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The paper presents an overview of the main methods used to improve theefficiency of DVB systems, based on multiplexing, through a study on the impactof the multiplexing methods used in DVB, having as a final goal a better usageof the data capacity and the possibility to insert new services into theoriginal DVB Transport Stream. This study revealed that not all DVB providersare using statistical multiplexing. Based on this study, we were able topropose a method to improve the original DVB stream, originated from DVB-S orDVB-T providers. This method is proposing the detection of null packets,removal and reinserting a new service, with a VBR content. The method developedin this research can be implemented even in optimized statistical multiplexingsystems, due to a residual use of null packets for data rate adjustment. Thereis no need to have access in the original stream multiplexer, since the methodallows the implementation on the fly, near to the end user. The proposed methodis proposed to be applied in DVB-S to DVB-C translation, using the computingpower of a PC or in a FPGA implementation.

A Study on the Optimal Implementation of Statistical Multiplexing in DVB Distribution Systems