1 Ocak 2017 Dergi makalesi Açık Erişim

Heidarpour, Ali Reza; Kurt, Gunes Karabulut; Uysal, Murat

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    <subfield code="a">Finite-SNR Diversity-Multiplexing Tradeoff for Network Coded Cooperative OFDMA Systems</subfield>
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    <subfield code="a">Network-coded cooperation (NCC) is an effective method to improve the throughput efficiency in cooperative wireless networks. The combined use of orthogonal frequency division multiplexing (OFDM) with NCC has been further studied in the literature to exploit the multipath diversity gains. In this paper, we consider orthogonal frequency division multiple access (OFDMA), an extension of OFDM to a multiuser system where subsets of carriers are assigned to different users. We first derive a closed-form expression for the outage probability of NCC-OFDMA over Rician fading channels and then present the asymptotical and finite-SNR DMT expressions. Our results provide insight into the performance mechanisms under practical SNR regime of NCC-OFDMA systems and demonstrate that NCC-OFDMA is able to fully exploit both frequency and spatial diversity. We also show that the derived finite-SNR DMT converges to an asymptotical one as expected. Furthermore, special cases for our derived analytical expressions are presented, to show that the derived expression is a generalized case of the related the state of the art results. Simulation results are further presented to verify our theoretical analyses.</subfield>
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    <subfield code="u">Istanbul Tech Univ, Dept Commun &amp; Elect Engn, TR-34469 Istanbul, Turkey</subfield>
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