A novel UEP resource allocation scheme for layered source transmission in COFDM systems

This paper proposes a novel unequal error protection (UEP) resource allocation scheme for layered source transmission in coded OFDM systems. In the proposed scheme, firstly the resource allocation problem for two layered source is solved by UEP Fischer bit loading algorithm and golden search method. Secondly, according to the divide and conquer principle, the optimization of resource allocation for the multi-layered source can be decomposed hierarchically into sub-problems. And luckily, each sub-problem can be well solved by the above algorithm developed for the two layered source. Finally we design an efficient routine in which optimized resource allocation results for multi-layered source can be updated recursively through calculation and merging of solutions to the decomposed subproblems. Experimental results show that compared with traditional resource allocation schemes, the proposed scheme can effectively decrease the reconstructed distortion with moderate time complexity in a variety of channel conditions.