A Study on Power and Bit Assignment of Embedded Multi-Carrier Modulation Schemes for Hierarchical Image Transmission over Digital Subscriber Line

In this letter, we study the problem of designing an efficient power and bit allocation scheme in the context of a hierarchical image transmission system based on an embedded multi-carrier modulation (EMCM) scheme over digital subscriber line. Authors describe a novel algorithm that performs power minimization under bit rate constraint and QoS requirement. It is based on the Hughes-Hartogs algorithm, and successively allocates the bits of the high, then low priority data streams. Simulations that assess the performance of the proposed algorithm are also provided and discussed; they demonstrate the interest of the proposed scheme. key words: hierarchical modulation, digital subscriber line, embedded multi-carrier modulation, image transmission