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Nowadays energy efficiency has been one of the most urgent issues for Data center networks. Flow scheduling methods based on exclusive routing have been used to minimize the network energy while meeting the network performances, such as network throughput, and flow deadline. However these energy efficient exclusive routings only maximize the utilization of ports, which may leave switches underutilized...
Deep packet inspection (DPI) technology has conventionally been introduced for traffic monitoring, bandwidth control, bandwidth allocation, access control of specific types of traffic, etc. By installing a DPI equipment at any arbitrary point in a network, it is possible to monitor communications of many servers simply and this could simplify dramatically the conventional work load for system management...
Internet usage is increasing very rapidly. Increased usage of IP telephony and internet is increasing the need for unique IP addresses. IP address can be reused by using Network Address Translators (NAT). NAT is used for reusing IP addresses by connecting a series of nested private networks to public network under a single public IPV4 address. STUN and TURN protocols are used to identify the hosts...
A dominant trend nowadays is the rapid spread of small devices, such as laptops and smartphones, carried by people. The users' need for applications with local high-bandwidth requirements and due to limited wireless Internet access, a challenge if identified which is critical for the success of applications such as local wireless data synchronization, gaming or communication. Opportunistic networks...
Millimeter wave communications is a promising technology for future multi-Gbps wireless networks. However, the wide bandwidth and high sampling rate requirement involved leads to significant power consumption in the communication systems. In this paper we propose a subband based subsampled system architecture for indoor millimeter wave communications with a primary objective of improving energy efficiency...
Energy saving in the ICT equipments has been an urgent problem recently. Although the average utilization of network is less than 40% most of the time, its energy consumption is almost the same as peak-hour's. In order to minimize energy consumption and improve resource utilization, we aggregate traffic into a network subset and turn off the remaining network elements. The problem is the classical...
To mitigate the “Power Wall” challenges for both mobile devices and data centers, accelerator-rich architecture with normally-off mode has been intensively studied recently. Power/energy optimization in high-level synthesis for accelerator design is critical for such accelerator-rich architecture. The emerging nonvolatile memory (NVM), offers many benefits such as ultra-low leakage power, high density,...
Methods to upgrade the network infrastructure to cope with current traffic demands has attracted increasing research efforts. A promising alternative is signal slicing. Signal slicing aims at re-using low bandwidth equipment to satisfy high bandwidth traffic demands. This technique has been used also for implementing full signal path symmetry in real-time oscilloscopes to provide performance and signal...
Long Term Evolution-Advanced (LTE-A) that promises better support to richer applications is expected to catalyze the explosive growth in the number of subscribers and their demand for traffic. Such unprecedented growth will push the limits of energy consumption in the operators network. Hence, there is a need to introduce power saving mechanisms in LTE-A to minimize the energy consumption. In this...
Challenges of CMOS ADC implementations for 100 Gb/s optical communication systems and beyond are highlighted. Limitations and opportunities of architectures and circuits are discussed based on a 56–90 GS/s 8 bit ADC in 32 nm SOI CMOS.
The manuscript describes the design and implementation of a low-power, fully differential switched-capacitor ΣΔ modulator in STM 90-nm CMOS technology, for sensor interface applications. With the aid of an accurate behavioral model, the power consumption is minimized without sacrificing the effective resolution. Through the optimization of single-stage integrators, with feed-forward summation, and...
This paper presents a three-channel frontend system for fetal monitoring applications which includes three amplification chains, an ADC and all power management circuitry needed to feed the different building blocks from a single 1.4V supply. The specifications of the proposed system (0.38μVrms equivalent input noise, 74.5dB dynamic range and 0.5 to 200Hz signal bandwidth) are determined according...
This paper presents the design and simulation of a time-interleaved delta-sigma modulator as part of a digital transmitter chain. The architecture is chosen based on a critical path analysis in order to reach very high frequency operation. The modulator's configurability allows it to target signal bandwidths from 20 MHz up to 160 MHz with a SNR greater than 67 dB. Finally, the modulator is synthesized...
In this paper, we propose a new power save operation as well as the corresponding protocol, called WiFi in Zizz (WiZizz), which judiciously exploits the characteristic of the channel bonding defined in IEEE 802.11ac and efficiently handles the channel bandwidth in an on-demand manner to minimize the traumatic energy spent by IEEE 802.11ac devices. Our extensive measurement and simulation show significant...
This paper addresses design considerations for power-efficient pipelined continuous-time (CT) incremental Sigma-Delta (IΣΔ) ADC architectures. By pipelining identical CT IΣΔ ADC stages, the proposed architecture provides the design freedom coming from both the pipeline ADC and the IΣΔ ADC. In searching for a low-power solution given a target resolution, different configurations are examined analytically...
Energy consumption in Information and Communication Technology (ICT) is 10% of the total energy consumed in industrial countries. Recently, Virtualized Network Environment (VNE) has been emerged in this technology. Therefore, it is essential to develop novel techniques that reduce VNE's energy consumption. In this paper, we formulate a Binary Integer Linear Program (BILP) that reconfigures already...
In cloud computing, an important issue is virtual machine placement (VMP), selecting the most suitable set of physical hosts for a set of virtual machines. In this paper, we present a novel solution to the VMP problem called VMPMBBO. Our scheme treats the VMP problem as a complex system, and utilizes the biogeography-based optimization (BBO) technique to optimize the virtual machine placement that...
As energy consumption increased in data centers, various efforts have been made towards higher energy efficiency. Energy consumption is the main reason of high cost incurred by data centers in required Quality of Service constraints. In particular, Live Virtual Machine migration in data centers has great potential to decrease energy consumption up to certain level of usage. One of the mechanisms to...
In this paper we present the design of an ultra low power analog four quadrant multiplier based on second generation current conveyor(CCII). The main attractive feature of the proposed multiplier is that it is based on dynamic threshold MOS transistor (DTMOS). Due to use of DTMOS, the power consumption of proposed multiplier has been reduced by 99.92 percentage as compared to its conventional version...
Everything in nature tries to reach the lowest possible energy level. Therefore any natural or artificial system must have the ability to adjust itself to the changing requirements of its surrounding environment. In this paper we address this issue by an ECG sensor designed to be adjustable during runtime, having the ability to reduce the power consumption at cost of the informational content. Accessible...
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