Browsing Academic by Subject "Cognitive radio"
Now showing items 1-20 of 64
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A Deep Learning Model for LoRa Signals Classification Using Cyclostationay Features
( IEEE Computer Society , 2021 , Conference Paper)With the witnessed exponential growth of Internet of Things (IoT) nodes deployment following the emerging applications, multiple variants of technologies have been proposed to handle the IoT requirements. Among the proposed ... -
A sparsity-aware approach for NBI estimation and mitigation in large cognitive radio networks
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)Underlay cognitive networks should follow strict interference thresholds to operate in parallel with primary networks. This constraint limits their transmission power and eventually the coverage area. Therefore, in this ... -
Adaptive network coding for spectrum sharing systems
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, we propose an adaptive network coding scheme for cognitive relay networks comprising multiple secondary sources communicating with a common destination in the presence of multiple primary users. Conventional ... -
Area spectral efficiency of underlay cognitive radio transmission over rayleigh fading channels
( IEEE , 2013 , Conference Paper)Cognitive radio is a promising technology to improve the spectrum utilization by allowing the unlicensed (secondary) user share a frequency bandwidth with the licensed (primary) owner under the condition that no harmful ... -
Band allocation for cognitive radios with buffered primary and secondary users
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In this paper, we study band allocation of Ms buffered secondary users (SUs) to Mp orthogonal primary licensed bands, where each primary band is assigned to one primary user (PU). Each SU is assigned to one of the available ... -
Capacity analysis of cognitive wireless networks with dynamic spectrum access
( IEEE Computer Society , 2015 , Conference Paper)Cognitive radio (CR) is a promising technology based on spectrum sharing where the secondary unlicensed users can access the licensed frequency bands in the primary system without any modification to the devices, services ... -
Capacity enhancement in cognitive radio wireless network with dynamic spectrum access
( IEEE Computer Society , 2014 , Conference Paper)Deployment of femto-cells underlaying the macro-cell has been proven to greatly improve the system capacity and the indoor coverage. However, to successfully deploy this heterogeneous network, the interference among the ... -
Cognitive Radio Networks with Probabilistic Relaying: Stable Throughput and Delay Tradeoffs
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Article)This paper studies fundamental throughput and delay tradeoffs in cognitive radio systems with cooperative secondary users. We focus on randomized cooperative policies, whereby the secondary user (SU) serves either its own ... -
Cognitive relay-sharing by using hierarchical modulation under interference constraints
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)In this paper, we investigate relay-sharing in cognitive radio (CR) networks to improve the secondary user's (SU's) performance in the presence of interference. It is assumed that the relay is shared simultaneously between ... -
Cooperative access schemes for efficient SWIPT transmissions in cognitive radio networks
( IEEE , 2015 , Conference Paper)We investigate joint information and energy cooperative schemes in a slotted-time cognitive radio network with a primary transmitter-receiver pair and a set of secondary transmitter-receiver pairs. The primary transmitter ... -
Decentralized throughput maximization in cognitive radio wireless mesh networks
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Article)Scheduling and spectrum allocation are tasks affecting the performance of cognitive radio wireless networks, where heterogeneity in channel availability limits the performance and poses a great challenge on protocol design. ... -
Delay minimization through joint routing and resource allocation in cognitive radio-based mesh networks
( IEEE , 2012 , Conference Paper)We consider wireless mesh networks in which the nodes are utilizing cognitive radios and try to opportunistically gain access to spectrum resources. In such networks, the timely delivery of the traffic is a challenging ... -
Detecting the greedy spectrum occupancy threat in cognitive radio networks
( IEEE Computer Society , 2014 , Conference Paper)Recently, security of cognitive radio (CR) is becoming a severe issue. There is one kind of threat, which we call greedy spectrum occupancy threat (GSOT) in this paper, has long been ignored in previous work. In GSOT, a ... -
Detection of temporally correlated primary user signal with multiple antennas
( Springer Verlag , 2015 , Conference Paper)In this paper, we address the problem of multiple antenna spectrum sensing in cognitive radios (CRs) when the samples of the primary user (PU) signal as well as samples of noise are assumed to be temporally correlated. We ... -
Effective capacity of cognitive radio links: Accessing primary feedback erroneously
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)We study the performance of a cognitive system modeled by one secondary and one primary link and operating under statistical quality of service (QoS) delay constraints. We analyze the effective capacity (EC) to quantify ... -
Eigenvalue-Based Multiple Antenna Spectrum Sensing: Higher Order Moments
( Institute of Electrical and Electronics Engineers Inc. , 2017 , Article)The problem of multiple antenna spectrum sensing in cognitive radio (CR) networks is studied in this paper. We propose two new invariant constant false-alarm rate eigenvalue-based (EVB) detectors, using the higher order ... -
Energy-Aware Cooperative Wireless Networks with Multiple Cognitive Users
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Conference Paper)In this paper, we study and analyze cooperative cognitive radio networks with arbitrary number of secondary users (SUs). Each SU is considered a prospective relay for the primary user (PU) besides having its own data ... -
Energy-efficient cooperative cognitive relaying schemes for cognitive radio networks
( Elsevier B.V. , 2018 , Article)We investigate a cognitive radio network in which a primary user (PU) may cooperate with a cognitive radio user (i.e., a secondary user (SU)) for transmissions of its data packets. The PU is assumed to be a buffered node ... -
Energy-efficient cooperative relaying protocol for full-duplex cognitive radio users and delay-aware primary users
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)This paper considers a network in which a primary user (PU) may cooperate with a cognitive radio (CR) user for transmission of its data packets. The PU is assumed to be a buffered terminal operating in a time-slotted ... -
Forced spectrum access termination probability analysis under restricted channel handoff
(2012 , Conference Paper)Most existing works on cognitive radio networks assume that cognitive (or secondary) users are capable of switching/jumping to any available channel, regardless of the frequency gap between the target and the current ...