Finite Blocklength Regime Performance of Downlink Large Scale Networks

Type
Article

Authors
Hesham, Nourhan
Chaaban, Anas
Elsawy, Hesham
Hossain, Jahangir

KAUST Grant Number
OSR-2018-CRG7-3734

Date
2023-05-26

Abstract
Some emerging 5G and beyond use-cases impose stringent latency constraints, which necessitates a paradigm shift towards finite blocklength performance analysis. In contrast to Shannon capacity-achieving codes, the codeword length in the finite blocklength regime (FBR) is a critical design parameter that imposes an intricate tradeoff between delay, reliability, and information coding rate. In this context, this paper presents a novel mathematical analysis to characterize the performance of large-scale downlink networks using short codewords. Theoretical achievable rates, outage probability, and reliability expressions are derived using the finite blocklength coding theory in conjunction with stochastic geometry, and compared to the performance in the asymptotic regime (AR). Achievable rates under practical modulation schemes as well as multilevel polar coded modulation (MLPCM) are investigated. Numerical results provide theoretical performance benchmarks, highlight the potential of MLPCM in achieving close to optimal performance with short codewords, and confirm the discrepancy between the performance in the FBR and that predicted by analysis in the AR. Finally, the meta distribution of the coding rate is derived, providing the percentiles of users that achieve a predefined target rate in a network.

Citation
Hesham, N., Chaaban, A., ElSawy, H., & Hossain, J. (2023). Finite Blocklength Regime Performance of Downlink Large Scale Networks. IEEE Transactions on Wireless Communications, 1–1. https://doi.org/10.1109/twc.2023.3278573

Acknowledgements
This publication is based upon work supported by King Abdullah University of Science and Technology (KAUST) under Award No. OSR-2018-CRG7-3734.

Publisher
Institute of Electrical and Electronics Engineers (IEEE)

Journal
IEEE Transactions on Wireless Communications

DOI
10.1109/twc.2023.3278573

arXiv
2305.12760

Additional Links
https://ieeexplore.ieee.org/document/10137396/

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