Iterative Decoding of Concatenated Codes: A Tutorial
نویسندگان
چکیده
منابع مشابه
Iterative Decoding of Concatenated Codes: A Tutorial
The turbo decoding algorithm of a decade ago constituted a milestone in error-correction coding for digital communications, and has inspired extensions to generalized receiver topologies, including turbo equalization, turbo synchronization, and turbo CDMA, among others. Despite an accrued understanding of iterative decoding over the years, the “turbo principle” remains elusive to master analyti...
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Mutual information transfer characteristics for soft in/soft out decoders are proposed as a tool to better understand the convergence behavior of iterative decoding schemes. The exchange of extrinsic information is visualized as a decoding trajectory in the Extrinsic Information Transfer Chart. This allows the prediction of turbo cliff position and bit error rate after an arbitrary number of it...
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A hybrid concatenated code with two interleavers is the parallel concatenation of an encoder, which accepts the permuted version of the information sequence as its input, with a serially concatenated code, which accepts the unpermuted information sequence. The serially concatenated code consists of an outer encoder, an interleaver, and an inner encoder. An upper bound to the average maximum-lik...
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where p is an empirically chosen constant (0 < 1-1 < 2). The modification in the MBTS algorithm is in the last step where the quantisation levels are calculated. In the BTS algorithm the quantisation levels are selected at cluster centres. In MBTS, they are displaced from the cluster centres to facilitate the representation of more colours within a cluster with closer quantisation colours (eqn....
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Whenever variable-length entropy codes are used in the presence of a noisy channel, any channel errors will propagate and cause significant harm. Despite using channel codes, some residual errors always remain, whose effect will get magnified by error propagation. Mitigating this undesirable effect is of great practical interest. One approach is to use the residual redundancy of variable-length...
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ژورنال
عنوان ژورنال: EURASIP Journal on Advances in Signal Processing
سال: 2005
ISSN: 1687-6180
DOI: 10.1155/asp.2005.762