Joint source-channel coding with variable length codes
Joint source-channel coding with variable length codes
复制标题
使用可变长度代码的联合源信道编码
DOI：
10.1109/isit.1997.613356
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
V. Balakirsky
中科院分区：
文献类型：
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作者：
V. Balakirsky
我们考虑一种信息传输方案，其中使用可变长度的代码对消息流进行编码，并且通过有噪声的离散无记忆信道传输作为码字的级联获得的代码序列。解码器构建消息的估计流。注意，如果变长编码仅用于信源编码，则涉及使用可变长度编码在噪声信道上传输的问题也会出现，因为任何信道编码方案都不能将噪声水平降低到零。我们提出了一种卷积型译码算法，假设：(1)译码码序列的总长度是已知的，(2)译码延迟是允许的，并且译码码构造了整个消息流的最大似然估计。
We consider an information transmission scheme where a stream of messages is encoded using a variable length code, and the code sequence, obtained as a concatenation of codewords, is transmitted over a noisy discrete memoryless channel. The decoder constructs a stream of estimates of the messages. Note that the problems that concern the use of variable length codes for transmission over noisy channels also appear if the code is used only for source encoding since any channel coding scheme cannot reduce the level of noise up to zero. We propose a convolutional-type decoding algorithm assuming that: (1) the total length of the transmitted code sequence is known to the decoder and (2) decoding delay is allowed and the decoder constructs a maximum likelihood estimate of the whole stream of messages.