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A content adaptive, network aware approach for joint optimization of wireless video transmission is presented in this article. The joint system optimization approach has been developed in the framework of the IST PHOENIX project (www.ist-phoenix.org).After a description of the considered crosslayer approach and of the information to be exchanged among the system component blocks, the concept of "JSCC/D controllers" is introduced. Results obtained through the demonstrator realized as proof-of-concept for the described paradigm are then shown, confirming the validity of the described joint optimization approach.

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In this paper, a one-pass multi-layer rate-distortion optimization algorithm is proposed for quality scalable video coding. To improve the overall coding efficiency, the MB mode in the base layer is selected not only based on its rate-distortion performance relative to this layer but also according to its impact on the enhancement layer. Moreover, the optimization module for residues is also improved to benefit inter-layer prediction. Simulations show that the proposed algorithm outperforms the most recent SVC reference software. For eight test sequences, a gain of 0.35 dB on average and 0.75 dB at maximum is achieved at a cost of less than 8% increase of the total coding time.

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