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为了在保持高优先级数据包优异性能的同时花费较小的代价来恢复低优先级数据包,提出了一种基于单反馈的UEP-LT编码方案。当高优先级数据包完全恢复后引入反馈,编码器根据反馈信息同时调整参与编码的源数据包和编码方案。通过仿真给出了参与编码的源数据包的最佳选取方式,并对此方案的性能进行了仿真分析。结果表明,该方案明显提高了低优先级数据包的译码性能。
In order to recover low-priority data packets at a lower cost while maintaining the superior performance of high-priority data packets, a single feedback UEP-LT coding scheme is proposed. When high-priority data packets are completely restored, feedback is introduced. The encoder adjusts the source data packets and the coding schemes participating in the coding simultaneously according to the feedback information. The best way to select the source data packets involved in encoding is given through simulation. The performance of this scheme is simulated and analyzed. The results show that this scheme obviously improves the decoding performance of low-priority data packets.