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In this paper the process of spectrum assignment in narrowband power line communication is studied. Due to the frequency-selective and time-variant nature of the PLC channel, spectrum assignment must be performed dynamically throughout the transmission. This requires constant channel state information at the PLC transmitter which in turn increases undesired overhead in the system and degrades throughput...
The high pressure sodium lamp is a high energy outdoor light source that belongs to the high intensity discharge lamp family. It comes in different shapes and requires a ballast to start it. The high pressure sodium lamp is a source of interference to the power line communications channel as it injects noise when connected to the 220V mains. This paper investigates the influence of the high pressure...
The power-line communications channel (PLC) is one of the harsh and challenging channels due to heavy load and noise impairments. Sending and/or receiving of data bits over the PLC channel can be easily affected; therefore, several investigations have been conducted to illustrate interference effects over PLC where intermittent noise plays a major role in this type of communications channel. The in-building...
In this paper, we analyze the capacity of a multiple input multiple output (MIMO) channel with impulsive noise interference. The Middleton class A model of electromagnetic interference has been employed to model the power line communication (PLC) channel. PLC can utilize MIMO to increase data rate and performance gain. However, an expression for the channel capacity of MIMO power line channel with...
The fluorescent lamps or fluorescent tubes are low pressure mercury-vapor gas-discharge lamps that use fluorescence to produce visible light. These lamps inject noise into the power-line communications channel. This can have a detrimental effect on the power-line communication system. In this paper we investigate the effects when the fluorescent lamps with electronic ballasts are seen as noise sources...
LED (Light Emitting Diode) lamps have recently come on to the market as energy efficient alternatives to incandescent light bulbs. Although energy effective, they inject conductive noise into the power-line system. This can have a detrimental effect on the power-line communications channel. This paper investigates these effects when LED lamps are seen as noise sources on the power line. It shows that...
A number of measurements show the results of the harmonics and conducted emissions from “Energy-Savings” Compact Fluorescent Lamps (CFL) when connected to the power-line communications channel. Different CFL's from different manufacturers were investigated. The paper covers the CENELEC band, as well as the broadband communications channel: 150kHz–30MHz. The obtained results show the levels of harmonics...
The powerline channel is considered as a challenging channel due to the heavy load and noise impairments. In this paper we investigate an important type of measurement with regards to the powerline communications channel, where the low voltage wiring inside a house is considered as a receiving antenna for interference. Several types of measurements are presented using the corresponding broadband PLC...
To realize the auto operation of the remote recharge process of IP telephone and the low-balance add-fund notice of IP account, an IP telephone remote auto-recharge system based on multiagent is developed by the author. This system can effectively implement IP telephone remote auto-recharge and auto-voice playing to notice users to add fund and can lead the related IP telephone service information...
Call admission control (CAC) algorithms that reduce dropped calls in code-division multiple access (CDMA) cellular systems are discussed in this paper. The capacity of a CDMA system is confined by the interference of users from both inside and outside of the target cell. Earlier algorithms for CAC are based on the effective traffic load for the target cell if one call is accepted. These algorithms...
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