Tam-Çift-Yönlü AF Röle Seçim Sistemlerinin Nakagami-m Kanallardaki Performansı

Bu çalışmada tam-çift-yönlü kuvvetlendir-ve-aktar tekniğini kullanan röle seçimli işbirlikli iletişim sistemlerin, artık öz-girişimin varlığı altında, Nakagami-m kanallardaki kesinti performansı incelenmiştir. Önerilen sistemde, tam-çift-yönlü aktarımın başarımını geliştirmek için beş farklı röle seçim kriteri kullanılmaktadır. Tüm röle seçim kriterleri için birikimli dağılım fonksiyonu yaklaşımı kullanılarak, tam kesinti olasılığı tek katlı integral biçiminde bulunmuştur. Elde edilen analitik sonuçlar, Monte-Carlo benzetimleri ile doğrulanmıştır. Nümerik sonuçlar ile kesinti performansını en çok geliştiren röle seçim kriterinin -tüm kanal durum bilgilerine ihtiyaç duyan- en iyi röle seçim kriteri olduğu gösterilmiştir. Buna ek olarak, yine tüm röle seçim kriterleri için, kesinti olasılığının kapalı formda alt sınır ve asimptotik ifadeleri elde edilmiştir. Röle düğümünden kaynaklanan artık öz-girişimin sistemin performansını kısıtladığı ve hata sınırlarının oluştuğu gözlemlenmiş olup, hata sınırlarının elde edilen asimptotik ifadeler ile kolayca belirlenebileceği gösterilmiştir.

Performance of Full-Duplex AF Relay Selection Systems over Nakagami-m Channels

In this paper, outage performance of full-duplex amplifyand-forward relay selection systems under residual loop-interference over Nakagami-m fading channels is investigated. In order to investigate the performance of full-duplex relaying, five different relay selection policies are used in the proposed system. By using cumulative distribution function approach, the exact outage probability expressions are obtained in a single-integral form for each relay selection policies. The theoretical results are verified with Monte-Carlo simulations. The numerical results reveal that the best relay selection policy is the optimal relay selection policy which requires all channel state information. Additionally, lower-bound and asymptotic outage probability expressions are obtained in a closedform for each relay selection policies. The residual loop-interference at relay node limits the performance of system and creates error floors which can be determined easily by using the derived asymptotic expressions.

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