Abstract
Power Line Communication (PLC) is a technology where existing power lines are being used for communication purposes along with transmitting electrical signals. There are two types of PLC communication i.e. Narrowband PLC, which is used for lower frequency ranges from 9 KHz to 140 KHz, and it provides data rates up to 1000 bit per second (bps) and the other type is Broadband PLC, which uses higher frequency ranges from 2 MHz to 30 MHz and it can provide significantly higher data rates i.e. more than 2 Mbps. The data transfer bound on power lines is due to the existing power signals which create Electromagnetic Interference (EMI) with communication signals, and the other factor is non-linearity of the power line itself. Moreover, because of its time-dispersive nature, it creates frequency-selective fading effect which may give rise to Inter-Symbol Interference (ISI). The purpose of this research is to know that how the power lines behave when high frequency signals are transmitted on it, with the help of mathematical modelling and graphs of transmitted signal. In this context, the power-line is approximated as a two-wire transmission line, through which behaviour of the signals transmitted on PLC channel can be analysed. From the mathematical modelling perspective, it has been contributed that the amplitude and phase of transmitted signals are functions of distance and frequency. These signals are more distorted and attenuated with increasing frequency and distance. Finally, with the help of simulation results, it can be demonstrated that PLC performance is better at 30MHz in comparison to 40 MHz. From the simulation results, it can also be observed that as the frequency increases, more the signal is being distorted and attenuated. Therefore signals with higher frequencies have huge losses and phase of the signals remain linear.