Huang YHuang PBORCHING SU2021-09-022021-09-022020https://www.scopus.com/inward/record.uri?eid=2-s2.0-85100391499&doi=10.1109%2fGLOBECOM42002.2020.9322533&partnerID=40&md5=76b5457aaa4162c11a744b82ff604f71https://scholars.lib.ntu.edu.tw/handle/123456789/580552A preamble optimization design based on circularly pulse-shaped orthogonal frequency division multiplexing (CPSOFDM) modulation for subband-wise short packet transmissions in 5GmMTC and URLLC is proposed. To meet the four preamble signal requirements of periodically low autocorrelation (AC), low out-of-subband emission (OSBE), low peak-to-average power ratio (PAPR), and fixed energy simultaneously, a quartic minimization problem is formulated by taking the complex-valued pilot symbols fed into the CPS-OFDM transceiver as variables. This problem is then solved under the majorization-minimization (MM) convex-iteration (CI) algorithmic framework with semidefinite relaxation. As revealed in simulation results, the proposed CPS-OFDM preamble, resulting from the optimal pilot sequence solution, can achieve lower AC, OSBE, and PAPR, compared to the preambles produced by the existing Zadoff-Chu (ZC), pseudo-random (PN), and low-PAPR type 1 (LP1) sequences defined in the 3GPP specifications for 5G New Radio (NR). In addition, although there exists carrier frequency offset (CFO) and inter-block interference (IBI) in the CPS-OFDM system without guard interval, the proposed preamble also leads to better packet data detection reliability than the others, because of its excellent timing offset (TO) estimation performance. ? 2020 IEEE.5G mobile communication systems; Frequency allocation; Frequency estimation; Iterative methods; Optimization; Packet networks; Radio transceivers; Algorithmic framework; Carrier frequency offsets; Estimation performance; Interblock interference; Minimization problems; Optimal pilot sequences; Peak to average power ratio; Semidefinite relaxation; Orthogonal frequency division multiplexingconference paper10.1109/GLOBECOM42002.2020.93225332-s2.0-85100391499