CAJ | 학술논문

该文提出一种在无线信道上进行图像传输的方案。喷泉码具有码率无关性，无需反馈信道，降低了系统复杂度。然而，传统喷泉码存在译码效率低、信息恢复质量对噪声敏感的问题。该方案基于系统Raptor码，在信道条件理想的情况下无需译码，提高了译码效率；引入不等差错保护(UEP)特性，根据信息重要性进行码率优化，使系统在不同信道环境中具有更好的稳定性。实验结果表明，在二进制删除信道信道(BEC)下，与传统纠错码和 LT码及采用等差错保护(EEP)的Raptor码相比，该方案可显著提高传输的可靠性，获得更好的图像恢复效果。
해문제출일충재무선신도상진행도상전수적방안。분천마구유마솔무관성，무수반궤신도，강저료계통복잡도。연이，전통분천마존재역마효솔저、신식회복질량대조성민감적문제。해방안기우계통Raptor마，재신도조건이상적정황하무수역마，제고료역마효솔；인입불등차착보호(UEP)특성，근거신식중요성진행마솔우화，사계통재불동신도배경중구유경호적은정성。실험결과표명，재이진제산제신도신도(BEC)하，여전통규착마화 LT마급채용등차착보호(EEP)적Raptor마상비，해방안가현저제고전수적가고성，획득경호적도상회복효과。
A scheme for image transmission over wireless channel is proposed. Being rateless, fountain codes could reduce system complexity and no feedback channel is needed. Traditional fountain code has a low decoding efficiency, and the quality of the recovered information is sensitive to noise. Based on systematic Raptor, this method can improve the decoding efficiency because decoding is not even needed in the ideal channel. With the introduction of Unequal Error Protection (UEP) characteristics, this scheme makes the bitrate optimized according to the importance of information, so that a better stability can be achieved at different channel conditions. The experiment results show that, compared with traditional error-correcting codes and Raptor with Equal Error Protection (EEP), this scheme can greatly improve the transmission reliability and achieve better reconstructed image quality over Binary Erasure Channel (BEC).