Joint Block Length and Pilot Length Optimization for URLLC in the Finite Block Length Regime

Cao, Jie, Zhu, Xu ORCID: 0000-0002-7371-4595, Jiang, Yufei, Liu, Yujie and Zheng, Fu-Chun
(2019) Joint Block Length and Pilot Length Optimization for URLLC in the Finite Block Length Regime. In: GLOBECOM 2019 - 2019 IEEE Global Communications Conference, 2019-12-9 - 2019-12-13.

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In this paper, we maximize the system throughput of a point-to-point ultra-reliable low-latency communications (URLLC) system by jointly optimizing its block length and pilot length under the constraints of latency and block error probability. A finite block length (FBL) is adopted to enable low transmission latency. We prove that the throughput is approximately concave with respect to pilot length, given a block length, and that there exists a unique optimal block length in terms of throughput, with a given pilot length. Closed-form expressions are derived for the near-optimal pilot length with a given block length, as well as the asymptotic block error probability with respect to both block length and pilot length. A low-complexity iterative algorithm is proposed for joint optimization of block length and pilot length, which converges within only 1-3 iterations. Simulation results show that the proposed joint optimization scheme achieves a near-optimal throughput performance of an FBL URLLC system, with a much lower complexity than exhaustive search. It also significantly outperforms the previous approaches that considered either block length optimization or pilot length optimization only.

Item Type: Conference or Workshop Item (Unspecified)
Uncontrolled Keywords: Ultra-reliable low-latency communications, finite block length, pilot length, joint optimization
Depositing User: Symplectic Admin
Date Deposited: 27 Aug 2019 14:20
Last Modified: 22 Feb 2024 23:50
DOI: 10.1109/globecom38437.2019.9013958
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