Exercise 6.5 Power Line Carrier Power line carrier channels suffer from multipat

Question

Exercise 6.5 Power Line Carrier Power line carrier channels suffer from multipath effects similar to that of wireless communication. Differences in impedance will reflect a power line carrier signal back to the source, degrading the original signal. From Philipps (1999), an approximate equation for the power line carrier channel transfer function is derived thus: il There are N Dirac pulses representing the superposition of reflections from N paths. p, is a complex factor delayed by time T. This represents the product of reflection and transmission along each echo path 1. Based upon the above model, what happens as the frequency increases? 2. What happens as the number of reflected pulses increases? 3. What does this imply regarding potential impedance mismatches and the topology of a power line carrier network?

Explanation / Answer

3. This is the impulse noise. This reduces Signal to noise ratio of PLCC. When a reflections impose on transmission line then a Standing wave pattern is created which degrades the signal quality which is attenuation depends on length of line. The source impedance should be matched with the load impedance and characteristic impedance for proper transmission of signal from source to destination. 1. The typical frequencies used in Power line carrier is 30 to 500KHz depending on application. The noise on the power line decreases but attenuation of the signal increases. So both factors to be considered . 2. As a reflected pulses increases interference of the signal is more and echo is larger and Standing waves are created which superimpose on transmitting signal and degrade the signal .

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