Enhancement of WiMAX networks using OPNET modeler platform

Abstract

Worldwide interoperability microwave access (WiMAX) is an 802.16 wireless standard that delivers high speed, provides a data rate of 100 Mbps and a coverage area of 50 km. Voice over internet protocol (VoIP) is flexible and offers low-cost telephony for clients over IP. However, there are still many challenges that must be addressed to provide a stable and good quality voice connection over the internet. The performance of various parameters such as multipath channel model and bandwidth over the Star trajectoryWiMAX network were evaluated under a scenario consisting of four cells. Each cell contains one mobile and one base station. Network performance metrics such as throughput and MOS were used to evaluate the best performance of VoIP codecs. Performance was analyzed via OPNET program14.5. The result use of multipath channel model (disable) was better than using the model (ITU pedestrian A). The value of the throughput at 15 dB was approximately 1600 packet/sec, and at -1 dB was its value 1300 packet/se. According to data, the Multipath channel model of the disable type the value of the MOS was better than the ITU Pedestrian A type.

An innovative approach for enhancing capacity utilization in point-to-point voice over internet protocol calls

“…However, VoIP packet merging methods cause numerous dilemmas. In general, i) VoIP call quality is deteriorating, ii) packet merging methods need a good number (a high number) of simultaneous VoIP sessions to work, and iii) the merging process might make network devices work harder because of the processing that comes from merging [1], [13], [14].…”

“…However, the packet header compacting methods cause numerous dilemmas. Generally, i) the compacting methods encompass a variety of operations and processes that affect and decrease the efficiency of the network devices, and ii) the compacting methods are undesirable in situations where multiple packets are lost, as the header values of the subsequent packets will be incorrect [1], [14], [18].…”

“…Due to several factors, voice over internet protocol (VoIP) data is increasingly transported over computer-based networking, both wired and wireless networks. These factors include the advanced voice signal processing methods, the proliferation of mobile devices, the noticeable low call rate, and the wide spread of the Internet service [1]. Although there is no guarantee of call quality, numerous degradations in the wired and wireless network infrastructure can affect the voice signal.…”

Simulation of Multimedia Data Transmission Over WSN Based on MATLAB/SIMULINK

“…The OPNET simulator offers an object-oriented programming approach and hierarchical modeling. Additionally, it provides the facility of customized functions where it can be developed from scratch [15], [16], [17], [18]. For example, the researchers in [19] used OPNET and ZigBee to implement WSN to perform water quality monitoring.…”