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This study focuses on the statistical properties of the Power Delay Profile (PDP) and path loss results at 5.9 GHz for the indoor environment. The measurement campaign was conducted by using a 5.9 GHz channel sounder to extract the characterization of the indoor radio channel. The successive PDP of our measurement data is presented and statistical properties of mean delay and RMS delay spread is investigated...
We consider a collocated WLAN with Nac 802.11ac users using dynamic 20/40 MHz channel access and Nl 802.11a/n legacy users operating in the secondary 20 MHz channel. Under ideal channel conditions, we seek to characterise the saturation throughput performance of the 802.11ac users and the legacy users. We propose an analytical model based on a decoupling approximation for saturation throughput analysis...
Infrastructure as a service (IaaS) is a form of cloud computing, which converts physical machines (PMs) to various types of resources by virtualization technology, and delivers these resources to customers by a on-demand way. However, different customer requirements complicate the usage of resources. In this paper, we employ a high level formalization way, Performance Evaluation Process Algbra (PEPA),...
Modern networks for converged services (voice, video and data) require appropriate planning and dimensioning. In this paper, we present a methodology for dimensioning the link capacity and packet delay in stream, IP multi-service networks with QoS requirements, in which discrete-event simulation is essential. The model may be used in the lack of enough reliable real-world data, since it is initially...
Two novel active frequency selective surfaces (AFSS) are proposed in this paper. Long Term Evolution (LTE)-AFSS and WiFi-AFSS are made up of square loop patch and half circular loop patch for shielding 2.1GHz and 2.45GHz signals respectively. PIN diodes inside AFSSs are used to realize the switching between transmission and reflection characteristics. In addition, both AFSSs have large holes for the...
In a SDN-based data center network, the controller used greatly affects the behavior of the network. In this paper, the observation is conducted to describe the effect of various link failure scenarios to data center network performance using the Ripl-POX controller. Results shown in this paper can be used as a consideration for both controller selection or building for managing the data center and...
In this paper, we propose an analytic model that takes as inputs a) a parametric microarchitecture-independent characterization of the target workload, and b) a hardware configuration of the core and the memory hierarchy, and returns as output an estimation of processor-core performance. To validate our technique, we compare our performance estimates with measurements on an Intel® Xeon® system. The...
SDRAM is a shared resource in modern multi-core platforms executing multiple real-time (RT) streaming applications. It is crucial to analyze the minimum guaranteed SDRAM bandwidth to ensure that the requirements of the RT streaming applications are always satisfied. However, deriving the worstcase bandwidth (WCBW) is challenging because of the diverse memory traffic with variable transaction sizes...
Under the constraints of limited bandwidth and exponentially rising user demand, there is a dire need to maximize throughput. Maintaining Quality of Service (QoS) in a communication network demands congestion control with high accuracy. This paper focuses on this challenging task that incorporates design of effective congestion controller to reduce packet loss in cognitive radio networks. Limited...
This article describes an approximate model of a group of cells in the LTE network with implemented load balancing mechanism. An appropriately modified model of Er-lang's Ideal Grading is used to model this group of cells. The model makes it possible to take into account limited availability of resources of individual cells to multi-rate traffic streams. The developed solution allows the basic traffic...
The necessity of frequency re-farming from the aspects of spectrum demand, frequency efficiency and economic benefit is analyzed. The strategies of frequency re-farming are proposed to demonstrate the feasibility of the system. Then Monte Carlo simulation is used to calculate the coverage prediction on LTE network in rural areas. Simulation results show that after frequency re-farming, the 800M LTE...
In this paper, we have proposed a localized dual-mode model to study push-pull modulation responses of DFB lasers. Numerical simulation shows that, with properly designed and controlled photon-photon resonance, an ultra-broad 3dB modulation bandwidth up to 50GHz is achievable.
This paper presents an analytical model for quantifying the reactive routing overhead in Mobile Ad-hoc Networks (MANETs). The overhead is characterized as a function of network mobility and traffic load. Also, a numerical model for determining the optimal cached route Time-To-Live is derived to minimize the overhead depending on network mobility and traffic load. The final result shows the minimum...
This paper proposes a novel approach for System Level Debug and Performance Evaluation that exploits the signal level and clock cycle accuracy existing in Bus Cycle Accurate hardware IP models along with the advantages of untimed Transaction Level Modeling. The developed toolset can be integrated in SoC simulations in a nonintrusive manner which secretly embeds performance figures and debug information...
Long Term Evolution (LTE) technology application in Indonesia has limited on contiguous frequency allocation for the cellular operator. Release 10 3GPP generated LTE-Advanced which supports carrier aggregation feature. In this paper, the design of LTE-Advanced uses 20 MHz bandwidth by comparing carrier aggregation inter-band non-contiguous scenario on 900 MHz and 1800 MHz frequency and intra-band...
Image processing algorithms which only work on a local neighbourhood are nearly used in every image processing application. Very often several iterations are performed on a fixed neighbourhood which leads to the description of stencil codes. A promising approach in embedded systems is to use the massively parallel computation power of an FPGA for this kind of algorithms. This not only speeds up processing...
Experimental design of a FICA antenna is presented. The FICA antenna is first simulated using the FDTD method for selected factors which may affect the performance of the antenna. The most sensitive factors and their interactive effects are identified by using the design of experiments (DOE) technique. In addition, the estimate formulations of the output parameters for characterizing antenna performance...
We propose an analytic approach to the frequency bandwidth dimensioning problem, faced by cellular network operators who deploy/upgrade their networks in various geographical regions (countries) with an inhomogeneous urbanization. We present a model allowing one to capture fundamental relations between users' quality of service parameters (mean downlink throughput), traffic demand, the density of...
Today's video streaming platforms offer videos in a variety of quality settings in order to attract as many users as possible. But even though a sufficiently dimensioned network can not always be provided for the best experience, users are asking for high QoE. Users consume the content of a video streaming platform in different ways, while video delivery platforms currently do not account for these...
In this paper we show how to analytically model two widely used distributed matrix-multiply algorithms, Cannon's 2D and Johnson's 3D, implemented within the Intel Concurrent Collections framework for shared/distributed memory execution. Our precise analytical model proceeds by estimating the computation time and communication times, taking into account factors such as the block size, communication...
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