Low-Complexity Joint Channel Estimation and List Decoding of Short Codes

Konferenz: SCC 2019 - 12th International ITG Conference on Systems, Communications and Coding
11.02.2019 - 14.02.2019 in Rostock, Germany


Tagungsband: SCC 2019

Seiten: 5Sprache: EnglischTyp: PDF

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Coskun, Mustafa Cemil (Institute of Communications and Navigation, German Aerospace Center, Weßling, Germany & Institute for Communications Engineering, Technical University of Munich, Munich, Germany)
Liva, Gianluigi (Institute of Communications and Navigation, German Aerospace Center, Weßling, Germany)
Oestman, Johan; Durisi, Giuseppe (Department of Electrical Engineering, Chalmers University of Technology, Gothenburg, Sweden)

A pilot-assisted transmission (PAT) scheme is proposed for short blocklengths, where the pilots are used only to derive an initial channel estimate for the list construction step. The final decision of the message is obtained by applying a non-coherent decoding metric to the codewords composing the list. This allows one to use very few pilots, thus reducing the channel estimation overhead. The method is applied to an ordered statistics decoder for communication over a Rayleigh block-fading channel. Gains of up to 1.2 dB as compared to traditional PAT schemes are demonstrated for short codes with QPSK signaling. The approach can be generalized to other list decoders, e.g., to list decoding of polar codes.