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In this paper, we study a multi-level power allocation scheme for SUs in cognitive radio systems that uses a new frame structure to improve overall throughput of the system. The scheme is different from the conventional strategies in that the PU can now transmit with multiple levels of power rather than a constant level of power, which seems to be more realistic and practical. Our proposed strategy...
In this paper we characterize the radio frequency (RF) spectrum opportunities available in a common GSM (Global System for Mobile Communications) channel to support the operation of a cognitive radio network (CRN). In a first step, we describe the technical details involved to sample the channel using a Software Defined Radio (SDR) device. Adopting a simple Energy-based detector, we identify the two...
In this paper, we propose a novel network model for RF-powered cognitive radio networks and ambient backscatter communications. In the network under consideration, each secondary transmitter is able to backscatter primary signals to the gateway for data transfer or to harvest energy from the primary signals and then use that energy to transmit data to the gateway. To maximize overall network throughput...
We investigate the global throughput maximization of distributed spectrum reusing (DSR) in cognitive radio (CR) network, which reaches the two-dimensional spectrum multiplexing. Most previous works only consider the temporal-domain accessing, which greatly underutilize the spectrum resources. In this paper, we propose a new temporal-spatial spectrum reusing scheme by fully exploiting the location...
State-of-the-art sensing methods mostly exploit spectrum holes (SHs) in conventional frequency, time, and geography dimensions, which can hardly satisfy the increasing throughput demand of CR networks. Meanwhile, the rapid development of multi-antenna technology makes the terminal obtain the angle recognition capability. Motivated by this, this paper analyzes SHs from the angle/space domain and design...
This paper studies the application of non-orthogonal multiple access (NOMA) to a cooperative multicast system (termed CM-NOMA). In particular, the multicast subscribers are served as secondary users underlaying a primary user. To enhance the secondary user fairness and compensate for the primary user, a two-stage cooperative strategy is proposed by selecting a certain secondary user to perform NOMA...
In a cognitive radio network (CRN), a premise for two nodes to communicate is having a rendezvous which means that they switch to the same channel simultaneously. Most existing channel hopping solutions for the rendezvous problem is for a homogeneous CRN where nodes have the same type of cognitive radio and thus can sense the same spectrum. In reality, nodes have different types of cognitive radios...
Human and animal societies exhibit complex cognitive and social processes of coordination, cooperation, and competition among their members. Among other functions, these processes can facilitate fairer sharing of resources among community members and enhance individual survival outcomes. In this work, three bio-socially inspired models for secondary users of spectrum in cognitive radio networks are...
Cognitive radio (CR) sense the spectrum to discover the available white spaces in it for making better utilization of spectrum and alleviates the spectrum shortage problem. While using the available spectrum, it avoids the harmful interference with licensed users or primary users (PUs). Individual spectrum sensing by CR may not be accurate due to fading and shadowing effects. Cooperative spectrum...
Compared with conventional cognitive radio networks (CRNs), the efficiency can be improved if secondary users (SUs) have full duplex (FD) communication capabilities. We discuss FD spectrum sensing in non-time-slotted CRNs and study two work modes of SUs, transmitting-sensing (TS) mode and transmitting-receiving (TR) mode. SUs work alternately in two modes. In such a context, we analyze the sensing...
This paper describes the design, experimental assessmant and Software Defined Radio (SDR) implementation of a Secondary User (SU) link for the IEEE DySPAN Challenge 2017. The objective is to successfully discern the behavior of and coexist with a Primary User (PU), whose channel access patterns vary over time. For that end, we utilize sensing, deep learning and dynamic optimization.
The problem of cooperative spectrum leasing among multiple primary users (PUs) and secondary users (SUs) is considered. A hybrid Stackelberg-coalition formation game theoretic algorithm is proposed that enables the PUs to identify a group of cooperative SUs by looking at the reputation history of their cooperative behavior. The coalition formation approach also promotes collaboration among the SUs...
With rapid development in wireless applications, there arises a demand for available spectrum. Cognitive radio technology is a promising solution to enhance the spectrum utilization by enabling unlicensed users to exploit the spectrum in an opportunistic manner. Since unlicensed users are temporary visitors to the licensed spectrum, they are required to vacate the spectrum when a licensed user reclaims...
An experimental evaluation of an LTE Cognitive Radio (CR) Network, implemented using highly integrated Software Defined Radio (SDR) platform is presented. Each transceiver can be configured as a primary (resp. secondary) eNodeB or a primary (resp. secondary) user in this framework. We propose simple distributed algorithms which the secondary eNodeB can employ to efficiently manage the spectral opportunities...
Cognitive Radio (CR) technology offers a promising solution to the spectrum scarcity problem via Dynamic Spectrum Allocation (DSA). Due to the nature of Cognitive Radio Networks (CRNs), where two networks are active simultaneously, a significant amount of control messaging is required in order to coordinate channel access, schedule sensing, and establish release connections. Efficient Control Plane...
This paper studies the problem of cooperative communications in cognitive radio networks where the secondary user is equipped with finite length relaying queue as well as finite length battery queue. The major hurdle towards fully characterizing the stable throughput region stems from the sheer complexity associated with solving the two-dimensional Markov Chain (MC) model for both finite queues. Motivated...
Systems comprised of Cognitive Radio Networks (CRN) have been gaining attention in the current literature, given their ability to reduce spectrum scarcity by reusing parts of the spectrum band, while at the same time ensuring a minimum Quality of Service (QoS) margin. In this regard, it becomes important to consider the CRN's usage of multiple access protocols. In this paper, we consider a CRN with...
As the wireless networks has the capability toharvest RF signal's energy and therefore can be referred as selfsustained networks. Wireless networks can act as self-sustaining byharvesting the energy from RF signals (radio frequency). In recenttime, researchers have developed efficient circuitries &components for harvesting the RF energy for low powered wirelesselements. By its support, and based...
The aim of this manuscript is to propose a secure handoff scheme for cognitive radio network by ensuring a secure communication among cognitive users (CU). A coordinator cognitive user(CCU) is selected based on users trust values/factor (TV/TF) by periodically computing and updating these values of each CU depending upon their characteristics. The CCU is the controlling unit to allow the unused band/channel...
Deployment of Multiple Cognitive Radio Networks (CRNs) is a very common scenario in today's world, like in the field of defence or disaster management. In this paper, we deal with the case of multiple numbers of co-located CRNs acting as secondary network along with one primary user (PU). We study the node based throughput performance of a CRN in presence of several coexisting CRNs. We generalize...
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