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Multidimentional Modulation for Multimedia Communications

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Stepping up the capacity of wireless communication

End-to-end design of wireless multimedia systems poses a number of challenges that calls for heightened research and transfer of both expertise and knowledge. One EU-funded initiative has made headway in this area by establishing an international research group focused on providing relevant solutions.

Digital Economy

The ‘Multidimentional modulation for multimedia communications’ (M3COM) project investigated the particular difficulties of designing modulation that can offer robust and flexible connections for multimedia/video wireless communications. General scientific objectives included improving the performance of transceivers that exploit multi-dimensional (MD) communication channels and providing tools to match protection capability with the requirements of video encoders for unequal error protection (UEP). Specifically, project members aimed to design and analyse MD-coded modulation schemes suited to channels offering multiple transmission dimensions – so-called hybrid automatic request (HARQ) and relay communications. In addition, they sought to design and analyse coded hierarchical modulation (HM) schemes for UEP in one-dimensional (1-D) and MD transmissions. Activities centred on HARQ transmission and focused on its analysis and optimisation with variable rate operation in rapidly varying channels. Advances in this area pave the way for future, especially in relation to relay-based communications. Work on HM transmission dealt with code-modulation for non-uniform (such as HM) constellations and an information-theoretic analysis of HM. The latter involved efforts to extend the conventional theory of superposition coding, which the basic idea of HM adopts, to discrete signal sets. Other project efforts and outcomes included the establishment of solid collaborative links between two major institutions, INRS in Canada and LSS (CNRS) in France. Establishing an international research group involving other partners had the goal of increasing the international visibility of the M3COM’s collaborating institutions. The project took a three-step approach to realising this which included applying for funding to increase the intensity of collaborative research as well as involve more students in the group.

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