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In the wireless world, the devices face a unique challenge of energy scarcity. Unlike the wired systems, there is no continuous wired energy resource available to power the ongoing wireless communication. Instead, the entire system runs on wireless batteries. Taking a step further in this field, the concept of energy harvesting is introduced a while ago. This paper combines the concept of harvesting...
Congestion occurs in the multi-hop wireless relay routers as the packet arrival rate outpaces traffic handling capacity. Congestion introduces packet loss, queuing delay and restraint formation of new connections in the networks. An intelligent queue management needed in the wireless relay routers that effectively regulate the queue accumulation and avoid network congestion. In this paper, an experimental...
Previous studies have shown that opportunistic routing (OR) can significantly improve the performance of wireless multi-hop networks, such as wireless adhoc networks and wireless sensor networks. However, most existing opportunistic routing schemes only consider node location as the priority metric in relay selection, where packets may accumulate in relays' packet buffer, especially in data intensive...
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...
In this work, we propose a cluster-based multihop relaying with partial relay selection (PRS) scheme for an energy harvesting (EH) relaying network. We analyze the performance in the framework of the decode-and-forward (DF) relaying with adaptive power splitting (APS) protocol over symmetric and asymmetric fading channel models. Through extensive numerical analysis, we show that the proposed scheme...
In this paper, the performance of radio frequency energy harvesting system with multiple power-constrained relays over Rician/Rayleigh fading channels is studied. This considered system consists of one power and information source, multiple power-constrained relays and one destination. In order to exploit the diversity advantage of cooperative network with low computational complexity, the relays...
In order to accommodate the growing traffic demands from moving users, the next generation heterogeneous networks (HetNets) are considering the deployment of moving small cells (mSCs). mSC is a user-centric network and unlike other fixed small cells such as femto and pico cells, these mSCs use wireless backhaul links. mSC provides network services while on the move. In this paper we propose a novel...
This paper investigates a three-node cooperative wireless powered communication system consisting of a multi-antenna hybrid access point (H-AP), a single-antenna relay and a single-antenna user. The H-AP first beams energy to the energy constrained relay and user in the downlink and then the relay assists the user using the harvested power for information transmission in the uplink. To maximize the...
In this paper, we consider two-hop multi-input multi-output (MIMO) relay wireless systems with energy harvesting. In each hop, transmit antenna selection (TAS)/receive antenna selection (RAS), TAS/maximum ratio combining (MRC), or maximum ratio transmission (MRT)/RAS is employed. Also, a relay harvests energy from the source via either a time switching-based relaying protocol (TSR) or a power splittingbased...
The mobile devices are becoming the important part in our day to day life. These are now one of the basic needs of our daily life. These devices are used to share the data of interest with one another. Data may be in the form of picture or video clip , news etc. But sometimes , data cannot reach to the user who is interested ,because of delaying of messages. Sometimes nodes do not want to loose their...
Delay Tolerant Networks (DTNs) are characterized by node mobility and partitioned network topology, extremely long delivery latency, etc. Consequently, the traditional ad-hoc routing algorithms cannot work well in DTNs. In order to provide effective communication services in DTNs, in this paper, we propose an adaptive routing based on Node Performance and Encountering Probability (NPEP). NPEP chronologically...
This paper investigates the problem of maximizing uniform multicast throughput (MUMT) for multi-channel dense wireless sensor networks, where all nodes locate within one-hop transmission range and can communicate with each other on multiple orthogonal channels. This kind of networks show wide application in the real world, and maximizing uniform multicast throughput for these networks is worth deep...
This work presents relay selection and beamwidth adaptation algorithms for millimeter-wave communication network by selecting best relay. Due to the high path loss, the mm-Wave links suffer from shadowling. Thus improving link availability is a challenge for the system designer. In this work, the link availability is further improved by optimal power allocation and beamwidth adaptation. The channel...
This paper considers multi-hop wireless backhaul in randomly distributed heterogeneous cellular networks. Following the framework of stochastic geometry, we model the distribution of access points with wireless backhauls and that of base stations with dedicated wired backhauls as two independent Poisson Point Processes. A routing protocol that aims to maximize the network throughput is proposed. To...
Device-to-device (D2D) communication is one of the most promising solutions to the dramatic increase of wireless networks traffic load. In D2D communications, mobile nodes can communicate in a semi-autonomous way, with minimal or no control by the base station (BS). In this context, we address the problem of the coexistence of cellular and D2D tiers in the uplink frequencies, where a D2D source is...
Motivated by the observation that energy harvesting (EH) from radio-frequency (RF) signal is subject to fluctuations, multiple EH-enabled relays are employed to collaboratively enhance data communications in a device-to-device (D2D) network underlying a cellular system. Each relay is equipped with a single antenna and unable to harvest energy and transmit data simultaneously. Thus, the D2D user equipment...
Energy harvesting (EH) two-hop communications are considered. The transmitter and the relay harvest energy from the environment and use it exclusively for transmitting data. A data arrival process is assumed at the transmitter. At the relay, a finite data buffer is used to store the received data. We consider a realistic scenario in which the EH nodes have only local causal information, i.e., at any...
In this paper, the achievable rate of buffer-aided diamond relay systems under delay constraints is studied. The effective capacity, characterizing the maximum constant arrival rate to the source while satisfying the end-to-end delay constraints, is obtained for fixed decode-and-forward (DF) relaying schemes and selective relaying protocols. A selection relaying policy that maximizes the delay exponent...
In this paper, we consider a renewable energy powered wireless relay node which can work in either full- duplex (FD) or half-duplex (HD) mode. It decodes and stores data bits sent from source node, and then transfers them to destination node. We aim to maximize the average throughput from source to destination by optimizing the relay's working mode under the random energy arrival constraint. Optimal...
Energy harvesting (EH) enabled relaying has attracted lots of interests recently, as the network energy consumption can be reduced and the coverage range can be extended simultaneously. In most existing literatures, the Harvest-Store-Use (HSU) model is utilized to describe the energy flow behavior of the EH system. However, the half-duplex (HD) constraint of HSU that harvested energy can only be used...
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