Question

Frequency spectrum is divided into smaller spectra and is allocated to each user

Answer 1

Hey. Here is your answer.

It is done in FDMA (frequency division multiple access)system.
FDMA gives users an individual allocation of one or several frequency bands, or channels. 

Thanks.

Answer 2

Answer:

Spectra is the set of colors into which a beam of light can be separated from a spectral light while spectrum is the plural of spectra.

Explanation:

Access methods are multiplexing techniques that provide communications services to multiple users in a single-bandwidth wired or wireless medium. Communications channels, whether they're wireless spectrum segments or cable connections, are expensive.

• There are five basic access or multiplexing methods: Frequency Division Multiple Access (FDMA),

o Time Division Multiple Access (TDMA),

。 Code Division Multiple Access (CDMA),

Orthogonal Frequency Division Multiple Access

• Spatial Division Multiple Access (SDMA)

Frequency Division Multiple Access (FDMA):

• FDMA is the process of dividing one channel or bandwidth into multiple individual bands, each for use by a single user.

• Each individual band or channel is wide enough to accommodate the signal spectra of the transmissions to be propagated.

Time Division Multiple Access (TDMA):

• TDMA is a digital technique that divides a single channel or band into time slots.

• Each time slot is used to transmit one byte or another digital segment of each signal in sequential serial data format.

Code Division Multiple Access (CDMA):

• CDMA is another pure digital technique. It is also known as spread spectrum because it takes the digitized version of an analog signal and spreads it out over a wider bandwidth at a lower power level.

• This method is called direct sequence spread spectrum (DSSS)

Frequency spectrum is divided into smaller spectra and is allocated to each user

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