ELEC 5110/6110 Homework 2 Solution
Problem # 2.5
What is the average call holding time in seconds of a group of circuits that has accumulated 0.4445 Erlangs
of usage in an hour on 330 call attempts wi
Chapter 19
Problem # 5
The hopping rate of 1600 hops per second is used in the Bluetooth that carries 240
bits in one slot packet. If each frame of the HV2 voice packet carries 160 bits of
sample spee
Chapter 9
Problem1
A digital signaling system is required to operate at 9.6 kbps. If a signal element encodes a 4-bit word,
what is the minimum bandwidth of the channel?
Solution:
R = 2Bw log2M
M = 24
Chapter 11
Problem 8:
Determine (S/N)o for a spread spectrum system having bandwidth, Bw = 1.2288 MHz,
information rate, R = 9.6 kb/s and (S/N)i = 15 dB. Relate your result to Eb / N0.
Solution:
Gp =
Q1. Prove that for a hexagonal geometry, the co-channel reuse ratio is given by
Q = 3N , where N = i 2 + ij + j 2 . Hint : Use the cosine law and the hexagonal
cell geometry.
Q2. A cellular service pr
Chapter 17
Problem # 3
A GSM serving 100,000 subscribers in an urban area is to be replaced by a WCDMA
network. In the GSM network each subscriber generate 0.01 Erlangs voice traffic during
busy-hour.
Chapter 8
Problem 10:
Calculate the output of the convolution encoder shown in Fig. 8.8, if the input is 1 0 1 0 0 1 1 (first bit).
g
Rate (r) = 1/2
Constraint length K = 9
X
1
X
2
X
3
c
0
X
4
X
5
X
6
Chapter 6
Problem # 1
In a proposed TDMA cellular system, the one-way bandwidth of the system is 40
MHz. The channels spacing is 30 kHz and total voice channels in the system are
1333. The frame durat
Chapter 10
Problem 4
In Example 10.1, calculate the SNR ratio when a frequency of 6 GHz is used for the system. At this
frequency use 10 dB for the receiver noise figure.
Solution
= (3 x 108) / (6 x1
Chapter 21
Problem # 10
In the HIPERLAN/2 PHY layer 64-subchannels implementation is used. 48
subcarriers are used to information transmission, 4 subcarriers for pilot tones used
for synchronization,
Chapter 14
Problem # 1
Which two addresses are used in an IP address?
netid and hosted
Problem # 2
What are the maximum number of class A, B, and C network IDs?
Class A: 27 2 = 126
Class B: 214 2 =
ELEC 5110/6110 Wireless Networks
Homework 1
Due time: 3:30 PM, Thursday, 02/02/2017
Problem 1. Define the following parameters for a switching network:
N = number of hops between two given end systems
ELEC 5110/6110 Wireless Networks
Quiz 1
Name
Question 1. List 2 advantages of wireless technologies compared to wired technologies (each in a
couple of words):
Answer: Convenience; deployed faster tha
ELEC 5110/6110 WIRELESS NETWORKS
Lecture 10
Wireless Ad Hoc Networks
Dr. Yihan Li
Dept. of Electrical & Computer Engineering
Auburn University
1
Network Architecture
Infrastructure mode
Ad hoc mode
M
ELEC 5110/6110 WIRELESS NETWORKS
Lecture 11
Bluetooth and IEEE 802.15
(Chapter 15 in the textbook, only materials covered in
the slides are required)
Dr. Yihan Li
Dept. of Electrical & Computer Engine
ELEC 5110/6110 Homework 1 Solution
3.1(a) Circuit Switching
T
=
C1
=
C1 + C2 where
Call Setup Time
C2
=
Message Delivery Time
C1
=
S = 0.2
C2
=
Propagation Delay + Transmission Time
T
=
=
=
N D + L/B
ELEC 5110/6110 Homework 6 Solution
Problem 1
12.3
Home address, care-of address, lifetime.
Problem 2
12.4
Home address, home agent address, MAC address, lifetime.
Problem 3
See Slides 10~16.
Problem 4
ELEC 5110/6110 Homework 5 Solution
8.20
b.
c.
a.
8.22 a. Because only one frame can be sent at a time, and transmission must stop until an
acknowledgment is received, there is little effect in increas
ELEC 5110/6110 WIRELESS NETWORKS
Lecture 9
Wireless LAN and IEEE 802.11
(Sections 13.1, 14.1, 14.2 & 14.3 in the textbook)
Dr. Yihan Li
Dept. of Electrical & Computer Engineering
Auburn University
1
L
Chapter 4
Problem # 4
A digital signaling system is required to operate at 9.6 kbps. If a signal element encodes
4-bit word, what is the minimum bandwidth of the channel?
Solution # 4
(a) R = 9.6 kbps