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Underwater acoustic grid network is promising for providing high data rate and wide coverage service. For the scheduled time division multiple access (TDMA) protocols in the underwater acoustic grid networks, scheduling is an essential part to achieve reliable and energy efficient performance. Scheduling not only completely guarantees the interference free transmission in the network, but also makes...
One of the challenges in designing dual communication and radar systems employing multi-carrier waveforms is addressing the separate radar and communication objectives. This challenge becomes more difficult when one considers that such a system would be the target of malicious attacks, especially those involving interference. In this paper, to gain insight into the problem, a game-theoretical model...
Interference alignment (IA) is a prospective method to manage interference between users in multi-user networks. On the other hand, jamming can be an effective way to combat adversarial eavesdropping for legitimate networks. In this paper, a beneficial jamming scheme is proposed for interference alignment networks. In the scheme, the jammer utilizes its precoding vector to constrain the jamming signal...
We outline guiding principles for choosing the subband bandwidth of a multicarrier system with multiple antennas. Initially, we review considerations for the choice of bandwidth in fast-fading doubly dispersive channels. We append to these considerations those relevant to the use of multiple antennas for intereference rejection in the wideband regime. To weigh the benefits of narrow subbands, which...
In order to counteract hostile communication based on the advanced Orthogonal Frequency Division Multiplexing (OFDM) technology, an efficient and unrecognizable jamming technique by failing the OFDM cyclic prefix (CP) functionality is developed in the paper. CP is introduced into OFDM systems to prevent interference caused by the multipath fading, as long as it is no shorter than the channel delay...
The heterogeneous network concept in many respects meets customer requirements and maintains high energy efficiency. In this paper, we mainly investigate the impact of deployment efficiency of heterogeneous small cells BSs compared to the advantages of increasing the performance of wireless networks as a whole. We used well-known analytical models for calculating the values that can be obtained for...
Considering a small-scale fading environment in a dense random wireless network, we investigate the impact of the carrier-sensing threshold on the link performance under the premise of a fixed carrier-sensing range. At first, we assume a close transmitter-receiver distance and model the network nodes as a homogeneous Poisson point process (PPP). Then we present a simple analysis model of the conditional...
Device-to-device (D2D) communication has been proposed as a solution for vehicle-to-vehicle (V2V) communication, which has strict requirements on reliability and latency. Previous works on V2V communication typically assume single-antenna users, which ignore the potential of multiple antennas. By contrast, this paper studies an uplink power control problem in multi-antenna V2V underlay cellular networks...
Machine Type Communication (MTC) is a key component of future 5G networks, and its realization is now possible due to the advances in technology and the market drivers. Several challenges however exist which hinder the realization of MTC, among which signaling overhead is considered the prominent challenge, particularly due to the massive number of devices in MTC networks. In this work, we consider...
Smart grid (SG) has been recognized as a promising solution to manage and distribute electricity in the next generation power systems. The large number of devices in power systems make the wired communication a non feasible solution, thus wireless transmission becomes necessary. However this demands a huge portion of radio spectrum. In this work, we aim to provide the secure and reliable SG communication...
mm-Wave is a promising technology to meet the enormous bandwidth demands of the future generation cellular networks. This technology has vast amount of unused bandwidth, but has problem of human blockage. Blockage mitigation methods for indoor environments cannot be applied to outdoor scenarios effectively. In this paper, we mitigate human blockage of the mm-Wave technology by proposing an algorithm...
In this paper, we investigate multiple-input single-output (MISO) simultaneous wireless information and power transfer (SWIPT) broadcast channels with confidential messages (BCC) scenario, in which a multiple-antenna transmitter simultaneously transmits confidential messages and power to multiple single-antenna receivers. Considering the imperfect channel state information (CSI), we study the joint...
In this paper, we investigate the impact of the carrier-sensing range on the link performance in a dense wireless network. Considering small-scale fading effects, we fix the carrier-sensing threshold and adaptively adjust the carrier-sensing range. At first, we assume a close transmitter-receiver distance and model the network nodes as a homogeneous Poisson point process (PPP). Then we obtain the...
In this paper, a transmission mode selection scheme is proposed for device-to-device (D2D) communications underlay cellular networks, where potential D2D (p-D2D) users reuse the spectrum of uplink cellular users (CUEs). The developed framework is used to analyze and understand how the underlay D2D communication affects the cellular network performance. Unlike most of the previous researchers who only...
The Device-to-Device (D2D) communication underlaying cellular networks has advantages of improving the spectral utilization, data rate, and energy efficiency. This paper studies a position-based mode selection and resource allocation scheme for D2D communications underlaying cellular networks. With position information available, first an offline channel state information (CSI) retrieval model is...
Radio-on-demand wireless sensor networks (WSN) are expected to be expanded the lifetime of sensor nodes because the receiver effectively utilizes the sleep/wake-up control function. The multi-carrier code division multiple access (MC-CDMA) using modified pseudo orthogonal M-sequence sets (MPOMS) codes have been proposed for radio-on-demand WSN systems. In this paper, the rigorous communication success...
In this paper, a novel Memory-Assisted Adaptive-Threshold detection (MAAT) scheme for diffusion-based molecular communications (MC) systems is proposed. The proposed scheme applies to MC systems in which single-type of molecules is assumed to carry the information from the transmitting nano-machine, through a fluid medium, to the receiving nano-machine. The information is represented by the received...
This paper tackles the study of the nondesired effects in the detection capabilities and system resolution of Passive Radar (PR) solutions due to sporadic interference. Real radar data acquired by IDEPAR demonstrator (DVB-T based PR system developed by the University of Alcala) with the presence of an interference were considered. The ambiguity function is calculated to estimate the pedestal mean...
To date, remote metering devices (electricity, gas, water and heat) operating in the 800 MHz band (862–869 MHz) are used either by IoT providers or by metering service providers to determine the energy etc. consumption in private houses from the outside without the need to enter the building. Meters can be integrating as simple LoRaWAN device transmitters connected to a central database by base stations...
Device to Device(D2D) communication has been enumerated as one of the enabling technologies for future wireless communication. D2D communication exploits devices proximity to allow direct communication between the devices and in situations where the channels between the devices do not allow direct communication, relays can be introduced. In analysing/addressing the problem of relay selection in D2D...
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