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Mobile Database Systems

Vijay Kumar

Chapter 2

Wireless Network Communication - all with Video Answers

Educators

Chapter Questions

02:06

Problem 1

What is channel interference and how does it arise? How can you deal with the adjacent channel interference and cochannel interference? Explain your answer.

Mayukh Banik
Mayukh Banik
Numerade Educator
00:49

Problem 2

In real life the actual radio coverage area is called footprint, which is highly amorphous. In theory, however, a well-defined regular shape is used to identify the necessary parameter for mobility. Explain why such regular shape is necessary and how does it help to define coverage areas.

Rebecca Wilharm
Rebecca Wilharm
Numerade Educator
02:49

Problem 3

Define the following terms (a) spectrum, (b) band, (c) frequency, (d) downlink and uplink channels, and (e) frequency reuse. Establish a working relationship among them.

Keenan Mintz
Keenan Mintz
University of Miami
01:04

Problem 4

A cell size defines the reach of a wireless channel. The strength of a channel depends on the power of its base station. First explain clearly the relationship among a base station, its cell size and its channel strength and develop a rule-ofthumb which can quantify the value a parameter (channel strength, base station power, or cell size) if the values of the other two parameters are given. (Hint: Assume the power of a base station and proceed to define the cell size.)

Raj Bala
Raj Bala
Numerade Educator
11:13

Problem 5

Experiment with difference size cell clusters and discover why some cluster sizes are used more commonly than other sizes. In your investigation explain the advantages and disadvantages of different cell sizes.Derive the relationship $D=R \sqrt{3 N}$, where $D$ is frequency reuse distance, $R$ is the cell radius, and $N$ is cell cluster size (number of cells in a cluster).

Jake Rempel
Jake Rempel
Numerade Educator
03:24

Problem 6

Create different size clusters with different $R$ and find the frequency reuse distance for each sample.

Adriano Chikande
Adriano Chikande
Numerade Educator
04:26

Problem 7

Prove hat $N=i^2+i j+j^2$, where $N$ is the cell cluster size, $i$ is the number of cells to be traversed in $i$ coordinate, $j$ is the number of cells to be traversed in $j$ coordinate from the originating cell. $j$ coordinate is $60^{\circ}$ from $i$ coordinate.

Lucas Finney
Lucas Finney
Numerade Educator

Problem 8

Explain the difference between the structure and functionality of PCS and GSM.

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