Paper Info
Title
Pilot Overhead vs. Pilot Power: Short Packet Structure Optimization for URLLC over Continuous Fading
Abstract
In this paper, we investigate how to strike the balance between pilot overhead and pilot power for short packet ultra reliable and low latency communication (URLLC) systems under continuous fading, as the previous work has not considered the joint impact of pilot overhead and pilot power on the system throughput and has assumed block fading only. It is revealed that, at low to moderate signal to noise ratio (SNR) or in continuous fading, pilot power boosting can reduce pilot overhead and improve throughput significantly, and that at high SNR, pilot overhead plays a dominant role in enhancing the throughput while maintaining a low peak to average power ratio. For throughput formulation, a closed-form expression for the asymptotic block error probability under continuous fading is derived with respect to pilot power, pilot length and block length. And for throughput maximization, the near-optimal pilot power and the near-optimal block length are given in closed form by solving complicated transcendental equations. Based on the analysis, a low-complexity joint pilot power, pilot length and block length optimization (JPLLO) algorithm is proposed, which achieves a near-optimal performance and a dramatic complexity reduction compared to exhaustive search, converging within only 1-3 iterations. The JPLLO algorithm also significantly outperforms the previous joint optimization algorithm under continuous fading.
Year
DOI
Venue
2021
10.1109/GLOBECOM46510.2021.9685410
2021 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM)
Keywords
DocType
ISSN
ultra reliable and low latency communication, short packet communication, joint optimization, continuous fading, pilot power boosting
Conference
2334-0983
Citations 
PageRank 
References 
0
0.34
0
Authors
4
Name
Order
Citations
PageRank
Xiayue Lin100.34
Xu Zhu237147.63
Yufei Jiang33222.37
Jie Cao412.73