Effect of Modulation Techniques on the Performance of Voice and Video Service for WiMAX Networks in Baghdad

With the growing and widespread variety of wireless networking technologies such as “Worldwide Interoperability for Microwave Access” (WiMAX) the number of users of internet devices continues to grow. For WiMAX, network stability is highly dependent on the “Quality of Service” (QoS) and connection with the internet requires adequate bandwidth, especially for voice and video services. The quality of service for voice and video services is a problem in internet communication as a whole. One way to maintain the stability of the service quality is to use a modulation technique, where the modulation technique enables adjustment of a signal modulation pattern which depends on the signal to noise ratio (SNR) condition. In this article, we study and compare the types of modulation QPSK, 16QAM, and 64QAM for WiMAX Network in Baghdad. The obtained test results are compared in terms of the delay, throughput, Block error rate (BLER) and signal to noise ratio (SNR) for different modulation techniques.