DM-OFDM Sistemlerinin Donanım Kusurları ve Çeşitli Kanal Koşulları Altında Performans Analizi

Yıl 2025, Cilt: 7 Sayı: 1, 111 - 119, 30.04.2025

Miraç Muncuk , İbrahim Develi , Mahmut Yıldırım , Büşra Karahan

https://doi.org/10.46387/bjesr.1659441

Öz

Bu çalışma, donanım kusurları ve değişken kanal koşulları altında Çift modlu indis modülasyonu destekli ortogonal frekans bölmeli çoğullama (DM-OFDM) sistemlerinin performansını incelemektedir. Çift modluluğun sağladığı spektral verimlilik, klasik indis modülasyonlu OFDM (OFDM-IM) ile karşılaştırmalı olarak Rayleigh ve Rician sönümlü kanallarında analiz edilmiştir. Faz gürültüsü ve IQ dengesizliği gibi pratik donanım kusurları modele dahil edilerek etkileri değerlendirilmiştir. Farklı alt taşıyıcı sayıları (N=64/128/256) ve aktif alt taşıyıcı konfigürasyonları (K=1/2/3) için yapılan simülasyonlar, DM-OFDM’in her iki kanal koşulunda da klasik OFDM-IM’den üstün bit hata oranı (BER) performansı sağladığını göstermektedir. Yüksek sinyal gürültü oranı (SNR) bölgelerinde donanım bozulmalarına bağlı hata tabanı oluştuğu gözlemlenmiş ve bu etkinin sistem tasarımında dikkate alınması gerektiği vurgulanmıştır. Alt taşıyıcı sayısının artırılması ve aktif taşıyıcı seçiminin optimize edilmesi performansı iyileştirirken, Rician kanalındaki görüş hattı bileşeni performansı daha da artırmaktadır.

Anahtar Kelimeler

OFDM , İndis Modülasyonu , Donanım Kusurları , Bit Hata Oranı

Performance Analysis of DM-OFDM Systems Under Hardware Impairments and Various Channel Conditions

Öz

This study investigates the performance of Dual-mode index modulation aided orthogonal frequency division multiplexing (DM-OFDM) systems under hardware impairments and varying channel conditions. The spectral efficiency provided by dual-mode operation is analyzed in comparison to conventional index modulation OFDM (OFDM-IM) over Rayleigh and Rician fading channels. Practical hardware impairments, such as phase noise and IQ imbalance, are incorporated into the model to evaluate their effects. Simulations conducted for different subcarrier numbers (N=64/128/256) and active subcarrier configurations (K=1/2/3) demonstrate that DM-OFDM outperforms conventional OFDM-IM in terms of bit error rate (BER) performance under both channel conditions. In high signal to noise ratio (SNR) regions, an error floor caused by hardware distortions is observed, emphasizing the need to consider this effect in system design. While increasing the number of subcarriers and optimizing active subcarrier selection enhances performance, the line-of-sight component in the Rician channel further improves the system's performance.

Anahtar Kelimeler

OFDM , Index Modulation , Hardware Impairments , Bit Error Rated

Kaynakça

• E. Basar, “Index modulation techniques for 5G wireless networks,” IEEE Communications Magazine, vol. 54, no. 7, pp. 168–175, July 2016.
• M. D. Renzo, H. Haas, A. Ghrayeb, S. Sugiura, and L. Hanzo, “Spatial modulation for generalized MIMO: challenges, opportunities, and implementation,” Proceedings of the IEEE, vol. 102, no. 1, pp. 56-103, 2014.
• L. Dai, B. Wang, Z. Ding, Z. Wang, S. Chen, L. Hanzo, “A survey of non-orthogonal multiple access for 5G,” IEEE Commun. Surveys \& Tutorials, vol. 20, no. 3, 2018.
• Y. S. Cho, J. Kim, W. Y. Yang, and C. G. Kang, MIMO-OFDM Wireless Communications with MATLAB, John Wiley & Sons, New York, 2010.
• A. T. Doğukan, O. F. Tuğtekin, E. Başar, "Coordinate Interleaved OFDM with Power Distribution Index Modulation," IEEE Communications Letters, vol. 26, no. 8, pp. 1908-1912, Aug. 2022.
• S. Doğan, A. Tusha, H. Arslan, "OFDM with Index Modulation for Asynchronous mMTC Networks," Sensors, vol. 18, no. 4, p. 1280, Apr. 2018.
• B. Farhang-Boroujeny, “OFDM versus filter bank multicarrier,” IEEE Signal Processing Magazine, vol. 28, no. 3, pp. 92–112, 2011.
• E. Başar, "OFDM with Index Modulation Using Coordinate Interleaving," IEEE Wireless Communications Letters, vol. 4, no. 4, pp. 381-384, Dec. 2015.
• E. Başar, Ü. Aygölü, E. Panayırcı, H. V. Poor, “Orthogonal frequency division multiplexing with index modulation,” IEEE Transactions on Signal Processing, vol. 61, no. 22, 2013.
• T. Mao, Z. Wang, Q. Wang, S. Chen, and L. Hanzo, “Dual-mode index modulation aided OFDM,” IEEE Access, vol. 5, pp. 50–60, 2017.
• M. Wen, E. Basar, Q. Li, B. Zheng, and M. Zhang, “Multiple-mode orthogonal frequency division multiplexing with index modulation,” IEEE Transactions on Communications, vol. 65, no. 9, pp. 3892–3906, Sep. 2017.
• J. Choi, “On the design of OFDM systems for low-resolution ADCs, ” IEEE Transactions on Wireless Communications, vol. 18, no. 6, pp. 3133-3145, 2019.
• M. F. Flanagan, “Performance analysis of OFDM with I/Q imbalance in fading channels,” IEEE Transactions on Wireless Communications, vol. 6, no. 1, pp. 25–35, Jan. 2007.
• M. Shehata and A. Mohammadi, “On the impact of hardware impairments on the performance of full-duplex OFDM transceivers,” IEEE Transactions on Communications, vol. 67, no. 3, pp. 1890–1905, Mar. 2019.
• I. Aboharba, "Orthogonal Frequency Division Multiplexing System with Index Modulations for Wireless Communication," The University of Western Ontario (Canada), 2022.
• L. Hanzo, M. Münster, B. J. Choi, and T. Keller, OFDM and MC-CDMA for Broadband Multi-User Communications, WLANs and Broadcasting, Wiley, 2003.
• A. Gökçeoglu and E. Basar, “Reconfigurable intelligent surface-aided index modulation: Opportunities and challenges,” IEEE Open Journal of the Communications Society, vol. 5, pp. 332–350, 2024.
• X. Cheng, B. Ai, Y. Shi, Y. Zhao, and Z. Han, “Physical layer security for 5G wireless networks: A comprehensive survey,” IEEE Communications Surveys & Tutorials, vol. 21, no. 1, pp. 368–403, 2019.
• T. Hwang, C. Yang, G. Wu, S. Li, and G. Y. Li, “OFDM and its wireless applications: A survey,” IEEE Transactions on Vehicular Technology, vol. 58, no. 4, pp. 1673–1694, 2009.