Low-latency Ultra-Reliable 5G Communications: Finite-Blocklength Bounds and Coding Schemes

Conference: SCC 2017 - 11th International ITG Conference on Systems, Communications and Coding
02/06/2017 - 02/09/2017 at Hamburg, Germany

Proceedings: ITG-Fb. 268: SCC 2017

Pages: 6Language: englishTyp: PDF

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Oestman, Johan; Durisi, Giuseppe; Stroem, Erik G. (Chalmers University of Technology, Gothenburg, Sweden)
Li, Jingya; Sahlin, Henrik (Ericsson Research, Gothenburg, Sweden)
Liva, Gianluigi (Deutsches Zentrum für Luft- und Raumfahrt (DLR), Wessling, Germany)

Future autonomous systems require wireless connectivity able to support extremely stringent requirements on both latency and reliability. In this paper, we leverage recent developments in the field of finite-blocklength information theory to illustrate how to optimally design wireless systems in the presence of such stringent constraints. Focusing on a multi-antenna Rayleigh block-fading channel, we obtain bounds on the maximum number of bits that can be transmitted within given bandwidth, latency, and reliability constraints, using an orthogonal frequency-division multiplexing system similar to LTE. These bounds unveil the fundamental interplay between latency, bandwidth, rate, and reliability. Furthermore, they suggest how to optimally use the available spatial and frequency diversity. Finally, we use our bounds to benchmark the performance of an actual coding scheme involving the transmission of short packets.