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We consider a special family of spatially coupled low-density parity-check (LDPC) codes known as LDPC convolutional codes and propose a design technique based on symbolic hyper-graphs aimed at achieving good codes with small syndrome former memory order. We define conditions on the minimum syndrome former memory order that must be imposed in order to avoid short local cycles in the codes Tanner graphs...
This paper deals with design and development of a bidirectional coupling unit which is necessary to make measurements on the electrical low voltage distribution network for narrowband characterization of the power line channel. This coupling unit provide impedance matching and instruments protection. The designed coupling unit is verified by simulation and experimental measurement. Live measurements...
Attention paid to energy efficiency in datacenters has been increasing significantly in the last decade. One of the latest trends on this issue is supplying datacenters with renewable energy, and reducing the carbon footprint of datacenters is a major step towards green computing. Following this trend, more and more datacenters are built in cold climate areas for cheaper cooling and increased energy...
In this paper, we apply generalized telegrapher's equations in analysis of to two coupled wires. By the constant current approximation, a lumped circuit model of wireless power transfer between the two is derived from the full-wave model. In order to test its applicability, estimations of mutual inductivity and system input impedance provided by the circuit model are compared to the full-wave model...
Performing an accurate 3D surface scan of everyday objects is sometimes difficult to achieve. Using the 3D scanner as a main sensor in a fast-moving mobile robot emphasizes this issue even further. When small robots with limited payload are considered, the professional Lidar systems are not likely to be embedded due to their weight, dimensions and/or high cost. Introduction of simple structured-light...
In wireless systems, localization is still an important challenge to ensure innovative based services solutions. In this paper, a novel localization algorithm which intends to improve robustness and accuracy of previous work based on regression tree is proposed. The suggested approach is a learning based ensemble technique which combines several regression trees. Anchor selection procedure is associated...
Formal Concept Analysis (FCA) developed in the last 30 years to a prominent field of Knowledge Discovery, Processing and Representation. Well-known for its intuitive representation of conceptual structures as order diagrams, FCA handles conceptual hierarchies which can be derived from various data sets. This makes FCA suitable for knowledge management tasks in many fields. We consider the problem...
Recent years have witnessed that standard telecommunication services evolved more and more to complex value-added services. This fact is accompanied by a change of service characteristics as new services are designed to fulfil the customer's demands instead of just focusing on technologies and protocols. Besides, service providers have to consider a fast transition from concept to market product as...
LepidaSpa, the in house company of all the Public Administrations of Emilia-Romagna region, successfully led a feasibility analysis for the creation of a sensors network to monitor the energy consumption in public buildings to support actions towards energetic saving. The innovative aspects of the solution adopted mainly concern the extreme simplicity of the network architecture used, the ease of...
The residual BER — error floor, though useful and widely used metrics for the end-to-end digital radio transmission performance, provides no insight into the error-generating analog impairments (e.g. modulation inaccuracy, power amplifier compression, carrier recovery phase error, or I-Q cross-talk), which, however, are easy to identify by VSA tools such as constellation analysis. As the EVM analysis...
Cloud computing offers benefits of sharing computing and network resources among multiple mobile network operators. To utilize such benefits, in earlier paper we proposed a platform called telecommunication network as a service (TaaS). Sharing of such resources in cloud technology affects security of whole mobile network in general and software defined network (SDN) & network functions virtualization...
Network Virtualization, which allows the coexistence of various logical networks on shared physical infrastructure, has become popular in recent years. The optimal mapping of virtual resource to physical resource is a major issue in network virtualization. This problem, called virtual network embedding (VNE), has been well explored in the context of one physical domain, which is in practice operated...
The paper reviews the use of deterministic-stochastic models some areas of computational electromagnetics where there is an uncertainty in the input data set, i.e. where some properties of a system are partly or entirely unknown. In such problems a simple stochastic collocation (SC) method is used to properly assess relevant statistics about given responses. The SC approach also provides the assessment...
The end-point of the cloud trend is that all computational and storage resources leave the homes and move to the cloud. We can be rather certain the future eventually looks like this as IT and telecommunications services are commoditised and the end users' time, interest and skill to acquire and maintain electronics fade away. The network architecture suitable for such scenario will be analysed in...
This work presents and analyzes the results of millimeter-wave propagation simulations performed for over the sea LoS ship to ship communication channels. We present a channel characterization study where channel parameters such as path loss, received power, RMS delay spread, and power delay profile are obtained by using a ray tracing approach. 5G candidate frequencies, 35 GHz and 94 GHz were chosen...
The paper describes the measurement of Wi-Fi devices radiation using smartphone. Wi-Fi devices are present both in public areas as well as in homes, therefore it is important to know their radiation. Measurements of the radiated levels included a few typical places indoors and outdoors where there was the largest possibility of exposure to the Wi-Fi radiation. The measured results showed that the...
The aim of this research is to enhance the performance of the Fast Re-Route (FRR) mechanism by adopting a methodology similar in many aspects to that used in Software Defined Networking (SDN). This methodology is represented by using a central controller to calculate the paths of backup MPLS tunnels that are used to protect previously established primary MPLS tunnels, and a messaging system to install...
As wireless technologies inside smart cars are increasing, Vehicular Ad hoc NETworks (VANETs) are becoming a promising way to enhance driver and passenger safety by enabling each vehicle to provide a warning in real time when a critical event is predicted. These applications require reliable broadcast schemes with minimum access delay and transmission collisions, which thus increase the need for an...
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