Computationally-Efficient Preamble Design Appropriate for Random Access Achieving Multi - Packet Reception

Kou Watanuki, Kenichi Higuchi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In random access with multi-packet reception for the 5th generation mobile communication system and beyond, the system prepares sufficient number of physical channel identifiers (PCIDs) in order to separate multiple user packet signals at the base station receiver. The base station receiver performs active user detection and channel estimation using preamble sequences, each of which has a one-to-one relationship with a PCID. As the number of PCIDs prepared in the system is increased, the computational complexity for active user detection and channel estimation becomes prohibitive. To address this problem, we propose three preamble sequence designs appropriate for random access achieving multi-packet reception. Assuming single-carrier transmission based on discrete Fourier transform (DFT)-spread orthogonal frequency division multiplexing (OFDM), the proposed methods construct the preamble sequence through repetition of the basic Zadoff-Chu (ZC) sequence, which is shorter than the length of one DFT block, with multiplication of the intra-DFT block orthogonal masking sequence. In this way, we reduce the computational complexity required for the correlation detection between the received signal and the preamble sequence. The cyclic-shifted ZC sequence-based intra-DFT block orthogonal masking mitigates the intra-DFT block interference caused by the multipath channel. Computer simulation results show quantitatively the effectiveness of the proposed methods.

Original languageEnglish
Title of host publication2021 IEEE 94th Vehicular Technology Conference, VTC 2021-Fall - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665413688
DOIs
Publication statusPublished - 2021
Event94th IEEE Vehicular Technology Conference, VTC 2021-Fall - Virtual, Online, United States
Duration: 27 Sep 202130 Sep 2021

Publication series

NameIEEE Vehicular Technology Conference
Volume2021-September
ISSN (Print)1550-2252

Conference

Conference94th IEEE Vehicular Technology Conference, VTC 2021-Fall
Country/TerritoryUnited States
CityVirtual, Online
Period27/09/2130/09/21

Fingerprint

Dive into the research topics of 'Computationally-Efficient Preamble Design Appropriate for Random Access Achieving Multi - Packet Reception'. Together they form a unique fingerprint.

Cite this