WiMAX (Worldwide Interoperability for Microwave Access) is a technology for wireless broadband and the core technique for the fourth-generation (4G) wireless mobile communications. However it still facing real challenge for low complexity and efficient system implementation. It supports non-line-of-sight environment with high data rate transmission and high mobility up to 125 Km/hr. WiMAX adopt...

IEEE 802.16e (mobile WiMAX) uplink behavior is a relatively neglected area of investigation, but emerging interactive media services have highlighted the need for closer investigation of uplink issues. In this simulation study of uplink queue management, the authors found that media streaming by TCP-Friendly Rate Control (TFRC) has advantages. However, temporal behavior of the queuing disciplin...

In a cellular network, as the mobile devices move from cell to cell during an ongoing continuous communication, handover is performed for switching from one cell frequency to a different cell frequency, without interruption to the ongoing session. Mobile WiMAX handover mechanisms suffer from certain drawbacks, particularly related to wastage of channel resources, handover latencies and loss of ...

Scientists have explored that WiMAX has the potential to enhance the performance of the radar networks. With the idea of implementing MIMO (multi-input multi-output) communication technology for overcoming the challenges offered by hostile channel and environmental effects.It leads the technocrats to utilize this technology in radar operations. WiMAX MIMO can exploit the range of WiMAX and the ...

IEEE 802.16/WiMAX is the network which is designed with quality of service in mind. In this paper the authors have made an attempt to qualitatively analyse the performance factors at the physical layer of mobile WiMAX for Rayleigh and Rician channels using different modulation techniques. The comparison of quality of service parameters like BER and power spectral density between different chann...

This paper presents the design of a reconfigurable power amplifier for Mobile WIMAX applications in the user terminal. The amplifier, which operates from 3.4GHz to 3.5GHz, is based on the Doherty technique. This power efficiency enhancement technique is suitable for modern wireless communications systems, as Mobile WIMAX, that present with high peak-to-average power ratio (PAPR) to target high ...

WiMAX networks provide broadband data access to mobile as well as stationary users. While the wireless link is based on the 802.16e-2005 specification developed by IEEE, a complete network architecture “behind the base station” with global roaming support has been specified by the WiMAX forum. The security architecture for these networks covers EAP/AAA-based secure network access, secure bootst...

The WiMAX forum is based on 802.16d/e Orthogonal Frequency Division Multiplexing (OFDM) based adaptive Physical Layer (PHY) layer. In this paper, the performance of WiMAX PHY layer is investigated for two PHY layer modifications, link adaption algorithm (Adaptive Modulation and coding, AMC) and MCCDMA (hybrid OFDM system with multiple access technology, Code Division Multiple Access) to provide...

In this paper, adaptive modulation and coding (AMC) and repetition coding are considered as means to improve the link performance of Mobile WiMAX systems. The system evaluation is done starting from the applications error requirements in the attempt to achieve an optimum utilization of the available resources based on the variable channel conditions, without degrading too much the overall perfo...