Researcher:
Arslan, Emre

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Emre

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Arslan

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Arslan, Emre

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Now showing 1 - 8 of 8
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    Publication
    Coordinate interleaved OFDM with repeated in-phase/quadrature index modulation
    (IEEE-Inst Electrical Electronics Engineers Inc, 2024)  ; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Tuğtekin, Ömer Furkan; Doğukan, Ali Tuğberk; Arslan, Emre; Başar, Ertuğrul;  ; Graduate School of Sciences and Engineering; College of Engineering; Communications Research and Innovation Laboratory (CoreLab)
    Orthogonal frequency division multiplexing with index modulation (OFDM-IM), which transmits information bits through ordinary constellation symbols and indices of active subcarriers, is a promising multicarrier transmission scheme and has attracted the attention of researchers due to numerous benefits such as flexibility and simplicity. Nonetheless, OFDM-IM cannot satisfy the needs of future wireless communication services such as superior reliability, high data rates, and low complexity. In this article, we propose a novel OFDM-IM scheme named coordinate interleaved OFDM with repeated in-phase/quadrature IM (CI-OFDM-RIQIM), which provides superior error performance and enhanced spectral efficiency due to its diversity order of two and clever subcarrier activation pattern (SAP) detection mechanism, respectively. In addition, CI-OFDM-RIQIM is further extended to coordinate interleaved OFDM with in-phase/quadrature IM (CI-OFDM-IQIM) by doubling information bits transmitted by IM. Furthermore, log-likelihood ratio (LLR) based low-complexity detectors are designed for both proposed schemes. Theoretical analyses are performed and an upper bound on the bit error probability is derived. Comprehensive computer simulations under perfect and imperfect channel state information (CSI), are conducted to compare the proposed and reference schemes. It is shown that CI-OFDM-RIQIM and CI-OFDM-IQIM show superior results and can be considered promising candidates for next-generation wireless communication systems.
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    Publication
    A supervised learning-assisted partitioning solution for ris-aided noma systems
    (IEEE-Inst Electrical Electronics Engineers Inc, 2024)  ; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Gevez, Yarkın; Arslan, Emre; Başar, Ertuğrul;  ; Graduate School of Sciences and Engineering; College of Engineering;  
    Thanks to its capacity for producing intelligent radio environments that are both efficient and affordable, reconfigurable intelligent surfaces technology is gaining recognition as a potential solution for advanced communication systems. Efficient information processing is crucial for smart surfaces to effectively respond to electromagnetic signals, however achieving this requires additional resources such as computing time, storage, energy, and bandwidth. To address these challenges, model-agnostic methods such as machine learning can be an effective solution, as ML employs trainable variables to examine raw data and generate valuable outcomes. This study introduces a novel approach that integrates a hybrid RIS and utilizes an uplink non-orthogonal multiple access transmission from the users to the base-station. The proposed scheme utilizes supervised learning for RIS partitioning to optimize RIS element distribution that minimizes interference between users situated in the RIS's non-line-of-sight. The proposed system achieves similar achievable rates and fairness among users as the current advanced iterative algorithm described in existing literature, while significantly reducing the time and complexity involved. A theoretical outage probability formulation is derived along with computer simulations and comparisons presented to assess system outage and bit error probability results for varying quality-of-service conditions and successive interference cancellation scenarios.
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    Over-the-air equalization with reconfigurable intelligent surfaces
    (Inst Engineering Technology-Iet, 2022) N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Arslan, Emre; Yıldırım, İbrahim; Kılınç, Fatih; Başar, Ertuğrul; PhD Student; PhD Student; Researcher; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 282628; N/A; 149116
    Reconfigurable intelligent surface (RIS)-empowered communications is on the rise and is a promising technology envisioned to aid in 6G and beyond wireless communication networks. RISs can manipulate impinging waves through their electromagnetic elements enabling some sort of control over the wireless channel. The potential of RIS technology is explored to perform a sort of virtual equalization over-the-air for frequency-selective channels, whereas equalization is generally conducted at either the transmitter or receiver in conventional communication systems. Specifically, using an RIS, the frequency-selective channel from the transmitter to the RIS is transformed to a frequency-flat channel through elimination of inter-symbol interference (ISI) components at the receiver. ISI is eliminated by adjusting the phases of impinging signals particularly to maximize the incoming signal of the strongest tap. First, a general end-to-end system model is provided and a continuous to discrete-time signal model is presented. Subsequently, a probabilistic analysis for elimination of ISI terms is conducted and reinforced with computer simulations. Furthermore, a theoretical error probability analysis is performed along with computer simulations. It is analysed and demonstrated that conventional RIS phase alignment methods can successfully eliminate ISI, and the RIS-aided communication channel can be converted from frequency-selective to frequency-flat.
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    Publication
    Orthogonal frequency division multiplexing with codebook index modulation
    (IEEE, 2020) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Arslan, Emre; Doğukan, Ali Tuğberk; Başar, Ertuğrul; PhD Student; PhD Student; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 149116
    Ultra-reliable and low-latency communications (URLLC) partake a major role in future communication systems. A possible strong candidate for future URLLC networks is sparse vector coding (SVC), which enables a superior performance in terms of bit error rate (BER). In SVC, virtual digital domain (VDD) and compressed sensing (CS) algorithms are used to encode and decode information. In this paper, orthogonal frequency division multiplexing (OFDM)-based a novel system called orthogonal frequency division multiplexing with codebook index modulation (OFDM-CIM) and which can meet the needs of URLLC systems has been proposed. In OFDM-CIM, information bits are transmitted via both active subcarrier indices and codebook indices. As a result of computer simulations, OFDM-CIM is presented as a strong candidate for next generation communication systems./ Öz: Yüksek güvenilirlik ve düşük gecikmeli haberleşme (ultra-reliable and low-latency communications, URLLC), gelecek nesil iletişim sistemlerinde önemli bir rol alacaktır. Bit hata oranı (bit error rate, BER) açısından üstün bir performans sağlayan seyrek vektör kodlama (sparse vector coding, SVC), gelecek URLLC ağları için önemli bir aday olarak dikkat çekmektedir. SVC’de bilgileri kodlamak ve çözmek için sanal sayısal bölge (virtual digital domain, VDD) ve sıkıştırılmış algılama (compressed sensing, CS) algoritmaları kullanılmaktadır. Bu çalışmada, Kod kitabı indis modülasyonlu dik frekans bölmeli çoğullama (OFDM-CIM) olarak adlandırılan, OFDM tabanlı ve URLLC sistemlerinin ihtiyaçlarına cevap verebilecek özgün bir sistem önerilmektedir. OFDM-CIM, bilgi bitlerini hem etkin alt taşıyıcı indisleri ile hem de kod kitabı indisleri ile iletmektedir. Yapılan bilgisayar benzetimleri sonucunda, OFDM-CIM gelecek nesil haberleşme sistemleri için güçlü bir aday olarak sunulmaktadır.
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    Publication
    Index modulation-based flexible non-orthogonal multiple access
    (IEEE-Inst Electrical Electronics Engineers Inc, 2020) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Arslan, Emre; Doğukan, Ali Tuğberk; Başar, Ertuğrul; PhD Student; PhD Student; Faculty Member; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 149116
    Non-orthogonal multiple access (NOMa) is envisioned as an efficient candidate for future communication systems. This letter proposes a novel orthogonal frequency division multiplexing (ofDM) with index modulation (IM)-based NOMa scheme, called ofDM-IM NOMa, for future multi-user communication systems. inspired by IM and classical NOMa-ofDM, users utilize flexibility by adjusting power allocation factors and subcarrier activation ratios. Our new scheme allows different service users to share available resources as in classical NOMa, more efficiently. It is shown that ofDM-IM NOMa reliably supports a high and low data rate user at the same resources by adjusting their subcarrier activation ratios.
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    Publication
    Reconfigurable intelligent surface enabled over-the-air uplink NOMA
    (IEEE, 2023) Çelik, Abdülkadir; Arzykulov, Sultangali; Eltawil, Ahmed M.; Department of Electrical and Electronics Engineering; (TBD); N/A; N/A; Department of Electrical and Electronics Engineering; (TBD); Başar, Ertuğrul; Kılınç, Fatih; Doğukan, Ali Tuğberk; Arslan, Emre; Faculty Member; Researcher; PhD Student; PhD Student; College of Engineering; N/A; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 149116; N/A; N/A; N/A
    Innovative reconfigurable intelligent surface (RIS) technologies are rising and recognized as promising candidates to enhance 6G and beyond wireless communication systems. RISs acquire the ability to manipulate electromagnetic signals, thus, offering a degree of control over the wireless channel and the potential for many more benefits. Furthermore, active RIS designs have recently been introduced to combat the critical double fading problem and other impairments passive RIS designs may possess. In this paper, the potential and flexibility of active RIS technology are exploited for uplink systems to achieve virtual non-orthogonal multiple access (NOMA) through power disparity over-the-air rather than controlling transmit powers at the user side. Specifically, users with identical transmit power, path loss, and distance can communicate with a base station sharing time and frequency resources in a NOMA fashion with the aid of the proposed hybrid RIS system. Here, the RIS is partitioned into active and passive parts and the distinctive partitions serve different users aligning their phases accordingly while introducing a power difference to the users’ signals to enable NOMA. First, the end-to-end system model is presented considering two users. Furthermore, outage probability calculations and theoretical error probability analysis are discussed and reinforced with computer simulation results.
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    Publication
    Orthogonal frequency division multiplexing with codebook index modulation
    (Institute of Electrical and Electronics Engineers Inc., 2020) Department of Electrical and Electronics Engineering; N/A; N/A; Department of Electrical and Electronics Engineering; Başar, Ertuğrul; Doğukan, Ali Tuğberk; Arslan, Emre; Faculty Member; PhD Student; PhD Student; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 149116; N/A; N/A
    Ultra-reliable and low-latency communications (URLLC) partake a major role in future communication systems. A possible strong candidate for future URLLC networks is sparse vector coding (SVC), which enables a superior performance in terms of bit error rate (BER). In SVC, virtual digital domain (VDD) and compressed sensing (CS) algorithms are used to encode and decode information. In this paper, orthogonal frequency division multiplexing (OFDM)-based a novel system called orthogonal frequency division multiplexing with codebook index modulation (OFDM-CIM) and which can meet the needs of URLLC systems has been proposed. In OFDM-CIM, information bits are transmitted via both active subcarrier indices and codebook indices. As a result of computer simulations, OFDMCIM is presented as a strong candidate for next generation communication systems.
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    PublicationOpen Access
    Sparse-encoded codebook index modulation
    (Institute of Electrical and Electronics Engineers (IEEE), 2020) Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Arslan, Emre; Doğukan, Ali Tuğberk; Başar, Ertuğrul; Faculty Member; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; 149116
    Ultra-reliable and low-latency communications (URLLC) partakes a major role in 5 G networks for mission-critical applications. Sparse vector coding (SVC) appears as a strong candidate for future URLLC networks by enabling superior performance in terms of bit error rate (BER). SVC exploits the virtual digital domain (VDD) and compressed sensing (CS) algorithms to encode and decode its information through active symbol indices. In this paper, first, a clever encoding/decoding algorithm is proposed for the SVC scheme, which allows the use of all possible activation patterns (APs) resulting in increasing spectral efficiency. Second, a novel solution is proposed to convey additional information bits by further exploiting index modulation (IM) for the codebooks of the SVC scheme. Computer simulation results reveal that our low-complexity algorithm and novel IM solution provide not only a superior BER performance but also an increase in the number of bits conveyed by IM compared to the ordinary SVC approach.