1 Ocak 2024 Dergi makalesi Açık Erişim

Ahmadi, Mohammad Javad; Kazemi, Mohammad; Duman, Tolga M.

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  <identifier identifierType="URL">https://aperta.ulakbim.gov.tr/record/280643</identifier>
  <creators>
    <creator>
      <creatorName>Ahmadi, Mohammad Javad</creatorName>
      <givenName>Mohammad Javad</givenName>
      <familyName>Ahmadi</familyName>
      <affiliation>Bilkent Univ, Dept Elect &amp; Elect Engn, TR-06800 Ankara, Turkiye</affiliation>
    </creator>
    <creator>
      <creatorName>Kazemi, Mohammad</creatorName>
      <givenName>Mohammad</givenName>
      <familyName>Kazemi</familyName>
      <affiliation>Bilkent Univ, Dept Elect &amp; Elect Engn, TR-06800 Ankara, Turkiye</affiliation>
    </creator>
    <creator>
      <creatorName>Duman, Tolga M.</creatorName>
      <givenName>Tolga M.</givenName>
      <familyName>Duman</familyName>
      <affiliation>Bilkent Univ, Dept Elect &amp; Elect Engn, TR-06800 Ankara, Turkiye</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Unsourced Random Access Using Multiple Stages Of Orthogonal Pilots: Mimo And Single-Antenna Structures</title>
  </titles>
  <publisher>Aperta</publisher>
  <publicationYear>2024</publicationYear>
  <dates>
    <date dateType="Issued">2024-01-01</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://aperta.ulakbim.gov.tr/record/280643</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1109/TWC.2023.3288376</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://www.opendefinition.org/licenses/cc-by">Creative Commons Attribution</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;We 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.&lt;/p&gt;</description>
  </descriptions>
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