The Design And Implementation Of Interactive Multimedia System For Wireless Environment

With the rapid development of the network technologies multimedia applications based ontransmission have been motivated greatly. The fast developments of micro-electronic andphoto-electronic technologies, combining the network technology, gestate a new computing era.Mobile computing system based on personal digital assistant (PDA), laptop and wearabledevices has been used widely. It is not a dream for mobile users to operate computer whenmoving. They can connect to network to send and receive data anywhere at any time bydifferent ways. The cyberspace and physical space will be integrated into one whole space.In this context this paper intends to develop an interactive multimedia system based onwireless environment. The designed system mainly consists of a wireless interactive platformvia IEEE802.11b wireless network, which can allow the transmission of a large amount ofmultimedia data and interactive communication between mobile devices(PDA, Laptop), thecenter of data service, and mobile devices. In addition, we do some simulations to evaluate thedesigned system. According to the experiment results the system performances are analyzed.The designed system has the following characteristics. First, it is a mobile system supportinginteractive multimedia communication based on wireless environment, which can enable usersto enjoy mobile multimedia services anywhere at any time. Second, mobile users holdingwireless devices can send simple interactive requests to service system according to theirservice demands. This can gratify the interactive need of mobile users by providing thefunction of simple interactive commands.The first chapter analyses the status quo of multimedia transmission, its technologybackground, characteristics of streaming multimedia and the requirements of the possiblefuture development of the cable network. Furthermore, the feasibility and the technicalfoundation for the design of the interactive system based on wireless network are analyzed. Inthe second chapter the technological details of Audio and Video Codec are introduced.Comparing between several Audio and Video Coding Standards, we choose H.264 videocoding standard as a best choice for the interactive multimedia system working in wirelessenvironment. In the third chapter after analyzing the characteristics of wireless transmissionstandards, we present the transmission protocols RTP/RTCP and wireless standards 802.11b, which will be used in the proposed interactive multimedia system. Then we analyze thetransmission-related problems in wireless network, such as delay, self-adaptive bandwidth andsynchronization between audio and video. In the fourth chapter, we propose and design awireless interactive multimedia system, and its corresponding architecture, logical frame, andthe basic functions of each module are given in details. In the fifth chapter the functionmodules are implemented and some experiments are performed to test the efficiency of theproposed system. Finally the works are concluded and some future works are given.