Yazar "Rafique, Saira" seçeneğine göre listele

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    A novel frame design for integrated communication and sensing based on position modulation
    (Institute of Electrical and Electronics Engineers Inc., 2021) Rafique, Saira; Arslan, Hüseyin
    In this paper, a novel frame design for integrated communication and sensing is proposed. The proposed frame structure consists of Barker radar sequence and binary phase shift keying (BPSK) modulated data bits. The temporal position of the radar sequence is determined by a subset of incoming information bits. Therefore, in addition to target sensing; the radar sequence also carries data bits in the form of position modulation. Moreover, during the reception process channel estimation is also performed using the radar sequence thereby leveraging the function of pilots. The simulation results verify that the dynamic location of radar sequence does not effect the sensing performance; however, sensing is sensitive to the length of radar sequence. Moreover, the proposed scheme results in reduced bit error rate (BER) when compared to radar-communication frame without any position modulation.
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    A novel frame design for non-terrestrial network based integrated sensing and communication
    (Institute of Electrical and Electronics Engineers Inc., 2022) Naeem, Ahmed; Rafique, Saira; Arslan, Hüseyin
    In this paper, a novel frame design is proposed which realizes integrated sensing and communication (ISAC) while developing synergy among non-Terrestrial (NTN) and terrestrial networks. Conventional time division duplexing (TDD) based systems suffer from high latency in sensing and communication performance which further aggravates with the increasing distance between transmitter and receiver as in the case of NTN. Therefore, to overcome the issue of latency, a spectrum efficient frame design is proposed that exploits the waiting period of a pulsed radar to perform interference free communication and sensing. The communication transmitter and radar transceiver embedded in high altitude platforms (HAPs) uses pulsed radar for sensing. Due to high altitudes, the target echo is reached at the HAPS after a long delay. This delay time is exploited to embed fixed and opportunistic communication in the proposed ISAC frame design. The numerical analysis explains spectrum efficiency of the proposed frame design compared to TDD mode of JRC systems, with reliable communication and accurate target detection.
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    A novel method for joint sensing and communication at terahertz frequencies by exploiting rough surfaces
    (Institute of Electrical and Electronics Engineers Inc., 2022) Rafique, Saira; Arslan, Hüseyin
    In this paper, a novel method for joint sensing and communication (JSAC) is proposed by exploiting the scattering properties of a rough surface present in the environment in the terahertz (THz) frequency range. At higher frequencies, the transmitted signals are more likely to be obstructed by a blockage owing to their shorter wavelength. Therefore establishing an alternate connection between the communicating nodes is highly desired. In case when the direct line-of-sight (LOS) link is unavailable between transmitter (Tx) and receiver (Rx), the proposed framework provides a true non-line-of-sight (NLOS) connection via a rough surface. The transmitted signal interacts with the rough surface present in the environment. The scattering pattern of the reflected signal from the rough surface is exploited to realize a JSAC system. Specifically, the high-powered specular component reflected by an intermediate rough surface is used for communication whereas, a moderate-powered diffused reflected component is exploited for target sensing. Finally, simulation results are provided to analyze communication and sensing performance along specular and diffused components reflected from a rough surface.
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    OTFS-FMCW waveform design for low complexity joint sensing and communication
    (Institute of Electrical and Electronics Engineers Inc., 2022) Zegrar, Salah Eddine; Rafique, Saira; Arslan, Hüseyin
    Joint sensing and communication (JSAC) systems are becoming attractive technologies since they can map the radio environment while performing communication using the same frequency bands. This is achieved by radar signal processing of the received signal that is composed of a known waveform. However, varying the waveform used for JSAC will create a trade-off between throughput and computational complexity. In this paper, we propose a joint orthogonal time-frequency space (OTFS)-frequency modulated continuous wave (FMCW) waveform design to perform JSAC to achieve high data rates due to OTFS and low-complex simple radar receiver thanks to FMCW. This is done by exploiting the simultaneous locality property of the FMCW in both time-frequency and delay-Doppler domains to orthogonally superimpose OTFS and FMCW, and use them for communication and sensing, respectively. Then, we provide an analysis of the computational complexity of the proposed design. The conducted simulation results demonstrate that the proposed waveform design can achieve accurate low-complexity radar parameters estimation while preserving high data rates.
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    Physical layer security for wireless sensing and joint radar and communications
    (Institution of Engineering and Technology, 2023) Rafique, Saira; Naeem, Ahmed; Arslan, Hüseyin
    [Abstract Not Available]
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    Radio environment monitoring
    (Wiley, 2021) Türkmen, Halise; Rafique, Saira; Arslan, Hüseyin
    The high number of wireless devices available and the inherent relationship between electromagnetic wave propagation and the physical environment have made these devices and their network architectures ideal sources of information for noncommunication-related applications, such as home monitoring and heart beat detection. The number and significance of wireless sensing use-cases highlight the importance of a framework to acquire information on the radio environment. This chapter introduces such a framework, goes over relevant technologies, and provides a case study for environment sensing. The most well-studied area of radio environment map (REM) is perhaps the radio frequency map construction. The chapter provides this as an example for the working of the REM architecture. The generalized radio environment monitoring framework enables information gathering and radio and physical environment awareness, behaving as an independent entity capable of feeding information to other entities.