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In this paper, we propose a technique for cooperation and underlay mode selection in cognitive radio networks. Hybrid spectrum sharing is assumed where the secondary user (SU) can access the primary user (PU) channel in two modes, underlay mode or cooperative mode with admission control. Overlay spectrum sharing allows the SU to occupy the spectrum only when the PU is idle. Cooperation (collaboration)...
In this paper, an energy efficient, interference and route aware (EEIRA) protocol is proposed for underwater wireless sensor networks (UWSNs). The protocol combines the direct and relay forwarding mechanisms in transmitting the packets from source to destination. The relaying process involves selection of the best relay from a set of relay nodes. A relay node having the least distance from source...
In Underwater Wireless Sensor Networks (UWSNs), reliability is one of the major concerns for large number of applications. The underwater environment is very harsh and noisy. Fading is common and unavoidable, therefore achieving reliable data transfer requires innovative routing solutions. This paper presents a energy efficient cooperative routing with varying Depth threshold (Dth) called Depth and...
In order to reduce the outage probability of cooperative communication, a hybrid forwarding HARQ scheme in wireless network is proposed. In this scheme, if the relay decoding unsuccessfully until the last time, the Amplify-and-Forward protocol will be used to retransmit. Otherwise, the code cooperation will be used. Both of the Chase Combining and Incremental Redundancy combining is used in this scheme...
In this paper, we study the performance of a system with multiple decode-and-forward (DF) relays under the finite blocklength (FBL) regime. We derive the FBL-Throughput under both perfect CSI and average CSI scenarios while the corresponding throughputs under an infinite blocklength assumption (IBL-throughput) are discussed as performance references. Through numerical analysis, we evaluate the system...
Asymmetric data transmission is a challenge factor in wireless communication channel. In this paper, we study the issue of data processing in asymmetric data transmission from different sources in wireless communication channel, and propose a Joint Hierarchical Modulation and Network Coding (JHMNC) scheme. In the proposed scheme, the procedure of JHMNC is analyzed and compared with the traditional...
In this paper, we consider a time-division multiple-access relay channel (MARC), in which two source nodes (SNs) transmit data with different data rate to a destination node (DN) with the help of a relay node (RN). To provide asymmetric data rates, we consider joint hierarchical 16QAM (HM 16QAM) and network coding. Simulations results show that the joint HM 16QAM and network coding has similar throughput...
In this paper, we propose a multi-layer multicast routing protocol for multi-hop mobile ad hoc cognitive radio (CR) networks. The proposed protocol employs a probabilistic approach in performing the channel assignment and path selection process based on the concept of minimum spanning tree (MST). Our protocol accounts for the unique features of CR operating environment. Simulations experiments are...
We consider a two-hop underlay cognitive radio network (CRN) in which the secondary relay (SR) harvests energy from the secondary source (SS) before commencing two-hop transmission. During the energy harvesting phase, energy is transmitted in packets of small size followed by a silent intervals in which the relay provides a one-bit feedback. Without any need to pass channel estimates to a central...
Relaying is one of the promising approaches for extending service coverage and improving quality of service. The self-backhauling of relays towards a serving (donor) eNode B provides cost-effective solution for deployment scenarios where conventional backhauling is either costly or unavailable. The end-to-end throughputs achievable by users served by relays are dependent on achievable throughputs...
In this paper, we consider the impact of some factors at the relay node for the amplify-and-forward and decode-and-forward modes based on the energy harvesting in full-duplex relaying networks. Specially, the closed-form expression of their outage probability and throughput is illustrated. Moreover, we appraise the systems performance in terms of the outage probability and throughput which depend...
Opportunistic schedulers such as MaxRate and Proportional Fair are known for trading off between throughput and fairness of users in cellular networks. In this paper, we propose a novel solution that integrates opportunistic scheduling design principles and cooperative D2D communication capabilities in order to maximize fairness without sacrificing throughput. Specifically, we develop a mathematical...
Wireless Body Area Network (WBAN) has been considered as a revolutionary technology to address current healthcare needs. However, before the extensive deployment of WBAN, one main challenge to be met is how to balance the trade-off between data transmission rate and energy efficiency. In this paper, we utilize WBAN's spatial correlation characteristics during movement and propose an efficient cross-layer...
An incentive problem of ad hoc networks still remains for relaying frames from other nodes. By utilizing the Social Network System such as Twitter and Facebook, it is possible to estimate the degree of intimacy of friendship links not only to direct friends but also indirect friends such as friends-of-friends. If we provide links of ad-hoc network in relation to direct/indirect friends instead of...
This paper proposes a wired and wireless network cooperation (NeCo) system to quickly recover civilian telecommunication services in the aftermath of a catastrophic disaster. The proposed NeCo system achieves both rapid recovery and high throughput using wireless bypass routes backhauled by wired networks. With the NeCo system, active leaf nodes relay packets to and from dead leaf nodes whose wired...
Hybrid radio frequency (RF)/free space optical (FSO) systems are among the candidate enabling technologies for the next generation of wireless networks since they benefit from the advantages of both the FSO subsystem, e.g. high data rates, and the RF subsystem, e.g. high reliability in terms of link connectivity. In this paper, we focus on the problem of throughput maximization in the parallel hybrid...
Wireless sensor networks are a large number of sensor nodes that can be deployed to monitor un-attended environment. These sensor networks are responsible to sense, computation and transmission. In certain conditions sensor node cannot able to communicate with its neighbor nodes and may turn to ‘dumb node’. In such situations it can sense its environment but is unable to communicate. Due to this the...
The paper presents cooperative communication based wireless sensor network for monitoring Green house related parameters such as Temperature, humidity and Carbon-di-oxide. The system is demonstrated by using network simulator NS2 with increased network capacity to suit large geo graphical areas. The comparison results show that cooperative transmission provides better performance than non-cooperative...
In this paper, we study a wireless-powered cooperative relaying system which consists of a source node (SN), a relay node (RN) and a destination node (DN). The RN has no embedded power supply, thus it needs to harvest energy from the radio signal transmitted by a power beacon (PB) which is responsible for charging the RN before forwarding the information to the DN. In addition, we assume that the...
To increase the throughput and performance of the next-generation wireless cellular network, this paper proposes two clustering algorithms for integrated cellular and ad hoc relaying systems. In this system, we consider that all the available users are divided into two groups: One is the super group which locates in the cell central region, and another is the regular group which locates in the cell...
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