Question

a-) Provide information on the multiplication techniques used in communication systems.

b-) Explain the reasons for pluralization and where it is used.

Answer 1

There are three  types of multiplications techniques used in communication systems

1.time division multiplexing

2. Frequency division multiplexing

3. Wave length division multiplexing

1) time division multiplexing is a kind of method for transmitting a signal over a channel of particular communication with separating the time edge into slots. Tdm is mainly used in analog and digital signals in which several channels with low speed are multipexed into high speed channels used for transmission

2) frequency division multiplexing is a networking technique in which multiple data signals are combined for simultaneous transmission via a shared communication medium. Fdm uses a carrier signal at a discrete frequency for each data streem and then combines many modulated signals

3) wavelength division multiplexing is a technique of multiplexing multiple optical carrier signals through a single optical fiber channel by varying the wavelength of laser light. Wdm allows communication in both the directions in the fiber cable

2nd question

Polarization occurs when light is scattered while travelling through a medium.

Polarization is used to differentiate longitudinal and transverse wave

Am and FM radio will use vertical polarization

All radio transmitting and receiving antennas uses polarization