OFDM-AIM İletim Tekniği için Karınca Kolonisi Optimizasyon Algoritması Tabanlı Alt-Blok Set Tasarımı

Year 2021, Volume: 13 Issue: 2, 478 - 488, 18.06.2021

Mahmut Yıldırım

https://doi.org/10.29137/umagd.859150

Abstract

OFDM-IM (İndeks Modülasyonlu Dikgen Frekans Bölmeli Çoğullama), 5G (Beşinci Nesil) ve ötesi iletişim sistemleri için aday iletim tekniklerinden birisi olarak son yıllarda üzerinde birçok çalışma gerçekleştirilmiştir. OFDM-IM'nin spektral verimliliğinin artırılması amacıyla geliştirilen OFDM-AIM (Tüm İndeks Modülasyonlu OFDM) tekniğinde, boş alt-taşıyıcıların bulunduğu OFDM-IM'den farklı olarak tüm alt-taşıyıcılar aktif duruma getirilmiştir. Bu makalede, OFDM-AIM'in bit hata oranı (BHO) performansının iyileştirilmesi için Karınca Kolonisi Optimizasyonu (KKO) algoritması tabanlı bir alt-blok set tasarımı önerilmiştir (KKO-OFDM-AIM). OFDM-AIM tekniğinde veri bitleri, PSK/QAM takımyıldızı noktaları ile eşleştirilirken önerilen KKO-OFDM-AIM tekniğinde, çeşitlilik kazancının artırılması amacıyla PSK/QAM takımyıldızı uzayının tamamı olası eşleştirme noktaları olarak değerlendirilir. KKO-OFDM-AIM tekniğinde, en yüksek uygunluk değerine sahip eşleştirme noktaları KKO algoritması tarafından belirlenerek alt-blok seti oluşturulur. Simülasyon çalışmalarında KKO-OFDM-AIM tekniği, OFDM, OFDM-IM, OFDM-AIM ve GA-OFDM-AIM (Genetik algoritma tabanlı OFDM-AIM) teknikleri ile karşılaştırılmış ve en iyi BHO başarısına sahip olduğu görülmüştür.

Keywords

5G, OFDM, OFDM-IM, OFDM-AIM, Karınca Kolonisi Optimizasyonu

Ant Colony Optimization Algorithm Based Sub-Blocks Set Design for OFDM-AIM Transmission Technique

Abstract

OFDM-IM (Orthogonal Frequency Division Multiplexing with Index Modulation) as one of the candidate transmission techniques for 5G (Fifth Generation) and beyond communication systems, many studies have been carried out in recent yeaars. In the OFDM-AIM (OFDM with All Index Modulation) technique, which has developed to increase the spectral efficiency of the OFDM-IM, unlike the OFDM-IM which has empty sub-carriers, all sub-carriers are active. In this article, Ant Colony Optimization (ACO) algorithm based sub-block set design (ACO-OFDM-AIM) is proposed to improve the bit error rate (BER) performance of the OFDM-AIM. In the OFDM-AIM technique, data bits are matched with PSK/QAM constellation points, while in the KKO-OFDM-AIM technique, the entire PSK/QAM constellation space can be determined as possible mapping points in order to increase diversity gain. In the ACO-OFDM-AIM technique, the matching points with the highest fitness value are determined by the ACO algorithm and a sub-block set is created. In simulation studies, the ACO-OFDM-AIM technique is compared with OFDM, OFDM-IM, OFDM-AIM, and GA-OFDM-AIM (Genetic algorithm-based OFDM-AIM) techniques and it is seen that ACO-OFDM-AIM has the best BER performance.

Keywords

5G, OFDM, OFDM-IM, OFDM-AIM, Ant Colony Optimization

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