Abstract:

To match the multimedia service transmission, an unequal error protection (UEP) scheme based on the independent window LT (IW-LT) code is proposed. According to the level of importance, the original data are divided into independent windows and encoded by rateless LT codes. The asymptotic decoding performance of IW-LT codes is derived by the AND-OR tree analysis technique. Moreover, to accurately match the expected UEP gain and decoding overhead, multi-objective genetic algorithms are introduced to optimize the degree distribution and probabilities of selecting windows, which enhance the flexibility of the IW-LT UEP scheme. The simulation results show that, compared with the existing rateless coding UEP scheme, IW-LT codes can obtain a lower decoding error rate under the fixed parameters of UEP property.