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Wireless Technology > Wireless Data Transmission > Flashcards

Wireless Data Transmission Flashcards

(62 cards)

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1
Q

American Standard Code for Information Interchange (ASCII)

A

Arbitrary coding scheme that uses the numbers from 0 to 127 to represent alphanumeric characters and symbols

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2
Q

Amplitude

A

Height of a carrier wave

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3
Q

Amplitude Modulation (AM)

A

Changes height of a carrier wave in response to a change in height of input signal

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4
Q

Amplitude Shift Keying (ASK)

A

Digital modulation technique where a 1 bit is shown by the existence of a carrier signal while 0 bit is represented by absence of a carrier signal

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5
Q

Analog Modulation

A

Encoding an analog signal onto a carrier wave

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6
Q

Analog Signal

A

Signal in which the intensity (amplitude or voltage) varies continuously over a period of time

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7
Q

Antenna

A

Send and receive radio signals

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8
Q

Bandwidth

A

Range of frequencies that can be transmitted

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9
Q

Barker code (chipping code)

A

Bit pattern in a DSSS transmission

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10
Q

Baud

A

Change in a carrier signal

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11
Q

Baud rate

A

Times that a carrier signal changes per second

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12
Q

Binary Phase Shift Keying (BPSK)

A

Digital modulation that uses 4 phase changes to represent 2 bits per signal change

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13
Q

Bits per second (bps)

A

Number of bits that can be transmitted per second. Digital data

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14
Q

Carrier Wave

A

Analog wave having a frequency that a receiver is tuned to. Some kind of data encoded into it

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15
Q

Constellation diagram

A

Visualize signals using complex modulation techniques

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16
Q

Continuous wave (CW)

A

Analog or sine waves that is modulated to carrier information.
Becomes a carrier wave

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17
Q

Cycle

A

Oscillating sine wave that completes one full series of movements

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18
Q

Detector

A

Diode that receives a light-based signal

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19
Q

Dibit

A

Signal unit that = 2

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20
Q

Diffused transmission

A

Light-based transmission that relies on reflected light

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21
Q

Digital modulation

A

Encoding a digital signal onto a analog carrier wave

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22
Q

Digital signal

A

Data that is discrete or separate

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23
Q

Direct Sequence Spread Spectrum (DSSS)

A

Expanded, redundant code to transmit each data bit

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24
Q

Directed Transmission

A

Light-based transmission that needs the emitter and detector aimed at each other

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25
Electromagnetic (EM) wave
Signal by electrical and magnetic forces that in radio transmission usually from antenna
26
Emitter
Laser diode or light diode that transmit a light-based signal
27
Forward error correction (FEC)
Corrects bits by sending extra bits that calculate which bit was lost or changed in transmission so receiving equipment can correct error
28
Frequency
Radio waves that is determined by how frequent a cycle happens
29
Frequency Hopping Spread Spectrum (FHSS)
Range of frequencies and changes frequencies during transmission
30
Frequency Modulation (FM)
Changes the number of cycles in response to a change in the amplitude of input
31
Frequency Shift Keying (FSK)
Digital modulation that changes frequency of carrier signal due to change in binary input
32
Gigahertz (GHz)
1 billion hertz
33
Hertz (Hz)
Number of cycles per second
34
Hopping code
Sequence of changing frequencies used in FHSS
35
Infrared light
Light next to visible light on light spectrum Needs emitter and receiver Sends based on intensity
36
Kilohertz (KHz)
1,000 hertz
37
Light spectrum
Types of lights that travel from sun to earth
38
Line of sight
Direct alignment needed from direct transmission
39
Megahertz (MHz)
1 million hertz
40
Modem
Convert digital signals into an analog format, vice versa
41
Modulation
Process of changing a carrier signal
42
Narrow-band transmission
One radio frequency or narrow portion of frequency
43
Non-return-to-zero (NRZ)
Binary signaling that increases voltage to represent 1 bit but no voltage for 0 bit
44
Non-return-to-zero, invert-on-ones (NRZ-I)
Binary signal technique that changes the voltage level when bit is 1, variation of NRZ-L
45
Non-return-to-zero-level (NRZ-L)
Polar NRZ
46
Oscillating signal
Wave that change in a carrier signal
47
Phase
Relative starting point of wave Degrees
48
Phase Modulation (PM)
Changes starting point of wave cycle to a change in the amplitude of input
49
Phase Shift Keying (PSK)
Digital modulation, changes starting point of wave cycle from binary input
50
Polar non-return-to-zero (polar NRZ)
Binary signaling Increases voltage to = 1 bit Negative voltage to = 0 bit
51
Pseudo-random code
Derived through a number of mathematical calculations and practical experimentation
52
Quadbit
Signal representing 4 bits
53
Quadrature Amplitude Modulation (QAM)
Combo of phase modulation w amplitude modulation to produce 16 different signals
54
Quadrature phase shifting keying (QPSK)
Digital modulation Combo amplitude and Quadrature amplitude modulation w phase shift keying
55
Radio wave (radiotelephony)
Electromagnetic wave Invisible Can pass through objects expect metallic ones most common
56
Return-to-zero (RZ)
Binary signaling Increase voltage to = 1 bit Reduced to 0 before end of transmission the 1 bit No voltage for 0 bit
57
Sine wave
Change in a carrier signal
58
Spread spectrum transmission
Narrow signal and spreads over a broader part of radio frequency band
59
Tribit
Signal unit that = 3 bits
60
Unicode
International encoding standard. Different languages
61
Voltage
Electrical pressure
62
Wavelength
Length between 2 positive or negative peaks. One starting point of one wave to the next

Wireless Technology (2 decks)

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