PREAMBLE DETECTION IN WIMAX 802.16E ON OFDM WITH AWGN CHANNEL

Abstract

WiMAX acronym meaning “Worldwide Interoperability for Microwave Access”. It is an IP based Wireless Broadband Access Technology utilizing IEEE 802.16e-2005 standard as the air interface. Range of WiMAX is 15 Kms for Rural area (LOS) and 4 Kms for Urban area. User can expect to have broadband access speeds ranging from 256 Kbps to 2 Mbps. WiMAX will provide broadband connectivity anywhere, anytime, for any device and on any network. Examples include: High speed internet access where it is currently unavailable. Substantially increase data speeds for applications like Online Gaming, Video Conferencing and Streaming Video. The WiMAX technology incorporates much better and more flexible security support than the Wi-Fi standard. All user traffic is encrypted before being routed through the Network. In this paper implement different convolution methods for detection of preamble. These methods comparative analysis is done by apply different lag factor and integration length. These methods are SC (Schmidl and Cox maximum normalized correlation), maximum normalized correlation using a GM (geometric mean), MMSE (minimum mean squared error), ML (maximum likelihood). ML (Maximum Likelihood) method is better than the other is shown by the results. In correlation methods varying the value of correlation lag and find out what is the effect on detection technique. In this preamble detection method we used different communication channel like AWGN and Reyligh fading channel, also used digital modulation techniques QAM (Quadrature amplitude modulation) with OFDM (Orthogonal frequency division modulation). The performance has been concluded based Sample versus Detection value and output through MATLAB-R3013a Simulation tool.