This paper evaluates the use of a back-to-back modular multilevel converter (B2B-MMC) in offshore low frequency (LF) AC transmission. The scheme is compared to two alternative transmission technologies: DC and 50Hz AC. The MMC topology is further compared to a cycloconverter. A high level design of a ±120kVdc, 250MW B2B-MMC system is described, with the…
Tags: OMNeT++ AD Hoc
SAVE: Energy-aware Virtual Data Center embedding and Traffic Engineering using SDN
Cloud computing is a popular computing paradigm which provides the virtual resource as a form of VM to customers in an on demand manner. Existing provisioning solutions were only limited to provision computing resource (e.g., CPU, RAM and etc.), therefore, it was difficult to provide more advanced cloud services. Virtual Data Center (VDC) embedding, which…
Gain enhancement of butler matrix fed antenna array system by using planar circular EBG units
In this paper planar circular Electromagnetic Band Gap (EBG) structures have been implemented in the Butler matrix fed antenna array system to improve the radiation performance of the system. Initially a conventional 4×4 Butler matrix fed antenna array system has been designed at 14.5 GHz. Asymmetricity in the gain values of major beams of the…
100 GHz reflectometer for sensitivity analysis of MEMS sensors comprising an intermediate frequency Six-port receiver
Due to the growing market for Micro Electro Mechanical Systems (MEMS), especially for the application in mobile electronic devices like cameras, phones or tablet computers, cost and time efficient test and evaluation systems are required for the production process. This work presents a novel measurement setup for MEMS microphones, that allows an inline, contactless evaluation of…
Distributed control plane with spectral fragmentation-aware RMSA and flexible reservation for dynamic multidomain software-defined elastic optical networks
We propose a distributed control scheme utilizing spectral fragmentation-aware RMSA and flexible active/passive reservation mechanism for dynamic multi-domain software-defined elastic opticalnetworks. Our proposed scheme offers significant blocking probability reduction compared to conventional GMPLS/PCE architecture.
Mobile access of the DVB-T channel and the opportunity for cognitive spectrum utilization
The main goal of the Cognitive Radio (CR) systems is the intelligent and efficient utilization of the radiospectrum. In this paper we introduce our survey in wideband spectrum measurement for studying the Terrestrial Digital Video Broadcasting (DVB-T) frequency bands that are one of the future candidates for cognitive radio applications. The actuality of this subject is that during 2013 Hungary changed the…
Exact Outage Analysis in Cognitive Two-Way Relay Networks With Opportunistic Relay Selection Under Primary User’s Interference
In the current study of cognitive relay networks, most related works focus on the effect of interference from secondary users (SUs) to primary receivers (PRs), while neglecting the links from primary transmitters (PTs) to SUs. In this paper, the interference both from SUs to PRs and from PTs to SUs is considered in the analysis…
Performance of Cognitive Hybrid Automatic Repeat reQuest: Stop-and-Wait
Detecting spectrum holes and efficiently accessing them are the two basic functions that enable acognitive radio (CR) to make use of the licensed spectrums of a primary radio (PR). In this paper, we consider a CR scheme, which opportunistically accesses a PR channel for communication between a pair of nodes based on the stop-and-wait hybrid automatic repeat request (SW-HARQ).…
Least squares based channel estimation approach and Bit Error Rate analysis of Cognitive Radio
Cognitive Radio (CR) is very essential in day-to-day life as there is a growing demand for usage of frequency spectrum for different wireless applications. Being an opportunistic communication scenario,cognitive radio performance analysis attains prime significance. Performance analysis of a cognitiveradio scenario in a wireless channel is done by a well-known performance metric Bit Error Rate…
Interference and X Networks With Noisy Cooperation and Feedback
The Gaussian K-user interference and M × K X channels are investigated with no instantaneous channel state information at transmitters (CSIT). First, it is assumed that the CSI is fed back to all nodes after a finite delay (delayed CSIT), and furthermore, the transmitters operate in full-duplex mode, i.e, they can transmit and receive simultaneously.…