Unsourced random access using multiple stages of orthogonal pilots: MIMO and single-antenna structures

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buir.contributor.authorAhmadi, Mohammad Javad
buir.contributor.authorKazemi , Mohammad
buir.contributor.authorDuman , Tolga Mete
buir.contributor.orcidAhmadi, Mohammad Javad|0000-0002-7201-7800
buir.contributor.orcidKazemi, Mohammad|0000-0001-5177-1874
buir.contributor.orcidDuman, Tolga Mete|0000-0002-5187-8660
dc.citation.epage1355en_US
dc.citation.issueNumber2
dc.citation.spage1343
dc.citation.volumeNumber23
dc.contributor.authorAhmadi, Mohammad Javad
dc.contributor.authorKazemi, Mohammad
dc.contributor.authorDuman, Tolga Mete
dc.date.accessioned2024-03-19T11:29:03Z
dc.date.available2024-03-19T11:29:03Z
dc.date.issued2024-06-27
dc.departmentDepartment of Electrical and Electronics Engineering
dc.description.abstractWe study the problem of unsourced random access (URA) over Rayleigh block-fading channels with a receiver equipped with multiple antennas. We propose a slotted structure with multiple stages of orthogonal pilots, each of which is randomly picked from a codebook. In the proposed signaling structure, each user encodes its message using a polar code and appends it to the selected pilot sequences to construct its transmitted signal. Accordingly, the transmitted signal is composed of multiple orthogonal pilot parts and a polar-coded part, which is sent through a randomly selected slot. The performance of the proposed scheme is further improved by randomly dividing users into different groups each having a unique interleaver-power pair. We also apply the idea of multiple stages of orthogonal pilots to the case of a single receive antenna. In all the set-ups, we use an iterative approach for decoding the transmitted messages along with a suitable successive interference cancellation technique. The use of orthogonal pilots and the slotted structure lead to improved accuracy and reduced computational complexity in the proposed set-ups, and make the implementation with short blocklengths more viable. Performance of the proposed set-ups is illustrated via extensive simulation results which show that the proposed set-ups with multiple antennas perform better than the existing MIMO URA solutions for both short and large blocklengths, and that the proposed single-antenna set-ups are superior to the existing single-antenna URA schemes.
dc.description.provenanceMade available in DSpace on 2024-03-19T11:29:03Z (GMT). No. of bitstreams: 1 Unsourced_random_access_using_multiple_stages_of_orthogonal_pilots_MIMO_and_single-antenna_structures.pdf: 6051784 bytes, checksum: dd2e65325ed3f73cd8f7ac6e480e260f (MD5) Previous issue date: 2024-02-01en
dc.identifier.doi10.1109/TWC.2023.3288376
dc.identifier.eissn1558-2248
dc.identifier.issn1536-1276
dc.identifier.urihttps://hdl.handle.net/11693/114975
dc.language.isoEnglish
dc.publisherInstitute of Electrical and Electronics Engineers
dc.relation.isversionofhttps://dx.doi.org/10.1109/TWC.2023.3288376
dc.source.titleIEEE Transactions on Wireless Communications
dc.subjectUnsourced random access (URA)
dc.subjectThe Internet of Things (IoT)
dc.subjectOrthogonal pilots
dc.subjectMassive MIMO
dc.subjectPilot detection
dc.subjectPower diversity
dc.titleUnsourced random access using multiple stages of orthogonal pilots: MIMO and single-antenna structures
dc.typeArticle

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