A Low-Complexity LDPC Decoding Algorithm for Hierarchical Broadcasting: Design and Implementation

In this paper, we present a structure-based decoding algorithm for the hierarchical broadcasting systems. Unlike the traditional hierarchical demodulation approaches that suffer from serious interlayer interference (ILI), the proposed method exploits the structure information on the secondary layer to mitigate the ILI impairment, thereby offering significant gains in reception performance. The algorithm can be applied to different channel coding and mapping schemes under various channel profiles. In addition, the new algorithm has been implemented on a broad-band in-band-on-channel digital radio broadcasting system. Numerical results from both simulations and laboratory experiments are provided to quantify the performance advantages of the new algorithm.