802.11b WLAN supports multiple transmission rates and the rate is chosen in an adaptive manner by an auto rate control algorithm. This auto rate control algorithm deeply affects the total system performance...

Third-generation cellular systems will provide wide coverage and nearly universal roaming, but will not realistically live up to the bit rate expectations placed on them. On the other hand, WLAN systems already offer bit rates surpassing those of 3G systems, but are often found lacking with respect to roaming and mobility support. In short, WLAN systems are great for hot spot coverage, while 3G...

A major challenge for the WLAN technology stems from having to share the 2.4 GHz ISM band with other wireless devices such as Bluetooth radios. The main goal of this paper is to investigate the use of techniques to mitigate the effects of interference for Bluetooth and WLAN and discuss the resulting performance trade-offs. We compare the performance of the Bluetooth and WLAN systems and evaluat...

Electromagnetic interference (EMI) can affect various medical devices. Herein, we report the case of EMI from wireless local area network (WLAN) on an electrocardiogram (ECG) monitoring system. A patient who had a prior myocardial infarction participated in the cardiac rehabilitation program in the sports medicine center of our hospital under the wireless ECG monitoring system. After WLAN was i...