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In this paper, the authors propose a scheme to construct Low-Density Parity-Check (LDPC) codes that are suitable for Unequal Error Protection (UEP). They derive Density Evolution (DE) formulas for the proposed unequal error protecting LDPC ensembles over the Binary Erasure Channel (BEC). Using the DE formulas, they optimize the codes. For the finite-length cases, they compare their codes with some other LDPC codes, the time-sharing method, and a previous work on UEP using LDPC codes. Simulation results indicate the superiority of the proposed design methodology for UEP.
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