Intro-ALT

Question 1

Amplitude

Answer 1

The vertical distance between a peak or a valley and the equilibrium point.

Question 2

Period

Answer 2

The reciprocal of frequency. It is the time difference between two peaks of a periodic signal.

Question 3

Phase Shift

Answer 3

The position of a point in time (an instant) on a waveform cycle.

Question 4

Alias

Answer 4

Other signals that may have same resulting sampled signals.

Question 5

Angular Frequency

Answer 5

Measures angular displacement per unit time.

Question 6

Quantization Levels

Answer 6

Discrete values on y-axis. It is usually evenly spaced.

Question 7

Bandwidth

Answer 7

The difference between the highest frequency component and the lowest frequency component of a signal.

Question 8

Modulation

Answer 8

The process of incorporating a message signal into another signal which is fit to carry a transmission.

Question 9

Signal

Answer 9

A mathematical function that conveys information about the behaviour or attributes of some phenomenon.

Question 10

Waves

Answer 10

Can be loosely described as phenomenon with a periodic vibration.

Question 11

Samples

Answer 11

Instantaneous value of the analog signal at a given time.

Question 12

Modulating Signal (Baseband)

Answer 12

The message signal. It serves as the envelope of the carrier signal.

Question 13

Modulated Signal (RF band)

Answer 13

The resulting signal.

Question 14

Carrier Signal (Pass band)

Answer 14

The “other signal”.

Question 15

Baud Rate

Answer 15

The symbol/signalling rate.

Question 16

Bit Rate

Answer 16

Is generally higher than baud rate on higher order modulation.

Question 17

Power

Answer 17

The amount of energy that is transferred, expanded or transformed per unit time.

Question 18

Desired signal

Answer 18

Any signal that has been transmitted and that we desire to receive.

Question 19

Noise signal

Answer 19

Represents noise, a natural occurring physical phenomenon.

Question 20

SNR (Signal to Noise Ratio)

Answer 20

The ratio of the signal power, to the noise power.

Question 21

RF (Radio frequency)

Answer 21

The frequency band of the electromagnetic spectrum suitable for conventional wireless communication.

Question 22

Tx

Answer 22

Transmit, transmitter.

Question 23

Rx

Answer 23

Receive, receiver.

Question 24

Uplink

Answer 24

Data transfer from UE to eNodeB.

UE - transmitting
eNodeB - receiving

Question 25

Downlink

Answer 25

Data transfer from eNodeB to UE.

UE - receiving
eNodeB - transmitting

Question 26

Simplex

Answer 26

One way communication system.

Question 27

Half-duplex

Answer 27

Two way communication system. Entities can both transmit and receive, but only once at a time.

Question 28

Full-duplex

Answer 28

Two way communication system. Entities can both transmit and receive at the same time.

Question 29

Multiple Access Methods

Answer 29

Techniques employed in a point-to-multipoint communication system in order for the central point to serve the multiple nodes simultaneously.

Question 30

Multiplexing Methods

Answer 30

Techniques employed in order to separate Tx/Rx signals or uplink/downlink signals.

Question 31

TDD (Time division duplexing)

Answer 31

Uses different time slots to separate Tx/Rx.

Question 32

FDD (Frequency division duplexing)

Answer 32

Uses different frequency bands to separate Tx/Rx.

Question 33

TDMA (Time division multiple access)

Answer 33

Each node is allocated a different time slot.

Question 34

FDMA (Frequency division multiple access)

Answer 34

Each node is allocated a different frequency band.

Question 35

CDMA (Code division multiple access)

Answer 35

Transmission is done in a single channel, but each node is allocated a code (key) from which it can decrypt what part if transmission is for itself.