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文中首先对与信源信道联合编码技术相关的一些必要背景知识作了简要介绍。接着提出了一种无线信道中基于小波SPIHT算法的联合信源信道编码方法。主要思想是信源部分采用基于小波SPIHT的编码方法,而信道部分采用RCPC编码对SPIHT输出码流按重要性进行不等错误保护,并加入交织以增强对突发错误的抗击能力。实验表明本方法能够提高系统的性能和编码效率,可以应用于信噪比波动较大的信道。
In this paper, some necessary background knowledge related to joint coding of source channel is introduced briefly. Then a joint source channel coding method based on wavelet SPIHT algorithm in wireless channel is proposed. The main idea is that the source part adopts the wavelet SPIHT-based coding method, and the part of the channel adopts the RCPC code to carry out the unequal error protection according to the importance of the SPIHT output code stream, and adds the interleaving to enhance the resistance against burst errors. Experiments show that this method can improve the system performance and coding efficiency, and can be applied to the channel with large signal to noise ratio fluctuation.