Keyterms

Question 1

Amplitude

Answer 1

The height from the top peak to the bottom peak of a signals waveform; also known as peak-to-peak amplitude.

p15

Question 2

Band

Answer 2

A contiguous range of frequencies.

p10

Question 3

Bandwidth

Answer 3

The range of frequencies used by a single channel or a single RF-signal.

p12

Question 4

Barker 11 Code

Answer 4

An 11-bit sequence of encoded bits that represents a single data bit.

p28

Question 5

Basic Service Area (BSA)

Answer 5

Also known as Cell, the area reached by a singel AccessPoint.

p117

Question 6

Carrier Signal

Answer 6

The basic steady RF signal that is used to carry other useful information.

p24

Question 7

Channel

Answer 7

An arbitrary that points to a specific frequency within a band.

p12

Question 8

Chip

Answer 8

A bit produced by a coder.

p27

Question 9

Coder

Answer 9

A function that converts data bits into multiple encoded bits before transmision to provide resilince againts noise and interference.

p27

Question 10

Complementary Code Keying (CCK)

Answer 10

An encoding method that takes either 4 or 8 data bits at a time to create a 6 or 8 bit symbol respectively. THe symbals are fed into DQPSK to modulate teh carrier signal.

p29

Question 11

Decibel (dB)

Answer 11

A logorithm function that compares one absolute meassurement to another.

p17

Question 12

Decibel-dipole (dBd)

Answer 12

The gain of an antenna, measured in dB as compared to a simple dipole antenna.

p21

Question 13

Decibel-isotropic (dBi)

Answer 13

The gain of an antenna as compared to an isotropic reference antenna.

p21

Question 14

Decibel-milliwat (dBm)

Answer 14

The power level of a signal in dB as compared to a reference signal power of 1 milliwat.

p20

Question 15

Demodulation

Answer 15

The receivers process of interpreting changes in the carrier signal to recover the original information being sent.

p25

Question 16

Differential Binary Phase Shift Keying (DBPSK)

Answer 16

A modulation method that takes 1 bit of encoded data nad changes the phase of the carrier signal in one of two ways.

p28

Question 17

Differentials Quadrature Phase Keying (DQPSK)

Answer 17

A modulation method that takes 2 bit of encoded data nad changes the phase of the carrier signal in one of four ways.

p28

Question 18

Direct Sequence Spread Spectrum (DSSS)

Answer 18

A wireless LAN method where a transmitter uses a sinle fixed, wide channel to send data.

p27