An improved expanding window fountain codes for unequal error protection

An improved expanding window fountain code for unequal error protection is proposed in this paper. For expanding window fountain (EWF) codes, the increased performance of more important bits (MIB) is achieved at the cost of decreased performance of less important bits (LIB). On the basis of EWF codes, the proposed method uses the expanding window to cover all the input information symbols and alter the selection of symbols incorporated in the output symbols. Simulation results show that the improved EWF codes reduce the difference between MIB and LIB set in bit error rate (BER). And the performance of the proposed fountain codes excels EWF codes.