Researcher:
Arslan, Emre

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PhD Student

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Emre

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Arslan

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Arslan, Emre

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2020 - 20236

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Researcher Of Publications: search.filters.isAuthorOfPublication.75fefe2e-3698-4a8c-aedb-317ae0a7e1fa

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Now showing 1 - 6 of 6
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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; Arslan, Emre; Yıldırım, İbrahim; Kılınç, Fatih; Başar, Ertuğrul; PhD Student; PhD Student; Researcher; Faculty Member; Department of Electrical and Electronics Engineering; 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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    Orthogonal frequency division multiplexing with codebook index modulation
    (IEEE, 2020) N/A; N/A; Department of Electrical and Electronics Engineering; Arslan, Emre; Doğukan, Ali Tuğberk; Başar, Ertuğrul; PhD Student; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; 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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    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; Arslan, Emre; Doğukan, Ali Tuğberk; Başar, Ertuğrul; PhD Student; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; 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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    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; Başar, Ertuğrul; Kılınç, Fatih; Doğukan, Ali Tuğberk; Arslan, Emre; Faculty Member; Researcher; PhD Student; PhD Student; Department of Electrical and Electronics Engineering; (TBD); 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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    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; Başar, Ertuğrul; Doğukan, Ali Tuğberk; Arslan, Emre; Faculty Member; PhD Student; PhD Student; Department of Electrical and Electronics Engineering; 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; Arslan, Emre; Doğukan, Ali Tuğberk; Başar, Ertuğrul; Faculty Member; Department of Electrical and Electronics Engineering; 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.