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This paper presents a multichannel assignment problem in a centralized cognitive radio sensor network (CRSN). The basic aim of this problem is to maximize the overall system throughput and minimize the overall energy consumption of the CRSN. First, a weighted sum based optimization problem is formulated. Then the problem is represented using bipartite graph and solved using matching based hungarian...
In this paper, we consider a multi-level power allocation scheme for cognitive users in the cognitive radio networks. The proposed system uses a new frame structure to improve overall throughput of the cognitive radio systems. We propose a strategy in which, the licensed user can transmit with multiple levels of power which seems to be more realistic and practical. In this work, the proposed strategy...
We present a novel out-of-band spectrum sensing and channel allocation scheme for frequency hopping based cognitive radio networks using genetic algorithm. Based on the optimized solution derived from GA, a set of nodes for sensing the next hopping channel and a set of nodes for transmitting data on current channel are derived. The channel allocation is performed according to individual traffic demand...
For cognitive radio, dynamic spectrum access is a promising development direction. Dynamic spectrum access mechanism which is considered in this paper is a kind of channel reservation mechanism. Unlike most of the existing channel reservation mechanism, it is considered that the channel is reserved exclusively for unauthorized users in this paper. This reserved channel can only allow unauthorized...
Spectrum prediction, as one enabling technique for dynamic spectrum access (DSA), has recently been received ever-increasing research attention. Most related studies (explicitly or implicitly) assume that spectrum prediction is useful for DSA. However, it does't fundamentally clear when spectrum prediction is really beneficial. To address this issue, this paper firstly provides a high-level review...
Green cognitive radio has attracted significant research attention as an effective means of alleviating spectrum scarcity and energy-saving problem in wireless communications. In this paper, we focus on the power allocation for maximizing the transmission throughput and energy efficiency (EE) of secondary users (SUs). More specifically, we propose a multi-band power allocation scheme, where multiple...
For the energy-constrained cognitive networks, it is particularly important to improve their energy efficiency (EE). We focus on the EE optimization of the continuous spectrum sensing (CSS). The EE of the secondary user (SU) networks is derived. To maximize the EE, an optimization problem is formulated under the constraints of sensing performance. After some theoretical analyses, the detailed processes...
In the cognitive radio networks (CRNs), efficient spectrum sensing is a key enabling techniques for the effective spectrum exploration. However, Majority of the existing works on spectrum sensing is conducted the spectrum sensing serially in cognitive radio networks, which may bring about the sensing delay problem. In this paper, in order to make full use of the available channel resources and improve...
Dynamic spectrum access technology is a kind of technology that provides a solution to the spectrum scarce problem. The most important issue in the CR network (both primary users and secondary users coexists in the network) is that the traffic of secondary users should not affect the primary users communication. In order to not affect the primary users, we have to detect the existence of the primary...
Cognitive radio (CR) network technology is widely used as a approach to the solve the scarce radio spectrum by allowing the unlicensed users to access the licensed spectrum. Since in the CR network, the licensed users are easily be affected by the introduce of the unlicensed user, we have to avoid to bring the interference to the licensed users when the unlicensed users try to transmit the data on...
Despite of high throughput and low fabrication cost of vertically partially connected 3D NoCs, thermal difficulties arise from poor heat dissipation and inappropriate traffic distribution of these kinds of 3D NoCs. This paper proposes an adaptive routing algorithm in order to manage thermal challenges in partially connected 3D NoCs. In the proposed routing algorithm, vertical links declare their availability/unavailability...
The increase of wireless devices due to the implementation of wireless sensor networks, cyber-physical systems with wireless communication interfaces and mobile monitoring as well as the installation of diagnosis applications into the shop floor improves real-time transparency of machine conditions and production processes. For a minimal invasive integration of such technologies into the brownfield...
A new cooperative spectrum sensing method for non-time-slotted full duplex cognitive radio networks (FD-CRNs) is proposed in this paper, with the self-interference channel considered as Nakagami-m fading channel, which is more practical compared with commonly used Rayleigh and Rice channel. Closed-form expressions of the probabilities of false alarm and detection are provided in this paper for non-time-slotted...
Knowledge of interacting channels is essential for characterizing the performance of a cognitive radio system in terms of interference power received by a primary receiver and throughput at a secondary receiver. Baseline models considered for the performance characterization assume perfect knowledge of the interacting channels. Recently, an analytical framework has been proposed that incorporates...
The rapid growth of modern wireless applications results in spectrum and energy scarcity. Cognitive radio (CR) technology is pivotal to resolve spectrum shortage. However, energy consumption is a critical issue in CR networks (CRNs) due to the unique functionality of spectrum sensing. Besides RF energy harvesting has come up as a potential solution to provide energy to CR devices. In this paper, we...
The Controller Area Network (CAN) is a shared medium, priority-based communication protocol, widely used in the automotive industry for interconnecting electrical components. Although allowing messages to take priority over others in accessing the shared medium is naturally desirable for vehicular applications, it also provides a vulnerability for Denial-of-Service (DoS) attacks. This paper studies...
Among several potential applications of Full- Duplex (FD) technology, FD Cognitive Radio (CR) communication is one important area where FD can provide several advantages and possibilities such as concurrent sensing and transmission, improved sensing efficiency and the secondary throughput. However, the main challenge is to mitigate the harmful effects of the residual Self-Interference (SI) which depends...
The periodic sensing requirements in cognitive radios cause interruptions for secondary user (SU) communication. As a result, the throughput of the secondary system during sensing can be very low. In this paper, we propose a monitoring scheme for Orthogonal Frequency Division Multiplexing (OFDM) based cognitive radio which can monitor the spectrum during ongoing communication and detect the emergence...
We suggest a cooperative spectrum sensing scheme for wideband cognitive radio network when primary user emulation attack (PUEA) is present. PUEA is known to be one of the practical challenges in deploying cognitive networks, where some malicious users try to emulate the primary signal and seduce unlicensed users to not let them access the unoccupied frequency. In this paper, the detection of primary...
We consider a cognitive radio network of nodes with full duplex capability where Self-Interference Suppression (SIS) is not perfect. We have proposed a new scheme for sensing and transmission of Secondary Users (SUs) with two modes of operation; Cooperative Sensing (CS) mode and Full Duplex Transmit and Receive (FDTR) mode. Cooperative sensing is applied to reduce misdetection probability and to avoid...
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