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Social needs and demand changes fuel the technology to rise and meet those needs. Nowadays, users of wireless network communications tend to use their small size, limited powered mobile devices to access multimedia services with good quality of service anytime, anywhere. This implies more power consumption and raises the need for energy efficiency in doing more work with less power consumption. WiMAX...
The energy consumption of memory is one of the important metrics to evaluate memory systems. However, previous approaches such as using cycle accurate CPU and memory simulators require a long execution time for simulation. We are developing a model of energy consumption of DRAM-and NVM-based main memory, which allows estimating the energy consumption of a memory subsystem from easily observable performance...
Opportunistic spectrum access is a key technology for the development of novel applications with stringent QoS requirements on top of wireless sensor networks. However, the many challenges posed by opportunistic spectrum access itself are further exacerbated by the power constrained nature of wireless sensors and the QoS requirements of the applications to be supported. In this work we consider the...
Many recent studies have proposed energy efficient approaches that use various techniques such as Dynamic Voltage Scaling (DVFS), CPU idling, and server consolidation in data centers. Also, many networking problems could be introduced by server consolidation techniques. In this research, we introduce an enhanced technique called Network and Power Aware (NPA) server consolidation that will dynamically...
As the market of Internet of Thing (IoT) exponentially grows, lightweight cryptographic algorithms have become necessary and important. Lightweight Encryption Algorithm (LEA) was recently developed for lightweight and low power consumption. LEA requires countermeasure techniques against differential power analysis (DPA) attacks that are known to be one of the most effective side channel attacks. In...
A hybrid 2b-1b/cycle, two-step asynchronous SAR ADC exploiting the passive residue transfer technique is reported in this paper. The removal of the residue amplifier results in much savings in the time and power consumed for the residue transfer process. Moreover, the 2b-1b/cycle conversion scheme assisted by the asynchronous time allocation during the bit cycles further enhances the conversion speed...
Real-time navigation of autonomous vehicles requires the processing of a large amount of sensor data by the perception algorithms onboard the vehicle, like object detection and localization. To meet the driving performance and safety requirements, these algorithms require the hardware to be over-engineered to always operate for the worst-case. This leads to excessive power consumption by the computation...
The enormous increase in wireless enabled devices has posed a great challenge for effective resource sharing in Wi-Fi networks. This challenge has triggered the re-evaluation of wireless resource sharing protocols. Available frequency spectrum is probably the most valuable network resource. Therefore, effective utilization of this scarce resource is highly desired. The traditional channelization of...
Cognitive radio may discover more idle (unoccupied) spectrum by spending more power for spectrum sensing, while the transmission power can be reduced by using more spectrum (bandwidth). We analyze the tradeoff between the sensing power and transmission power in achieving a given throughput in cognitive radio networks and examine the optimum sensing bandwidth that maximizes the energy efficiency, defined...
Heterogeneous network has recently been proposed as a promising approach for improving capacity and coverage. A large number of low power nodes will consume a lot of energy, which is not conductive to improve the network Energy Efficiency (EE). In this paper, in order to improve network EE, an energy-efficient time-frequency domain interference coordination algorithm is proposed. Firstly, a novel...
As processor power density increases, thermal and power control becomes critical for application processing. In this paper, we consider network applications which feature ON/OFF execution pattern, that causes frequent temperature and power consumption changes in the processor. A novel power aware thermal management algorithm is designed to achieve power saving in multicore processors by employing...
In this paper, we propose a novel polynomial time algorithm, called Frequency Driven Mapping, to map real-time streaming applications specified as cyclo-static dataflow (CSDF) graphs onto a cluster heterogeneous MPSoC. The objective of our mapping approach is to reduce the energy consumption and guarantee latency and throughput constraints. The main novelty in our mapping algorithm is twofold: 1)...
Nowadays in optical communications, equalizers to compensate chromatic dispersion have a large impulse response and throughput, therefore the VLSI implementation of this filters are carried out in frequency domain to reduce its complexity and thus achieve a lower power consumption. Designers facing developments of frequency domain filters have defined in advance the throughput and the impulse response...
In cellular systems, the relaying technique is used for increasing service coverage, system capacity, and cell- edge user throughput at a relatively low cost. However, the introduction of relay stations (RSs) leads to a more complex intra-cell and inter-cell interference problem between the base station (BS) and RSs. The fractional frequency reuse (FFR) is one of the most simple and efficient (thus,...
In-band full duplex (IBFD) is a promising technique that allows to potentially double the achievable bi-directional throughput over a given bandwidth. Moreover, it has been estimated that IBFD-equipped wireless networks can be more energy-efficient than half duplex ones due to the reduced energy cost of packet collisions. However, one key challenge for implementing an energy-efficient IBFD system...
In this paper, we investigate the energy-efficient resource allocation problem for the device-to- device (D2D) communications overlaying LTE networks, where the D2D user equipment (UE) shares the spectrum with the cellular UE in an orthogonal way such that the interference between them is completely eliminated. We consider both the non- orthogonal and orthogonal resource allocation strategies for...
Over the last decade, the explosive increase in demand of high-data-rate video services and massive access machine type communication (MTC) requests have become the main challenges for the future 5G wireless network. The hybrid satellite terrestrial network based on the control and user plane (C/U) separation concept is expected to support flexible and customized resource scheduling and management...
Fifth Generation (5G) networks will compromise of heterogeneous networks (HetNets) with macrocell overlaid with lower power small cells to achieve higher throughput by offloading users with low signal-to-noise-ratio from macrocell to the small cells. In this paper, we proposed a multi-objective optimization problem (MOP) to jointly investigate the tradeoff between throughput and backhaul energy efficiency...
Execution time is no longer the only performance metric for computer systems. In fact, a trend is emerging to trade raw performance for energy savings. Techniques like Dynamic Power Management (DPM, switching to low power state) and Dynamic Voltage and Frequency Scaling (DVFS, throttling processor frequency) help modern systems to reduce their power consumption while adhering to performance requirements...
In an ad hoc network, communication distance is limited by the need to minimize the power consumption of the communication nodes. To deal with this, we usually employ multi-hop relaying functions that use the number of hops as a routing metric. But in an environment where traffic density is high, the same relaying node may be used by multiple sending nodes due to their spatial distribution. Data packets...
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