Yazar "Karabulut, Muhammet Ali" seçeneğine göre listele

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    Differential Modulation Based Network Coded Cooperative Communications
    (IEEE, 2015) Karabulut, Muhammet Ali; Ilhan, Haci; Ozdemir, Ozgur
    Multiple access relay channel (MARC) where multiple users communicate with a common destination via a relay, is an innovative approach and one of the most important network coding applications in wireless cooperative communications in recent years. In this paper, noncoherent differential binary phase shift keying (DPSK) technique which eliminates the need for channel estimation cost is applied to the MARC system model that uses maximum likelihood detection approach at the common destination. Noncoherent DPSK modulation of the MARC system model provides full diversity gain that has been observed at the resulting Monte-Carlo simulation.
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    The Effect of Co-channel Interference in DF Based MARC System with Relay Selection
    (IEEE, 2017) Karabulut, Muhammet Ali; Aslan, Hayri; Ozdemir, Ozgur; Ilhan, Haci
    Network coding has recently received significant attention as an innovative approach to improve the throughput of wireless communication systems. The multiple access relay channel (MARC), in which multiple users communicate with a common destination via relays, is one of the important network coding applications for wireless cooperative communications. In this paper, the effect of co-channel interference in decode-and forward (DF) based MARC model with relay selection is investigated by obtaining the average bit error rate (BER) results of the proposed system for cascaded Rayleigh fading channels. The simulation results obtained by using binary phase shift keying (BPSK) modulation have shown that the proposed system overcome diversity gain reduction due to error propagation, and detrimental effects of the co-channel interference.
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    Link Adaptive Relaying with Noncoherent BFSK and DPSK Modulations in Multiple Access Relay Channels
    (IEEE, 2015) Karabulut, Muhammet Ali; Ozdemir, Ozgur; Ilhan, Haci
    Network coding has recently received significant attention as an innovative approach to improve the throughput of wireless communication systems. The multiple access relay channel (MARC), in which multiple users communicate with a common destination via a relay, is one of the important network coding applications for wireless cooperative communications. In this paper, link adaptive relaying (LAR) approach which combats performance degradation due to error propagation in digital relaying based wireless networks has been applied to the MARC model with noncoherent binary frequency shift keying (BFSK) and differential binary phase shift keying (DPSK) signalings which are among the prominent techniques for eliminating the need for channel estimation by training sequences. Simulation results for Nakagami-m fading channels have shown that the proposed MARC model with LAR scheme outperforms the noncooperative system that involves direct transmissions and overcome the diversity gain reduction due to error propagation.
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    Network Coded Noncoherent Cooperative Communications
    (IEEE, 2014) Karabulut, Muhammet Ali; Ilhan, Haci; Ozdemir, Ozgur
    In recent years, network coding has received significant attention as an innovative approach that improves the spectral efficiency of wireless communication systems. The Multiple Access Relay Channel (MARC) where multiple users communicate with a common destination via a relay, is one of the important network coding applications in wireless cooperative communications. In this paper, error performance of MARC system non-coherent BFSK technique is studied. This technique, which employs training sequences, is a prominent approach for decreasing the system complexity and cost by eliminating the need for channel estimation. The numerical results for Rayleigh fading channels have shown that proposed approach provides full diversity gain.
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    Relaying Selection Based Multiple Access Relay Channel
    (IEEE, 2016) Karabulut, Muhammet Ali; Ozdemir, Ozgur; Ilhan, Haci
    Relay selection in case of fast cascade Rayleigh fading channels has been examined in multiple access relay channel structure which is one of the high spectral efficiency network coding applications. Error performance analysis of MARC system has been made for noncoherent binary frequency shift keying (BFSK) and it has been shown that the proposed approach provides full diversity gain.