1,720,964 research outputs found
L'influenza della deformabilità delle connessioni sul comportamento delle travi miste sottoposte ai carichi ripetuti
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Studio teorico e sperimentale di travi miste di acciaio e calcestruzzo sottoposte a carichi ripetuti
No full textPower Line Communications: Understanding the Channel for Physical Layer Evolution Based on Filter Bank Modulation
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Physical Layer Security in Power Line Communication Networks
No full textThis chapter digs into the secrecy provided and guaranteed at the physical layer, named physical layer security (PLS), over power line communication (PLC) channels for in-home networks. The PLC scenario peculiarities are briefly discussed in terms of channel characteristics and noise features. The effects of the channel properties on the performance are evaluated, in terms of the achievable secrecy rate, starting from the single-input single-output (SISO) scheme with additive white Gaussian noise. The results are also compared to the more common wireless scenario, namely a scenario where the channels are independent and experience Rayleigh fading as a consequence of rich scattering. Furthermore, the performance improvement attainable with the use of multiple-input multiple-output (MIMO) transmission is discussed. The effect of increasing the transmission band 2-30 to 2-86 MHz and the effect of colored spatially correlated noise is also investigated. Moreover, a non uniform power allocation strategy, provided by the application of an alternating optimization (AO) approach is evaluated. A comparison with the channel capacity, achieved without secrecy constraints, is also performed. The experimental results are provided relying on measured noise and channel responses
Considerations on narrowband and broadband power line communication for smart grids
No full textThe high amount of applications to be implemented in the Smart Grid requires bi-directional connectivity between a multitude of nodes with a reliable, high speed, low latency, energy efficient and cost effective communication technology. Power line communication (PLC) has the potentiality to meet the requirements. Indeed, there exists space for PLC technology improvements and to overcome the challenges mostly due to a hostile communication medium. There are two considered frequency spectra: A narrowband (3-500 kHz) spectrum and a broad band (1.8-86 MHz) spectrum that are exploited by current technology. In this paper, we discuss the usage of these spectra both in LV and MV networks, highlighting pros and cons and advocating the realization of an adaptive technology that can cognitively make the best usage of available resources so that the requirements of reliability, latency and coverage can be met
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