Enhanced Network Throughput of Wireless Network for Digital Video Transmission

摘要

Digital video transmission using wireless technology is an important functionality in multimedia communication. Such wireless transmission considers various parameters of channel like reliability, quality of service (QoS), transmission rate, transmission delay etc. User datagram protocol (UDP) is a fast transmission protocol used by most of the real-time applications as it is suitable for delay sensitive applications like video and audio transmission. UDP does not provide flow control or error recovery and does not require connection management. Since more applications with real-time constraints are introduced day by day, both over wired and over wireless, some improvements should be made in order to obtain better end to end performance. This paper surveys the literature on real time communication over wireless and suggests an intermediate solution providing more reliability in transmission using adaptive error control mechanism. The idea used is to inject an adaptive amount of redundant packets (RPs) in every sent block (or datagram) in order to achieve a desired recovery rate at the receiver without using any retransmission mechanism. The technique used is called adaptive forward error control (AFEC) and is implemented at physical layer. The network simulator NS-2 is used to evaluate AFEC and the simulation results indicate that the suggested methods can guarantee enhanced network throughput for video transmission in the high packet loss wireless network.