Coarsely quantized decoding and construction of polar codes using the information bottleneck method

The information bottleneck method is a generic clustering framework from the field of machine learning which allows compressing an observed quantity while retaining as much of the mutual information it shares with the quantity of primary relevance as possible. The framework was recently used to design message-passing decoders for low-density parity-check codes in which all the arithmetic operations on log-likelihood ratios are replaced by table lookups of unsigned integers. This paper presents, in detail, the application of the information bottleneck method to polar codes, where the framework is used to compress the virtual bit channels defined in the code structure and show that the benefits are twofold. On the one hand, the compression restricts the output alphabet of the bit channels to a manageable size. This facilitates computing the capacities of the bit channels in order to identify the ones with larger capacities. On the other hand, the intermediate steps of the compression process can be used to replace the log-likelihood ratio computations in the decoder with table lookups of unsigned integers. Hence, a single procedure produces a polar encoder as well as its tailored, quantized decoder. Moreover, we also use a technique called message alignment to reduce the space complexity of the quantized decoder obtained using the information bottleneck framework.

Subjects

information bottleneck method

polar codes

quantized decoding

code construction

MLE@TUHH

DDC Class

380: Handel, Kommunikation, Verkehr

600: Technik

620: Ingenieurwissenschaften

Funding(s)

Open Access Publizieren 2018 - 2019 / TU Hamburg

More Funding Information

Deutsche Forschungsgemeinschaft (DFG)

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

algorithms-12-00192-v2.pdf

Size

1.17 MB

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Adobe PDF

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Coarsely quantized decoding and construction of polar codes using the information bottleneck method