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In this paper, we propose a novel resource allocation (RA) scheme based on interference minimization (IM) for cognitive radio networks (CRN). In the approach, we focus on an efficient scheme of subchannels assignment, power allocation and access control for the orthogonal frequency division multiple access (OFDMA)-based secondary users (SUs), accessing licensed spectrums of primary users (PUs) with...
In a spectrum-sharing underlay environment, we carry out a comprehensive outage probability analysis for a secondary (unlicensed) system operating with a limited feedback from the primary (licensed) system. We focus on single-user single- input multiple-output (SIMO) secondary communications where the direct link is being assisted by a set of single-antenna decode-and- forward (DF) relay nodes acting...
In this paper, the resource allocation problem is considered in the context of spectrum underlay in cognitive radio (CR) networks. In such a framework, the quality of service (QoS) requirements for both primary users (PUs) and secondary users (SUs) need to be satisfied. Admission control based on removal algorithms is used jointly with power control such that the QoS requirements of all admitted SUs...
We propose a robust coordinated game theoretic approach that distributively minimizes the aggregate downlink transmit power in a multicell interference network in the presence of imperfect channel state information (CSI). The optimization is constrained to satisfying the signal-to-interference-plus-noise-ratio (SINR) requirements at individual user terminals within certain predefined SINR outage probabilities...
This paper proposes a selective AF-OFDM (Amplify-and-Forward, Orthogonal Frequency Division Multiplexing) relaying protocol, in which selective relaying policy is adequately utilized to improve the spectrum efficiency of cooperative multi-carrier transmission, and addresses the power minimization problem subject to a target quality of service (QoS) constraint for corresponding battery-operated systems...
This paper tackles the capacity optimization problem for Device-to-Device (D2D) coexisting with long term evolution (LTE) cellular system. We firstly derive and analyse the probability density functions of the Signal-to-Interference Ratio (SIR). We show that the capacities of both D2D and LTE are concave and convex respectively w.r.t the transmitted power ratio. To maximize the capacity sum of both...
In this paper, statistical Quality of Service provisioning in next generation heterogeneous mobile cellular networks is investigated. To this aim, any active entity of the cellular network is regarded as a queuing system, whose statistical QoS requirements depend on the specific application. In this context, by quantifying the performance in terms of effective capacity, we introduce a lower bound...
Underlaying device-to-device (D2D) communications to a cellular network is considered as a key technique to improve spectral efficiency in 5G networks. For such D2D systems, mode selection and resource allocation have been widely utilized for managing interference. However, previous works allowed at most one D2D link to access the same channel, while mode selection and resource allocation are typically...
In this paper, a performance analysis for cognitive radio networks (CRNs) under the outage probability constraint of the primary user and peak transmit power constraint of the secondary user is conducted. Given an automatic repeat request protocol, analytical expressions for the packet delay and throughput of the CRN are derived. Most importantly, these expressions can be used to understand the quality...
In this paper, power allocation over time-varying multiple-access interference channels is studied. Particularly, a stochastic network sum-rate maximizing power allocation problem is formulated, capturing the random nature of communication channels. Typically, a centralized controller must have perfect knowledge of global instantaneous channel state information (CSI) for dynamic optimal power allocation;...
The Tactile Internet will be able to transport touch and actuation in real-time. The primary application running over the Tactile Internet will be haptic communications. Design efforts for both the Tactile Internet and the haptic communications are at a nascent stage. It is expected that the next generation (5G) wireless networks will play a key role in realizing the Tactile Internet. On the other...
Introducing relay node to Device-to-Device (D2D) technology can extend the cell coverage range and improve the system performance, and the relay selection is a key point of relay-assisted D2D communication. In this paper, the relay selection problem is discussed for D2D communication underlaying cellular network. We propose a two-stages relay selection and resource allocation joint method for relay-assisted...
The outage performance of dual-hop multi-relay decode-and-forward (DF) system for asymmetric fading channels is analyzed with the help of outage probability (Poutage). The channels between the source and relays are assumed to be generalized (k-μ) fading channels whereas channels between the relays and destination are generalized (η-μ) fading channels. Formulation of outage probability expression is...
Device-to-Device (D2D) multicast communication is emerging as a practical solution to alleviate severe capacity crunch in data-centric wireless networks and to encourage backhaul-free communication directly among devices with similar content requirement. Resource allocation in multicast networks is a critical issue that impacts both, the network throughput and spectrum efficiency. We devise an uplink...
This paper considers the optimal energy efficient association for HetNets by applying almost blank subframes (ABSs) techniques. Aiming at maximizing energy efficiency (EE) without the quality of service (QoS) constraints, we obtain a closed-form optimal solution, which indicates that the optimal choice of blank resource block (RB) fraction for EE maximization is binary without individual user QoS...
Cloud Radio Access Networks (Cloud-RAN) promise to leverage cloud computing capabilities to enhance the quality and coverage of wireless networks. A dense network of remote radio heads (RRHs) ensures less attenuation at the receiver side. However, two drawbacks are associated with such dense network: the first is the high energy consumption associated with such a large number of RRHs; the second is...
Device-to-Device (D2D) communications underlaying cellular networks can improve the network capacity and spectrum efficiency by sharing the cellular resources in the direct-transmission mode. However, the stringent interference between D2D and cellular systems can seriously repress the overall performance improvement. In this paper, we aim to solve this dilemma by applying the concept of differentiated...
We consider the main costs and gains for the management of a Long Term Evolution (LTE) cellular network exploiting e-NodeB (eNB) Sleep Mode (SM). More in depth, we develop an algorithm, called EURA, that is able to target a sustainability metric. The sustainability of the system takes into account the costs of energy consumed by active eNBs, the costs for repairing an eNB when it fails (as a consequence...
In this paper, we demonstrate the optimal power allocation for QPSK, 16-QAM, and 64-QAM modulation schedules and the role of channel quality indicator (CQI). We used sigmoidal-like utility functions to represent the probability of successful reception of packets at user equipment (UE). CQI as a feedback to the base station (BS) indicates the data rate that a downlink channel can support. With Levenberg-Marquardt...
This paper proposes an integrated cellular phone system with a cognitive radio sensor node (CRSN) to combat terrorism without establishing separate sensor network architecture for explosive trace detection. In this approach cellular phone user is considered as primary user (PU) with the permission to utilize the license band and CRSN may be designed in underlay mode to operate in the emergency situation...
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