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C-MRC TABANLI KİPLEME ÇÖZ VE İLET PROTOKOLÜ İLE İKİ YÖNLÜ RÖLELİ KANALLARDA BİRLEŞİK AĞ-KANAL KODLAMASI

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JOINT NETWORK-CHANNEL CODING WITH C-MRC BASED DEMODULATE AND FORWARD PROTOCOL IN TWO-WAY RELAY CHANNELS

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Sayfa Aralığı:: 
103-113

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Abstract (Original Language): 
Sayısal aktarma tabanlı işbirlikli telsiz ağlarının sistem karmaşıklığını ve enerji sarfiyatını azaltmak için yapılan araştırma faaliyetleri rölenin aldığı işaretlerde kod çözme yerine kipleme çözme yaptığı kipleme çöz ve ilet tasarımını ortaya çıkarmıştır. Öte yandan işbirlikli en yüksek oranlı birleştirme (İEYOB), iletim verimini düşüren çevrimsel artıklık denetimi (ÇAD) kodlardan faydalanmaksızın sayısal aktarmada hata yayılımı ile mücadele etmede kullanılan yüksek performanslı düşük karmaşıklıklı önemli bir başka tekniktir. Bu çalışmada iki kullanıcının bir röle aracılığı ile veri alışverişi yaptığı iki yönlü röle kanalları için İEYOB tabanlı kipleme çöz ve ilet protokolünü önerilmektedir. İletim süresi, birinci ve ikinci fazların kullanıcıların kodlamasız veya konvolüsyonel kodlamalı verilerinin iletimine tahsis edildiği zamanda üç faza ayrılmıştır. Röle, demodülasyondan sonra bit düzeyinde XOR‟lanmış paketi üçüncü fazda kullanıcılara iletmektedir. Rayleigh sönümlemeli kanallardaki sayısal sonuçlar önerilen yaklaşımın tam çeşitleme seviyesi sağladığını göstermektedir.
Abstract (2. Language): 
Research activities to reduce the system complexity and energy consumption of digital relaying based cooperative wireless networks have yielded the demodulate-forward scheme where the relay performs demodulation, instead of decoding, on the received signals. On the other hand, cooperative maximal ratio combining (C-MRC) is another high-performance low-complexity technique used to combat error propagation in digital relaying without exploiting CRC codes which decreases the transmission efficiency. In this study, we propose a C-MRC based demodulate and forward protocol for two-way relay channels where two users exchange information via a relay. The transmission is divided into three phases in time where the first and second phases are allocated to the transmissions of uncoded or convolutionally encoded data of the users. After demodulation, the relay broadcasts the bit-wise XOR-ed packet to the users in the third phase. The numerical results for Rayleigh fading show that the proposed approach provides full diversity gain.

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REFERENCES

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