I nternational Journal on “Technical and Physical Problems of Engineering” ( I JTPE) Published by I nternational Organization on TPE (I OTPE) ISSN 2077-3528 I JTPE Journal www.iotpe.com ijtpe@iotpe.com December 2011 I ssue 9 Volume 3 Number 4 Pages 132-136 132 MODELING OF LINE PARAMETERS FOR THE BROADBAND POWER LINE CARRIER CHANNEL M. Rashidi 1 M. Kalantar 2 S. Hosseinzadeh 1 N. Samsunchi 1 A. Kazemi 2 1. Research Group for Processing and Communication, Azarbaijan University of Tarbiat Moallem, Tabriz, Iran mehdi.rashidi@yahoo.com, s.hosseinzadeh@azaruniv.edu, samsunchi@azaruniv.edu 2. Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran kalantar@iust.ac.ir, kazemi@iust.ac.ir Abstract- High speed data over power line seems as unique solution for the sparsely populated areas. Several research and field experiments have been done to investigate the feasibility of this communication channel. The aim of this article is to simulate the high speed data communication via power cables. The effect of physical properties of power line on data communication is investigated. The research steps are mathematical and physical analysis and programming. The effects of line material, line diameter, line elevation, line span and termination on spectral response of channel for various frequencies are investigated. It is seen that copper as line material, thick wires, short towers, line with the least span and resistive-inductive loads shows the maximum voltage amplitude at the load. Keywords: Data Communication, Power Line Carrier, Broad Band Power Line Communication. I. INTRODUCTION During the last decades, trends to broad band communication systems enforce the networks operators to install new communication channels from data providers to the consumers at the last mile. The key technical issue that prevents the operator is the cost of channel installation, especially for the sparsely populated areas. Fiber optic is the ideal communication channel for the broadband data communication. Its high capacity, immunity against the electromagnetic interference, made it the first choice for the network planner. However due to installation cost, it is expensive for the sparsely populated areas. Wireless communication systems; do not require any material as its transmission channel. Only with installation of transmitter and receivers, a broadband data communication network can be constructed. Wireless local loops (WLL), Local Multipoint Distribution Systems(LMDS) and Multipoint-Multipoint Distribution Systems (MMDS) are some examples of wireless systems that can be installed for broad band data communication. There are many data security and wave propagation issues that limits the usage of these technologies. Recently data provisions from digital broadcast networks are considered. These networks require suitable return channel that prevents their growth. In the recent years broad band data communication via power cable is considered for the providing data to sparsely populated areas. The history of this type of data communication comes back to 1920s, when low rate operation and control data for power network operators have been put into the power cable. With the advances in communication theory (modern modulation and coding schemes) and microelectronic industries (i.e. integrated circuit technologies that provide high computation speed), researchers have focused on the high bit rate data over power line. A broadband power line communication system is considered for communication of operation and control data in small grids. Several standards are provided in this regard. BPLC can be used for traffic light control and automatic metering systems [1-11]. Data rendering by power transmission cables PLC is suitable solution for reducing of providing price for high speed data communication. The power transmission cable penetration rate is more than communicational cables and wiring for services initiation is unnecessary. Generally PLCs are divided to two, narrow band and widths band. Already power transmission cable has been used as transmission environment for transmitting of data with low rate. The used frequency band in this system is bound to 125 KHz and the simple modulations schemes like the ASK, PSK, FSK are used for transmitting of data in this systems. The Broad Band Power Line Communication systems provide more data rate than past PLC system. This fact is achievable by using of larger frequency band and more complex modulations. In order to achieve the Broad Band Power Line Communication signals through distribution transformers, there is need for equipments to bypath high frequency signals. Linear (due to eddy current and hysteresis) and nonlinear characteristics of distribution transformers prevents the high frequency signals. One of major problems using of this technology is that used external electrical lines are not protected and unprotected high frequency may interfere other wireless signal in.