In-Band Pilot Overhead in Ultra-Reliable Low Latency Decode and Forward Relaying

In URLLC the performance of short message communications highly depends on the training sequence length due to the stringent latency and reliability requirements. In this paper, we study the performance of cooperative and non-cooperative transmissions under imperfect channel estimation and Rayleigh fading for URLLC. We assume a peak power constraint on pilot symbols in addition to the average power constraint which is used for comparison purposes. We obtain the optimal training length as a function of blocklength and power constraint factor to meet the URLLC requirements. Moreover, the simulation results show the impact of pilot overhead on reliability, latency, and goodput of cooperative communications compared to point-to-point transmission.

Authors:
Nouri Parisa, Alves Hirley, Demo Souza Richard, Latva-aho Matti

Publication type:
A4 Article in conference proceedings

Place of publication:
2019 IEEE 89th Vehicular Technology Conference (VTC Spring). 28 April – 1 May 2019, Kuala Lumpur, Malaysia

Keywords:
finite blocklength, latency, Pilot estimation, Power constraint, Relaying, URLLC

Published:
27 June 2019

Full citation:
P. Nouri, H. Alves, R. D. Souza and M. Latva-aho, “In-Band Pilot Overhead in Ultra-Reliable Low Latency Decode and Forward Relaying,” 2019 IEEE 89th Vehicular Technology Conference (VTC2019-Spring), Kuala Lumpur, Malaysia, 2019, pp. 1-5. doi: 10.1109/VTCSpring.2019.8746566

DOI:
https://doi.org/10.1109/VTCSpring.2019.8746566

Read the publication here:
http://urn.fi/urn:nbn:fi-fe202001071361