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This paper analyzes and evaluates joint effect of primary interference and artificial noise on information securing capability of cognitive radio networks (CRNs) under interference power constraint, peak transmit power constraint, and Rayleigh fading. An exact formula for an important security performance metric, secrecy outage probability, is first derived and then validated by computer simulations...
This research shows the interference occurrence in Single-Frequency Networks for Digital Television broadcasting which influence on the quality of receiving in the overlapping service zones of transmitters. The article contains qualitative and quantitative evaluation of the compensation effectiveness of the interference distortion in the receiver's demodulator. The results were obtained using CADs...
Device-to-Device (D2D) communications are promising technologies to improve the spectrum efficiency, network throughput, and transmission latency for short-range communications in underlaid cellular networks. In this paper, we investigate the resource allocation for multiple D2D pairs in underlaid cellular networks. By utilizing the Power Emission Density-based interference modeling method, the impact...
In this paper, we investigate the secrecy performance of an underlay cognitive decode-and- forward relay network (CDRN) by exploiting an active direct link in the presence of primary user's (PU's) interference. Herein, a secondary user (SU) transmitter strives to maintain a secure communication link with a legitimate SU receiver in presence of a passive eavesdropper. On account of system's viability,...
The mutual interference induced by the hybrid links can bring the secrecy gain for device-to-device (D2D) communication underlaying cellular networks, where there have been few works on studying its impact on the secrecy performance of the accessed D2D pairs. In this paper, our aim is to mainly analyze the secrecy performance gain of the accessed D2D pair brought by the mutual interference.Firstly,an...
This paper focuses on cognitive radio (CR) internet- of-things (IoT) networks where spectrum sensors are deployed for IoT CR devices, which do not have enough hardware capability to identify an unoccupied spectrum by themselves. In this sensor- enabled IoT CR network, the CR devices and the sensors are separated. It induces that spectrum occupancies at locations of CR devices and sensors could be...
In this paper, we study the cache-aided cloud radio access network (C-RAN) with wireless fronthaul, where multiple cache-enabled users are served by multiple cache-enabled transmitters that are connected to a cloud processor through a wireless fronthaul link. We put forth a caching-and-delivery scheme that combines network-coded fronthaul transmission with cache-aided interference management. By broadcasting...
Compared with today’s 4G wireless communication network, the next generation of wireless system should be able to provide a wider range of services with different QoS requirements. One emerging new service is to exploit cooperative driving to actively avoid accidents and improve traffic efficiency. A key challenge for cooperative driving is on vehicle-to-vehicle (V2V) communication which requires...
An undesirable side-effect of network densification is a reduced quality of service due to increased contention. One interesting solution to address this issue is full-duplex medium access control (MAC) with collision detection. By detecting collisions early on, a considerable amount of energy can be saved in dense networks. However, when traffic demand and, as a result, the collision rate decrease,...
Wireless devices are ubiquitous nowadays and, since most of them use the same unlicensed frequency bands, the high number of packet losses due to interference and collisions degrade performance. Reliability, energy consumption, and latency are key challenges for future dense networks. Allowing the transmitter to take action, i.e., vacating the channel, as soon as a collision or interference is detected...
This paper presents a method for designing linear-phase square-root (SR) FIR digital filters that alleviate the effect of receiver timing uncertainty by the quadratically constrained quadratic programming. As in the previous work, we take the “roughness” of the hybrid analog/FIR-SR filter impulse response as the cost function and the filter's stopband attenuation and the system's tolerable ISI as...
In this paper, the performance of an underlay multiple-input multiple-output (MIMO) cognitive radio system is analytically studied. In particular, the multiple antennas of the secondary transmitter operate in a spatial multiplexing transmission mode, while a zero-forcing (ZF) detector is employed at the secondary receiver. Additionally, the secondary system is interfered by multiple randomly distributed...
In this paper, we develop and analyze a novel performance metric, called interference efficiency (IE), that shows the number of transmitted bits per unit of interference energy imposed on the primary users (PUs) in an underlay cognitive radio network (CRN). Specifically, we develop a framework to maximize the IE of a CRN with multiple secondary users (SUs) while satisfying target constraints on the...
In this work, we study the effect of energy harvesting in a cognitive shared access network with delay constraints on the primary user. We model the distribution of secondary nodes by a homogeneous Poisson point process (PPP), while the primary user is located at fixed location. The secondary users are assumed to have always packets to transmit whilst the primary transmitter has bursty traffic. We...
With the rapid development of International Mobile Telecommunications (IMT), the demands of required bandwidths is increasing. In order to avoid the interference between different systems and to make full use of frequency spectrum resources, an enhancing requirement of channel measurement accuracy is attracting more and more people's attention. Building Penetration Loss (BPL) makes a great contribution...
In this paper, an underlay based cognitive radio network (CRN) consisting of a secondary base station (SBS), a secondary receiver (SR), an energy harvesting node (EHN), and a primary transmitter-receiver (PT-PR) pair, is considered. The EHN is assumed to have a power splitter (PS) at the receiver to decode information and harvest energy simultaneously from the SBS transmission, thus reducing the secrecy...
Dynamic spectrum sharing paradigm is envisaged to meet the growing demand for the Radio Frequency (RF) spectrum. There exist several technical, regulatory, and business impediments for adopting the new paradigm. To address these challenges, we need the ability to characterize and quantify the use of spectrum. In this paper, we propose MUSE, a methodology to characterize and quantify the use of spectrum...
We consider a cognitive radio scenario in which two networks share a licensed spectrum. Primary network is the legitimate network while cognitive radio network utilizes the underutilized frequency sub bands. For this scenario our focus is primarily on controlling the interference to the legitimate user and in addition, to minimize the interference between the secondary users while assuring quality...
Energy-efficient green communication techniques are of special importance for cognitive radio networks (CRNs) in order to reduce carbon dioxide gas emission. This paper proposes an efficient algorithm for power control with QoS guarantee in the underlay green CRNs. The proposed algorithm allows us to underlay resource sharing where both primary users (PUs) and secondary users (SUs) coexist on the...
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