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Key Technologies of 3G Video Services Data Recovery

Author: KongFanZeng
Tutor: JiZhongMei
School: PLA Information Engineering University
Course: Military Communication
Keywords: Video calls The multiplexing protocol data unit Error detection Error concealment
CLC: TN929.5
Type: Master's thesis
Year: 2010
Downloads: 23
Quote: 0
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Abstract


With the development of wireless communication technology, video services gradually become the core business of the mobile communication system. Relative to traditional voice services, video services has a large amount of data, delay and error sensitive research institutions at home and abroad for how to improve the performance of the receiver of the video business carried out extensive research. In this paper, for the purpose of receiving performance upgrade wireless video services, the first in-depth analysis of the existing wireless video processing technology, on this basis, the repair of damage control signaling incomplete data frame extraction, error detection and video of the video image image error concealment wireless video key technologies launched an in-depth study, the main work includes: (1) study the H.245 control protocol and its signaling interaction process analysis of key parameters configuration mechanism is given based on first experience knowledge H.245 control signaling restoration algorithm. Based on the H.324 protocol defines the control channel protocol stack model, the algorithm is introduced into the analytical program of the H.245 control signaling. The test results show that the algorithm effectively improve the success rate of repair of the damage control signaling. (2) analysis of H.223 multiplexing protocol, focusing on the composite layer and the adaptation layer framing mechanism and frame structure. Door of an identifier for identifying the multiplexer protocol data unit (MUX-PDU, Multiplexing Protocol Data Unit) limit set, given a BP neural network-based adaptive gate limit selection algorithm, the algorithm can dynamically adjust MUX- PDU frame identifier of the decision threshold, the simulation results show that, in contrast to the static frame identifier decision threshold under the same environment, the adaptive decision threshold to improve the extraction performance of the MUX-PDU frame identifier. (3) The combination of multiplexed protocol data unit (MUX-PDU) the characteristics of the structure gives a checksum algorithm based on the a posteriori information, the algorithm for the extraction of the multiplex protocol data unit (MUX-PDU) MUX-PDU frame identifier can effectively identify false alarms and false negatives. The algorithm is based on BP neural network adaptive threshold selection algorithm combined, joint extraction algorithm based on BP neural network and a posteriori information MUX-PDU, simulation results show that the algorithm can effectively reduce the multiplexing protocol the frame loss rate of the data unit (MUX-PDU), to improve the extraction performance of a multiplex protocol data unit (MUX-PDU) frame. (4) error detection for the video image, fully taking into account a priori knowledge and the video time domain correlation in the error detection an important role, based on a priori constraints to empty the Joint Video error detection algorithm. This algorithm combines the video sequence multiparty characterized in that the amount of information in the error detection, compared to conventional video image error detection algorithm can effectively improve the performance of error detection. The simulation results show that the algorithm error positioning accuracy than traditional algorithm significantly improved. (5) error concealment problem for video images, in contrast to the typical spatial error concealment algorithm time domain error concealment algorithm based on a reconstruction based on the average motion vector boundary matching error concealment method. The test results show that the algorithm improves the recovery of the degree of smoothing of the boundary of the block and the domain blocks in the PLC, to further improve the effect of error concealment.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications
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