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Power Line Communication (PLC) is considered one of emerging technologies for the Next Generation Aircraft. Power lines can be used as an internal data exchange media within aircraft subsystems, such as the Electric Power Distribution System (EPDS). PLC is a term which describes the use of existing electrical power lines to provide the medium for a high data speed networks to replace extra cables, thereby reducing the installation cost and net weight in aircraft wiring. This paper reviews different multiple access techniques and advantages/disadvantages of each technique using power line networks as a data communication medium. Power line channels include various types of noise and interference hence there are major challenges when communicating over power lines. A designer must consider the limitations in the power line communication channels such as propagation factor, impedance mismatch, noise and electromagnetic compatibility.

Diagnosis of the ageing wiring systems in aircrafts, automobiles, industries, transportation, etc is essential. A wide variety of techniques are published in the literature claiming effective diagnosis of wire faults. The focus in this paper is limited to the techniques based on reflectometry principle. These are categorized in to Time Domain Reflectometry [TDR], Frequency Domain Reflectometry [FDR], Spread Spectrum Time Domain Reflectometry [SSTDR], Modified Spread Spectrum Time Domain Reflectometry [M-SSTDR], Noise Domain Reflectometry [NDR], Distributed Reflectometry[DR], Multi Carrier Reflectometry [MCR], Filterbank Multi Carrier Reflectometry [FBMCR] and Time Frequency Domain Reflectometry [TFDR]/Joint Time Frequency Domain Reflectometry [JTFDR] techniques. This paper presents a brief description of these techniques along with their comparison with respect to the key parameters and simulation results of Filter Bank Multi Carrier Reflectometry (FBMCR) technique.