Chapter 10

Question 1

Carrier Signal (wave)

Answer 1

• sine wave
• propagates (travels) well over long distances
• properties: amplitude, frequency, phase shift

Question 2

T or F: square signals deteriorates very fast

Answer 2

true

Question 3

Modulate

Answer 3

modify the properties of a sine wave to encode digital signals

Question 4

modulator

Answer 4

takes in bit stream for transmission and modulates the carrier

Question 5

demodulator

Answer 5

receives the modulated carrier and recovers the bit stream

Question 6

modem

Answer 6

single device that includes a modulator and demodulator for sending and receiving transmissions

Question 7

modulation

Answer 7

encoding analog signal into the carrier

Question 8

shift keying

Answer 8

encoding digital signal into the carrier

Question 9

Phase-Shift Keying

Answer 9

a finite number of phases are used

Question 10

Frequency-Shift Keying

Answer 10

finite number of frequencies are used

Question 11

Amplitude-Shift Keying

Answer 11

number of amplitudes are used

Question 12

Quadrature Amplitude Modulation

Answer 12

finite number of at least two phases and at least two amplitudes; it is a combination of PSK and ASK

Question 13

PASK

Answer 13

Considered a supercalss of QAM. All QAM schemes are PASK scemes, but some PASK modulation schemes have either all real or all imaginary symbols and therefore have either only an in-phase component or just a quadrature component that can represent the whole alphabet