MOBCOMP LECTURE one particular

 MOBCOMP SPIEL 1 Composition

MOBILE COMPUTING

Chapter one particular: Outline

 1 . you Introduction to Mobile Computing

 1 . 2 A radio station Propagation

 1 . 3 Antennas

 1 . some Cellular Systems

 1 . 5 Cellular Link Attributes

ERIC SAVIOUR ARYEE OKAI OCT, 2013

MOBILE COMPUTING

1 ) 1 INTRODUCTION

 Precisely what is Mobile Computing?

 Mobile Computing is actually a technology that

allows transmitting of data, tone of voice and video

via a laptop or any additional wireless

enabled device without needing to be

linked to a fixed physical link.

ERIC SAVIOUR ARYEE OKAI OCT, 2013

Why Proceed Mobile?

• Enable anywhere/anytime connectivity

• Bring computer system communications to

areas with out pre-existing infrastructure

• Enable mobility

• Enable fresh applications

• An exciting new research location

ERIC SAVIOUR ARYEE OKAI,

OCT, 2013

Comparison to Wired Net.

• Wired

Networks

• Mobile

Sites

-

-- low bandwidth

- concealed terminal

issue

- low power devices

- low resource

devices

- require proximity

- higher postpone

- disconnected

operation

high bandwidth

can listen upon wire

large power machines

high resource

machines

-- need physical

access(security)

-- low postpone

- linked operation

JOSHUA SAVIOUR ARYEE OKAI,

OCT, 2013

WI-FI TRANSMISSION

1 ) 2 A RADIO STATION PROPAGATION: Car radio

propagation is the behavior of radio surf

when they are transmitted, or propagated

from one point on the Globe to another, or perhaps

into some part of the atmosphere.

 As a form of electromagnetic radiation, just like

light dunes, radio waves are affected by the

phenomena of reflection, dispersion, and

spreading.

JOSHUA SAVIOUR ARYEE OKAI,

MARCH, 2013

PROJECT #1

With the aid of simple diagram(s), describe

the three distribution phenomena.

ERIC SAVIOUR ARYEE OKAI,

MARCH, 2013

A radio station Propagation Cont'd

Car radio propagation is usually affected by

other factors dependant upon its way

from point out point. This kind of path can be quite a

direct line of sight way or a great over-thehorizon route aided simply by refraction inside the ionosphere, which is a region between

approximately 60 and 600 km.[

ERIC SAVIOUR ARYEE OKAI,

APRIL, 2013

1 . 2 . one particular The Ionospheric

layers

ERIC SAVIOUR ARYEE OKAI,

APRIL,

2013

1 . 2 . one particular The Ionosphere

It is a region in the globe's atmosphere that

has a substantial concentration of ions and free

electrons and stretches from regarding 50 kilometers to

more than 1000 kilometers in hohe.

 The ionosphere disturbs the propagation of

radiowaves through it by showing and

attenuating them.

ERIC SAVIOUR ARYEE OKAI,

OCT,

2013

The Ionosphere Cont'd

It can do however enable long distance radio

tranny at eq up to regarding 30

megahertz by effective reflections

among it and points within the earth's

surface.

 The ionosphere contains several specific

layers or perhaps regions that may change in

fullness between night and day and also

demonstrate seasonal and latitude versions.

JOSHUA SAVIOUR ARYEE OKAI,

OCT, 2013

1 ) 2 . two Ionospheric Tiers

The D-Layer, extending coming from about sixty - ninety

km, includes a relatively low concentration of

electrons and reflects low-frequency

radiowaves.

 The E-Layer extends from about 85 to one hundred twenty

km, includes a higher attentiveness of electrons

than the D-Layer, and reflects mediumfrequency radiowaves.

RICHARD SAVIOUR ARYEE OKAI,

OCT, 2013

Ionospheric Layers Cont'd

The greatest layers would be the F1-Layer, which can be

a day time feature dedicated to about 150

km, as well as the F2-Layer, which is centered on

regarding 300 kilometers. These levels contain the

maximum concentration of free electrons and

reflects high frequency radiowaves.

ERIC SAVIOUR ARYEE OKAI,

OCT, 2013

Ionospheric Tiers Cont'd

At nighttime the D- and E-layers become

fairly inactive because there is no solar

light to make ion pairs lost simply by

recombination. The F-Layers have got a lower

denseness and hence a reduced recombination

level of ions.

 The F -Layer can be used intended for radio

2

transmission constantly. It is the many

useful region for...


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