WiMAX based on IEEE std 802.16 is believed one of the important technologies of 4G. It aims to provide high-speed access over distance of several to tens kilometers. In IEEE std 802.16-2004, WiMAX defines an optional mesh mode, with which multihop, multi-route, self-organizing and selfhealing communications can be achieved in metropolitan-level areas. This chapter presents medium access control...

Wireless Mesh Networks represent a good solution to offer Internet access in sparse population areas. The latest wireless technologies, such as WiMAX, offer high data rates services, but they are not designed for wireless mesh architectures. This paper proposes a wireless mesh solution based on WiMAX nodes equipped with smart antennas, and presents some tests for performance evaluation of the p...

WiMAX(worldwide interoperability for Microwave Access) networks are the networks which are responsible for providing many services like video, data and voice. The WiMAX technology satisfies the modern need of broadband internet through wireless access. For managing all these services through WiMAX, IEEE802.16 gives QOS (Quality of Service) parameter. In WiMAX, a fundamental challenge is to achi...

51 In recent years, increasing attention has been paid to the IEEE 802.16 family of wireless local and metropolitan area network (LAN/MAN) standards and its potential to change the field of telecommunications operations and business models. Along with the WiMAX Forum extensions that define an end-to-end architecture, this wireless LAN/MAN technology emerges as a potent proposal for building nex...

The IEEE 802.16e-2005 standard, also denoted as mobile WiMAX, was introduced as one of the first real efforts towards the deployment of fourth generation communication systems providing fixed and mobile broadband wireless access. Mobile WiMAX supports multiple input multiple output (MIMO) antenna techniques which are considered a key technology in wireless communication systems for increasing b...

A useful tool in the design of reliable digital communication systems is channel coding. Turbo codes have been shown to yield an outstanding coding gain close to theoretical Shannon limit in the Additive White Gaussian Noise (AWGN) channel. This is due to relatively large coding gains that can be achieved. Over the past decade, turbo codes have been widely considered to be one of the most power...

Anurag Kumar , Vishal Kumar , Jaydeep Kishore [3] [1] [2] Department of Computer Science & Engineering, BTKIT, Dwarahat, INDIA [3] Department of Computer Science & Engineering, SIT, Pithoragarh, INDIA [email protected], [email protected], [email protected] __________________________________________________________________________________________ Abstract: In the present scenario, ne...

The WiMAX technology offers a versatile mobile services platform, which enables operators to provide differential Quality of Service (QoS) for fulfilling subscribers’ various requirements. WiMAX operators need to allocate enough resources to make all subscribers satisfied to avoid “user churn” that subscribers will unsubscribe services due to dissatisfaction with allocated resources. This resou...

In this paper we study the factors influencing system bandwidth capacity in IEEE 802.16e networks. Additionally, we investigate and evaluate the system capacity of 802.16j in order to understand how the relay architecture can lead to capacity increases in the downlink. An analytical study of the WiMAX propagation channel by using Cost-231 Hata Model is presented. This model performed in differe...

Link adaptation is a process of paramount importance to optimize the performance of wireless communication systems. However, standardization committees have not standardized link adaptation procedures in order to foster competitiveness among vendors. As a consequence, many research projects have been conducted on this field and several strategies have been presented and tested, mainly for High ...