# Analysis of Video Transmission Capabilities in a Simulated OFDM-Based Supplementary BPL-PLC System
## 1 Introduction
This of course depends on many parameters affecting the signal, including: type of cable/line, presence of cable  
Figure 1: Different types of couplers connected to a physical MV cable: (**a**) Capacitive coupler; (**b**) Inductive coupler. box, busbars, type of couplings, etc. However, these distances can be extended by using the well-known repeaters, installed in convenient locations. They are designed to receive the signal from the transmitter, amplify it and forward it further. The leading companies producing transmitting/receiving devices for the BPL-PLC technology utilize solutions that enable the implementation of transmission in one of three hardware configurations:  
* With time access, using time division duplex (TDD), as shown in Figure 2;
* With frequency access, using frequency division duplex (FDD), as shown in Figure 3;
* In a combined access configuration, using both TDD and FDD. For a hardware solution with TDD access, the signal is sent from point A to point B at subsequent time intervals (between the transmitter, repeaters, and receiver). Only after receiving a signal at the destination point (that is point B), the transmitter can send a new data packet. However, in case of FDD access, the data transmission time is much shorter, compared to TDD. It is caused by the fact that multiple devices operate simultaneously, thus can transmit and receive information at the same time. Therefore, when a signal is transmitted from point A to the first repeater in the frequency range \(\Delta f_{1}\), in other parts of the network, signals can be transmitted at the same time but only in other frequency ranges. However, what is also concluded in the literature is that the FDD approach requires twice as many modems as in the case of the TDD transmission. As a result, the investment costs can increase significantly. The technical and economic analysis of BPL systems indicates that the optimal solution for an MV wide power electric grid is the use of combined TDD and FDD transmission technology. After a careful and throughout analysis of available literature, including journal papers as well as conference proceedings, we did not encounter any previous works that would focus on and describe a supplementary video transmission system based on the well-known BPL-PLC wired technology. Therefore, we have initialized joint cooperation in order to contribute to the development of such a system. First, we focus on simulating the parameters of a dedicated physical communication link that would offer stable and reliable communication and exchange of visual content. Figure 3: Data transmission from point A to point B using repeaters (R) in an FDD scenario. Figure 2: Data transmission from point A to point B using repeaters (R) in a TDD scenario. The paper is organized as follows: Section 1 provides an introduction to the topic of research along with a review of available literature. Section 2 presents materials and methods, including the methodology of evaluating different types of coupling and wired media, as well as the designed transmission link along with simulation parameters. Section 3 discussed the procedure of video content processing and ranking by human individuals. Section 4 summarizes this paper and provides further research directions for upcoming studies.