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In this paper, we propose, design, and evaluate the use of transmitters mapping with a symbols encoding techniques to mitigate inter-symbol interference (ISI) and improve the overall VLC system performance while using a very simple receiver (single element wide field of view, (FOV)) with an OOK modulation scheme. The proposed technique with the laser diodes transmitters are able to provide data rates...
The offers on cloud computing infrastructure have focused on providing computing and storage resources, and consider the network mostly as a required add-on and not truly as a resource itself. However, the need to have more robust solutions is becoming clearer. This paper argues that cloud infrastructure services will evolve and allow the definition of complete infrastructures that comprise both computing...
The paper analyses the outcomes of numerical studies into the effect of phase dispersion on broadband elements of a FMCW signal with varying central spectrum frequencies corresponding to the central frequencies of radio channels. We used the International Reference Ionosphere (IRI) model as the background ionosphere, which takes into account the spatiotemporal variability of the radio channel. The...
In this paper, we propose a modeling approach for a Content-Centric Networking (CCN) network by considering the dynamics of its transport layer protocol. Transport layer protocols for CCN have mainly been investigated through simulation experiments because CCN itself is a complicated network architecture compared with IP, and the complex interaction between CCN caching and the behavior of a transport...
In flexible functional split, functions of a virtualized evolved NodeB (eNB) can be disaggregated in distributed computational resources. One of the main constraints for their placement is the latency experienced by the communication between the Virtual Machines (VM) hosting the functions. This paper evaluates experimentally the latency limits for different functional splits providing insights on...
Today, in the cloud computing context, the network is starting to arise as a true resource itself and not just as a required connectivity add-on. The ability to define network resources (e.g. routing/switching elements, bandwidth) in this context is still scarce, but there are clear evidences that this is a future reality. In this article, we consider that cloud infrastructure services will allow...
Dynamic Bandwidth Allocation (DBA) is a fundamental task in Ethernet Passive Optical Networks (EPONs). An EPON must use an efficient DBA to achieve good network performance. A variety of DBA algorithms have been proposed towards this end. Most of these algorithms use average packet delay as an important metric for measuring the performance of the algorithm. In this paper, algorithms for Time Division...
On-chip wireless links operating at millimeter wave frequencies offer the most promising solution to overcome the multi-hop latency and high power consumption of metal interconnects in Network-on-Chip (NoC) platforms. Design of efficient transceivers, that are resilient to channel effects is essential to achieve high performance on-chip wireless communication. In this work, we present a spectrally...
We investigate the problem of data-intensive vNF service chain (vNF-SC) orchestration in inter-datacenter EONs. After analyzing the NP-hardness of this problem, we solve it in a sequential manner by optimizing both the request serving sequence and the data-intensive vNF-SC orchestration. Specifically, we propose a request sorting algorithm and a data-intensive vNF-SC orchestration algorithm based...
Internet of Things (IoT) traffic will become increasingly heterogeneous not only in terms of traditional metrics as required bandwidth and maximum latency, but also in terms of functional requirements such as compute power and temporary storage. Sophisticated planning and engineering approaches must be adopted by service providers to account for this heterogeneity, inherent in IoT applications. Metropolitan...
The worldwide installation of Fiber-to-the-premises (FTTP) access network solutions is hindered by the high upfront cost of deploying ubiquitous fiber infrastructure. While passive optical networks can provide lower cost compared to point-to-point solutions, their total cost of ownership is still high for most operators to justify a mass scale deployment. Sharing passive optical network (PON) infrastructure...
The development of the fifth generation (5G) wireless technology is in progress to address the increasing demands for high capacity, low latency, and ubiquitous mobile access instigated by next-generation mobile and machine-centric applications. The Centralized/Cloud-Radio Access Network (C-RAN) architecture exploiting the small-cell paradigm has been identified as a promising approach to address...
There is strong recent interest in exploiting the millimeter wave (mmWave) frequencies for cellular communication. For signal transmission studies, one needs a channel model that can simulate the spatial variation of mmWave channel impulse responses (CIRs) in treated operating environments. We consider reconstruction of spatially varying CIRs by interpolation over a set of existing CIR snapshots for...
Inter-domain link congestion can be caused by either under-provision or peer disputes. TSLP and M-Lab are two representative network-tomographic methods to detect congestion on inter-domain links. In this work, we propose a performancecost framework to evaluate and compare the two methods via a simulator built atop NS-3. Via detailed simulations, we obtained some insights on the two approaches and...
In this paper, we address the need for motivating applications, such as mission critical industrial control and medical applications, to operate under the Ultra-Reliable Communication (URC) mode in the future 5th Generation (5G) cellular wireless networks, while also under strict Quality of Service (QoS) constraints such as ultra-low latency. Reliability has been shown to improve by using Hybrid Automatic...
Millimeter wave (mmWave) communication has been a key technology for the fifth generation (5G) wireless communications. There have been various mmWave channel measurements. However, many measurements in the literature are conducted with different configurations, which may have large impacts on the propagation channel characteristics, and make the comparison of propagation channel characteristics for...
Software-defined networking (SDN) has separated control and forwarding planes, which is a powerful approach to enable network virtualization by SDN hypervisors to share physical SDN networks among multiple virtual SDN in cloud data center. However, the centralized control and virtual network shared physical network are delicately weak and easy to failure if virtual topology embedding is not properly...
Modern enterprise server applications and networks demand higher memory bandwidth, throughput and capacity. These requirements are addressed by the next generation DDR5-SDRAM specification, doubling the data rate to DDR5-6400 per IO.
Joint allocation of spectrum and user association is considered for a large cellular network. The objective is to optimize a network utility function such as average delay given traffic statistics collected over a slow timescale. A key challenge is scalability: given n access points (APs), there are O(2n) ways in which the APs can share the spectrum. The number of variables is reduced from O(2n) to...
This paper considers a K-cell multiple access channel with inter-symbol interference (ISI). The primary finding of this paper is that, without instantaneous channel state information at a transmitter, the interference-free sum degrees of freedom of K is asymptotically achievable when the number of users per cell is sufficiently large, and also when the number of channel-impulse-response taps of desired...
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