Sparse MRI with a Markov Random Field Prior for the Subband Coefficients

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Trading Electricity with Blockchain Systems

On the wave of the development of new ICT technologies and renewable energy, the power system will certainly experience great changes to its outdated architecture over the next several decades. One of the key drivers of change in the power system is distributed energy resources. They are completely changing the paradigm of the power system as a system with a centralized hierarchy and one-way power flows from generation to customer and from high voltage to low voltage. Because the goals of net zero greenhouse gas emissions are gathering pace and are being accepted by countries around the world, slowdown in the integration of distributed energy resources cannot be expected. Another reason why we can expect faster integration is the development of technology for energy production which is becoming more available to power consumers. Because of the problems that are currently occurring in the distribution system, it is clear that the system must be modernized in line with the development of these technologies. The technology that will likely have the greatest impact on the modernization of the power system is blockchain technology combined with the smart grid paradigm. Blockchain has the ability to completely change the way the power system is managed and optimized for performance

Massive Machine-Type Communications via Hybrid OWC/RF Networks in Finite Block-Length Regime

In this paper, we investigate the design and analysis of a novel hybrid optical wireless communication (OWC/radio frequency (RF) solution uitable for massive machine-type communications (mMTC). We consider a two-tier network architecture where a massive collection of indoor OWC-based small cells, each consisting of low-cost Internet of Things (loT) devices and an OWC access point, are connected to the network infrastructure via an outdoor low-power wide-area network (LP WAN). Both indoor OWC and outdoor LP WAN tiers of the mMTC system deploy the Slotted ALOHA (SA) random access protocol. For the proposed hybrid OWC/RF loT system, we are interested in the error probability in the finite block-length regime, i.e., the probability that a short block-length data packet originating from an OWC-based loT device is delivered at its nearest LP WAN base station. Based on the derived error probability expression, we present numerical results that indicate important insights into the design of an SA-based hybrid OWC/RF loT system

Massive Machine-Type Communications via Hybrid OWC/RF Networks

In this paper, we investigate the design of a novel hybrid optical wireless communication (OWC)/radio frequency (RF) solution suitable for massive machine-type communication (mMTC). The proposed scenario consists of a massive collection of indoor OWC-based small cells that connect low-cost Internet of Things (IoT) devices to the network infrastructure via an outdoor low-power wide-area network (LP WAN), providing high scalability and connection density suitable for dense urban use cases. We assume both indoor OWC and outdoor LP WAN parts of the mMTC system use slotted ALOHA as a random access mechanism. The main contribution of this paper is in derivation of expressions for the packet loss rate, which provide insights into the considered system design as a function of the indoor OWC and outdoor LP WAN system parameters