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In this paper, big Radio Frequency (RF) data assisted optimization is considered for future wireless networks employing cognitive radio technology with machine learning capability. A cognitive radio network (CRN) with multiple Secondary Users (SUs) may coexist with other wireless systems such as Small Cells (SC) and Radar systems, both Primary Users (PUs) with different level of priorities. Traditional...
Visible Light Communication (VLC) using Light Emitting Diodes (LEDs) within the existing lighting infrastructure would reduce the implementation cost and may operate at higher throughput than RF or Infrared (IR) based wireless systems. One of the major concerns in VLC implementation is developing resource allocation schemes that maintain or increase channel throughput, ensure fairness and fast link...
In this work, we consider Quality of Service (QoS) guarantee for Device to Device (D2D) users co-existing with a cellular system where the D2D communication links are sharing radio spectrum resources with macrocell users in the downlink. Despite the lofty advantages associated with D2D communications, one major concern is the resulting interference from the D2D users, which should not infringe on...
In this paper, we consider two uncoordinated and geographically overlapping Cognitive Radio (CR) networks coexisting together with Primary User (PU) networks. One of the CR networks, the Cognitive Gateway Network (CGN) has higher priority to access the spectrum than the other CR network. We study the achievable rates of both CR networks. The achievable data rate per-node is derived analytically considering...
The challenge of mitigating the Uplink (UL) interference in a two-tier heterogeneous network could be significantly improved by employing Physical-Layer Network coding (PNC) at a Home NodeB (HNB). This paper makes a case for a macrocell femtocell overlay network that utilizes PNC to mitigate the UL interference at the HNB. In closed subscriber group (CSG) UL information exchange, a Macrocell User...
The aim of this paper is to study the achievable throughput of an ad hoc Device-to-Device (D2D) communications with cognitive radio capabilities coexisting with cellular user equipment (UE) in the same macrocell. Specifically, we consider ad hoc D2D systems with non-orthogonal resources sharing instead of D2D with infrastructure support. The main objective is to find out how much throughput a device...
In this paper, we examine performance management for cognitive radio (CR) ad hoc networks, and address the problem of data link congestion for secondary users. Our approach is to propose a metric based on the probability of contended link access and the probability of packet error to identify potential congestion on those links. We consider this metric in the context of a dynamic spectrum environment...
In this paper we study energy detection for primary user signals in the case of distributed Cognitive Radio (CR) networks. We concentrate on the effects of interference caused by other CR users due to timing misalignments and propose a novel mathematical model for calculating the effects of interfering nodes on energy detection and derive closed-form solutions for the probabilities of detection and...
In this paper, interference mitigation through downlink power control is considered for macrocell Femtocell overlay. Specifically, the strong interference in the downlink from the home base station to a nearby macrocell user should be properly controlled such that the quality-of-service of both the macrocell user and the Femtocell users can be guaranteed. In this work, the fundamental capacity limitation...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
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