The special issue consists of four papers addressing recent state-of-the-art research of wireless communication and networking technologies, which is timely and valuable for future analysis, implementation and experiments. The first two papers propose efficient and secure routing algorithms for wireless sensor networks. In the first paper ‘‘A Dynamic-Clustering Reactive Routing Algorithm for Wi...

Abstract-The main objective of this paper is to compare block transmission system performance analytically for Code Divisional Multiple Access (CDMA) modulations in Generalized Multicarrier environment against linear modulation techniques for both single user and multiuser. The effectivity of GMC-CDMA for multiuser will also be judged for different Direct Sequence CDMA (DS-CDMA) such as MC-CDMA...

In the new era of wireless communication, Wireless Local Area Network has emerged as one of the key players in the wireless communication family. It is now a trend to develop the WLAN in various colleges and office campuses for increasing productivity and quality of goods. There are many obstacles when deploying WLAN, which demands seamless indoor handover. The objective of the work reported he...

1. INTRODUCTION With the enormous growth of computer-based terminals, the demands for indoor network which enable us to transmit and share digital information have been rapidly increased. As a method to form indoor office/home network, wireless LAN (WLAN) systems have taking a great attention, as they provides attractive features such as an ease of network constructions, a flexibility of networ...

A class of generalized multicarrier direct sequence code-division multiple-access (MC DS-CDMA) schemes is defined and its performance is considered over multipath Nakagamifading channels. The spacing between two adjacent subcarriers of the generalized MC DS-CDMA is a variable, allowing us to gain insight into the effects of the spacing on the bit error rate (BER) performance of MC DS-CDMA syste...

1 CDMA Concept 4 1.1 Basic Principles of Spread Spectrum . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1 Direct Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1.2 Frequency Hopping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1.3 Time Hopper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1.4 Hybrid Systems . ....

Since the first commercial service of Code-Division Multiple-Access (CDMA)-based digital cellular service in 1996, cell phones have become an essential part of every Korean individual's life. As of December 2003, there are over 33 millions mobile phone subscribers, which represent 68.7% of the whole Korean population. Meanwhile, during the last 5 years or so, Korea also has witnessed astonishin...

زۆربەى لێکۆڵينەوەکان کە لە سەر ناوچەى ئاکرێ نووسراون زیاتر لایەنەکانى سیاسى و کارگێڕى سەربازى دەگرێتەوە, کاتێکدا بوارە گرنگەکانى ديكه‌ى ژیان فەرامۆش کراون، بە تایبەتى لایەنى ئابوورى نێویشيدا بوارى کشتوکاڵ زەورى زار، پەیوەندى راستەوخۆى لەگەڵ ژیانى مروڤدا هەیە, سەرەڕاى ئەمەش لەچاو کەمتر بایەخى پێ دراوە, بۆیە پێمان باش بوو لەسەر ئەم بابەتە بنووسين. ئامانجى سەرەکیشمان ئەوەیە بەم لێکۆڵینەوە لایەنێکى...

The integration of WLANs and 3G networks has recently attracted much attention. To support seamless service between 3G and WLAN networks, low latency access control mechanisms of the two networks are highly required. This work presents a novel access control mechanism, which aims to support seamless services for an integrated 3G-WLAN network. The proposed method, based on a loose coupling archi...