SOLUTIONS MANUAL
-1-
,Solutions manual wireless communications and networks 2nd Edition By William
Stallings
TABLE OF CONTENTS
Chapter 2: Transmission Fundamentals...................................................... 5
Chapter 3: Communication Networks......................................................... 8
Chapter 4: Protocols and the TCP/IP Suite................................................ 14
Chapter 5: Antennas and Propagation........................................................ 17
Chapter 6: Signal Encoding Techniques.....................................................22
Chapter 7: Spread Spectrum..................................................................... 28
Chapter 8: Coding and Error Control........................................................ 34
Chapter 9: Satellite Communications........................................................ 44
Chapter 10: Cellular Wireless Networks...................................................... 48
Chapter 11: Cordless Systems and Wireless Local Loop............................... 54
Chapter 12: Mobile IP and Wireless Access Protocol.................................... 56
Chapter 13: Wireless LAN Technology.........................................................59
Chapter 14: Wi-Fi and the IEEE 802.11 Wireless LAN Standard................... 61
Chapter 15: Bluetooth and IEEE 802.15....................................................... 65
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, CHAPTER 2
TRANSMISSION FUNDAMENTALS
ANSWERS TO Q U E S T I O N S
2.1 A continuous or analog signal is one in which the signal intensity varies in a
smooth fashion over time while a discrete or digital signal is one in which the
signal intensity maintains one of a finite number of constant levels for some
period of time and then changes to another constant level.
2.2 Amplitude, frequency, and phase are three important characteristics of a
periodic signal.
2.3 2π radians.
2.4 The relationship is f = v, where is the wavelength, f is the frequency,
and v is the speed at which the signal is traveling.
2.5 The spectrum of a signal consists of the frequencies it contains; the
bandwidth of a signal is the width of the spectrum.
2.6 Attenuation is the gradual weakening of a signal over distance.
2.7 The rate at which data can be transmitted over a given communication
path, or channel, under given conditions, is referred to as the channel
capacity.
2.8 Bandwidth, noise, and error rate affect channel capacity.
2.9 With guided media, the electromagnetic waves are guided along an
enclosed physical path, whereas unguided media provide a means for
transmitting electromagnetic waves through space, air, or water, but
do not guide them.
2.10 Point-to-point microwave transmission has a high data rate and less
attenuation than twisted pair or coaxial cable. It is affected by rainfall,
however, especially above 10 GHz. It is also requires line of sight and is
subject to interference from other microwave transmission, which can be
intense in some places.
2.11 Direct broadcast transmission is a technique in which satellite video
signals are transmitted directly to the home for continuous operation.
2.12 A satellite must use different uplink and downlink frequencies for
continuous operation in order to avoid interference.
-3-
, 2.13 Broadcast is omnidirectional, does not require dish shaped antennas,
and the antennas do not have to be rigidly mounted in precise
alignment.
2.14 Multiplexing is cost-effective because the higher the data rate, the
more cost-effective the transmission facility.
-4-
-1-
,Solutions manual wireless communications and networks 2nd Edition By William
Stallings
TABLE OF CONTENTS
Chapter 2: Transmission Fundamentals...................................................... 5
Chapter 3: Communication Networks......................................................... 8
Chapter 4: Protocols and the TCP/IP Suite................................................ 14
Chapter 5: Antennas and Propagation........................................................ 17
Chapter 6: Signal Encoding Techniques.....................................................22
Chapter 7: Spread Spectrum..................................................................... 28
Chapter 8: Coding and Error Control........................................................ 34
Chapter 9: Satellite Communications........................................................ 44
Chapter 10: Cellular Wireless Networks...................................................... 48
Chapter 11: Cordless Systems and Wireless Local Loop............................... 54
Chapter 12: Mobile IP and Wireless Access Protocol.................................... 56
Chapter 13: Wireless LAN Technology.........................................................59
Chapter 14: Wi-Fi and the IEEE 802.11 Wireless LAN Standard................... 61
Chapter 15: Bluetooth and IEEE 802.15....................................................... 65
-2-
, CHAPTER 2
TRANSMISSION FUNDAMENTALS
ANSWERS TO Q U E S T I O N S
2.1 A continuous or analog signal is one in which the signal intensity varies in a
smooth fashion over time while a discrete or digital signal is one in which the
signal intensity maintains one of a finite number of constant levels for some
period of time and then changes to another constant level.
2.2 Amplitude, frequency, and phase are three important characteristics of a
periodic signal.
2.3 2π radians.
2.4 The relationship is f = v, where is the wavelength, f is the frequency,
and v is the speed at which the signal is traveling.
2.5 The spectrum of a signal consists of the frequencies it contains; the
bandwidth of a signal is the width of the spectrum.
2.6 Attenuation is the gradual weakening of a signal over distance.
2.7 The rate at which data can be transmitted over a given communication
path, or channel, under given conditions, is referred to as the channel
capacity.
2.8 Bandwidth, noise, and error rate affect channel capacity.
2.9 With guided media, the electromagnetic waves are guided along an
enclosed physical path, whereas unguided media provide a means for
transmitting electromagnetic waves through space, air, or water, but
do not guide them.
2.10 Point-to-point microwave transmission has a high data rate and less
attenuation than twisted pair or coaxial cable. It is affected by rainfall,
however, especially above 10 GHz. It is also requires line of sight and is
subject to interference from other microwave transmission, which can be
intense in some places.
2.11 Direct broadcast transmission is a technique in which satellite video
signals are transmitted directly to the home for continuous operation.
2.12 A satellite must use different uplink and downlink frequencies for
continuous operation in order to avoid interference.
-3-
, 2.13 Broadcast is omnidirectional, does not require dish shaped antennas,
and the antennas do not have to be rigidly mounted in precise
alignment.
2.14 Multiplexing is cost-effective because the higher the data rate, the
more cost-effective the transmission facility.
-4-
