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根据压缩码流特性和传输信道特性,综合利用CRC冗余校验和基于码率兼容的删除Turbo码,通过在信源编码和信道编码之间引入判决控制器,提出了一种适用于图像实时无线传输的非均匀纠错编码方案,并在衰落信道中对该方案的性能进行了仿真实验。结果表明:该方案在一定的信噪比范围内明显优于传统的均匀纠错编码传输系统,尤其在低信噪比和图像高压缩比情况下,优势更为明显;另外,随着信道条件的逐渐恶化,该方案优于均匀纠错方案的信噪比范围逐渐变宽。
According to the character of compressed stream and the characteristics of transmission channel, CRC redundancy checking and turbo coding based on code rate are used synthetically. By introducing decision controller between source coding and channel coding, Wireless transmission of the non-uniform error correction coding scheme, and in the fading channel of the performance of the program simulation. The results show that the proposed scheme is obviously superior to the traditional uniform error correction coding transmission system in a certain range of signal-to-noise ratio, especially in low signal-to-noise ratio and high image compression ratio. In addition, The signal to noise ratio range of this scheme is better than the uniform error correction scheme.