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With the recent proliferation of the Internet-of-Things (IoT) devices, coupled with the expected massive growth in the deployment of such devices, the 3GPP Specifications continued to evolve to address the performance needs and the cost/complexity reduction requirements of these IoT devices, achieved through the introduction of new features and new User Equipment (UE) categories. These features will...
A non-orthogonal multicarrier signal, termed spectrally efficient frequency division multiplexing (SEFDM), is investigated in this work. It improves spectral efficiency by compressing sub-carrier spacing below the symbol rate at the cost of self-created inter carrier interference (ICI). Sphere decoding (SD) is an efficient method to recover signals approaching maximum likelihood (ML) performance....
In the set disjointess problem, we have k players, each with a private input X^i ⊆ [n], and the goal is for the players to determine whether or not their sets have a global intersection. The players communicate over a shared blackboard, and we charge them for each bit that they write on the board.We study the trade-off between the number of interaction rounds we allow the players, and the...
In this paper a Markov decision process (MDP) model for virtualized content delivery networks is proposed. We use stochastic optimization to assign cloud site resources to each user group. We propose how quality of experience (QoE) can be included in the modeling and optimization. We then present an optimal solution for a constraint-free version of the problem, and show the improvement in accumulated...
We experimentally demonstrate transmission of 20×50-Gb/s WDM PAM-4 channels over an 80-km uncompensated fiber link, based on reduced complexity DSP and hardware. BER values below pre-FEC limit of 3.8×10·3 are reported, validating the proposed architecture for low-cost, high-capacity short-reach connectivity.
The exponential growth of available data has increased the need for interactive exploratory analysis. Dataset can no longer be understood through manual crawling and simple statistics. In Geographical Information Systems (GIS), the dataset is often composed of events localized in space and time; and visualizing such a dataset involves building a map of where the events occurred.We focus in this paper...
OFDM suffers from high spectrum sidelobes and lacks the ability to support an important feature of 5G and future wireless communications: flexible numerology. To overcome these shortcomings, we consider in this paper filtered OFDM (F-OFDM) as a candidate solution, which is able to provide greater flexibility and adaptability than traditional CP-OFDM. We propose filters constructed by filter banks...
Future 5G network provides network slices for applications of different areas on the same physical network. Low-latency is the most key indicators of demand for the slices. How to establish the low-latency network slices is an essential question. This article proposes a mapping algorithm for low-latency network slices based on linear programming. Firstly, this problem can be defined as a linear programming...
Space division multiplexing (SDM) has been proposed to cost-effectively increase the capacity of optical transmission systems. The cost savings can be realized by introducing some levels of spatial integration of elements. However, spatial densification increases the crosstalk (XT) interactions among spatial channels. The XT is expected to be mitigated by MIMO processing, however, it increases the...
In this paper, we investigate the relay selection (RS) problem in power splitting (PS) based energy- harvesting (EH) half-duplex (HD) relay networks, where the relays are wirelessly powered by harvesting a portion of the received RF signal power. We expand the relay selection problem in PSEH-HD relay networks to allow multiple relays to cooperate simultaneously. Furthermore, the optimal PS factor...
In this paper, we consider the problem of cyclic block construction, for frequency-domain equalization (FDE) of SOQPSK, using an intrafix segment in addition to the cyclic prefix. We propose a novel procedure to compute the intrafix symbols for SOQPSK-TG waveforms used in aeronautical telemetry. The proposed method is employed to generate an exact cyclic signal, which is a requirement for implementation...
This paper investigates a signal area (SA) estimation method for spectrum measurements. The spectrum measurements is for estimating statistical information of spectrum usage and required latency is not very critical compared to spectrum sensing. SA denotes the area (in time/frequency domain) occupied by the primary user's signal. The traditional approach, which utilizes Fourier transform (FT) and...
This paper proposes a Routing, Core and Spectrum Assignment (RCSA) algorithm based on the image processing Inscribed rectangle algorithm. The solution aims at discovering portions of spectrum capable of accommodating requests with low computational complexity. Advanced fitting policies are proposed to chose which portion of the spectrum to choose in order to reduce blocking and crosstalk. Results...
Heterogeneous cloud radio access network (H-CRAN) is proposed as a cost-effective paradigm to meet the ever-increasing mobile data traffic demand, where the key idea is applying cloud computing technologies in a heterogeneous network (HetNet) to improve both spectral and energy efficiencies of the cellular system. In this paper, we investigate how to provide as many as possible users with QoS-guaranteed...
In media production companies, exchanging large media files is daily business. Due to the predictable nature of network transfers in the media production industry, timeslot-based advance bandwidth reservation results in higher bandwidth utilization and improved network performance. Timeslot-based advance reservation can be based on flexible or fixed timeslot sizes. As the flexible approach is highly...
This paper addresses energy efficient VNF placement and chaining over NFV enabled infrastructures. VNF placement and chaining are formulated as a decision tree search to overcome this NP-Hard problem complexity. The proposed approach is an extension of the Monte Carlo Tree Search(MCTS) method to achieve energy savings using physical resourceconsolidation and sharing VNFs between multiple tenants....
Latest developments in satellite communications encompass semi-transparent transponder architectures. Such architectures have potentials i) to operate with enhanced frequency planning flexibility and physical layer specifications of evolving communications standards, and ii) to support dynamic reconfiguration of connectivity plans, especially desirable in packet switching transport modes. In this...
High-radix routers with low latency and high bandwidth play an increasingly important role in the design of large-scale interconnection networks such as those used in super-computers and datacenters. The tile-based crossbar approach partitions a single large crossbar into many small tiles and can considerably reduce the complexity of arbitration while providing throughput higher than the conventional...
As a result of increasing in diversity and complexity, real-time embedded systems have to deal with both periodic and aperiodic tasks. In such systems, it is expected that response time of aperiodic tasks is as short as possible. Total Bandwidth Server (TBS) is one of effective task scheduling algorithms for a mixture of periodic and aperiodic tasks. As a successor to TBS, Adaptive TBS (ATBS) is an...
In visible light communication (VLC) system, the Orthogonal Frequency Division Multiplexing (OFDM) technique has been widely used to achieve a high data rate transmission. However, OFDM will cause high peak-to-average power ratio (PAPR) in the VLC system. In this paper, we propose and experimentally demonstrate a new interleaved Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing...
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