Alamouti Uzay-Zaman Blok Kodlamalı İHA-Yardımlı NOMA-Tabanlı Haberleşme Ağı

Öz

Bu çalışmada İnsansız Hava Aracı (İHA) yardımıyla oluşturulmuş aşağı yönde Dikgen Olmayan Çoklu Erişim (DOÇE) temelli ve 3 kullanıcılı bir sistem ağı düşünülmüştür. Ağda İHA yerdeki kullanıcıların her biri ile Alamouti Uzay-Zaman Blok Kodlama (A-UZBK) tekniğini kullanarak 2 anten üzerinden haberleşmektedir. Ayrıca kullanıcıların tek antenli ve iki antenli olarak tasarlandığı düşünülen 2 farklı haberleşme senaryosu üzerinde durulmuştur. Bu çalışmada A-UZBK tekniğinin İHA destekli aşağı yönde DOÇE temelli haberleşme ağlarında kullanımının ve ağda bulunan yerdeki alıcılarda ve vericide anten çeşitlemesinin artmasının sistemin performansına etkilerini anlamak amacıyla simülasyonlar gerçekleştirilmiştir. Önerilen haberleşme sisteminin performansını kıyaslamak amacıyla, İHA ve yerdeki kullanıcıların tek anten olarak tasarlandığı bir aşağı yönde DOÇE ağı kullanılmıştır. Yapılan Monte-Carlo simülasyon sonuçlarında, sistemde A-UZBK tekniğinin kullanılması ve çeşitlemenin arttırılmasıyla birlikte Yol Kaybı (YK) ve çevresel faktörlerden kaynaklı bozucu etkenlerin hata performansı üzerine etkileri incelenmiştir. Özellikle yüksek Sinyal-Gürültü Oranı (SGO) değerlerinde bu bozucu etkenlerin hata performansı üzerine etkilerinin oldukça minimize edildiği gözlemlenmiştir. Ayrıca, sistemde A-UZBK tekniği kullanımı ve çeşitlemenin artması, oldukça iyi seviyede SNR kazancı sağlamıştır. Dahası, İHA-Destekli aşağı yönde NOMA-Tabanlı iletişim sisteminde A-STBC tekniği kullanıldığında tam çeşitleme kazancının elde edilebileceği gözlemlenmiştir.

Anahtar Kelimeler

• Dikgen olmayan çoklu erişim
• insansız hava araçları
• A-UZBK
• çeşitleme
• bit hata oranı

UAV-Assisted NOMA-Based Network with Alamouti Space-Time Block Coding

Öz

In this study, a 3-user system was considered in the Unmanned Aerial Vehicle-Assisted (UAV-Assisted) Non-Orthogonal Multiple Access-Based (NOMA-Based) communication network. In the network, UAV communicates with users on the ground via two antennas using the Alamouti Space-Time Block Coding (A-STBC) technique. It is considered that there are two separate scenarios where user links are designed with one antenna and two antenna systems. In the study, Monte-Carlo simulations were carried out to understand the effects of using the A-STBC technique in UAV-Assisted NOMA-Based communication networks and increased antenna diversity in receiver and transmitter in the network to the performance of the system. For the benchmark, the downlink NOMA network was used, where the receivers and the UAV are designed with a single antenna. In the simulation results, with the A-STBC technique in the system and increase in diversity, the effects of Path Loss (PL) and environmental factors on error performance were examined. Especially in high Signal to Noise Ratio (SNR) values, it has been observed that the effects of these destructive factors on error performance are highly minimized. Also, the use of A-STBC technique and the increase in diversity in the system provided considerable SNR gain. Moreover, it has been observed that full diversity gain can be achieved when the A-STBC technique is used in the UAV-Assisted downlink NOMA-Based communication system.

Anahtar Kelimeler

• Non-orthogonal multiple access
• unmanned aerial vehicles
• A-STBC
• diversity
• bit error rate

Kaynakça

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