Wireless grid can provide consumers ubiquitous broadband wireless services with convenience, robustness and mobility, which is one of the most promising alternatives of fixed wireless access networks. As the deployment of Wide City has accelerated quickly, this study focuses on the key technologies of wireless grid in ubiquitous broadband wireless services, such as antennas, MAC design, channel...

Wireless network technologies offer ubiquitous broadband access to millions of users at an affordable cost. However, the broadband nature of the wireless medium make these networks vulnerable to a number of attacks. Malicious interference at the physical layer, and extended packet collisions at the medium access layer can cause significant DoS attacks. In this work, we show how off-the-shelf ha...

Additional network complexity driven by the demand for new broadband services increases the need for network control and management signalling. This paper takes stock of this trend and suggests an approach within the context of IEEE P.1520 to separate signalling and associated broadband intelligent services from multimedia data transport so that each may be developed to their full potential. Th...

Internet access is intermittent and very expensive in remote areas in the developing world. The access is still mainly provided via satellite links to other continents and, although the transition to terrestrial networks has started, it will take time to reach the under-served areas. To understand the local needs and traffic patterns in rural areas, we have analyzed Internet web traffic logs ca...

The subject of B-ISDN came into being in the late 1980s, together with the concept of Asynchronous Transfer Mode (ATM). ATM is closely tied to high-speed packet switching by means of specialized switches implemented in hardware. Due to its high speed and packet structure, ATM technology was considered attractive to unify voice, data, and video services. A unification of these services over the ...

In this paper, we proposed a novel MIMO relaying system with phase control in the relay node. In this proposed scheme, we enhance the depleted eigenpath of MIMO E-SDM transmission. We indicate the effectiveness of proposed method through computer simulation.

INTRODUCTION OPTICAL transport technology has mainly been used for transport systems for long-haul transmission of large volumes of data between cities. As a consequence of the continuing conversion of network broadband access, however, optical transport technology is beginning to be applied to transmission within cities and to access systems for users. Optical access systems that perform optic...

The present thesis aims to study resource allocation techniques in fixed wireless networks in order to optimize their spectral efficiency as well as to investigate alternative broadband transfer methods. A brief overview of broadband wireless access networks with their characteristics is given and the fundamental resource management techniques proposed in the open technical literature are also ...

Current broadband applications provided to the enterprise require from increased speed, performance, degree of personalization, ubiquitous access and reliability. 4G broadband wireless systems and multihoming technologies provide a working framework where such challenges could be met. In the context of a user driven broadband multimedia service and heterogeneous multipleflow communication netwo...