eprintid: 10191999 rev_number: 8 eprint_status: archive userid: 699 dir: disk0/10/19/19/99 datestamp: 2024-05-10 11:44:25 lastmod: 2024-05-10 11:44:25 status_changed: 2024-05-10 11:44:25 type: article metadata_visibility: show sword_depositor: 699 creators_name: Zhou, Xingguang creators_name: Zhu, Yongxu creators_name: Xia, Wenchao creators_name: Zhang, Jun creators_name: Wong, Kai-Kit title: Optimized Payload Length and Power Allocation for Generalized Superimposed Pilot in URLLC Transmissions ispublished: inpress divisions: UCL divisions: B04 divisions: C05 divisions: F46 keywords: URLLC, massive MIMO, superimposed pilot, finite blocklength note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. abstract: Ultra-reliable and low-latency communication (URLLC) is recognized as the most challenging use case for the next generation of wireless networks. Existing research on URLLC is based on the regular pilot (RP) scheme, which is tough to ensure a high transmission rate with stringent latency and reliability requirements due to the impact of finite blocklength, especially in massive connectivity scenarios. In this paper, we propose to use generalized superimposed pilot (GSP) scheme for URLLC transmission in massive multi-input multi-output (mMIMO) systems. Distinguishing from the conventional superimposed pilot (SP) scheme, the GSP scheme eliminates mutual interference between the pilot and data, where the data length is optimized, and the data symbols are precoded to spread over the whole transmission block. With the GSP scheme, we first formulate a weighted sum rate maximization problem by jointly optimizing the data length, pilot power, and data power and then derive closed-form results, including suboptimal data length and achievable rate lower bounds with maximum-ratio combining (MRC) and zero-forcing (ZF) detectors, respectively. Based on the closed-form results, we provide the corresponding iterative algorithms for the MRC and ZF cases where the problems are transformed into geometry program format by using log-function and successive convex approximation methods. Finally, the performance of the RP, SP, and GSP schemes are compared through simulation results, which reflect the superiority and robustness of the GSP scheme in URLLC scenarios. date: 2024-04-23 date_type: published publisher: Institute of Electrical and Electronics Engineers (IEEE) official_url: http://dx.doi.org/10.1109/tcomm.2024.3392806 oa_status: green full_text_type: other language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 2272447 doi: 10.1109/TCOMM.2024.3392806 lyricists_name: Wong, Kai-Kit lyricists_id: KWONG98 actors_name: Flynn, Bernadette actors_id: BFFLY94 actors_role: owner full_text_status: public publication: IEEE Transactions on Communications issn: 0090-6778 citation: Zhou, Xingguang; Zhu, Yongxu; Xia, Wenchao; Zhang, Jun; Wong, Kai-Kit; (2024) Optimized Payload Length and Power Allocation for Generalized Superimposed Pilot in URLLC Transmissions. IEEE Transactions on Communications 10.1109/TCOMM.2024.3392806 <https://doi.org/10.1109/TCOMM.2024.3392806>. (In press). Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10191999/1/Optimized_Payload_Length_and_Power_Allocation_for_Generalized_Superimposed_Pilot_in_URLLC_Transmissions.pdf