Question

Attenuation of a signal is ?

Answer 1

Hint:Any signal is determined by a few parameters like amplitude, frequency, power, velocity etc. The strength of the signal mainly depends on the amplitude of the signal. Attenuation is related to the strength of a signal.

Complete answer:
Communication takes place in two forms, analog and digital. There is a source that transmits a signal, there is a transmitting medium that connects the source to a receiver and at the end, there is a receiver to receive the signal. Depending on the type of signal, the transmitting medium consists of different items such as antennas, wires, optical fibers, satellites, space, and surrounding environments.

Any signal is determined by a few parameters like amplitude, frequency, power etc. The strength of the signal mainly depends on the amplitude of the signal. Attenuation means the loss of signal strength. It is measured in decibels (dB) or voltage. As signal attenuation increases, full signal transmission decreases.

Attenuation of a signal can also be given by the following formula:
\[\text{Attenuation(dB)} =10\times \log ({{P}_{{{1}_{{}}}}}/{{P}_{0}})\]
where \[{{P}_{{{1}_{{}}}}}\] is input power and \[{{P}_{0}}\] is output power.

Attenuation happens due to the following reasons:
-Losses in transmission mediums such as cables, wires etc.
-More the frequencies within a particular space, the more noise there is, which can further attenuate and hamper the signal’s strength.
-Physical surroundings can also hamper a signal's strength.
-The more the distance between source and receiver, the more is the attenuation. Because long-distance is vulnerable to more noise and losses.

Attenuation can be prevented by following methods:
-Increasing the power of the signal at the source.
-Good maintenance of transmission medium, like cables, antennas, satellites etc.
-Shortening of distance or by adding repeaters and amplifiers in the path of signal transmission.

Note: Fiber optical cables have very little attenuation because the high-frequency optical signals are resistant to the noise until they are transformed into electronic signals after modulation or demodulation.