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Design of Point-to-multipoint Wireless Real-time Transmission System

Author: WangYingLi
Tutor: ZhuangZuoZuo
School: Xi'an University of Electronic Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Point-to-multipoint Bluetooth MPEG-4 Real-time video
CLC: TN919.8
Type: Master's thesis
Year: 2008
Downloads: 45
Quote: 2
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Abstract


The rapid development of wireless communication and video technology , wireless video communications become a hot research . Wireless channel susceptible to interference and can not provide reliable video transmission quality . Prediction and entropy coding techniques as conventional video coding system , will inevitably lead to dissemination and diffusion of channel errors along the time domain and airspace in the video sequence , the compressed video stream is more susceptible to the influence of the error , exacerbated the deterioration of image quality of the reception side . Therefore , the error resilience performance of video communication under wireless error environment is very challenging issue . How limited bandwidth resources efficiently control channel interference video stream , to get the best video quality at the decoder side , must face the problem of wireless video communications point on whether the application of the wireless communication the multi-point technology to build a point-to-multipoint wireless real-time video communication systems . These are concerned about in this article . The main content of this paper are: (1) simply introduces the MPEG-4 video compression technology, including the main features of the MPEG-4 error control technology, data structures and stream structure . ( 2) a simple introduction to Bluetooth technology , focuses on point-to-point and point-to-multipoint communication mechanism in Bluetooth . In a Bluetooth piconet , the master device and up to seven Bluetooth slave device for communication can be synchronized from the device and up to 255 but does not communicate . Using time division multiplexing communication mechanism , the master device launched in the even-numbered slots transmission, transmission is initiated from the device under the control of the main equipment in the odd-numbered slots . (3) to focus on the detailed design process multipoint Bluetooth wireless real - time video transmission system , including software design , architecture , graphical interface design and analysis of the experimental results . In this paper, Bluetooth and MPEG-4 technology to achieve a point-to-multipoint wireless real - time video transmission system . The system can simultaneously display up to four Bluetooth collected from the device to the real-time video . The resolution of the image displayed 352pixel × 288pixel, when four capture video from the device at the same time when the average framerate of 20fps, the maximum total transmission rate of 1.5Mbps ( test only the transmission rate) , the delay is approximately 110ms .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Image communication, multimedia communication
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