earticle

영어

Broadband access technology has significant influences in the telecommunication industry. Worldwide interoperability for microwave access (WiMAX) is a broadband wireless technology which brings broadband experience to a wireless context. IEEE 802.16 Wireless MAN standard specifies a Medium Access Control (MAC) layer and a set of physical layers to provide fixed and mobile Broadband Wireless Access (BWA) in broad range of frequencies. The WiMAX forum has adopted IEEE 802.16 OFDM physical layer for the equipment manufacturer due to its robust performance in multipath environment. The aim of this paper is the performance evaluation of bit error rate in Wimax system under different combinations of digital modulation (BPSK, QPSK, 4-QAM and 16-QAM) and the Stanford University Interim (SUI) Channel model is selected for the wireless channel in the simulation. And the Wimax system incorporates Reed-Solomon (RS) encoder and Convolutional encoder with 1/2, 2/3 and 3/4 rated codes in FEC channel coding. It can be seen from the simulation results that the lower modulation and coding scheme provides better performance with less SNR in the Wimax communication system. The evaluation was done in simulation developed in MATLAB.