| Summary: | 碩士 === 大同大學 === 電機工程學系(所) === 98 === In recent years, multimedia over wireless network develop rapid, especially in real-time video transmission application that need certain requirements for the wireless network QoS. Therefore, how to effectively use resources to provide quality of service and improve network performance is very important. The IEEE formed a group called 802.16 to develop a standard for what was called a wireless metropolitan area network; WIMAX, which has long transmission distance, high transfer rate, QoS guarantees. And through network scheduling and queue bandwidth allocation to provides a variety of internet real-time applications more efficient.
This thesis focuses in WIMAX environment analysis performance of real-time video application. About video transmission, we use the MPEG-4 compression format, which with high compression ratio and excellent image quality suitable for wireless data transmission. The network simulation software we chose the current popular Network Simulation 2 (NS2) to build our WIMAX network environment. Through different scheduling mechanism and Cyclic Prefix (CP) to simulate variation of performance for real-time video transmission with number of nodes increases such as network capacity, average delay, throughput, packet loss, average jitter, and PSNR. Finally we compare performance of different type service for combine video traffic and VoIP traffic with single node to simulate video telephone application.
The result we get Active Queue Management RED has highest network capacity than other compare Queue Management under latency guideline 150ms and which network capacity of CP1/32 for 15nodes, which is 1.5times than CP1/4, and the rtPS service more suitable than UGS service for video telephone application that combines video traffic and VoIP traffic.
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