具有UEP特性的LT编码方案

摘要

图像和视频文件在传输中对数据可靠性要求较高.为此,提出一种具有不等差错保护(UEP)特性的LT编码方案.研究无线信道中具有不等差错保护特性的LT码,通过增加适量重要信息比特,提高其在编码过程中被选中的概率,以实现对其保护.实验结果表明,在加性白高斯噪声和快瑞利衰落信道中,该编码方案能呈现较好的UEP特性.%In order to solve the problem that image and video have high data reliability requirement in transmission, this paper proposes Luby Transform(LT) coding scheme having Unequal Error Protection(UEP) characteristic. It analyses the UEP of LT coding in wirless channel, adds appropriate bit of important information to improve the rate of checking in coding process, and realizes the purpose of protection. Experimental results show that the performance of this scheme with iterative decoding is evaluated over Additive White Gaussian Noise(AWGN) and fast Rayleigh fading channels is good in the side of UEP characteristic.