An UEP transmission scheme based on distributed EEP rateless codes

In this paper a new coding scheme is proposed to accomplish unequal error protection (UEP) for distributed rateless codes. This coding scheme can be applied when multi-sources symbols share a single relay and the relay has no knowledge about their importance levels. We design this coding scheme by encoding the symbols with a second LT process at the relay. UEP property is provided via several equal error protection (EEP) LT processes. Asymptotical analyses have been made on how the encoding parameters affect the error performances. Experimental results show that the second LT process at the relay significantly improves the error performances of the symbols. Asymptotic analysis and experimental results prove this coding scheme viable.