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In this paper, a novel V-band antenna configuration is modeled for multiband/wideband application. Multiband and wideband stack series array antenna were designed for the future 60 GHz in 5G application. Dual-layer substrate Technology was utilized in order to achieve a higher bandwidth which is needed to cover the V-band electromagnetic spectrum ranges from 50 -70 GHz. Total of 25 antenna array configurations...
Linear active disturbance rejection control (ADRC) is known for its simplicity and its performance in disturbance attenuation. Currently, tuning of linear ADRC is via the bandwidth idea proposed in [1]. It is first shown that there are some limitations using only two bandwidths to tune the linear ADRC controllers. In this paper, tuning of linear ADRC with extra model dynamic information is investigated...
This paper evaluates the performance of partition scheme with first-last fit spectrum allocation for elastic optical networks. The scheme intends to increase the number of contiguous aligned available slots, and hence suppresses the blocking probability. The partition approach creates more aligned available slots by separating the spectrum allocation of the non-disjoint connections. The first-last...
Data centers are considered as the indispensable infrastructure for cloud services nowadays. However, large-scale data centers use the traditional TCP protocol may experience performance issues, such as TCP incast. TCP incast is caused by the deficiency of TCP works for many-to-one traffic patterns on high-bandwidth, low-latency networks. In this paper, we propose a new TCP variant named Threshold...
Cloud computing uses internet data centers to host applications and data storage. Cloud computing resources and services are offered to customers on pay-per-use model while the quality of the offered resources and services are defined using service level agreements also known as SLAs. Unfortunately, there is no standard mechanism to verify and assure that services delivered by the cloud provider satisfy...
Direct short-range device-to-device (D2D) communication enjoys many advantages, such as high transmission rates, low propagation delays, low transmit power and interference. In order to realize the advantages, a device or user equipment participating in the D2D communications have to determine that the devices discovered are in a proximity area and are suitable to establish links with them. Hence,...
A 900MHz frequency synthesizer is presented in this article. The purpose of the proposed architecture is to minimize lock time in Phase-Locked Loops (PLLs). The basic idea behind this topology is using a larger loop bandwidth and gain during the frequency switching transition and shifting gradually the loop bandwidth to the normal value after the PLL is locked. The structure has been simulated by...
Due to the rapid growth of Software-Defined Networks, we can manage network traffic easier than before. One of the major issues on SDN is the multipath routing protocols due to its complexity of optimum path selection among the multiple routes. In this paper, we focus on Multipath TCP (MPTCP). MPTCP is an extension of TCP that increases the throughput of TCP communication significantly by utilizing...
Traffic offloading is an attractive solution for the operators to increase the system radio capacity in the future cellular networks. Device to Device (D2D) technology helps achieve this goal by allowing direct communication between closely located user devices. However, as D2D devices transmit on the cellular network uplink bandwidth, the communication mode selection should be properly studied in...
Reconfigurable circuit design has become very important in the last decade for increasing the lifetime of CMOS circuits in deep sub-micron technologies. Sense & React approach is one of the reconfigurable design approaches, where degradation in a circuit performance is detected via sensor circuitry and a pre-established recovery operation is applied to circuit. However, sense operations are quite...
With the modern microwave technology development, more requirements for ultra-wideband and miniaturization power divider are put forward. In this paper, we use meandering and corner cutting technology to reduce the physical size of the power divider, and use the cascade of quarter wave impedance matching converter to expand the bandwidth of power divider. A power divider which dividing power into...
The recent advent of stacked memory devices has led to a resurgence of researchassociated with the fundamental memory hierarchy and associated memory pipeline. The bandwidth advantages provided by stacked logic and DRAM devices haveinspired research associated with eliminating the bandwidth bottlenecksassociated with many applications in high performance computing. Further, recent efforts have focused...
A low-power biomedical signal acquisition SoC is proposed for continuous health monitoring system. The SoC fully integrates a low-noise analog front-end (AFE), a current-steering low-pass filter (CSLPF), and an output buffer. A DC-rejection loop and a chopping function are added to enhance the noise performance. For processing various bio-signals, the bandwidth can be adjusted to extract the signals...
In this work, we propose an optimal design for the crescent-slot nanoantenna for energy harvesting applications. By tuning the axial ratio of the two ellipses comprising the antenna, the band and field intensity of the nanoantenna can be controlled. Full wave electromagnetic simulations using COMSOL and HFSS have been carried out to show the efficiency of this approach.
A novel broadband metamaterial absorber based on cross dumbbell-shaped structure and loaded lumped resisters is proposed in this paper, which consists of three metallic layers separated by two dielectric substrates. Five metallic vias connect three metallic layers. This absorber can achieve 90% absorption from 5 to 12.1 GHz under the normal incidence, equivalent to a relative absorption bandwidth...
This paper proposes a new frequency selective surface (FSS) based on the combination of four sinusoidal-waveform like shapes, each formed by the combination of two semi-circles, for an overall arrangement similar to a square shape. The proposed design was simulated and evaluated through a commercial electromagnetic (EM) simulation software. The sine-square FSS has a relatively simple design, yet provides...
This paper presents a compact low-profile elliptical planner antenna for UWB applications. The antenna is fabricated using Rogers 5880 LZ substrate, conducting patch, and conducting ground plane. The antenna size is 41.95mm×21.2 mm×1.27mm. The operating bandwidth of the designed antenna is from 2.5–10.5 GHz, which make the antenna useful for UWB applications. The length of the ground plane is selected...
The introduction of new diagnosis treatment systems and devices in hospital environments presents an enormous challenge in terms of strategies and operational planning. These systems, which are generally interconnected, generate huge volumes of information of a heterogeneous nature that may be processed using resources that are external to the hospital. Correct design of hospital communications would...
In this work we implement features for IEEE 802.11ac in the NS-3 simulator, in particular wider channels and bit-error calculations for higher modulation coding schemes. We also implement four wireless LAN deployment scenarios from the 802.11ax working group scenario document, and evaluate their performance under different operating conditions. Our simulation results demonstrate that many nodes in...
With licensed spectrum at a premium, recent interest has shifted to investigating the possibility of utilizing unlicensed bands as a means of providing additional bandwidth. License assisted access (LAA) and Long Term Evolution-Unlicensed (LTE-U) are radio access technologies (RATs) aimed at providing carrier-grade wireless service in the 5 GHz unlicensed spectrum. Since Wi-Fi devices are widespread...
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