1 Ocak 2021 Dergi makalesi Açık Erişim

Thet, Nann Win Moe; Ozdemir, Mehmet Kemal

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    <subfield code="a">Partial-Beam Non-Orthogonal Multiple Access (PB-NOMA) With Fuzzy Clustering</subfield>
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    <subfield code="a">This letter proposes a partial-beam non-orthogonal multiple access (PB-NOMA) system for millimeter wave (mmWave) channels. In the proposed system, the user terminals (UT)s partially belong to different user groups and power-domain partial NOMA (P-NOMA) technique is exploited in their allocated spectrum. While an individual beam serves the UTs in one group, the UTs in the same group, including the overlapped beam UTs, employ the P-NOMA scheme. Overlapped beam UTs are present when two near UTs are closely correlated and when they are equally belonging to two user groups. Fuzzy C-means (FCM) clustering method, which considers the channel correlation coefficient as a similarity measure, is proposed to group the users. Then, user pairing is performed based on the channel gain differences and fuzzy membership values. Simulation results reveal that the sum-rate performance of the proposed PB-NOMA scheme with fuzzy clustering is shown to be better than that of the conventional P-NOMA systems by adjusting overlapped beam ratio (OBR) and lower near UT overlap ratio (NOR) in a preferable group.</subfield>
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    <subfield code="u">Istanbul Medipol Univ, Sch Engn &amp; Nat Sci, TR-34810 Istanbul, Turkey</subfield>
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    <subfield code="a">10.1109/LWC.2021.3061779</subfield>
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